Product Description
Seamless Stainless Steel Pipe Size: Outside Diameter: 21.3mm – 610mm (1/2″ – 24″), Wall Thickness: 0.5mm – 50mm (Schedule 5S, 10S, 40S, 80S, 160, XXS), Length: 6m – 12m standard, custom lengths up to 18m
Standard & Grade of Seamless Stainless Steel Pipe: ASTM A312 TP310S, TP310H; also ASME SA312; EN 10216-5 1.4845; Equivalent to AISI 310S, 310H
Usage of Seamless Stainless Steel Pipe: Furnace radiant tubes and retorts (up to 1100°C), thermal oxidizers and incinerators (high temperature), cement kiln riser ducts and preheater cyclones, petrochemical pyrolysis tubes (ethylene cracking), superheater tubes (advanced ultra-supercritical power plants), heat treatment furnace baskets and fixtures, annealing and sintering furnace covers, glass melting furnace parts, nuclear reactor internals (HTGR), waste-to-energy plant boiler tubes, carburizing furnace components, catalytic converter housings (high temperature)
Womic Steel offering high quality & competitive prices of ASTM A312 TP310S/TP310H seamless stainless steel pipe, high temperature seamless tube, oxidation resistant seamless pipe, SMLS stainless pipe, heat resistant seamless tube, creep resistant seamless pipe. Mill certificate EN 10204 3.1/3.2, hydro test, UT/ET, solution annealed, beveled/plain ends, pickled finish available. Factory direct supply for furnace, petrochemical, power generation, and high-temperature industrial projects worldwide.
Womic Steel: Manufacturing Capabilities & Company Strength
Womic Steel Group is a premier manufacturer and global exporter with over 20 years of expertise in producing high-temperature stainless steel seamless tubular products. Our state-of-the-art seamless pipe production facility utilizes advanced hot-rolling and cold-drawing processes specifically optimized for high-chromium high-nickel grades:
Cold Drawn (CD) Seamless Line: For diameters from 21.3mm to 219.1mm (1/2″ – 8″), wall thickness from 1.0mm to 25mm. Cold drawing provides superior dimensional accuracy, excellent surface finish, and uniform grain structure – critical for high-temperature creep resistance. Preferred for smaller diameter pyrolysis tubes and superheater tubes.
Hot Finished (HF) Seamless Line: For diameters from 114.3mm to 610mm (4″ – 24″), wall thickness from 4.0mm to 50mm. Hot rolling process produces heavy wall pipes for large diameter high-temperature headers and furnace coils.
Extrusion Line (upon request): For diameters up to 914mm (36″) for special project applications.
All seamless stainless steel pipes undergo solution annealing (heat treatment) at 1040-1120°C followed by water quenching to dissolve carbides and restore high-temperature properties, followed by pickling and passivation.
Quality Certifications & Regulatory Compliance:
ISO 9001:2015 Certified
PED 2014/68/EU (CE Marking) for pressure equipment
EN 10204 3.2 Certification with third-party validation (TÜV, BV, SGS, LR)
Third-Party Inspection (TPI) approved by SGS, BV, ABS, DNV, TÜV
ASME Boiler and Pressure Vessel Code (Section I, VIII) compliance
Production Flexibility:
Cold Drawn: 21.3–219.1mm OD × 1.0–25mm WT × ≤ 12m
Hot Finished: 114.3–610mm OD × 4.0–50mm WT × ≤ 12m
Finishing options: Annealed and pickled, bright annealed (for small sizes)
ASTM A312 TP310S / TP310H: Material Composition & Performance Characteristics
ASTM A312 TP310S is an austenitic stainless steel with the highest chromium (25%) and nickel (20%) among common austenitic grades, providing exceptional oxidation resistance up to 1100°C. TP310S has low carbon (≤ 0.08% C) for weldability. TP310H has higher carbon (0.04-0.10%) for enhanced creep strength at elevated temperatures. This grade is often specified for the most demanding high-temperature applications where 309 is insufficient.
Chemical Composition (Ladle Analysis, % by mass):
| Element | TP310S (ASTM A312) | TP310H (ASTM A312) |
| C | ≤ 0.08 | 0.04 – 0.10 |
| Mn | ≤ 2.00 | ≤ 2.00 |
| P | ≤ 0.045 | ≤ 0.045 |
| S | ≤ 0.030 | ≤ 0.030 |
| Si | ≤ 1.50 | ≤ 1.50 |
| Cr | 24.0 – 26.0 | 24.0 – 26.0 |
| Ni | 19.0 – 22.0 | 19.0 – 22.0 |
| N | ≤ 0.10 | ≤ 0.10 |
Mechanical Properties (Room Temperature, Solution Annealed):
| Property | TP310S | TP310H |
| Yield Strength (min, 0.2% offset) | 205 MPa (30,000 psi) | 205 MPa (30,000 psi) |
| Tensile Strength (min) | 515 MPa (74,700 psi) | 515 MPa (74,700 psi) |
| Elongation (min, 50mm gauge) | 35% | 35% |
| Hardness (max) | 90 HRB | 90 HRB |
Physical Properties:
Density: 7.98 g/cm³
Modulus of Elasticity: 200 GPa (29 × 10⁶ psi) at room temperature, 150 GPa at 800°C
Thermal Conductivity: 14.2 W/m·K at 100°C, 18.0 W/m·K at 800°C
Coefficient of Thermal Expansion: 15.9 × 10⁻⁶/°C (20-100°C), 18.0 × 10⁻⁶/°C (20-800°C)
High-Temperature Properties:
Maximum continuous service temperature in air: 1100°C (2010°F) for TP310S
Scaling resistance: Excellent up to 1100°C due to high chromium (25%)
Creep strength at 900°C: TP310H significantly higher than TP310S
Oxidation resistance in air: Outstanding
Carburization resistance: Excellent (high nickel content)
Sulfidation resistance: Good (better than 309, much better than 304)
Comparison with TP309 and 304:
TP310S (25% Cr, 20% Ni) has higher oxidation resistance (1100°C) than TP309 (23% Cr, 13% Ni, max 1000°C)
TP310S has better carburization and sulfidation resistance due to higher nickel
TP310H is preferred for creep-critical applications above 700°C
Dimensional Range & Standards Compliance
| Item | Specification |
| Standard | ASTM A312 / ASME SA312 (also A213, A269, A999) |
| Manufacturing Processes | Cold Drawn (CD), Hot Finished (HF) |
| Outside Diameter Range | 21.3mm – 610mm (1/2″ – 24″) |
| Wall Thickness Range | 0.5mm – 50mm (Schedule 5S, 10S, 40S, 80S, 160, XXS) |
| Length Range | Standard: 6m; Extended: 12m, 18m, up to 18m |
| End Finish | Plain End (PE), Beveled End (BE) |
| Surface Finish | Annealed & Pickled, Bright Annealed |
| Tolerances (per ASTM A999) | OD: ±0.5% or ±3.2mm; WT: ±12.5% (OD < 4″) / ±15% (OD ≥ 4″); Length: +50mm / -0mm |
| Straightness | ≤ 0.2% of total length (cold drawn); ≤ 0.25% (hot finished) |
Available Dimensions & Specifications – ASTM A312 TP310S/310H Seamless Stainless Steel Pipe (Selected Typical Sizes)
| NPS | OD (mm) | Schedule | WT (mm) | Weight (kg/m) | Process | Standard Length | Typical Application |
| 1/2″ | 21.3 | 40S | 2.77 | 1.27 | CD | 6m | Thermowell (high temp) |
| 3/4″ | 26.7 | 40S | 2.87 | 1.69 | CD | 6m | Sensor protection tube |
| 1″ | 33.4 | 40S | 3.38 | 2.50 | CD | 6m | Burner quarl tube |
| 1-1/2″ | 48.3 | 80S | 5.08 | 5.41 | CD | 6m | Radiant coil |
| 2″ | 60.3 | 80S | 5.54 | 7.48 | CD | 6m / 12m | Pyrolysis tube |
| 3″ | 88.9 | 80S | 7.62 | 15.3 | CD/HF | 6m / 12m | Radiant tube |
| 4″ | 114.3 | 80S | 8.56 | 22.3 | CD/HF | 6m / 12m | Ethylene cracker |
| 6″ | 168.3 | 80S | 10.97 | 42.6 | HF | 6m / 12m | Transfer line |
| 8″ | 219.1 | 80S | 12.70 | 64.7 | HF | 12m | Thermal oxidizer |
| 10″ | 273.0 | 80S | 15.09 | 96.0 | HF | 12m | Hot gas duct |
| 12″ | 323.9 | 80S | 17.48 | 132.1 | HF | 12m | Main header |
| 16″ | 406.4 | 80S | 21.44 | 203.6 | HF | 12m | Cement riser duct |
Custom dimensions outside these ranges available. TP310H recommended for service above 800°C with sustained stress.
Common Seamless High-Temperature Stainless Steel Standards & Grades Manufactured by Womic Steel
| Standard | Steel Grades | Typical Application | Manufacturing Process |
| ASTM A312 | TP310S, TP310H, TP309S, TP309H, TP304H, TP316H | Extreme high temperature, oxidation resistant | CD/HF |
| ASTM A213 | TP310S, TP310H, TP309S | Boiler, superheater, heat exchanger tubes | CD |
| ASTM A269 | TP310S | General service tubing | CD |
| EN 10216-5 | 1.4845 (310S) | Pressure purposes, high temp | CD/HF |
Usage: Furnace radiant tubes (1100°C), ethylene cracking pyrolysis tubes, thermal oxidizers, cement kilns, superheater tubes (advanced ultra-supercritical), annealing covers.
Manufacturing Process – Seamless Stainless Steel Pipe (Cold Drawn / Hot Finished)
Womic Steel employs two primary seamless manufacturing processes for TP310S/310H production.
Cold Drawn (CD) Process – Small to Medium Diameter (21.3–219.1mm OD):
Raw Material (Billet) Inspection: Billet verified for TP310S composition (Cr 24-26%, Ni 19-22%, C ≤ 0.08% or 0.04-0.10% for H).
Billet Preparation: Cut to length, center-drilled, heated to 1150-1250°C.
Piercing / Rotary Forging: Heated billet pierced to create hollow shell.
Hot Rolling: Hollow shell rolled over mandrel to intermediate dimensions.
Pickling: Scale removal before cold drawing.
Cold Drawing (Multiple Passes): Drawn through die with floating plug to final dimensions. Multiple passes with intermediate annealing for heavy reductions.
Solution Annealing: 1040-1120°C, water quench. Critical for dissolving carbides.
Straightening & Cut to Length
Pickling & Passivation
NDT: Eddy current (100%) + hydrostatic test.
Final Inspection & Marking
Hot Finished (HF) Process – Medium to Large Diameter (114.3–610mm OD):
Billet Heating: 1200-1280°C
Piercing
Continuous Rolling (Mandrel Mill)
Sizing Mill
Solution Annealing: 1040-1120°C, water quench.
Pickling & Passivation
NDT & Hydrostatic Test
Final Inspection & Marking
Special Considerations for TP310H:
Higher carbon (0.04-0.10%) provides higher creep strength
Must be solution annealed to avoid carbide precipitation
For field welding, use ER310 filler and control interpass temperature
Quality Control & Testing Procedures for ASTM A312 TP310S/310H Seamless Stainless Steel Pipe
| Stage | Inspection Method | Purpose |
| Raw Material | Chemical Analysis (OES) | Verify TP310S (Cr 24-26%, Ni 19-22%) |
| Raw Material | Tensile Testing | Yield ≥ 205 MPa, Tensile ≥ 515 MPa |
| Raw Material | Elevated Temperature Tensile (if specified) | Verify strength at service temp |
| Raw Material | Grain Size (ASTM E112) | TP310H typically ASTM 5-7 |
| After Solution Annealing | Hardness Test | ≤ 90 HRB |
| Finished Pipe | Hydrostatic Test (Mandatory) | Pressure integrity – 85-100% SMYS |
| Finished Pipe | Eddy Current Test (100%) | Surface/near-surface defects |
| Finished Pipe | Flattening / Flaring Test | Ductility |
| Finished Pipe | PMI | Confirm grade (Cr, Ni) |
| Finished Pipe | Intergranular Corrosion Test (A262 Practice E) | Detect sensitization (if specified) |
| Finished Pipe | Visual & Marking | Traceability |
Optional for High-Temperature Service:
Elevated temperature tensile test (e.g., at 900°C)
Oxidation test (weight gain after exposure at 1100°C for 100h)
Creep rupture test (for TP310H, e.g., 1000h at 950°C, 20 MPa)
Grain size measurement for creep strength verification
Primary Applications – ASTM A312 TP310S/310H Seamless Stainless Steel Pipe
Furnace radiant tubes and retorts: Direct-flame exposure in high-temperature heat treating furnaces (1100°C). TP310S resists oxidation and scaling.
Ethylene cracking furnace pyrolysis tubes: Ethylene production from naphtha or ethane cracking (800-900°C). TP310H is standard for pyrolysis service.
Thermal oxidizers and incinerators: High-temperature ducting and stacks (900-1100°C) for chemical, waste, and VOC destruction.
Cement kiln riser ducts and preheater cyclones: Handling hot cement dust and gases (900-1050°C) with abrasion and oxidation.
Superheater tubes (advanced ultra-supercritical power plants): Steam temperatures up to 700°C with high creep strength requirements (TP310H).
Heat treatment furnace baskets and fixtures: Supporting parts during carburizing, nitriding, and other high-temperature processes.
Annealing and sintering furnace covers: Protective covers for annealing operations in metal processing.
Nuclear reactor internals (HTGR): High-temperature gas-cooled reactors (up to 950°C).
Glass melting furnace parts: Supports and components exposed to molten glass and high temperatures.
Waste-to-energy plant boiler tubes: Superheater tubes in waste incineration (high chlorides, high temperature).
Catalytic converter housings (high temperature): Catalytic systems operating at 900-1000°C.
Packaging & Shipping – ASTM A312 TP310S/310H Seamless Stainless Steel Pipe
Packaging:
Anti-corrosion protection: VCI paper or plastic wrap. For high-temperature service, no oil residue.
End caps: Plastic caps for beveled ends.
Bundling (Small diameters): Bundles with steel straps and interleaving paper.
Individual packaging (Large diameters): Plastic film wrap.
Wooden crates for critical high-temperature applications.
Shipping:
Containers for ≤ 610mm, break-bulk for larger diameters.
Documentation: MTC 3.1/3.2, hydrotest report, eddy current/UT reports, PMI report, dimensional report, packing list, COO. Optional high-temperature test reports upon request.
10. Womic Steel Advantages & FAQ – ASTM A312
Womic Steel Advantages & FAQ – ASTM A312 TP310S/310H Seamless Stainless Steel Pipe
Why Partner with Womic Steel for TP310S/310H Seamless Pipe?
Complete Size Range: Cold Drawn 1/2″ – 8″, Hot Finished 4″ – 24″.
Full solution annealing (1040-1120°C, water quench).
TP310H available for creep-critical high-temperature service (up to 1100°C).
Elevated temperature tensile and creep testing available.
Grain size control (ASTM 5-7) for optimal creep properties.
Competitive lead times: 30-40 days for CD, 40-60 days for HF.
Global Certification: ISO 9001, PED (CE), EN 10204 Type 3.2.
Frequently Asked Questions (FAQ) – ASTM A312 TP310S/310H Seamless Stainless Steel Pipe
Q: What is the difference between TP310S and TP310H?
A: TP310S has low carbon (≤ 0.08%) for better weldability and resistance to intergranular corrosion in as-welded condition. TP310H has higher carbon (0.04-0.10%) for enhanced creep strength at elevated temperatures (above 700°C). For continuous high-temperature service under stress (e.g., radiant tubes, pyrolysis tubes), TP310H is required. For cyclic service or where post-weld heat treatment is not possible, TP310S is acceptable.
Q: What is the maximum service temperature for TP310S?
A: TP310S is suitable for continuous service in air up to 1100°C (2010°F) with good oxidation resistance. For intermittent service, it can withstand up to 1150°C. Above 1100°C, scaling increases; nickel-based alloys (e.g., Alloy 600, 601) are recommended.
Q: How does TP310S compare to TP309 for high-temperature service?
A: TP310S has higher chromium (25% vs 23%) and higher nickel (20% vs 13%), providing significantly better oxidation resistance (1100°C vs 1000°C) and better carburization/sulfidation resistance. TP310S is more expensive but offers longer life in aggressive high-temperature environments.
Q: Is TP310H necessary for radiant tubes in ethylene cracking furnaces?
A: Yes. Ethylene cracking furnace tubes operate at 800-900°C under high internal pressure (creep conditions). TP310H with higher carbon and controlled grain size provides the required creep rupture strength. TP310S would have shorter life. ASTM A213 TP310H is specified for this service.
Q: Does TP310S require solution annealing after processing?
A: ASTM A312 requires solution annealing for seamless pipe. For TP310S, post-processing solution annealing is mandatory to meet mechanical properties and corrosion resistance. Womic performs solution annealing on all TP310S seamless pipes.
Q: What welding filler metal is recommended for TP310S?
A: For welding TP310S, AWS A5.9 ER310 filler is recommended, matching the base metal composition (25Cr-20Ni). For TP310H, ER310 is also used. For joining TP310S to carbon steel, ER309L is used as an overlay.
Q: What is the typical lead time for TP310S seamless pipe?
A: 30-40 days for CD (small to medium diameters), 40-60 days for HF (large diameters). TP310H may have longer lead times due to specialty billet sourcing. Third-party inspection adds 7-14 days.
Q: Can TP310S be used for service with molten metals (e.g., aluminum, zinc)?
A: Limited. TP310S is resistant to molten aluminum up to about 700°C (due to high nickel). For molten zinc, it is not recommended. For molten copper or lead, other alloys are preferred. Consult corrosion data for specific molten metal contact.
Project Reference – European Ethylene Cracking Furnace Pyrolysis Tube Replacement (Germany)
Country: Germany (North Rhine-Westphalia, chemical complex)
Standard & Grade: ASTM A312 TP310H (seamless) – with supplementary creep testing
Dimensions & Quantity:
OD 88.9mm (3″) × Schedule 160 (11.13mm WT) – 400 meters (approx. 12 tons) – Cold Drawn
OD 114.3mm (4″) × Schedule 160 (12.70mm WT) – 300 meters (approx. 14 tons) – Cold Drawn
OD 168.3mm (6″) × Schedule 160 (18.26mm WT) – 100 meters (approx. 10 tons) – Hot Finished
Total: 800 meters, approx. 36 tons
Specifications: ASTM A312 TP310H seamless, solution annealed and pickled, beveled ends. Hydrostatic testing. Eddy current (CD) and UT (HF). PMI on every pipe. Mandatory elevated temperature tensile test at 950°C (spec min 80 MPa, achieved 115-140 MPa). Creep rupture test at 950°C, 20 MPa, 1,000h – no rupture. Grain size ASTM 5-7. Carburization test (exposure to 5% CH₄/95% H₂ at 950°C for 500h) – weight gain < 0.3 mg/cm². Intergranular corrosion test per ASTM A262 Practice E (pass). Third-party inspection by TÜV Germany.
Application: Replacement of radiant coils (pyrolysis tubes) in an ethylene cracking furnace (naphtha cracker) at a petrochemical complex. The radiant section operates at 880-950°C, with internal pressure 2.5-3.0 MPa. Process fluid: hydrocarbon vapor (ethane/propylene mixture). The previous HK40 (35Cr-45Ni) alloy coils had reached end of life after 12 years. TP310H was selected as a high-performance alternative with excellent creep strength and carburization resistance.
Technical Challenges & Solutions:
Creep strength at 950°C – TP310H with carbon 0.08-0.09% and fine grain (ASTM 6) provided creep rupture strength > 20 MPa at 950°C for > 5,000h (predicted). Womic performed creep test at 950°C, 20 MPa, 1,000h – no rupture, elongation 10%. Elevated temperature tensile at 950°C: yield 115-135 MPa. Client accepted.
Carburization resistance – Ethylene cracking atmosphere causes carburization of tube walls. TP310H with 25% Cr and 20% Ni forms a protective Cr₂O₃ scale that reduces carbon ingress. Womic performed carburization test (exposure to 5% CH₄/95% H₂ at 950°C for 500h). Weight gain 0.22 mg/cm², carburized depth < 0.15mm. Acceptable for 10-year service life.
Grain size control for ASME Section I compliance – Pyrolysis tubes require ASTM grain size 5-7 for optimal creep strength. Womic controlled grain size through solution annealing temperature (1090-1120°C) and cooling rate. Results: ASTM 5.5-6.5 on base metal, acceptable for specification.
Weld metal creep strength matching – Cold drawn seamless tubes must be weldable in the field. Womic provided weld coupons (4″ Schedule 160) with WPS using GTAW with ER310 filler, preheat 20-50°C, interpass ≤ 150°C, heat input ≤ 1.5 kJ/mm. Coupons passed RT, PT, and elevated temperature tensile at 950°C (weld metal yield 105-125 MPa).
Oxidation resistance at 950°C – TP310H forms a protective Cr₂O₃ scale at 950°C. Womic performed oxidation test (air at 950°C for 500h): weight gain 0.35 mg/cm². Oxide scale thickness < 10μm. Acceptable.
Logistics to German chemical plant – Pipes shipped from Shanghai to Hamburg port, then trucked to site. TÜV Germany inspected pipes at Hamburg. All 36 tons delivered in 2 shipments over 8 weeks. Documentation package accepted without queries.
Result: New TP310H pyrolysis tubes installed during Q3 2023 turnaround. After 18 months of operation at 900-930°C, inspection showed minimal carburization (wall thickness reduction < 0.2mm) and no creep deformation. Client expects 12+ year service life. Womic Steel is now a qualified supplier for this petrochemical complex's high-temperature alloy needs.
Contact:
Website: www.womicsteel.com
E-mail: sales@womicsteel.com
Tel / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568
Womic Steel – Your reliable partner for ASTM A312 TP310S/TP310H seamless stainless steel pipes for ethylene cracking furnaces, thermal oxidizers, cement kilns, and extreme high-temperature industrial applications worldwide.
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