UNS S31009|1.4845|TP310H Seamless Stainless Steel Pipe

Seamless Stainless Steel TP310H Pipes (UNS S31009 / W.Nr. 1.4845) are premium high-alloy austenitic solutions specifically engineered for superior creep-rupture strength and oxidation resistance in extreme thermal environments. As a leading manufacturer based in Wenzhou, China, XinZhe produces high-integrity seamless piping that strictly adheres to ASTM A312, ASTM A213, and ASME SA213 international standards.

Distinguished by its optimized carbon content, our TP310H tubing offers enhanced mechanical properties and thermal stability at service temperatures up to 1100°C (2012°F). This makes them indispensable for mission-critical applications in boiler tubes, radiant coils, and refinery equipment. Through advanced cold-drawing and precise solution annealing, XinZhe ensures every pipe maintains a uniform grain structure and maximum resistance to high-temperature corrosion and scaling.

"The controlled carbon range (0.04-0.10%) in our TP310H pipes ensures higher creep strength compared to the low-carbon 310S version, making it ideal for continuous high-load thermal applications."

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What Is Seamless TP310H Pipe?

Seamless Stainless Steel TP310H Pipe

High Carbon Heat-Resistant Stainless Steel for Extreme Temperature Service

Product Overview

1. What is a Seamless TP310H Stainless Steel Pipe?

Seamless TP310H stainless steel pipe (UNS S31009 / W.Nr. 1.4845) is a high-carbon austenitic heat-resistant stainless steel pipe designed for extreme high-temperature service environments.

Manufactured via a seamless process (hot piercing + cold finishing) from a solid billet, TP310H offers:

Uniform microstructure
No weld seam defects
Superior pressure-bearing capability
Excellent reliability under thermal cycling

The “H” grade indicates a controlled higher carbon content (0.04%–0.10%), which significantly improves:

Additional Information

Creep rupture strength
High-temperature mechanical stability
Resistance to deformation under long-term stress

TP310H retains the excellent oxidation and scaling resistance of TP310, while providing enhanced structural strength for demanding high-temperature applications.

2. Key Features & Technical Advantages

Exceptional High-Temperature Strength (Up to 1150°C) Performs in continuous service up to 1150°C (2100°F) with excellent resistance to oxidation and scaling.

Superior Creep & Rupture Resistance Higher carbon content enhances creep strength, reducing deformation under sustained high-temperature stress.

Excellent Oxidation Resistance High chromium (24–26%) and nickel (19–22%) content forms a stable protective oxide layer in high-temperature air.

Resistance to Carburization & Sulfidation Performs well in carburizing, nitriding, and sulfur-bearing atmospheres, commonly found in industrial furnaces and petrochemical processes.

Seamless Structural Integrity Eliminates weld-related weaknesses, ensuring uniform corrosion resistance and mechanical reliability, in compliance with:

ASTM A312
ASME SA312

Good Fabrication Properties Despite its high alloy content, TP310H maintains good ductility and toughness, allowing bending, forming, and welding.

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for 310H stainless steel.

Table 1: Chemical Composition of Stainless Steel 310H

The composition of Stainless Steel 310H is carefully balanced to achieve its superior high-temperature strength and oxidation resistance.

Key Point: Thehigh Cr-Ni balance provides excellent resistance to oxidation, while the higher carbon content enhances high-temperature strength and creep resistance.

Table 2: Typical Mechanical Properties of Stainless Steel 310H

Stainless Steel 310H is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.

Table 3: Typical Physical Properties of Stainless Steel 310H

These physical properties highlight the material's ability to perform reliably under a wide range of conditions.

Table 4: The Standard of Stainless Steel Seamless Pipe Size Tolerance Size Chart :

6. Industrial Applications

TP310H seamless pipes are widely used in extreme high-temperature and high-stress environments, including:

Furnace & Heat Treatment Systems

Radiant tubes
Burner components
Furnace linings
Muffle tubes

Power Generation

Superheater tubes
Reheater tubes
Boiler support components

Petrochemical Industry

Fluid catalytic cracking (FCC) systems
Flare tips
Thermal processing units

Metallurgy & High-Temperature Processing

Kilns
Smelting furnaces
Heat treatment equipment

Waste & Environmental Systems

Incinerators
Combustion chambers
High-temperature exhaust systems

7. Advanced Manufacturing Process

High-Quality Raw Material Selection & Billet Heating
Rotary Piercing (Seamless Forming)
Cold Drawing / Cold Rolling for Precision Sizing
Solution Annealing Heat Treatment
Full Non-Destructive Testing (NDT)
Ultrasonic Testing (UT)
Eddy Current Testing (ET)
Hydrostatic Testing

8. 100% Quality Assurance & Certification

We ensure full compliance with global project standards:

EN 10204 3.1 / 3.2 Material Test Certificates (MTC)
100% PMI (Positive Material Identification)
Mechanical & Chemical Testing
Corrosion Testing:
Intergranular Corrosion (IGC)
Grain size analysis (ASTM E112)
Third-Party Inspection: ABS, TÜV, BV, DNV, SGS available

Tensile Strength	Yield Strength	Elongation	Hardness
≥ 515 MPa	≥ 205 MPa	≥ 35%	≤ 192 HBW

Density	Melting Point	Thermal Expansion	Thermal Conductivity	Modulus of Elasticity	Electrical Resistivity
7.9 g/cm³	1400 - 1450 °C approx.	16.5 µm/m·°C (20-100°C)	14.2 W/m·K (20°C)	200 GPa	0.78 x 10⁻⁶ Ω·m (20°C)

Chemical Composition

Cr	Ni	Mn	Si	P	S	Fe	C
24.00 - 26.00	19.00 - 22.00	≤ 2.00	≤ 1.00	≤ 0.045	≤ 0.030	Bal	0.04 - 0.10

Size Tolerance Chart

Standard	OD(D)	Tolerance （MM)		Thickness(S)	Tolerance(MM)	Length	Tolerance
	MM	Common	High	MM			MM
ASTM A312	D ≤48.3	+0.4/-0.8		10.3 ≤73	+20%-12.5%		+6.0/0
	48.3 ≤114.30	±0.8		88.9 ≤457.2,t/D ≤5%	+22.5%/-12.5%
	114.3 ≤219.1	+1.6/-0.8		88.9 ≤457.2,t/D >5%	+15%/-12.5%
	219.1 ≤457.2	+2.4/-0.8		D ≥508, t/D≤5%,SMLS	+22.5%/-12.5%
	457.2 ≤660.4	+3.2/-0.8		D ≥508, t/D>5%,SMLS	+15%/-12.5%
	660.4 ≤863.6	+4.0/-0.8		D ≥508, WELD	+17.5%/-12.5%
	863.6 ≤1219.2	+4.8/-0.8
JIS 3459 Hot-Finished Smls Pipe	D ＜50	±0.51		S ＜4	±0.5
	D ≥50	±1.0%		S ≥4	±12.5%
JIS 3459 Cold-Finished	D ＜30	±0.3		S ＜2	±0.2
	D ≥30	±1.0%		S ≥2	±10.0%
JIS G3463 Hot-Finished Smls Pipe	100	+0.4/-0.8		D ＜100， S	/	D	+7/0
				D ＜100， 2≤S	+40%/0	D	+10/0
				D ＜100， 2.4≤S	+35%/0
				D ＜100， 3.8≤S	+33%/0
				D ＜100， 4.6≤S	+28%/0	D	+13/0
	100 ≤D	+0.4/-1.2		D>100, S ＜2	/
	120 ≤D			D>100 ， 2≤S	/	D	+15/0
	160 ≤D	+0.4/-1.8		D>100 ， 2.4≤S	+35%/0
	200 ≤D	+0.4/-2.4		D>100 ， 3.8≤S	+33%/0	D>50,7	+10/0
				D>100 ， 4.6≤S	+28%/0
JIS G3463 Cold-finished		+0.4/-0.8		D	+0.4/0
	60 ≤D	±0.3		D ≥2.0	+20%/0	D>50,7	+13/0
	80 ≤D	±0.4		D ≥40	+22%/0
	100 ≤D	+0.4/-0.6
	120 ≤D	+0.4/-0.8				D>50,10M	+15/0
	160 ≤D	+0.4/-1.2
	200 ≤D	+0.4/-1.6
GB/T 14975 冷拔(扎)钢管	D	±0.3	±0.1	所有壁厚，普通级PA	+12.5%/-10%
	12.7		±0.15
	38.1	±0.4	±0.3
	88.9	±0.9%	±0.4
	139.7		±0.8	所有壁厚，高级PC	±10%
	203.2		±1.1
	219.1		±1.6
	D ≥323.9		±0.5%
GB/T 14976 冷拔(轧)钢管	6	±0.2	±0.15	S ≤3	±12%(10% /0 高级PC)
	10 ≤D	±0.2	±0.2
	30 ≤D	±0.2	±0.3	S>3	+12.5%/-10%(10%/0 高级PC)
	50 ≤D	0.85%	0.75%
	D>219	0.9%	0.8%	Smin, all	+22%/0(+20%/0 高级PC)

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Send your Seamless TP310H Pipe enquiry with grade, applicable ASTM/ASME standard and edition, OD × wall thickness, length, quantity, end finish, delivery destination and inspection documents — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.

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