1. Womic Steel: Manufacturing Capabilities & Company Strength
Womic Steel Group is a premier manufacturer and global exporter with over 20 years of expertise in producing carbon, alloy, and stainless steel tubular products. Our state-of-the-art ERW pipe production facility spans a comprehensive manufacturing capability exceeding 15,000 tons per month for electric resistance welded steel pipes.
Production Size Range for EN 10219 S355J2H ERW Pipe: Outside diameter from 21.3mm to 610mm (1/2 inch to 24 inch) with wall thickness from 2.0mm to 20.0mm. Available in round, square, and rectangular shapes. Single random lengths of 6m, double random lengths of 12m, or custom lengths as required.
Quality Certifications & Regulatory Compliance:
ISO 9001:2015 Certified: Quality management system ensuring consistent product quality across all operations.
CE Marking (EN 10219): Full compliance with EN 10219 standard for cold-formed welded structural hollow sections. CE marking and Declaration of Performance (DoP) provided for European market acceptance.
EN 10204 3.2 Certification: Inspection Certificate 3.2 validated by TÜV, LR, BV, or SGS for critical projects requiring full traceability.
Third-Party Inspection (TPI) Approvals: Products and processes approved by SGS, BV, ABS, LR, DNV, GL, and TÜV for classification society-regulated offshore and structural projects.
Additional Certifications: ISO 14001, ISO 45001, NORSOK M-650 available upon request.
Customer-Specific Approvals: Regular factory audits for major EPC contractors, construction companies, and engineering firms globally.
Global Recognition: Womic Steel is a trusted supplier to global EPC contractors, construction companies, and engineering firms, serving over 80 countries across Southeast Asia, Europe, the Middle East, Africa, and the Americas.
2. EN 10219 S355J2H ERW Steel Pipe: Material Composition & Performance Characteristics
EN 10219 S355J2H is a cold-formed welded structural hollow section made from non-alloy and fine grain steels. The "S" denotes structural steel, "355" indicates minimum yield strength of 355 MPa, "J2" specifies Charpy impact testing at -20°C (27J minimum), and "H" indicates hollow section.
Compared to lower grades like S235JRH (235 MPa yield) and S275JRH (275 MPa yield), S355J2H offers significantly higher strength while maintaining excellent weldability, formability, and low-temperature toughness. The J2 impact rating makes it suitable for cold climate applications where impact resistance at -20°C is required. This grade is the most widely specified structural hollow section for building construction, bridges, and offshore structures across Europe and international markets.
EN 10219 S355J2H ERW Steel Pipe Chemical Composition (Ladle Analysis, % by mass):
| Element | C max | Si max | Mn max | P max | S max | N max |
| S355J2H | 0.22 | 0.55 | 1.60 | 0.030 | 0.030 | 0.015 |
Note: Fine grain treatment applied (Al ≥ 0.015% or other grain refining elements). Carbon equivalent (CEV) max 0.45% for wall thickness ≤ 40mm, ensuring good weldability for field joining and fabrication.
EN 10219 S355J2H ERW Steel Pipe Mechanical Properties (Room Temperature):
| Wall Thickness (mm) | Yield Strength (min) | Tensile Strength | Elongation (min) |
| t ≤ 16mm | 355 MPa | 470-630 MPa | 20% |
| 16mm < t ≤ 40mm | 345 MPa | 470-630 MPa | 20% |
| 40mm < t ≤ 80mm | 335 MPa | 470-630 MPa | 19% |
Note: Yield strength decreases slightly with increasing wall thickness, a standard characteristic for structural hollow sections. Tensile strength range remains consistent across all thicknesses, ensuring predictable structural performance.
EN 10219 S355J2H ERW Steel Pipe Low-Temperature Impact Properties (Charpy V-Notch):
| Grade | Test Temperature | Average Energy (min) | Individual Energy (min) |
| S355J2H | -20°C | 27 Joules | 20 Joules |
*Note: J2 rating ensures reliable performance in cold environments, making S355J2H suitable for bridges, offshore structures, and building construction in regions with sub-zero temperatures. For lower temperature requirements (-40°C), S355J2H is not applicable; S355ML or S355NL should be considered.*
EN 10219 S355J2H ERW Steel Pipe Carbon Equivalent Limits:
| Wall Thickness | CEV (IIW) Maximum |
| t ≤ 40mm | 0.45% |
| t > 40mm | By agreement |
Note: Low carbon equivalent ensures excellent weldability in field conditions, reducing preheating requirements and installation costs for structural fabrication.
3. EN 10219 S355J2H ERW Steel Pipe Dimensional Range & Standards Compliance
Womic Steel supplies EN 10219 S355J2H ERW pipes across a wide dimensional spectrum, fully compliant with EN 10219-1:2006 and EN 10219-2:2006 standards.
| Item | Specification |
| Standard | EN 10219-1 / EN 10219-2 (Cold formed welded structural hollow sections) |
| Grade | S355J2H (1.0576) |
| Manufacturing Process | Electric Resistance Welding (ERW) / High Frequency Welding (HFW) |
| Shape Options | Round / Square / Rectangular |
| Outside Diameter Range (Round) | 21.3mm – 610mm (1/2 inch – 24 inch) |
| Square Size Range | 20mm x 20mm – 500mm x 500mm |
| Rectangular Size Range | 40mm x 20mm – 600mm x 400mm |
| Wall Thickness Range | 2.0mm – 20.0mm (depending on size and shape) |
| Length | 6m (SR), 12m (DR), or custom lengths up to 18m |
| End Finish | Plain End (PE) / Beveled End (BE) |
| Surface Finish | Bare / Oiled / Black Coated / Primed / Galvanized / Painted |
| Tolerances | OD: ±1.0% / WT: ±10% / Length: +50mm -0mm |
4. Available Dimensions & Specifications - ERW Steel Pipe
|
NB |
Size |
OD mm |
SCH40S mm |
SCH5S mm |
SCH10S mm |
SCH10 mm |
SCH20 mm |
SCH40 mm |
SCH60 mm |
XS/80S mm |
SCH80 mm |
SCH100 mm |
SCH120 mm |
SCH140 mm |
SCH160 mm |
SCHXXS mm |
|
6 |
1/8” |
10.29 |
1.24 |
1.73 |
2.41 |
|||||||||||
|
8 |
1/4” |
13.72 |
1.65 |
2.24 |
3.02 |
|||||||||||
|
10 |
3/8” |
17.15 |
1.65 |
2.31 |
3.20 |
|||||||||||
|
15 |
1/2” |
21.34 |
2.77 |
1.65 |
2.11 |
2.77 |
3.73 |
3.73 |
4.78 |
7.47 |
||||||
|
20 |
3/4” |
26.67 |
2.87 |
1.65 |
2.11 |
2.87 |
3.91 |
3.91 |
5.56 |
7.82 |
||||||
|
25 |
1” |
33.40 |
3.38 |
1.65 |
2.77 |
3.38 |
4.55 |
4.55 |
6.35 |
9.09 |
||||||
|
32 |
1 1/4” |
42.16 |
3.56 |
1.65 |
2.77 |
3.56 |
4.85 |
4.85 |
6.35 |
9.70 |
||||||
|
40 |
1 1/2” |
48.26 |
3.68 |
1.65 |
2.77 |
3.68 |
5.08 |
5.08 |
7.14 |
10.15 |
||||||
|
50 |
2” |
60.33 |
3.91 |
1.65 |
2.77 |
3.91 |
5.54 |
5.54 |
9.74 |
11.07 |
||||||
|
65 |
2 1/2” |
73.03 |
5.16 |
2.11 |
3.05 |
5.16 |
7.01 |
7.01 |
9.53 |
14.02 |
||||||
|
80 |
3” |
88.90 |
5.49 |
2.11 |
3.05 |
5.49 |
7.62 |
7.62 |
11.13 |
15.24 |
||||||
|
90 |
3 1/2” |
101.60 |
5.74 |
2.11 |
3.05 |
5.74 |
8.08 |
8.08 |
||||||||
|
100 |
4” |
114.30 |
6.02 |
2.11 |
3.05 |
6.02 |
8.56 |
8.56 |
11.12 |
13.49 |
17.12 |
|||||
|
125 |
5” |
141.30 |
6.55 |
2.77 |
3.40 |
6.55 |
9.53 |
9.53 |
12.70 |
15.88 |
19.05 |
|||||
|
150 |
6” |
168.27 |
7.11 |
2.77 |
3.40 |
7.11 |
10.97 |
10.97 |
14.27 |
18.26 |
21.95 |
|||||
|
200 |
8” |
219.08 |
8.18 |
2.77 |
3.76 |
6.35 |
8.18 |
10.31 |
12.70 |
12.70 |
15.09 |
19.26 |
20.62 |
23.01 |
22.23 |
|
|
250 |
10” |
273.05 |
9.27 |
3.40 |
4.19 |
6.35 |
9.27 |
12.70 |
12.70 |
15.09 |
19.26 |
21.44 |
25.40 |
28.58 |
25.40 |
|
|
300 |
12” |
323.85 |
9.53 |
3.96 |
4.57 |
6.35 |
10.31 |
14.27 |
12.70 |
17.48 |
21.44 |
25.40 |
28.58 |
33.32 |
25.40 |
|
|
350 |
14” |
355.60 |
9.53 |
3.96 |
4.78 |
6.35 |
7.92 |
11.13 |
15.09 |
12.70 |
19.05 |
23.83 |
27.79 |
31.75 |
35.71 |
|
|
400 |
16” |
406.40 |
9.53 |
4.19 |
4.78 |
6.35 |
7.92 |
12.70 |
16.66 |
12.70 |
21.44 |
26.19 |
30.96 |
36.53 |
40.49 |
|
|
450 |
18” |
457.20 |
9.53 |
4.19 |
4.78 |
6.35 |
7.92 |
14.27 |
19.05 |
12.70 |
23.83 |
29.36 |
34.93 |
39.67 |
45.24 |
|
|
500 |
20” |
508.00 |
9.53 |
4.78 |
5.54 |
6.35 |
9.53 |
15.09 |
20.62 |
12.70 |
26.19 |
32.54 |
38.10 |
44.45 |
50.01 |
|
|
550 |
22” |
558.80 |
9.53 |
4.78 |
5.54 |
6.35 |
9.53 |
22.23 |
12.70 |
28.58 |
34.93 |
41.28 |
47.63 |
53.98 |
||
|
600 |
24” |
609.60 |
9.53 |
5.54 |
6.35 |
6.35 |
9.53 |
17.48 |
24.61 |
12.70 |
30.96 |
38.89 |
46.02 |
52.37 |
59.54 |
|
|
650 |
26” |
660.40 |
9.53 |
7.92 |
12.70 |
12.70 |
Note: Wall thickness availability may vary based on pipe diameter and manufacturing capability. Custom dimensions outside this range available upon request.
5. Common ERW Steel Pipe Standards Manufactured by Womic Steel
|
Standard |
Regular Grades |
Typical Application |
| API 5L (Specification for Line Pipe) | ||
| API 5L PSL1 / PSL2 | GR.B, X42, X52, X60, X65, X70 | Oil and gas transmission, onshore/offshore pipelines |
| ASTM Line Pipe & Structural Pipe | ||
| ASTM A53 (Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless) | GR.A, GR.B | Water, gas, steam, air, structural applications |
| ASTM A135 (Specification for Electric-Resistance-Welded Steel Pipe) | GR.A, GR.B | Water, gas, steam, refinery services |
| ASTM A252 (Specification for Welded and Seamless Steel Pipe Piles) | GR.1, GR.2, GR.3 | Foundation piling, marine piling, bridge foundation |
| ASTM A500 (Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing) | GR.A, GR.B, GR.C | Structural tubing, building frames, bridges |
| ASTM A501 (Specification for Hot-Formed Welded and Seamless Carbon Steel Structural Tubing) | GR.A, GR.B | Heavy structural applications, columns, trusses |
| ASTM Boiler & Heat Exchanger (ERW) | ||
| ASTM A178 (Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler Tubes) | Grade A, C, D | Boiler tubes, superheater tubes |
| ASTM A214 (Specification for Electric-Resistance-Welded Carbon Steel Heat Exchanger and Condenser Tubes) | — | Heat exchangers, condensers |
| ASTM A250 (Specification for Electric-Resistance-Welded Ferritic Alloy Steel Boiler and Superheater Tubes) | T1, T2, T5, T9, T11, T22 | High temperature boiler and superheater |
| ASTM A334 (Specification for Seamless and Welded Carbon and Alloy Steel Tubes for Low-Temperature Service) | GR.1, GR.3, GR.6 | Low temperature service, cryogenic |
| EN / DIN / BS Standards | ||
| EN 10217-1 (Welded steel tubes for pressure purposes - Non-alloy steel tubes with specified room temperature properties) | P235TR1, P265TR1 | Pressure vessels, boiler drums, high pressure piping |
| EN 10217-2 (Welded steel tubes for pressure purposes - Non-alloy and alloy steel tubes with specified elevated temperature properties) | P235GH, P265GH, P295GH, P355GH | Elevated temperature, boiler tubes, heat exchangers |
| EN 10219-1 (Cold-formed welded steel hollow sections for structural purposes) | S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S355K2H | Structural applications, building construction, bridges |
| EN 10210(Hot finished structural hollow sections of non-alloy and fine grain steels) | S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S355K2H S420MH, S460MH | Hot formed seamless/welded hollow sections for structural purposes, building construction, bridges |
| EN 10025-2 (Hot-rolled products of structural steels - Non-alloy structural steels) | S235JR, S275JR, S355JR, | General structural steelwork, civil engineering |
| EN 10255 (Non-alloy steel tubes suitable for welding and threading) | S195T, S235JRTH | Water, gas, sewage, threaded pipe systems |
| EN 10305-2 (Steel tubes for precision applications - Welded cold drawn tubes) | E215, E235, E355 | Precision applications, hydraulic cylinders |
| BS 1387 (Specification for screwed and socketed steel tubes and tubulars) | Class A, B, C | Water, gas, steam, scaffolding, threaded pipe |
| DIN 2458 (Welded steel tubes and fittings - General technical delivery conditions) | St37.0, St44.0, St52.0 | General welded steel tubes, structural applications |
| ISO & Other Standards | ||
| ISO 3183 (Petroleum and natural gas industries - Steel pipe for pipeline transportation systems) | L245, L290, L360, L415 | Oil and gas pipelines (ISO equivalent of API 5L) |
| ISO 65 (Steel tubes for water, gas, and sewage - Threaded tubes) | Medium, Heavy | Water, gas, sewage, threaded pipe |
| CSA G40.21 (Structural quality steel - Canadian standard) | 44W, 50W | Structural applications (Canada) |
| AS 1163 (Structural steel hollow sections - Australian standard) | C250, C350, C450 | Structural hollow sections (Australia) |
| GOST 10706 (Welded steel pipes for pipelines and structures - Russian standard) | St20, St35, St45 | Pipelines, structural applications (Russia) |
Usage: Oil and gas transmission, water and sewage, structural projects, scaffolding, piling foundation, high pressure fluid, chemical processing, power generation, construction, marine engineering, boiler tubes, heat exchangers, superheaters, condensers, low temperature service, precision applications, hydraulic cylinders, threaded pipe systems
6. Manufacturing Process - ERW / HFW Steel Pipe
Raw Material Inspection: Incoming steel coils are verified for chemical composition, mechanical properties, and surface quality. Each coil is assigned a unique heat number for full traceability.
Uncoiling & Leveling: Coils are uncoiled and leveled to flatten the strip and remove coil set, ensuring uniform flatness for consistent forming.
Edge Milling & Trimming: Both edges of the strip are milled to precise width tolerance (±0.5mm), creating a clean, parallel surface for high-quality weld formation.
Cold Forming: The leveled strip passes through forming rolls which gradually shape the flat strip into an open cylindrical tube shell.
High-Frequency Welding (HFW/ERW): High-frequency current (200-500 kHz) heats the mating edges to forging temperature (1,350-1,500°C). Squeeze rolls press the heated edges together, creating a forged weld without filler material.
Weld Bead Removal: Internal and external flash is removed by carbide scarfing blades while hot, producing a smooth surface with minimal weld reinforcement.
Sizing: The welded tube passes through sizing rolls to achieve precise OD tolerance (±0.5% to ±1.0%). Additional rolls produce square/rectangular shapes if required.
Heat Treatment (Optional): Normalizing at 890-930°C may be applied for enhanced ductility or stress relief, producing uniform ferrite-pearlite microstructure.
Cutting to Length: Pipe is cut to specified lengths using flying cut-off saws with precision control (±3mm).
Non-Destructive Testing:
● Ultrasonic Testing (UT): 100% inspection of weld seam and pipe body for laminations, inclusions, and lack of fusion.
● Eddy Current Testing (ET): Continuous on-line weld quality inspection.
● Hydrostatic Testing: Each pipe tested to 95% of SMYS for minimum 10 seconds.
End Finishing: Plain ends, beveled ends (30°-35° with 1.6mm landing), or threaded ends as per customer specification.
Final Inspection & Marking: Visual inspection, dimensional verification (OD, WT, length, straightness), and permanent marking per standard (grade, size, heat number, manufacturer).
7. Quality Control & Testing Procedures
| Stage | Inspection Method | Purpose |
| Raw Material | Chemical Analysis (OES Spectrometer) | Verify compliance with API 5L composition limits |
| Raw Material | Tensile Testing | Verify yield, tensile strength, elongation |
| In-Process | Dimensional Inspection (Micrometers, Calipers) | Monitor OD, WT during forming and sizing |
| Weld Zone | Ultrasonic Testing (UT) - On-Line | Detect weld discontinuities, lack of fusion |
| Weld Zone | Eddy Current Testing (ET) - On-Line | Continuous weld seam quality monitoring |
| Weld Zone | Weld Seam Macro-Examination | Verify weld penetration and fusion geometry |
| Finished Pipe | Hydrostatic Testing (10 sec min at 95% SMYS) | Verify pressure integrity and leak-tightness |
| Finished Pipe | Ultrasonic Testing (UT) - Off-Line (Optional) | Full body laminar inspection |
| Finished Pipe | Magnetic Particle Inspection (MPI) | Surface crack detection (weld and HAZ) |
| Finished Pipe | Charpy V-Notch Impact Test | Verify low-temperature toughness (PSL2) |
| Finished Pipe | Hardness Test (HRC / HV10) | Verify maximum hardness limits (sour service) |
| Finished Pipe | Guided Bend Test (Face & Root) | Verify weld ductility and soundness |
| Finished Pipe | Flattening Test | Verify ductility and soundness of pipe body |
| Finished Pipe | Dimensional & Visual Inspection | Verify OD, WT, length, straightness, surface quality |
| Finished Pipe | Marking Verification | Ensure permanent marking per API 5L |
Additional Tests for PSL2 / Sour Service:
● HIC (Hydrogen Induced Cracking) Test per NACE TM0284
● SSC (Sulfide Stress Cracking) Test per NACE TM0177 Method A
● CVN Impact Testing at -10°C, -20°C, or -46°C
● Hardness Verification (≤ 22 HRC / ≤ 248 HV10 for HIC resistant)
Quality Documentation:
● Mill Test Certificate per EN 10204 Type 2.2, 3.1, or 3.2
● Hydrostatic Test Report (pipe-by-pipe)
● UT / ET Inspection Report
● Traceability from heat number to finished pipe
8. Primary Applications ERW Steel Pipe
ERW pipes are essential components in oil & gas transmission and various industrial applications:
Oil & Gas Transmission: Long-distance onshore and offshore pipelines for crude oil, natural gas, and refined petroleum products.
High-Pressure Fluid Transportation: Water injection lines, produced water disposal systems, and high-pressure fluid transfer in oilfields and processing facilities.
Onshore Pipeline Projects: Cross-country gathering lines, trunk lines, and distribution pipelines in oil and gas fields.
Offshore Pipeline Systems: Subsea flowlines, risers, and export pipelines for offshore platforms and subsea completions (with PSL2 and sour service options).
Sour Service Environments: Pipelines handling wet sour gas (H₂S containing) requiring PSL2 with supplementary requirements including HIC and SSC resistance per NACE standards.
Water Transmission: Large-diameter water supply pipelines, irrigation systems, and raw water transmission for municipal and industrial use.
Sewage & Wastewater Treatment: Effluent outfall lines, treatment plant piping, and sludge handling systems.
Industrial Structural Applications: Pipe racks, supports, bracing, and structural components in refineries, petrochemical plants, and industrial facilities.
Oil & Gas Processing Facilities: Flow lines, headers, manifolds, and interconnecting piping in processing plants and compressor stations.
EPC & Plant Piping: Process and utility piping in refineries, gas processing plants, chemical complexes, and power generation facilities.
9. Packaging & Shipping
ERW pipes are packaged and shipped with utmost care to ensure their protection during transit. Here is a description of the packaging and shipping process:
Packaging:
Protective Coating: Before packaging, pipes may be coated with a thin layer of anti-rust oil or protective varnish to prevent surface corrosion and oxidation during storage and transit. Bare finish also available for immediate coating application at destination.
Bundling: Pipes of similar dimensions and specifications are carefully bundled together in hexagonal or rectangular bundles. They are secured using steel straps (typically 3-5 straps per bundle) to prevent movement within the bundle.
End Caps: Plastic end caps (PE or PP) are placed on both ends of each pipe to protect beveled ends, plain ends, and threaded connections from impact damage, debris ingress, and moisture.
Padding and Cushioning: For premium export orders, padding materials such as foam rings or rubber strips may be used between pipe layers to prevent abrasion and coating damage during handling.
Wooden Crates or Cases: For thin-walled pipes, precision tubes, or premium coating orders, pipes may be packed in sturdy wooden crates or plywood cases to provide enhanced protection against external forces and rough handling.
Shipping:
Mode of Transportation: Pipes shipped via container vessels (20ft/40ft), bulk carriers, or rail freight depending on destination, volume, and urgency. Air freight available for sample or time-critical shipments.
Containerization: Small to medium orders loaded into standard shipping containers, protecting cargo from weather, moisture, and external contaminants during transit.
Bulk Vessel Loading: Large-volume orders (typically >200 tons) loaded directly into bulk carriers. Lifting beams and spreader bars prevent damage; dunnage and lashing secure cargo against sea motion.
Labeling & Documentation: Each bundle clearly labeled with grade, standard, dimensions, heat number, and handling instructions. Complete documentation (commercial invoice, packing list, bill of lading, Certificate of Origin, Mill Test Certificates) prepared for smooth customs clearance.
Secure Fastening: Bundles secured with steel strapping, dunnage bags, or timber bracing to prevent shifting, rolling, or damage during transit.
Tracking & Insurance: Container tracking numbers provided for real-time monitoring. Marine cargo insurance (All Risk or With Average) available upon request.
In summary, Womic Steel ensures that all ERW Steel pipes are packaged with industry-leading protective measures and shipped using reliable transportation methods to reach their destination in optimal condition. Proper packaging and shipping procedures are essential to preserving the integrity and quality of the delivered products.
10. Womic Steel Advantages & FAQ
Why Partner with Womic Steel?
One-Stop Shop: Complete range from API 5L ERW pipes to matching OEM pipe fittings (Elbows, Tees, Reducers, Flanges, Caps) in compatible material grades, including carbon steel, alloy steel, and stainless steel.
Technical Compliance: Full Mill Test Certificates (EN 10204 Type 2.2, 3.1, or 3.2) provided with every shipment, detailing exact chemical composition, mechanical test results, and non-destructive examination reports.
Value-Added Services: End beveling (30°-35°), threading & coupling, plastic caps installation, and anti-corrosion coating (FBE, 3LPE, 3LPP, Epoxy, Galvanizing) available in-house or through qualified partner facilities.
Competitive Logistics: Strategic partnership with global freight forwarders ensures optimized container loading (maximizing quantity per container) and cost-effective worldwide shipping with reliable transit times.
Inventory & Availability: Extensive stock of standard API 5L X52 sizes (2"-24" OD, Schedule 10-80) ensures short lead times and rapid response to urgent project requirements. Custom sizes produced on demand with typical lead time of 30-45 days.
Sour Service Capability: Full capability to supply PSL2 pipes with HIC and SSC testing per NACE standards for sour gas applications. Hardness controlled to ≤ 248 HV10 / ≤ 22 HRC.
Choose Womic Steel Group as your reliable partner for high-quality API 5L X52 ERW Steel Pipes and unbeatable delivery performance. Welcome to inquire!
Website: www.womicsteel.com
Email: sales@womicsteel.com
Tel/WhatsApp/WeChat:
Victor: +86-15575100681
Jack: +86-18390957568
Frequently Asked Questions (FAQ)
Q: What is the difference between S355J2H and other EN 10219 grades like S235JRH and S275JRH?
A: S235JRH has a minimum yield strength of 235 MPa, S275JRH has 275 MPa, and S355J2H has 355 MPa. S355J2H offers the highest strength among these three common grades. Additionally, S355J2H has J2 impact rating (-20°C, 27J minimum), while S235JRH and S275JRH have JR impact rating (room temperature, 27J minimum). For applications requiring higher strength or low-temperature impact resistance, S355J2H is the preferred choice. For projects requiring even higher strength (420 MPa or 460 MPa), S420MH and S460MH are available.
Q: What does the "J2H" designation mean in S355J2H?
A: The designation breaks down as follows: "S" stands for Structural steel, "355" indicates minimum yield strength of 355 MPa, "J2" specifies Charpy impact testing at -20°C with minimum 27J average energy, and "H" denotes Hollow section (cold-formed). For comparison: "JR" = room temperature impact (20°C), "J0" = 0°C impact, "J2" = -20°C impact, "K2" = -20°C impact with higher energy (40J minimum).
Q: Can S355J2H be used for welded structures? What welding procedures are recommended?
A: Yes, S355J2H offers excellent weldability due to its low carbon equivalent (CEV ≤ 0.45%). Recommended welding processes include MAG (135), TIG (141), MMA (111), and SAW (12). Preheating is generally not required for wall thicknesses below 20mm under normal shop conditions. For thicker sections or low ambient temperatures, preheating at 50-100°C is recommended. Welding consumables should match the base material strength (typically ER70S-6 or similar). Always qualify welding procedures according to EN 1090 or applicable standards.
Q: What shapes are available for EN 10219 S355J2H? Can you supply square and rectangular tubes?
A: Yes, EN 10219 covers cold-formed welded hollow sections in three shapes: round (circular hollow sections - CHS), square (square hollow sections - SHS), and rectangular (rectangular hollow sections - RHS). Womic Steel supplies all three shapes in S355J2H grade. Round sizes range from 21.3mm to 610mm OD. Square sizes from 20x20mm to 500x500mm. Rectangular sizes from 40x20mm to 600x400mm. Please provide your specific dimensional requirements for availability confirmation.
Q: What is the maximum length available for EN 10219 S355J2H ERW pipe?
A: We supply standard fixed lengths of 6 meters and 12 meters (approximately 20 and 40 feet) for diameters up to 610mm (24"). For smaller diameters (below 168mm / 6"), custom lengths up to 18 meters (60 feet) are available upon request. For square and rectangular sections, maximum length is typically 12 meters. Longer lengths for specific projects require detailed specification and engineering review.
Q: What is the difference between EN 10219 and EN 10210? Which one should I choose?
A: EN 10219 covers cold-formed welded structural hollow sections (ERW/HFW process), offering tighter dimensional tolerances and better surface finish. EN 10210 covers hot-finished structural hollow sections (seamless or hot-rolled welded), offering lower residual stresses and better performance for heavy load applications. For general construction, building frames, and precision applications, EN 10219 is typically more cost-effective. For heavy structural applications, offshore platforms, and dynamic loading conditions, EN 10210 may be preferred. Both standards include S355J2H grade with similar mechanical properties.
Q: Can EN 10219 S355J2H be used for offshore and marine applications?
A: Yes, S355J2H with J2 impact rating (-20°C) is suitable for many offshore and marine applications including topside structures, jacket bracing, deck supports, and marine equipment. However, for critical offshore applications requiring lower temperature impact (-40°C or -50°C) or stricter material requirements, S355ML, S355NL, or EN 10225 grades (S355G8+M, S355G10+M) are typically specified. Please provide your project specifications for proper grade recommendation.
Q: What surface finishes are available for EN 10219 S355J2H pipes?
A: We offer various surface finish options including: Bare (as-welded, mill scale), Oiled (light anti-rust oil coating), Black coated (lacquer or varnish), Primed (shop primer for welding), Hot-dip galvanized (zinc coating for corrosion protection), Painted (custom colors and systems), and Anti-corrosion coatings (epoxy, polyurethane, or other specified systems). For structural applications requiring corrosion protection, hot-dip galvanizing per EN ISO 1461 is the most common choice.
Q: What non-destructive testing (NDT) is available for EN 10219 S355J2H pipes?
A: We offer multiple NDT options: 100% Ultrasonic Testing (UT) of weld seam and pipe body, Eddy Current Testing (ET) for on-line weld quality inspection, Hydrostatic Testing (pressure testing), Visual and dimensional inspection, Magnetic Particle Inspection (MPI) for surface crack detection, and Radiographic Testing (RT) for weld seam verification. Standard EN 10219 does not mandate NDT for all applications, but we can provide any required testing per customer specification.
Q: Can you provide third-party inspection for EN 10219 S355J2H pipes?
A: Yes. We welcome and facilitate inspections by DNV, BV, SGS, TÜV, ABS, LR, or any client-nominated representative during production (witnessing dimensional inspection, NDT, mechanical testing) and prior to shipment. 3.2 inspection certificates validated by authorized third-party bodies are routinely supplied upon request. For European projects requiring CE marking, we provide Declaration of Performance (DoP) as part of compliance documentation.
Q: Do you provide cut-to-length and fabrication services for S355J2H sections?
A: Yes. We offer precision cutting to exact customer-specified lengths with tight tolerances (typically ±3mm) and clean, burr-free ends. Additional fabrication services include end beveling (for welding connections), end flattening (for specific connections), drilling (for bolt holes), notching (for frame connections), and welding of end plates or connection tabs. Please provide your fabrication drawings for custom requirements.
Q: What is the typical lead time for EN 10219 S355J2H ERW pipes?
A: Standard lead time for stock sizes (common diameters and wall thicknesses) is approximately 15-25 days. For non-stock or custom sizes, lead time is approximately 30-45 days from order confirmation. For large quantities (>500 tons) or special requirements (third-party inspection, special coating, custom lengths), lead time may extend to 45-60 days. Rush orders (15-20 days) may be available for smaller quantities of standard sizes. Please contact us for current lead times based on your specific requirements.
Q: What certifications and documentation do you provide with S355J2H pipe shipments?
A: Each shipment includes comprehensive documentation: Mill Test Certificate per EN 10204 Type 3.1 (or Type 2.2 / 3.2 upon request) including chemical composition, tensile properties, and impact test results; Dimensional Inspection Report; CE marking and Declaration of Performance (DoP) for European market; Packing List; Commercial Invoice; Bill of Lading; and Certificate of Origin (if required). For third-party inspected orders, additional inspection reports and witness certificates are provided.
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