ASTM A312 TP310S / TP310H Welded Stainless Steel Pipe: Manufacturing Capabilities & Product Specifications

Short Description:

Womic Steel supplies ASTM A312 TP310S / TP310H welded stainless steel pipe for extreme high-temperature service up to 1100°C. Grade 310S (25% chromium, 20% nickel) offers excellent oxidation resistance, sulfidation resistance, and creep strength at elevated temperatures. TP310S is the low carbon version (≤ 0.08% C) for general high-temperature service; TP310H has higher carbon (0.04-0.10%) for enhanced creep strength. Minimum yield strength 205 MPa (30,000 psi), tensile strength 515 MPa (74,700 psi) at room temperature.

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Manufacturing includes ERW for small diameters and EFW for large diameters, both with full penetration and post-weld solution annealing. Outside diameter from 6.35mm to 1219mm (1/4″ – 48″), wall thickness 0.5mm – 50mm, standard length up to 12m, custom up to 24m. Mill certificate, hydrotest, 100% UT, solution annealed and pickled finish, beveled or plain ends available. Suitable for furnace radiant tubes, heat treatment equipment, thermal oxidizers, cement kiln riser ducts, annealing covers, carburizing furnace components, petrochemical heater tubes, and nuclear reactor internals.

Welded Stainless Steel Pipe Size: Outside Diameter: 6.35mm – 1,219mm (1/4″ – 48″), Wall Thickness: 0.5mm – 50mm (Schedule 5S, 10S, 40S, 80S, 160), Length: 6m – 12m standard, custom lengths up to 24m

Standard & Grade of Welded Stainless Steel Pipe: ASTM A312 TP310S, TP310H; also ASME SA312; EN 10217-7 1.4845; Equivalent to AISI 310S, 310H

Usage of Welded Stainless Steel Pipe: Furnace radiant tubes and retorts (up to 1100°C), heat treatment furnace baskets and fixtures, thermal oxidizers and incinerators (high temperature), cement kiln riser ducts and preheater cyclones, annealing and sintering furnace covers, petrochemical pyrolysis tubes, carburizing furnace components, nuclear reactor internals (high temperature gas-cooled reactors), glass melting furnace parts, power plant superheater tubes (advanced ultra-supercritical), catalytic converter housings (high temperature), waste-to-energy plant boiler tubes

Womic Steel offering high quality & competitive prices of ASTM A312 TP310S/TP310H welded stainless steel pipe, high temperature stainless tube, ERW stainless pipe, EFW stainless pipe, oxidation resistant pipe, creep resistant pipe. Mill certificate EN 10204 3.1/3.2, hydro test, UT, solution annealed, beveled/plain ends, pickled finish available. Factory direct supply for heat treatment, furnace, petrochemical, 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 tubular products. Our specialized TP310S/310H welded pipe production facility utilizes multiple advanced welding technologies with controlled heat input to maintain high-temperature properties:

ERW (Electric Resistance Welding) Line: For diameters from 6.35mm to 610mm (1/4″ – 24″), wall thickness from 0.5mm to 12.7mm. High-frequency welding with optimized heat input. Ideal for small to medium diameter TP310S pipes for furnace tubing and instrumentation.

EFW (Electric Fusion Welding) Line: For diameters from 219mm to 1219mm (8″ – 48″), wall thickness from 4.0mm to 50mm. TIG (GTAW) root pass with SAW fill passes, using matching filler metal (ER310).

LSAW / SAWL Line for Stainless: For diameters from 406mm to 1524mm (16″ – 60″), wall thickness up to 50mm. Submerged arc welding of rolled TP310S plates.

All TP310S/310H welded 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) upon request

Womic Steel supplies TP310S welded pipes to over 40 countries across heat treatment, petrochemical, cement, and power generation industries.

Production Flexibility:

ERW: 6.35–610mm OD × 0.5–12.7mm WT × ≤ 12m

EFW: 219–1219mm OD × 4.0–50mm WT × ≤ 12m (longer upon request)

LSAW: 406–1524mm OD × 6.0–50mm WT × ≤ 18m

Finishing options: Annealed and pickled, bright annealed

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.

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

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 A358, A249)
Manufacturing Processes	ERW, EFW, LSAW
Outside Diameter Range	ERW: 6.35 – 610mm; EFW/LSAW: 219 – 1524mm
Wall Thickness Range	ERW: 0.5 – 12.7mm; EFW/LSAW: 4.0 – 50mm
Schedule Range	5S, 10S, 40S, 80S, 160 (for NPS 1/8″ – 48″)
Length Range	Standard: 6m; Extended: 12m, 18m, up to 24m
End Finish	Plain End (PE), Beveled End (BE)
Surface Finish	Annealed & Pickled, Bright Annealed
Tolerances	OD: ±0.5% or ±3.2mm; WT: ±12.5% (per ASTM A999); Length: +50mm / -0mm

Available Dimensions & Specifications – ASTM A312 TP310S/310H Welded Stainless Steel Pipe (Selected Typical Sizes)

NPS	OD (mm)	Schedule	WT (mm)	Weight (kg/m)	Standard Length	Typical Application
1/2″	21.3	40S	2.77	1.27	6m	Thermowell (high temp)
3/4″	26.7	40S	2.87	1.69	6m	Sensor protection tube
1″	33.4	40S	3.38	2.50	6m	Burner quarl tube
1-1/2″	48.3	40S	3.68	4.05	6m	Radiant coil
2″	60.3	40S	3.91	5.44	6m / 12m	Heater tube
3″	88.9	40S	5.49	11.3	6m / 12m	Radiant tube
4″	114.3	40S	6.02	16.1	6m / 12m	Pyrolysis tube
6″	168.3	40S	7.11	28.3	6m / 12m	Transfer line
8″	219.1	40S	8.18	42.6	12m	Thermal oxidizer
10″	273.0	40S	9.27	60.3	12m	Hot gas duct
12″	323.9	40S	10.31	79.8	12m	Main header
16″	406.4	40S	12.70	123.4	12m	Cement riser duct
20″	508.0	40S	15.09	183.5	12m	Incinerator duct
24″	609.6	40S	17.48	255.5	12m	Large diameter

Custom dimensions outside these ranges available. TP310H recommended for service above 800°C with sustained stress.

Common High-Temperature Stainless Steel Standards & Grades Manufactured by Womic Steel

Standard	Steel Grades	Typical Application	Welding Process
ASTM A312	TP310S, TP310H, TP309, TP309H, TP304H	High temperature, oxidation resistant	ERW/EFW/LSAW
ASTM A358	TP310S, TP310H, TP309	Electric fusion welded, high temperature	EFW
ASTM A249	TP310S	Boiler, superheater, heat exchanger	ERW/EFW
EN 10217-7	1.4845 (310S), 1.4828 (309)	Pressure purposes, high temp	SAW/ERW

Usage: Furnace radiant tubes (1100°C), thermal oxidizers, cement kilns, pyrolysis tubes, annealing covers.

Manufacturing Process – Welded Stainless Steel Pipe (ERW, EFW, LSAW)

Womic Steel employs three primary welding processes for TP310S/310H pipe production.

ERW (Electric Resistance Welding) Process – Small to Medium Diameter (6.35–610mm OD):

Raw Material (Strip/Coil) Inspection: TP310S strip verified for composition (Cr 24-26%, Ni 19-22%, C ≤ 0.08% or 0.04-0.10% for H).

Uncoiling & Leveling

Strip Edge Trimming

Forming: Continuous roll forming.

High-Frequency Welding: Heat input controlled (≤ 1.5 kJ/mm).

Seam Annealing: Induction annealing followed by water quench.

Sizing & Straightening

Cutting to Length

NDT: Eddy current test (100%) + optional UT.

Solution Annealing (Full Pipe): 1040-1120°C, water quench.

Hydrostatic Test

Pickling & Passivation

Final Inspection & Marking

EFW (Electric Fusion Welding) Process – Large Diameter (219–1219mm OD, 4.0–50mm WT):

Plate Preparation: TP310S plate, edges beveled (X bevel).

Roll Forming

Tack Welding

TIG (GTAW) Root Pass: Matching filler (ER310), argon backing gas.

SAW Fill & Cap Passes: Multi-pass SAW with controlled heat input, interpass ≤ 150°C.

Inner Weld

100% Radiographic Testing (per ASTM A358)

Solution Annealing: Full pipe heat treatment (1040-1120°C), water quench.

Pickling & Passivation

Hydrostatic Test

Dimensional Inspection & Marking

LSAW Process for Stainless – Very Large Diameter (406–1524mm OD, 6.0–50mm WT):

UOE or JCOE forming from TP310S plate

Double-sided SAW welding

Full solution annealing after welding

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 Welded 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
In-Process	Heat Input Monitoring	≤ 1.5 kJ/mm
Weld (ERW)	Eddy Current (100%)	Weld integrity
Weld (EFW/LSAW)	100% UT (or PAUT)	Detect weld defects
Weld (EFW/LSAW)	RT (spot or 100% per spec)	Weld quality
Weld	Dye Penetrant (PT)	Surface cracks
After Solution Annealing	Hardness Test	≤ 90 HRB
Finished Pipe	Hydrostatic Test	Pressure integrity
Finished Pipe	PMI	Confirm grade (Cr, Ni)
Finished Pipe	Flattening / Guided Bend	Ductility
Finished Pipe	Visual & Marking	Traceability