Product Description
Product Short Description: Seamless Pipe Size: Outside Diameter: 6.0mm-610mm (1/8"-24"), Wall Thickness: 1.0mm-40.0mm, Length: 6m, 12m or as required
Standard & Grade of Seamless Pipe: EN 10216-5 Grade 1.4301 (X5CrNi18-10, equivalent to 304), Grade 1.4404 (X2CrNiMo17-12-2, equivalent to 316L); Also available 1.4307 (304L), 1.4401 (316), 1.4541 (321), 1.4571 (316Ti)
Usage of Seamless Pipe: Pressure vessels, chemical processing equipment, oil and gas pipelines, heat exchangers, pharmaceutical equipment, food processing, power generation, boiler tubes, general pressure applications, European market projects
Womic Steel offering high quality & competitive prices of EN 10216-5 stainless steel seamless pipes, pressure tubes, pipe fittings. Mill certificate, hydro test, UT/ET inspection, CE marking, PED compliance available. Fast delivery and best service.
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 seamless pipe production facility specializes in European standard stainless steel pressure tubes for the European market.
Production Size Range for EN 10216-5 1.4301/1.4404 Seamless Pipe: Outside diameter from 6.0mm to 610mm (1/8 inch to 24 inch) with wall thickness from 1.0mm to 40.0mm. Single random lengths of 6m, double random lengths of 12m, or custom lengths up to 18m as required.
Quality Certifications & Regulatory Compliance:
ISO 9001:2015 Certified: Quality management system ensuring consistent product quality across all operations.
EN 10216-5 Compliance: Full compliance with EN 10216-5:2014 Seamless steel tubes for pressure purposes - Part 5: Stainless steel tubes.
PED 2014/68/EU (CE Marking): Compliance with European Pressure Equipment Directive. CE marking and Declaration of Performance (DoP) provided for European market acceptance.
EN 10204 3.2 Certification: Inspection Certificate 3.2 validated by EU-authorized third-party bodies (TÜV, LR, BV, SGS) for critical pressure applications requiring full material traceability.
AD 2000 Merkblatt W2: Compliance with German technical rules for pressure vessels available upon request.
Third-Party Inspection (TPI) Approvals: Products and processes approved by SGS, BV, ABS, LR, DNV, GL, and TÜV.
Global Recognition: Womic Steel is a trusted supplier to European EPC contractors, pressure vessel manufacturers, and chemical plants serving over 80 countries worldwide, with special focus on European market.
EN 10216-5 1.4301/1.4404 Stainless Steel Seamless Pipe: Material Composition & Performance Characteristics
1.4301 (X5CrNi18-10) – Equivalent to 304/304L
EN 10216-5 1.4301 (also designated as X5CrNi18-10) is the European standard austenitic stainless steel for pressure purposes. The "X" indicates high-alloy steel, "5" represents carbon content (0.05%), "CrNi18-10" indicates 18% chromium and 10% nickel nominal content. This grade offers excellent corrosion resistance, good formability, and superior weldability, making it the most widely used stainless steel for general pressure applications.
1.4404 (X2CrNiMo17-12-2) – Equivalent to 316L
EN 10216-5 1.4404 (also designated as X2CrNiMo17-12-2) is the European standard molybdenum-bearing austenitic stainless steel. The "X2" indicates low carbon (0.02%), "CrNiMo17-12-2" indicates 17% chromium, 12% nickel, and 2% molybdenum nominal content. The molybdenum addition provides enhanced pitting and crevice corrosion resistance, particularly in chloride-containing environments.
EN 10216-5 1.4301/1.4404 Chemical Composition (Ladle Analysis, % by mass):
| Element | 1.4301 (X5CrNi18-10) | 1.4404 (X2CrNiMo17-12-2) |
| Carbon (C) | ≤ 0.07 | ≤ 0.020 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.015 | ≤ 0.015 |
| Chromium (Cr) | 17.0 - 19.0 | 16.5 - 18.5 |
| Nickel (Ni) | 8.0 - 10.5 | 10.0 - 13.0 |
| Molybdenum (Mo) | — | 2.0 - 2.5 |
| Nitrogen (N) | ≤ 0.11 | ≤ 0.11 |
Note: 1.4404 has low carbon (0.020% max) for improved weldability and resistance to intergranular corrosion. 1.4301 has slightly higher carbon (0.07% max) for general applications.
EN 10216-5 1.4301/1.4404 Mechanical Properties (Room Temperature):
| Property | 1.4301 | 1.4404 |
| Yield Strength (min, 0.2% offset) | 210 MPa (30,500 psi) | 220 MPa (32,000 psi) |
| Yield Strength (min, 1% offset) | 230 MPa (33,400 psi) | 240 MPa (34,800 psi) |
| Tensile Strength | 500-700 MPa (72,500-101,500 psi) | 500-700 MPa (72,500-101,500 psi) |
| Elongation (min, longitudinal) | 45% | 45% |
| Elongation (min, transverse) | 35% | 35% |
| Impact Energy (min, 20°C) | 100 J | 100 J |
*Note: EN 10216-5 requires higher elongation (45% vs ASTM 35%) and higher impact energy (100J vs 40J) compared to ASTM standards, reflecting more stringent European requirements for pressure applications.*
EN 10216-5 1.4301/1.4404 Physical Properties:
| Property | 1.4301 | 1.4404 |
| Density (g/cm³) | 7.9 | 8.0 |
| Melting Point (°C) | 1400-1450 | 1370-1400 |
| Modulus of Elasticity (GPa) | 200 | 200 |
| Thermal Conductivity (100°C, W/m·K) | 15 | 15 |
| Coefficient of Thermal Expansion (20-200°C, μm/m·K) | 16.5 | 16.5 |
| Electrical Resistivity (μΩ·cm) | 72 | 74 |
EN 10216-5 1.4301/1.4404 High Temperature Mechanical Properties:
| Temperature (°C) | 1.4301 Yield Strength (MPa) | 1.4404 Yield Strength (MPa) |
| 100 | 170 | 180 |
| 200 | 145 | 155 |
| 300 | 125 | 135 |
| 400 | 110 | 120 |
| 500 | 95 | 105 |
Note: 1.4404 maintains slightly higher strength at elevated temperatures due to molybdenum addition.
Grade Comparison – EN vs ASTM:
| EN Standard | EN Grade | Werkstoff | ASTM Equivalent | Key Difference |
| EN 10216-5 | X5CrNi18-10 | 1.4301 | 304 | Similar properties |
| EN 10216-5 | X2CrNi19-11 | 1.4307 | 304L | Low carbon version of 1.4301 |
| EN 10216-5 | X2CrNiMo17-12-2 | 1.4404 | 316L | Low carbon, Mo added |
| EN 10216-5 | X6CrNiMoTi17-12-2 | 1.4571 | 316Ti | Titanium stabilized |
| EN 10216-5 | X6CrNiTi18-10 | 1.4541 | 321 | Titanium stabilized |
Corrosion Resistance Comparison:
| Property | 1.4301 (304) | 1.4404 (316L) |
| General Corrosion | Good | Very Good |
| Pitting Resistance (PREN) | 18-20 | 24-26 |
| Crevice Corrosion | Moderate | Good |
| Chloride SCC Resistance | Moderate | Good |
| Intergranular Corrosion | Good (low carbon) | Excellent |
| Sulfuric Acid | Moderate | Good |
| Seawater Resistance | Poor | Good |
*Note: 1.4404 is recommended for marine environments, chloride-containing media, and applications requiring enhanced pitting resistance.*
EN 10216-5 1.4301/1.4404 Stainless Steel Seamless Pipe Dimensional Range & Standards Compliance
Womic Steel supplies EN 10216-5 1.4301 and 1.4404 seamless pipes across a wide dimensional spectrum, fully compliant with EN 10216-5:2014 standard.
| Item | Specification |
| Standard | EN 10216-5:2014 (Seamless steel tubes for pressure purposes - Part 5: Stainless steel tubes) |
| Grades | 1.4301 (X5CrNi18-10), 1.4404 (X2CrNiMo17-12-2) |
| Manufacturing Process | Seamless - Cold Drawn / Cold Rolled / Hot Finished |
| Outside Diameter Range | 6.0mm – 610mm (1/8" – 24") |
| Wall Thickness Range | 1.0mm – 40.0mm |
| Length | 6m (SR), 12m (DR), or custom lengths up to 18m |
| Delivery Condition | Solution annealed + water quenched / pickled |
| End Finish | Plain End (PE) / Beveled End (BE) |
| Surface Finish | Annealed & Pickled / Bright Annealed / Polished |
| Inspection Category | TC1 (2.2 cert) / TC2 (3.1 cert with NDT) / TC3 (3.2 cert with NDT) |
Dimensional Tolerances per EN 10216-5:
| Characteristic | Tolerance |
| Outside Diameter (OD) for D < 50mm | ±0.25mm |
| Outside Diameter (OD) for D 50-100mm | ±0.50mm |
| Outside Diameter (OD) for D > 100mm | ±1.0% |
| Wall Thickness (WT) for D/ WT ≥ 10 | ±12.5% |
| Wall Thickness (WT) for D/ WT < 10 | ±15% |
| Length (mill length) | +100mm, -0mm |
| Straightness | 0.15% of total length |
EN 10216-5 vs ASTM A312 Comparison:
| Feature | EN 10216-5 | ASTM A312 |
| Application Focus | Pressure purposes | General and pressure service |
| Elongation Requirement | 45% min (longitudinal) | 35% min |
| Impact Energy | 100J min at 20°C | Not required for standard grades |
| Carbon Limit (1.4404/316L) | 0.020% max | 0.030% max |
| CE Marking | Required for European market | Not applicable |
| Inspection Categories | TC1, TC2, TC3 with specific NDT | Hydrostatic or NDT |
| Typical Markets | Europe, Middle East, Africa | Americas, Asia, Global |
Manufacturing Process – Stainless Steel Seamless Tube
Womic Steel produces ASTM A213 TP321 stainless steel seamless tubes using advanced cold drawing and cold rolling processes, ensuring precise dimensional tolerances and superior surface finish.
Production Workflow (Cold Drawn / Cold Rolled Seamless Tube Process):
Raw Material Inspection (Billet): Incoming stainless steel round billets (typically 50-200mm diameter) are verified for chemical composition per ASTM A213 TP321 requirements (17-19% Cr, 9-12% Ni, Ti ≥ 5×C). Each billet is assigned a unique heat number for full material traceability throughout production.
Billet Heating & Piercing: Billets are heated to forging temperature (1150-1250°C) in rotary hearth furnaces and pierced via cross-roll piercing mill (Mannesmann process) to form hollow tube shells (hollow blooms).
Extrusion or Rolling: The pierced hollow shells undergo further hot rolling or extrusion to reduce diameter and wall thickness. For TP321, careful temperature control prevents titanium carbide precipitation during hot working.
Annealing (Intermediate): After hot working, tubes are solution annealed at 1040-1120°C followed by rapid cooling (water quenching or air cooling) to dissolve carbides and restore corrosion resistance.
Pickling & Descaling: Scale formed during annealing is removed by pickling in acid baths (nitric-hydrofluoric acid mixture), revealing a clean, uniform surface.
Cold Drawing (Single or Multiple Passes): Tubes undergo single or multiple cold drawing passes through precision dies and over mandrels to achieve required OD, WT, and dimensional tolerances. Typical reduction per pass: 20-40%.
Cold Rolling (Pilgering - Optional): For greater wall thickness reduction or improved surface finish, tubes are processed through cold pilger mills. This process is particularly effective for thin-wall and precision tubes.
Intermediate Annealing: Between drawing or rolling passes, tubes undergo intermediate annealing (1040-1120°C) to relieve work hardening and restore ductility for subsequent processing.
Final Heat Treatment (Solution Annealing): Tubes receive final solution annealing at 1040-1120°C followed by rapid cooling to achieve specified mechanical properties, corrosion resistance, and grain structure. This is critical for TP321 to ensure titanium carbides are properly dissolved and reprecipitated.
Straightening & Cutting: Precision straightening to meet standard straightness tolerances (0.15% of total length), followed by cutting to exact ordered lengths with clean, burr-free ends.
Finishing & Surface Inspection: Visual examination to ensure freedom from surface defects such as cracks, folds, laps, and scabs. Pickling or bright annealing applied as final surface finish.
End Finishing: Plain ends (square cut), beveled ends (30-35° bevel angle with 1.6mm ±0.8mm landing), or threaded ends as per customer specification.
Quality Control & Testing Procedures
| Stage | Inspection Method | Purpose |
| Raw Material (Billet) | Chemical Analysis (OES Spectrometer) | Verify compliance with ASTM A213 TP321 composition limits (Cr, Ni, Ti, C, etc.) |
| Raw Material (Billet) | Tensile Testing at Room Temperature | Verify base material strength before processing |
| Raw Material (Billet) | Ultrasonic Testing (UT) | Detect internal laminations and defects |
| In-Process | Dimensional Inspection (Micrometers, Calipers) | Monitor OD, WT during drawing and rolling |
| In-Process | Surface Visual Inspection | Detect surface defects (folds, laps, cracks) |
| Finished Tube | Solution Annealing Verification | Ensure proper heat treatment (1040-1120°C, rapid cooling) |
| Finished Tube | Tensile Testing (Room & High Temp) | Verify yield strength (min 205 MPa), tensile strength (min 515 MPa), elongation (min 35%) |
| Finished Tube | Hardness Test (HRB / HV) | Verify maximum hardness 92 HRB / 210 HV |
| Finished Tube | Flaring Test | Verify ductility and soundness (tube end expanded with tapered mandrel) |
| Finished Tube | Flattening Test | Verify ductility and soundness (tube flattened between parallel plates) |
| Finished Tube | Hydrostatic Testing | Each tube pressure tested to specified pressure (no leakage permitted) |
| Finished Tube | Eddy Current Testing (ET) | Continuous on-line inspection for surface and subsurface defects |
| Finished Tube | Ultrasonic Testing (UT) | Full body inspection for internal defects (supplementary requirement) |
| Finished Tube | Intergranular Corrosion Test (Optional) | Verify resistance to sensitization (per ASTM A262 Practice E) |
| Finished Tube | Dimensional & Visual Inspection | Verify OD, WT, length, straightness, surface quality |
| Finished Tube | Marking Verification | Ensure permanent marking per ASTM A213 (standard, grade, size, heat number) |
Supplementary Tests (Upon Request):
High Temperature Tensile Test
Creep and Stress Rupture Test
Charpy Impact Test (for low temperature applications)
Grain Size Measurement (per ASTM E112)
Intergranular Corrosion Test per ASTM A262 (Practice E - Strauss test)
Ferrite Content Measurement (for duplex stainless steel)
Quality Documentation:
Mill Test Certificate per EN 10204 Type 3.1 or 3.2
Hydrostatic Test Report (tube-by-tube)
ET / UT Inspection Report
Flaring / Flattening Test Report
Traceability from heat number to finished tube
NACE MR0175 certification (upon request)
Primary Applications – ASTM A213 TP321 Stainless Steel Seamless Tube
ASTM A213 TP321 stainless steel seamless tubes are essential components in high temperature and corrosive service environments across various industries:
Power Generation: Superheater tubes, reheater tubes, boiler water wall tubes, steam headers, and main steam pipelines in thermal power plants, combined cycle units, and nuclear power plants (non-core). TP321's high temperature strength up to 816°C makes it ideal for supercritical boiler applications.
Industrial Boilers: Steam generation systems, hot water boilers, waste heat recovery boilers (WHRB), and heat recovery steam generators (HRSG) for manufacturing facilities. The titanium stabilization prevents sensitization during welding and service.
Petrochemical & Refining: Heat exchangers, process heaters, cracking furnaces (ethylene crackers), reformer tubes, and high temperature fluid transfer lines in refineries and petrochemical plants. TP321 resists polythionic acid stress corrosion cracking in refinery service.
Chemical Processing: Reactors, reformers, high temperature piping systems handling corrosive gases and liquids, and equipment for nitric acid, sulfuric acid, and organic chemical production.
High Temperature Headers: Steam headers and manifold systems operating at temperatures between 400-800°C where creep resistance and thermal stability are critical.
Furnace Tubes: Radiant tubes, convection section tubes, and transfer lines in industrial furnaces, thermal oxidizers, and incinerators.
Heat Exchangers: Shell and tube heat exchangers, U-tube bundles, and condenser tubes for high temperature and corrosive service.
Aerospace & Defense: High temperature hydraulic lines, engine bleed air systems, and exhaust system components requiring oxidation resistance up to 800°C.
Pharmaceutical & Food Processing: High temperature steam lines and sterile processing equipment where corrosion resistance and cleanability are essential.
Common International Standards for Stainless Steel Seamless Tubes
| Standard | Full Standard Name | Applicable Grades | Typical Application |
| ASTM A213 | Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes | TP304, TP304L, TP304H, TP309, TP310, TP316, TP316L, TP316H, TP316Ti, TP321, TP321H, TP347, TP347H | Boiler tubes, superheater tubes, heat exchanger tubes |
| ASTM A312 | Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes | TP304/L, TP316/L, TP321, TP347, TP904L | General service stainless steel pipes, pressure piping |
| ASTM A269 | Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubes for General Service | TP304/L, TP316/L, TP321, TP347 | General service tubing, instrumentation, mechanical applications |
| ASTM A789 | Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service | S31803 (2205), S32205, S32750 (2507), S32760 | Duplex stainless steel tubes, general service |
| ASTM A790 | Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe | S31803 (2205), S32205, S32750 (2507), S32760 | Duplex stainless steel pipes, pressure applications |
| EN 10216-5 | Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 5: Stainless steel tubes | 1.4301 (304), 1.4307 (304L), 1.4401 (316), 1.4404 (316L), 1.4541 (321), 1.4878 (321H), 1.4550 (347) | Pressure purposes, European market |
| EN 10305-1 | Steel tubes for precision applications - Technical delivery conditions - Part 1: Seamless cold drawn tubes | E215, E235, E355 (carbon steel) | Precision applications, hydraulic cylinders |
| EN 10216-2 | Seamless steel tubes for pressure purposes - Non-alloy and alloy steel tubes with specified elevated temperature properties | P235GH, P265GH, P295GH, P355GH (carbon/alloy) | Pressure purposes, elevated temperature |
| JIS G3459 | Stainless steel pipes | SUS304TP, SUS304LTP, SUS316TP, SUS316LTP, SUS321TP, SUS347TP | Stainless steel pipes, Japanese market |
| JIS G3463 | Stainless steel boiler and heat exchanger tubes | SUS304TKA, SUS316TKA, SUS321TKA, SUS347TKA | Boiler and heat exchanger tubes, Japanese market |
| GB/T 14976 | Seamless stainless steel pipes for fluid transport | 0Cr18Ni9 (304), 00Cr17Ni14Mo2 (316L), 1Cr18Ni9Ti (321) | Fluid transport, Chinese market |
| GB/T 14975 | Seamless stainless steel pipes for structural purposes | 0Cr18Ni9 (304), 1Cr18Ni9Ti (321) | Structural purposes, Chinese market |
| GB 13296 | Seamless stainless steel tubes for boiler and heat exchanger | 0Cr18Ni9 (304), 0Cr17Ni12Mo2 (316), 1Cr18Ni9Ti (321) | Boiler and heat exchanger, Chinese market |
| ISO 1127 | Stainless steel tubes - Dimensions, tolerances and conventional masses per unit length | — | Dimensional standard for stainless steel tubes |
| NACE MR0175 / ISO 15156 | Petroleum and natural gas industries - Materials for use in H₂S-containing environments in oil and gas production | 304/L, 316/L, 321, 347, 2205, 2507 | Sour service, oil and gas production |
Packaging & Shipping
Packaging:
Protective Covering: Individual plastic sleeves or spiral wrapping applied to each tube to prevent surface scratches and moisture contact.
Bundling: Tubes bundled together and secured with steel straps (3-5 straps per bundle) with protective corner guards. Wooden dunnage or foam rings between layers prevents abrasion.
End Caps: Plastic end caps (PE or PP) on both ends protect beveled/plain ends and threads from impact damage and debris ingress.
Wooden Crates: For high-value or precision orders, tubes packed in sturdy wooden crates or plywood cases for enhanced protection.
Desiccant Bags: Added for moisture-sensitive applications or long sea freight.
Shipping:
Mode of Transportation: Container vessels (20ft/40ft), bulk carriers (>500 tons), or air freight for sample shipments.
Containerization: Tubes loaded into standard containers. Max load: 20-25 tons per 20ft, 25-28 tons per 40ft.
Bulk Vessel Loading: Large orders loaded directly into bulk carriers with lifting beams, dunnage, and lashing to secure cargo.
Labeling & Documentation: Each bundle labeled with grade, standard, dimensions, heat number. Complete shipping documents (invoice, packing list, bill of lading, COO, MTC) prepared for customs clearance.
Secure Fastening: Bundles secured with steel strapping, dunnage bags, or timber bracing to prevent shifting during transit.
Tracking & Insurance: Container tracking numbers provided. Marine cargo insurance available upon request.
Common Industry Applications Summary
| Industry | Application | Recommended Grade |
| Power Generation | Superheater tubes, reheater tubes, boiler water walls, steam headers | TP321, TP321H, TP347H |
| Petrochemical | Ethylene cracking furnace tubes, reformer tubes, heat exchangers | TP321, TP321H, TP347 |
| Oil & Gas | High temperature piping, heat exchanger bundles, process heaters | TP321, TP316/L, 2205 |
| Chemical Processing | Reactors, high temperature piping, corrosive service | TP321, TP316/L, 904L |
| Pharmaceutical | High purity steam lines, sterile processing equipment | TP304/L, TP316/L (BA finish) |
| Food & Beverage | Processing equipment, high temperature steam lines | TP304/L, TP316/L (BA finish) |
| Refining | Crude heaters, vacuum heaters, catalytic crackers | TP321H, TP347H |
| Aerospace | High temperature hydraulic lines, exhaust systems | TP321, 17-4PH |
| Desalination | High temperature brine heaters, evaporators | TP316/L, 2205, 2507 |
| Pulp & Paper | Digester tubes, bleach plant piping, recovery boilers | TP316/L, 2205, 904L |
Womic Steel Advantages & FAQ
Why Partner with Womic Steel for Stainless Steel Seamless Tubes?
Complete Range of Grades: Full portfolio of austenitic (304/304L, 316/316L, 321/321H, 347/347H, 310S), duplex (2205, 2507), and super austenitic (904L) stainless steel seamless tubes under one roof.
Multiple Standard Compliance: ASTM A213, A312, A269, A789, A790, EN 10216-5, EN 10305-1, GB/T 14976, JIS G3459, JIS G3463. One supplier for multiple market requirements.
Precision Manufacturing: Cold drawn and cold rolled (pilgered) processes ensuring tight dimensional tolerances (±0.05mm for precision tubes) and superior surface finish (BA, mirror, brushed).
Full Traceability: Each tube traceable from heat number to finished product with complete documentation.
Value-Added Services: End beveling (30-35°), plain end cutting, threading, plastic caps installation, and surface finishing (BA, pickled, polished, mirror) available in-house.
Quality Assurance: 100% hydrostatic testing, eddy current testing (ET), optional ultrasonic testing (UT), flaring and flattening tests performed on every tube.
Third-Party Inspection: Facilitation of inspections by DNV, BV, SGS, TÜV, ABS, LR. 3.2 certificates supplied upon request.
Global Logistics: Strategic partnership with freight forwarders for optimized container loading and cost-effective worldwide shipping.
Technical Support: Engineering team available for material selection, grade substitution, and application consulting.
Choose Womic Steel Group as your reliable partner for high-quality ASTM A213 TP321 stainless steel seamless tubes and unbeatable delivery performance for boiler, heat exchanger, and petrochemical projects worldwide. 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 EN 10216-5 1.4301 and ASTM A312 304?
A: Both are equivalent grades (304). EN 10216-5 1.4301 has stricter requirements for pressure applications including higher elongation (45% vs 35%) and mandatory impact testing (100J vs not required). EN 10216-5 also requires CE marking for European market acceptance.
Q: What is the difference between 1.4404 and 1.4301?
A: 1.4404 contains molybdenum (2.0-2.5%) which provides enhanced pitting and crevice corrosion resistance, particularly in chloride-containing environments (seawater, chemical processing). 1.4404 is the European equivalent of 316L. 1.4301 is the equivalent of 304, suitable for general corrosive service.
Q: What is the difference between 1.4404 and 1.4571 (316Ti)?
A: Both are molybdenum-bearing stainless steels. 1.4404 is low carbon (0.020% max) and suitable for welded applications without titanium stabilization. 1.4571 contains titanium (≥ 5×C) for stabilization and has higher carbon (≤ 0.08%). 1.4404 is preferred for most pressure applications; 1.4571 for elevated temperature service requiring stabilization.
Q: What does TC1, TC2, TC3 mean in EN 10216-5?
A: TC1 (Test Category 1): Standard testing - chemical analysis, tensile test, hydrostatic or NDT. TC2 (Test Category 2): Adds 100% NDT (UT or ET) and impact testing. TC3 (Test Category 3): TC2 plus third-party inspection and EN 10204 3.2 certification. For critical pressure applications, TC2 or TC3 is specified.
Q: Is CE marking required for EN 10216-5 pipes for European market?
A: Yes. For pressure equipment placed on the European market, CE marking per PED 2014/68/EU is mandatory. Womic Steel provides CE marking and Declaration of Performance (DoP) with all EN 10216-5 shipments for European projects.
Q: What is the maximum operating temperature for 1.4301 and 1.4404?
A: Per EN 10216-5 and PED, maximum service temperature is approximately 500°C for continuous service. For higher temperatures (500-800°C), stabilized grades like 1.4541 (321) or 1.4571 (316Ti) are recommended.
Q: Can EN 10216-5 pipes be used for ASME Code projects?
A: Yes, but with engineering approval. EN 10216-5 1.4404 is widely accepted for international projects but does not have ASME Code Case. For ASME stamping, ASTM A312 316L is typically specified. Consult design engineer for material substitution.
Q: What NDT is required for EN 10216-5?
A: Hydrostatic testing or eddy current testing (ET) is mandatory. For TC2 and TC3, 100% ultrasonic testing (UT) or eddy current testing of the entire tube is required. Supplementary NDT requirements can be specified by customer.
Q: Can you provide third-party inspection for EN 10216-5 pipes?
A: Yes. Inspections by DNV, BV, SGS, TÜV, ABS, LR available. 3.2 inspection certificates validated by EU-authorized third-party bodies supplied upon request. TC3 with third-party witnessing available.
Q: What is the typical lead time for EN 10216-5 1.4301/1.4404 seamless pipes?
A: Stock sizes: 15-25 days. Custom sizes: 30-45 days. TC2 or TC3 certification adds 10-15 days. Third-party inspection adds 10-15 days. CE marking and DoP provided standard.
Q: What documentation do you provide with EN 10216-5 pipe shipments?
A: Mill Test Certificate (EN 10204 Type 3.1 or 3.2), chemical composition report, tensile test report, impact test report (20°C, 100J min), hydrostatic test report, NDT report (UT/ET for TC2/TC3), dimensional report, CE marking and Declaration of Performance (DoP), packing list, commercial invoice, bill of lading.
Q: What surface finishes are available for EN 10216-5 pipes?
A: Annealed and pickled (standard, removes scale and provides clean surface), bright annealed (BA - reflective surface with minimal scale, ideal for hygienic applications), and mechanically polished (various grit finishes).
Q: Is 1.4404 suitable for seawater applications?
A: Yes, for moderately aggressive seawater conditions. 1.4404 (316L equivalent) offers good resistance to seawater corrosion. For more aggressive conditions (high chloride, elevated temperature, crevice conditions), duplex grades (1.4462/2205) or super duplex (1.4410/2507) are recommended.
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