UNS S31008|1.4845|TP310S Seamless Stainless Steel Tube

TP310S (UNS S31008) Seamless Stainless Steel Tube Manufacturer & Supplier | Xinzhe China
Xinzhe is a premier manufacturer and global exporter of TP310S (UNS S31008) seamless stainless steel tubes, headquartered in Wenzhou, China. As a low-carbon version of the 310 alloy, TP310S is specifically engineered to provide superior oxidation resistance and structural integrity in continuous service temperatures up to 1035°C (1900°F).
Our SS 310S seamless tubing is manufactured using advanced cold-drawing and cold-rolling processes to meet the most stringent international standards, including ASTM A213, ASTM A269, and EN 10216-5. By controlling the carbon content, we ensure our tubes offer enhanced weldability and resistance to intergranular corrosion, making them the ideal choice for high-heat industrial infrastructure.
Technical Specifications: TP310S (UNS S31008 / 1.4845)
TP310S features a high Chromium (25%) and Nickel (20%) composition, providing a stable austenitic structure and excellent resistance to thermal fatigue.

Technical Parameter Specification & Range
Outer Diameter (OD) 6.0mm to 508mm
Wall Thickness (WT) 0.5mm to 40mm (SCH 10S - SCH XXS)
Standard Compliance ASTM A213 (Exchanger), ASTM A312 (Pipe), DIN 17458
Surface Finish Solution Annealed & Pickled (AP), Bright Annealed (BA), Polished
Testing 100% Hydrostatic, Eddy Current, PMI, and Grain Size Testing

Key Performance Benefits of Xinzhe TP310S Tubes
• Superior Oxidation Resistance: The high chromium content allows for the formation of a protective, adherent oxide scale in oxidizing environments.
• Low Carbon Advantage: Specifically designed to minimize carbide precipitation during welding or high-temperature exposure, preventing sensitization.
• Resistance to Sulfidation: Excellent performance in moderately carburizing and sulfidizing atmospheres compared to lower-alloyed stainless steels.
• High-Precision Manufacturing: Our Wenzhou facility ensures tight dimensional tolerances and superior internal surface

Quantity:

Contact Now

What Is a Seamless Stainless Steel TP310S Tube?

TP310S (UNS S31008) is the low-carbon version of the 25Cr-20Ni austenitic grade, limited to a maximum of 0.08% carbon. Lower carbon minimises carbide precipitation during welding and high-temperature service, which preserves intergranular corrosion resistance in the heat-affected zone and makes TP310S easier to fabricate.

Stainless Steel 310S seamless tubes are high-temperature, corrosion-resistant tube crafted from a single, solid billet of a high-chromium and high-nickel austenitic stainless steel. It is manufactured without a weld joint, ensuring superior structural integrity and reliability, especially under high-stress and high-temperature conditions. The"310S"designation refers to a specific grade that is a low-carbon version of Stainless Steel 310. This lower carbon content minimizes the formation of chromium carbide precipitates during welding and subsequent exposure to temperatures in the sensitization range (800-1500°F or 425-816°C). This makes it a preferred choice for applications where the full corrosion resistance of the material needs to be maintained in the welded condition.

Key Features and Technical Advantages

Excellent Oxidation Resistance

25% chromium and 20% nickel create a protective oxide layer that resists scaling and spalling in continuous service up to about 1,050 °C.

Low Carbon, Better Weldability

A maximum carbon of 0.08% reduces carbide precipitation at grain boundaries, preserving intergranular corrosion resistance in the heat-affected zone.

Good Creep Strength

Even in the low-carbon form, TP310S retains useful strength at elevated temperature for moderately loaded components.

Resistance to Sulfidation and Carburization

The high alloy content resists attack in sulphur-bearing and carbon-rich process atmospheres.

Suitable for Cyclic Thermal Service

The fully austenitic structure tolerates repeated thermal cycling with good dimensional stability.

Product Specifications and Data

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Stainless Steel 310S.

The composition of Stainless Steel 310S is carefully balanced to achieve its superior high-temperature stability and corrosion resistance.

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	≤ 0.08

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

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

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

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)

Standard	OD(D)	Tolerance（MM)		Thickness(S)	Tolerance(MM)	Length	Tolerance
	MM	Common	High	MM			MM
EN 10216-5 HFD	30≤D≤219.1（D2)	±1.0% or ±0.5mm, whicever is the greater(取较大者)		T1, T≤4	±15% or ±0.6mm, whicever is the greater(取较大者)	L≤6M	+5/0
				T2	±12.5% or ±0.4mm, whicever is the greater(取较大者)
	219.1≤D≤610 (D1)	±1.5% or ±0.75mm, whicever is the greater (取较大者)		T≤0.05D	+22.5%/-15%	6≤12	+10/0
				T1, 0.05D≤0.09D	±15% or ±0.6mm, whicever is the greater(取较大者)
				T2, T>0.09D	±12.5% or ±0.4mm, whicever is the greater(取较大者)	L>12	+by agreement/0
EN 10216-5 CFD	D3(D≤219.1)	±0.75% or ±0.3mm, whicever is the greater(取较大者)		T3	±10% or ±0.2mm, whicever is the greater(取较大者)
	D4(D≤219.1)	±0.5% or ±0.mm, whicever is the greater(取较大者)		T4	±7.5% or ±0.15mm, whicever is the greater(取较大者)
ASTM A213 HFD	D≤100	+0.4/-0.8		D<100,S≤2.4	+40%/0	HFD, all size	+5.0/0
		+0.4/-1.2		D<100,2.4≤3.8	+35%/0
		+0.4/-1.6		D<100,3.8≤4.6	+33%/0
				D<100,S>4.6	+28%/0
	100≤200	+0.4/-1.2		D>100, 2.4≤3.8	+35%/0
	200≤225	+0.4/-1.6		D>100,3.8≤4.6	+33%/0
				D>100,S>4.6	+28%/0
ASTM A213 CFD	D<25	±0.10		D≤38.1	+20%/0	CFD, D<50.8	+3.0/0
	25≤D≤40	±0.15
	40	±0.20
	50≤D<65	±0.25
	65≤D<75	±0.30		D>38.1	+22%/0	CFD, D≥50.8	+5.0/0
	75≤D≤100	±0.38
	100≤200	+0.38/-0.64
	200≤225	+0.38/-1.14
ASTM A269	D≤13	±0.13		D≤13	±15%	D<38	+3.2/0
	13	±0.13		13	±10%
	38≤D<89	±0.25				D>38	+4.8/0
	89≤D<140	±0.38
	140≤D<203	±0.76
	203≤D<305	±1.01
	305≤D<356	±1.26
ASTM A270	D<25	±0.13		For weld pipe all size	±12.5%		+3.0/0
	25-50	±0.20
	50-75	±0.25
	75-100	±0.38		For CD SMLS pipe D≤38.1	+20%/0
	100-140	±0.38					+5.0/0
	140-200	±0.75		For CD SMLS pipe D>38.1	+22%/0
	200-300	±1.25

Dimensional Standards and Tolerances

TP310S seamless tubes are supplied to the dimensional tolerances of ASTM A213 / A1016 unless a tighter project specification applies.

Common Industrial Applications

Heat Treating Industry

Radiant tubes, muffles and retorts
Furnace internals
Heat-treatment fixtures

Power Generation

Boiler and superheater components
Reheater tubing
Steam generator parts

Chemical and Petrochemical Processing

Furnace tubing and burner parts
High-temperature piping
Reactor internals

Cement and Lime Industry

Kiln components
High-temperature process equipment
Preheater and calciner parts

Quality Assurance and Manufacturing Process

Certification

All TP310S tubes are supplied to ASTM A213 / ASME SA213 and ASTM A312 / ASME SA312 with EN 10204 3.1 mill test certificates. Third-party inspection (SGS, BV, TUV, Lloyd's), PMI reports and full heat-number traceability can be provided on request.

Non-Destructive Testing (NDT)

Hydrostatic or eddy-current testing is performed on 100% of tubes. Ultrasonic testing (UT) and dye-penetrant inspection (PT) are available for critical service, with records retained for each production lot.

Material Verification

Positive Material Identification (PMI) and spectrometric analysis confirm that the chemical composition matches the ordered grade. Intergranular corrosion (IGC) testing to ASTM A262 Practice E is available for austenitic and nickel-alloy tubes.

Mechanical Testing

Tensile, yield, elongation and hardness tests are carried out per heat. Flattening, flaring and reverse-bend tests verify ductility, while creep-rupture data can be supplied for high-temperature grades.

Dimensional Inspection

Outside diameter, wall thickness, ovality and straightness are measured against ASTM A1016 / A1016M or EN 10216-5 tolerances. Length, square-cut ends and end-finish conditions are verified before packing.

TP310S vs TP310 / TP310H – Technical Comparison

TP310S is the low-carbon member of the 25Cr-20Ni family. Comparing it with TP310 and TP310H comes down to how much carbon the application can tolerate.

Carbon Content and Consequence

TP310S: 0.08% C maximum — minimal carbide precipitation, best weldability
TP310: up to 0.25% C — higher strength but sensitisation risk in the HAZ
TP310H: 0.04–0.10% C — controlled carbon for creep strength

Intergranular Corrosion Resistance

With carbon held to 0.08% maximum, TP310S avoids the chromium-depletion mechanism that causes intergranular attack after welding. This makes it the preferred choice for fabricated equipment that cannot be solution-annealed.

High-Temperature Strength

The lower carbon does reduce creep strength relative to TP310H. Where the component is creep-limited rather than fabrication-limited, TP310H will usually allow a thinner wall.

Selection Guide

Choose TP310S where welded fabrication and intergranular corrosion resistance drive the design
Choose TP310H where creep strength at temperature governs the wall thickness
Both share the same oxidation resistance limit of roughly 1,050 °C

Frequently Asked Questions

What is TP310S seamless tube?

TP310S (UNS S31008) is the low-carbon version of the 25Cr-20Ni austenitic stainless steel grade, with a maximum carbon content of 0.08%. Lower carbon reduces carbide precipitation and preserves intergranular corrosion resistance after welding.

What is the difference between TP310S and TP310H?

TP310S holds carbon at or below 0.08% to maximise weldability and intergranular corrosion resistance. TP310H controls carbon in the 0.04–0.10% range to maximise creep and stress-rupture strength. The choice depends on whether fabrication or creep strength governs the design.

What standard covers TP310S seamless tube?

TP310S is supplied to ASTM A213 / ASME SA213 and ASTM A312 / ASME SA312, with European equivalents available where the project specifies EN 10216-5.

What is TP310S tube used for?

TP310S is used for welded high-temperature equipment including furnace internals, heat exchangers and boiler components, and for chemical and petrochemical service where good oxidation resistance and easy fabrication are both required.

Ready to Request a Quotation?

Send your Seamless Stainless Steel TP310S Tube enquiry with grade, application, size (OD and wall thickness or schedule), quantity, length, end finish and inspection requirements. Our technical team will confirm availability, testing scope and lead time.

Request a TP310S Tube Quotation

Recommend Products