API 5L GR.B ERW Steel Pipe – Reliable Line Pipe for Oil, Gas & Water Transmission

Short Description:

Womic Steel supplies high quality API 5L GR.B ERW steel pipe for oil, gas, and water transmission pipelines. API 5L GR.B line pipe is widely used for onshore and offshore pipeline projects, water supply systems, and industrial fluid transportation. Outside diameter from 60.3mm to 610mm (2″ to 24″), wall thickness from 3.0mm to 19.1mm (Schedule 10 to Schedule 80), length up to 18m. Available in PSL1 and PSL2. Mill certificate, hydro test, UT/ET inspection, beveled end, plastic caps, 3PE/FBE coating available. Competitive price and fast delivery.

ERW Steel Pipe Size: Outside Diameter: 60.3mm-610mm (2″-24″), Wall Thickness: 3.0mm-19.1mm (Sch10-Sch80), Length: 6m, 12m or as required

Standard & Grade of ERW Steel Pipe: API 5L PSL1/PSL2 Grade GR.B; Also available X42, X52, X60, X65, X70

Usage of ERW Steel Pipe: Oil transmission pipeline, natural gas pipeline, water supply system, sewage transportation, industrial fluid piping, onshore pipeline project, offshore pipeline project, refinery piping, chemical processing, mining services

Womic Steel offering high quality & competitive prices of API 5L GR.B ERW steel pipes, line pipes, pipe fittings, stainless pipes and fittings. Mill certificate, hydro test, UT/ET inspection, beveled end, plastic caps, 3PE/FBE coating available. Fast delivery and best service.

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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 API 5L GR.B ERW Pipe: Outside diameter from 60.3mm to 610mm (2 inch to 24 inch) with wall thickness from 3.0mm to 19.1mm (Schedule 10 to Schedule 80). 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.

API 5L Monogram License: Authorized to manufacture API 5L line pipe, demonstrating commitment to highest industry standards for oil and gas transmission pipelines.

CE Marking (PED 2014/68/EU): Compliance with European Pressure Equipment Directive for smooth customs clearance within EEA.

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 projects.

Additional Certifications: ISO 14001, ISO 45001, NACE MR0175 / ISO 15156 for sour service applications.

Global Recognition: Womic Steel is a trusted supplier to national oil companies (NOCs), Fortune 500 energy companies, and global EPC contractors, serving over 80 countries across Southeast Asia, Europe, the Middle East, Africa, and the Americas.

2. API 5L GR.B ERW Steel Pipe: Material Composition & Performance Characteristics

API 5L GR.B (also designated as L245 under ISO 3183) is the most widely used line pipe grade for oil, gas, and water transmission pipelines. The "GR.B" indicates Grade B with minimum yield strength of 35,000 psi (approximately 240 MPa). The "L245" designation under ISO standard represents the same material with yield strength of 245 MPa.

Compared to higher grades like X42 (42,000 psi yield) and X52 (52,000 psi yield), GR.B offers lower strength but excellent weldability, formability, and cost-effectiveness. This makes GR.B the preferred choice for low to medium pressure pipelines, water transmission systems, and general fluid transportation where ultra-high strength is not required. GR.B is the most economical line pipe grade for non-critical applications.

API 5L GR.B ERW Steel Pipe Chemical Composition (Ladle Analysis, % by mass):

Element	C max	Mn max	P max	S max	Cr max	Ni max	Cu max	Mo max	V max
PSL1	0.26	1.20	0.030	0.030	—	—	—	—	—
PSL2	0.22	1.20	0.025	0.015	0.30	0.30	0.50	0.15	0.10

Note: PSL2 requirements are more stringent with lower carbon, phosphorus, and sulfur limits. For PSL2, carbon equivalent (CE) limits apply: CE(IIW) ≤ 0.43% for welded pipes.

API 5L GR.B ERW Steel Pipe Mechanical Properties (Room Temperature):

Property	PSL1 Requirement	PSL2 Requirement
Yield Strength (min)	35,000 psi (240 MPa)	35,000 psi (240 MPa)
Yield Strength (max)	No maximum	65,000 psi (450 MPa)
Tensile Strength (min)	60,000 psi (415 MPa)	60,000 psi (415 MPa)
Ratio (Yield/Tensile)	No specific limit	≤ 0.85 for ≤ 0.93
Elongation (min)	Calculated per formula	Calculated per formula

*Note: PSL2 imposes additional requirements including maximum yield strength limits, maximum yield-to-tensile ratio, and mandatory Charpy impact testing.*

API 5L GR.B ERW Steel Pipe Low-Temperature Impact Properties (Charpy V-Notch) - PSL2:

Test Location	Temperature	Average Energy (min)	Individual Energy (min)
Pipe Body (Longitudinal)	0°C	40 Joules	30 Joules
Weld Metal (Transverse)	0°C	40 Joules	30 Joules
Heat Affected Zone (HAZ)	0°C	40 Joules	30 Joules

*Note: Impact testing is mandatory for PSL2. For sour service applications, lower temperatures (-10°C or -20°C) and hardness restrictions (≤ 248 HV10 / ≤ 22 HRC) apply.*

3. API 5L GR.B ERW Steel Pipe Dimensional Range & Standards Compliance

Womic Steel supplies API 5L GR.B ERW pipes across a wide dimensional spectrum, fully compliant with API 5L 46th Edition and ISO 3183 standards.

Item	Specification
Standard	API 5L 46th Edition / ISO 3183
Product Specification Level	PSL1 (Standard) / PSL2 (Enhanced)
Grade	GR.B (L245)
Manufacturing Process	Electric Resistance Welding (ERW) / High Frequency Welding (HFW)
Outside Diameter Range	60.3mm – 610mm (2 inch – 24 inch)
Wall Thickness Range	3.0mm – 19.1mm (Schedule 10 – Schedule 80)
Length	6m (SR), 12m (DR), or custom lengths up to 18m
End Finish	Plain End (PE) / Beveled End (BE) / Threaded & Coupled (T&C)
Surface Finish	Bare / Oiled / Black Coated / 3PE / FBE / Galvanized
Tolerances	OD: ±0.75% / WT: -0% +15% / 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 for Piling Pipe

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 API 5L GR.B and ASTM A53 GR.B?

A: Both have similar strength (240 MPa yield). API 5L GR.B is for line pipe (oil, gas, water transmission). ASTM A53 GR.B is for general pressure piping (water, gas, steam). API 5L has stricter quality and traceability requirements.

Q: What is the difference between API 5L PSL1 and PSL2 for GR.B?

A: PSL1 is standard quality with basic requirements. PSL2 has stricter limits on carbon, P, S, plus mandatory impact testing, yield/tensile ratio limits, and enhanced NDT. PSL2 is required for offshore and sour service.

Q: Can API 5L GR.B be used for water transmission?

A: Yes. For potable water, specify internal coating (epoxy or cement mortar) to prevent corrosion.

Q: What is the difference between ERW and HFW?

A: HFW uses high-frequency current (200-500 kHz), producing narrower HAZ and better weld quality. For API 5L GR.B, HFW is the preferred process.

Q: What is the maximum length available?

A: Standard lengths: 6m and 12m. Custom lengths up to 18m available for diameters below 168mm. Longer lengths require engineering review.

Q: What end finishes do you offer?

A: Plain ends (square cut), beveled ends (30°-35°), threaded ends, and coupled ends.

Q: Can you provide third-party inspection?

A: Yes. We facilitate inspections by DNV, BV, SGS, TÜV, ABS, LR. 3.2 certificates available.

Q: What coating options are available?

A: FBE, 3LPE, 3LPP, coal tar epoxy, cement mortar lining, galvanizing, black coating.