ASTM A312 TP310S Heat-Resistant Stainless Steel Pipe

What does ASTM A312 mean?

ASTM A312 is the premier global standard specification for seamless, straight-seam welded, and heavily cold-worked austenitic stainless steel pipes. It is designed specifically for high-temperature applications and general corrosive service.

 

China TP310S Pipe Manufacturers, Suppliers, Stockists, and Factory

GNEE Stainless boasts over 18 years of specialized expertise in manufacturing high-temperature stainless steel piping. Our products are exported to more than 60 countries globally, with successful deliveries across over 80 projects in the energy, petrochemical, and heat treatment sectors, providing reliable and durable piping solutions for extreme high-temperature operations.

 

Our ASTM A312 TP310S pipes are available in both seamless (SMLS) and welded (WLD) configurations. They undergo full solution annealing at a temperature not lower than 1040°C (1900°F), followed by rapid quenching to ensure a uniform austenitic microstructure and optimal carbide solution status.

UNS S31008 stainless steel pipe is a high-alloy austenitic stainless steel containing 24.0%–26.0% chromium and 19.0%–22.0% nickel. Specifically engineered for severe high-temperature thermal environments, it exhibits exceptional oxidation resistance in continuous service up to 1150°C (2100°F), outperforming Grade 304 in temperature resistance by approximately 30%.

 

ASTM A312 TP310S stainless steel seamless pipes exhibit a minimum room-temperature tensile strength of 515 MPa, a minimum yield strength of 205 MPa, and a minimum elongation of 40%. Remarkably, even at an elevated temperature of 1000°C, they retain over 50% of their room-temperature tensile strength, delivering reliable load-bearing capacity for high-temperature operations.

 

GNEE supplies ASTM A312 TP310S seamless and welded pipes with an Outside Diameter (OD) range from 1/2" to 24" (21.3–609.6 mm) and wall thickness schedules from SCH 5S to SCH 160. The dimensional tolerances are held within ±1% for OD and ±10% for wall thickness. The products are available in standard single random lengths (SRL) of 5.8–6.1 meters, with custom lengths supported up to 12 meters. Value-added services include beveling, cutting, and heat treatment verification. Each shipment is accompanied by an EN 10204 3.1 Material Test Certificate (MTC) to ensure full material traceability; furthermore, Third-Party Inspection (TPI) by independent agencies such as SGS, BV, or TÜV can be arranged upon client request.

 

ASTM A312 TP310S High-Temperature Pipe Specification

 

ASTM A312 TP310S Stainless Steel Seamless Pipe Chemical Composition

Grade	C	Mn	Si	P	S	Cr	Ni
310S	0.08	2.00	1.50	0.045	0.030	24.0-26.0	19.0-22.0

 

ASTM A312 TP310S Stainless Steel Seamless Pipe Mechanical Properties

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
				Rockwell B (HR B) max	Brinell (HB) max
TP310S	515	205	40	95	217

 

ASTM A312 TP310S Stainless Steel Seamless Pipe Physical Properties

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (m/m/0C)			Thermal Conductivity (W/m.K)		Specific Heat 0-1000C (J/kg.K)	Electrical Resistivity (n.m)
			0-100°C	0-315°C	0-538°C	at 100°C	at 500°C
310S	7750	200	15.9	16.2	17.0	14.2	18.7	500	720

 

Equivalent Grade of TP310 TP310S Stainless Steel Pipe

Grade	UNS No	Euronorm		Swedish SS	Japanese JIS	GOST
		No	Name
310	S31000	1.4841	X15CrNi25-20	-	SUH 310	-
310S	S31008	1.4845	X8CrNi25-21	2361	SUS 310S	20х23н18

 

Tolerance for A312 Stainless Steel Seamless Tube Pipe

Standard	Outside Diameter Tolerance(mm)		Thickness Tolerance		Length Tolerance (mm)
ASTM A312	[10.29~48.26]	+0.4/-0.8	10.3~73	+20% / -12.5%	+6/-0
			88.9~457 T/D≤5%	+22.5%/-12.5%
	(48.26~114.30]	±0.80	88.9~457 T/D>5%	+15%/-12.5%
	(114.30~219.08]	+1.6/-0.8	508above T/D<5%	+22.5%/-12.5%
	(219.08~457.20]	+2.4/-0.8	508above T/D>5%	+15%/-12.5%

 

What is the maximum service temperature for TP310S piping?
Continuous operation: In an oxidizing atmosphere, the maximum oxidation resistance temperature for TP310S is 1150°C.
Intermittent operation: The recommended maximum temperature is 1040°C.

 

Applications of AISI 310S Heat-Resistant Pipes 

Thermal Processing and Furnaces: Widely used in radiant tubes, muffle covers, distillation retorts, annealing covers, and heat treatment baskets.
Petrochemicals and Refining: Applications include refinery furnace tube hangers, flare tips, and catalyst recovery piping systems. Power Generation: Used in coal gasifiers, fluidized bed combustors, pulverized coal burners, and steam boiler internals to transport high-temperature steam and combustion gases.
Cement and Steel Production: Utilized in high-temperature piping, wind boxes, and equipment exposed to abrasive dust or corrosive kiln gases.

 

 

Export Case Study: High-Temperature Instrumentation Pipes for a German Industrial Furnace Project

Product: ASTM A312 TP310S Seamless Heat-Resistant Stainless Steel Pipe.
Specification: DN 1/2" (NPS 1/2"), Schedule 80.
Application: High-pressure burner nozzles and temperature sensor protection sleeves in a secondary aluminum smelting furnace.
Operating Temperature: Constant 1,050°C, with peaks up to 1,120°C.

 

Description of the required products	Qty
Heat-resistant stainless steel tube, ASTM A312 AISI TP310S, DN 1/2", Schedule 80.	36

If you have requirements for 310S stainless steel pipes, we welcome your orders. GNEE maintains a large inventory of popular products for you to choose from. Please contact our factory today; we offer competitive prices and excellent service.

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Quality Control

PMI Testing (Material Identification): Mandatory to ensure Cr and Ni contents do not fall below the minimum limits.
Grain Size Testing: Ensures the grain size grade meets heat-resistance requirements.
Hydrostatic Test (Hydro Test): Verifies the sealing integrity of the pipe body under high-pressure conditions.
Ultrasonic/Eddy Current Testing: Inspects for internal cracks or slag inclusions within the pipe wall, particularly for seamless pipes.

Standard Packaging

Packaged in bundles or plywood cases, wrapped in plastic, and provided with appropriate protective measures to ensure suitability for seaworthy transport, or packed according to specific requirements.
Markings shall indicate whether the pipes are hot-worked or cold-worked and include, but are not limited to: standard, grade, dimensions, heat number, and batch number.

Item	Description
End Protection	Plastic End Caps
Packing	Export Wooden Cases
Shipping Protection	Waterproof Wrapping + Wooden Cases
Marking	Standard Mill Marking or Customized

FAQ

What does the "S" in TP310S stand for?
The "S" stands for "Low Carbon"; while TP310 has a maximum carbon content of 0.25%, the carbon content of TP310S is limited to below 0.08%.

 

Why does TP310S undergo "embrittlement" at high temperatures?
Phenomenon (Sigma Phase): When TP310S operates for extended periods within the 600°C–900°C range, a hard and brittle sigma (σ) phase precipitates within the microstructure, causing a sharp decline in the material's toughness.
Solution:
Avoid prolonged operation within this temperature range. If embrittlement has already occurred, high-temperature solution treatment at 1050°C–1150°C can be used to redissolve the sigma phase and restore the material's toughness.

 

What should be paid attention to when welding TP310S piping?

Due to its purely austenitic microstructure, low thermal conductivity, and high coefficient of thermal expansion, 310S is highly susceptible to hot cracking during welding.

To mitigate this, a low heat input welding technique must be employed, and matching high-quality welding consumables / filler metals (such as ER310 welding wire) should be selected. It is critical to ensure absolute cleanliness within the groove and joint area to prevent contaminants like sulfur (S) and phosphorus (P) from inducing cracking.