ASTM A312 TP310 SCH 40 Stainless Steel Round Pipe

If you are looking for industrial piping capable of operating stably over the long term under high temperatures above 1,000°C, oxidizing atmospheres, and thermal cycling conditions, ASTM A312 TP310 Round Pipe is a more reliable choice than 304, 316L, or even 309S.

 

ASTM A312 TP310 Stainless Steel Pipe Supplier,Manufacturer

 

GNEE supplies both ASTM A312 TP310/310S seamless and welded pipes, with outer diameters (OD) ranging from 6mm to 610mm and wall thicknesses supporting the full series from SCH 5S to XXS. The products are standardly delivered in a solution-annealed and pickled condition, with customized surface treatments available upon request, including bright annealing, internal/external polishing, and sandblasting. All products can be provided with EN 10204 3.1/3.2 material certificates and third-party inspections from SGS, BV, or TÜV.

 

 

The TP310 stainless steel pipes we supply are made of high-chromium-nickel austenitic heat-resistant steel, featuring a chromium content of 24.0%–26.0% and a nickel content of 19.0%–22.0%. Its continuous service antioxidant temperature reaches up to 1,035°C, with a short-term ultimate temperature resistance up to 1,150°C. At high temperatures, it forms a dense and stable protective oxide layer that effectively resists high-temperature scaling, carburization, and sulfur-bearing flue gas thermal corrosion. Furthermore, its tensile strength remains at approximately 400 MPa even at 600°C, making it ideal for industrial furnaces, heat treatment lines, and high-temperature flues.

TP310 vs. TP310S: How to Choose?

When working conditions involve welded structures, long-term operation within the sensitization temperature range of 650–900°C, or higher requirements for intergranular corrosion resistance, TP310S stainless steel pipe is highly recommended. As a low-carbon modified grade, 310S controls the carbon content to ≤0.08%, which significantly reduces the risk of carbide precipitation during welding and long-term high-temperature service. It is perfectly suited for heat exchangers, flue gas treatment equipment, incinerators, and high-temperature piping systems requiring extensive welding.

 

ASTM A312 TP310/310S pipe Chemical Composition

Grade	UNS	C (max)	Mn (max)	P (max)	S (max)	Si (max)	Cr	Ni
TP310	S31000	0.15%	2.00%	0.045%	0.030%	1.00%	24.0 – 26.0%	19.0 – 22.0%
TP310S	S31008	0.08%	2.00%	0.045%	0.030%	1.00%	24.0 – 26.0%	19.0 – 22.0%

 

ASTM A312 TP310/310S seamless pipe Mechanical Properties

Grade	Tensile Strength, min	Yield Strength (0.2% Offset), min	Elongation in 2 in. or 50mm, min	Hardness (Brinell) max	Hardness (Rockwell B) max
TP310	515 MPa (75 ksi)	205 MPa (30 ksi)	35%	192 HBW	90 HRB
TP310S	515 MPa (75 ksi)	205 MPa (30 ksi)	35%	192 HBW	90 HRB

 

ASTM A312 Dimensional Tolerances

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%

 

ASTM A312 TP310/310S Pipe Weight

Note: Theoretical weight is calculated using a density of 7.98 g/cm³ (0.288 lb/in³) due to the high Nickel and Chromium content in the 310 grade.

NPS (Inches)	OD (Inches)	OD (mm)	SCH 40 WT (Inches)	SCH 40 WT (mm)	Weight ( kg/m )	Weight (lb/ft)
1/2"	0.840	21.34	0.109	2.77	1.28	0.86
3/4"	1.050	26.67	0.113	2.87	1.71	1.15
1"	1.315	33.40	0.133	3.38	2.54	1.71
1-1/4"	1.660	42.16	0.140	3.56	3.44	2.31
1-1/2"	1.900	48.26	0.145	3.68	4.11	2.76
2"	2.375	60.33	0.154	3.91	5.52	3.71
2-1/2"	2.875	73.03	0.203	5.16	8.77	5.89
3"	3.500	88.90	0.216	5.49	11.47	7.71
3-1/2"	4.000	101.60	0.226	5.74	13.78	9.26
4"	4.500	114.30	0.237	6.02	16.32	10.97
5"	5.563	141.30	0.258	6.55	22.11	14.86
6"	6.625	168.28	0.280	7.11	28.69	19.28
8"	8.625	219.08	0.322	8.18	43.21	29.04
10"	10.750	273.05	0.365	9.27	61.22	41.14
12"	12.750	323.85	0.406	10.31	80.98	54.42

 

ASTM A312 TP310 round pipe HS Code

Product Description	HS Code	HS Code Description
ASTM A312 TP310 Seamless Stainless Steel Pipe	7304.49	Seamless tubes, pipes and hollow profiles, of stainless steel, other
ASTM A312 TP310 Welded Stainless Steel Pipe	7306.40	Welded tubes, pipes and hollow profiles, of stainless steel

 

ASTM A312 TP310 Stainless Steel Seamless Pipe Applications:

Furnace components (muffles, retort, conveyor belts).
Heat exchangers and boiler tubes.
Radiant tubes and steam boilers.
Petrochemical refinery equipment.
Cryogenic components 

If you're planning a purchase or project, tell me:What nominal pipe size (NB/OD) and length do you need?Do you prefer seamless or welded pipe?I can help you find specific availability or technical data.

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TP310 Stainless Steel pipe price per kg

The wholesale price of 310 stainless steel pipe ranges from $2.20 to $4.10 per kilogram (approximately $1,180 to $4,100 per tonne), whereas in local retail or domestic industrial markets, prices typically range from approximately $3.50 to $11.00 per kilogram, depending on the level of processing.

 

Quality Control

As TP310 is frequently used in hazardous high-temperature and high-pressure applications, the following tests are conducted prior to shipment:
PMI (Positive Material Identification) analysis
Hydrostatic test: Every pipe undergoes pressure testing.
Eddy Current or Ultrasonic Testing (UT): 100% non-destructive testing is typically required to ensure the absence of pinholes, cracks, or slag inclusions within the pipe wall.
Radiographic Testing (RT): For welded pipes, X-ray inspection of the weld seam is a critical focus.

High-Quality Packaging

End Protection: High-strength plastic caps are fitted to both ends to prevent dust from entering the inner walls and to protect the ends from impact-induced deformation.
Surface Wrapping:
Bright Annealed (BA) tubes: Individually sleeved in plastic bags, then packed in layers.
Pickled (AP) tubes: Fully wrapped in waterproof woven fabric or VCI anti-rust film.
Reinforced Wooden Crates: For heat exchanger tubes, GNEE mandates the use of fumigation-free plywood crates (compliant with ISPM-15 international export standards).

 

FAQ

Can TP310 be used in cryogenic environments, such as with liquid nitrogen?
Yes. TP310 stainless steel has an austenitic structure, offering excellent toughness and extremely low magnetic permeability even at very low temperatures (cryogenic conditions). Its low-temperature performance is actually superior to that of Grade 304.

 

Is it difficult to weld TP310 SCH 40 pipe?
TP310 has good weldability, but due to its high alloy content, the following points require attention:
Risk of hot cracking: Weld seams are prone to hot cracking, so interpass temperature must be strictly controlled.
Recommended welding consumables: Use matching ER310 welding wire or E310 welding electrodes.

 

Why is TP310 so much more expensive than 304?
It is primarily due to its very high nickel (Ni) and chromium (Cr) content. Grade 304 contains approximately 8% nickel, whereas Grade 310 contains 19–22% (almost 2.5 times that of 304). Nickel and chromium are expensive metals that directly determine raw material costs.