A213 TP309 Seamless Stainless Steel Tube

UNS S30900|1.4828|TP309 Seamless Stainless Steel Tube

Seamless Stainless Steel TP309 Tubes (UNS S30900 / W.Nr. 1.4833) are high-alloy austenitic solutions engineered for exceptional oxidation resistance and structural integrity in extreme thermal environments. As a premier manufacturer based in Wenzhou, China, XinZhe produces high-integrity seamless tubing that strictly complies with ASTM A213, ASTM A312, and ASME SA213 international standards.

Distinguished by its high Chromium (22-24%) and Nickel (12-15%) content, our TP310MoLN tubing offers superior creep strength and thermal stability at continuous service temperatures up to 1038°C (1900°F). These tubes are indispensable for mission-critical components in industrial furnaces, boiler baffles, and thermo-wells. Through advanced cold-drawing and precise solution annealing, XinZhe ensures a stable austenitic microstructure that maintains maximum durability under aggressive thermal cycling and mildly carburizing atmospheres.

"While TP310S offers higher heat resistance, TP309 provides a more cost-effective solution for environments up to 1900°F, especially in sulfur-bearing atmospheres where its corrosion resistance is superior."

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What Is a Seamless Stainless Steel TP309 Tube?

TP309 (UNS S30900 / W.Nr. 1.4828) is a high-chromium, high-nickel austenitic stainless steel developed for elevated-temperature service. With 22–24% Cr and 12–15% Ni it significantly outperforms standard 18-8 grades in oxidation resistance and high-temperature strength, while its higher nickel content helps maintain a stable austenitic structure and good weldability.

Seamless TP309 Stainless Steel Tube (UNS S30900 / 1.4828)

High-Temperature Oxidation Resistant Stainless Steel Tube | ASTM A213 / EN 10216-5

What is TP309 Seamless Stainless Steel Tube?

TP309 (UNS S30900 / W.Nr. 1.4828) is a high-chromium, high-nickel austenitic stainless steel specifically designed for high-temperature oxidation resistance and thermal stability.

With elevated alloy content (Cr 22–24%, Ni 12–15%), TP309 significantly outperforms standard grades such as 304 and 316 in high-temperature and scaling environments.

Key Features and Technical Advantages

Superior Oxidation Resistance

With 22–24% chromium, TP309 forms a protective oxide that resists scaling at temperatures up to about 1,000 °C, significantly outperforming standard 18-8 grades.

High-Temperature Strength

TP309 maintains useful mechanical strength at elevated temperature, making it suitable for furnace internals and heat-treatment fixtures.

Higher Nickel for Structural Stability

12–15% nickel keeps the structure fully austenitic, preserving toughness and avoiding the phase changes that embrittle ferritic grades.

Good Weldability and Formability

The grade is readily welded and formed, and is often used as a dissimilar-metal filler or transition material.

Resistance to Carburization

TP309 resists carburization in carbon-rich atmospheres common to reforming and heat-treating furnaces.

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 309.

The composition of Stainless Steel 309 is carefully balanced to achieve its superior high-temperature oxidation resistance and strength.

Cr	Ni	Mn	Si	P	S	Fe	C
22.00 - 24.00	12.00 - 15.00	≤ 2.00	≤ 1.50	≤ 0.045	≤ 0.030	Bal	≤ 0.20

Stainless Steel 309 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	≥ 30%	≤ 217 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

TP309 seamless tubes are supplied to the dimensional tolerances of ASTM A213 / A1016 or EN 10216-5 as specified.

Standards & Specifications

Applicable Standards

ASTM A213 (boiler & heat exchanger tubes)
ASTM A269 (general service tubing)
EN 10216-5 (pressure purposes)

Delivery Conditions

Annealed & Pickled (AP)
Bright Annealed (BA)

Typical Applications of TP309 Tubes

Industrial Furnaces

Radiant tubes
Furnace linings
Mufflers and conveyors

Petrochemical Industry

Flare systems
Catalytic recovery units
High-temperature heat exchangers

Power Generation

Boiler components
Coal handling systems

Waste & Environmental Systems

Incinerators
Kilns
Combustion chambers

Cement Industry

Burner pipes
Kiln internals

Common Industrial Applications

Heat Treating and Furnace Industry

Radiant tubes and muffles
Furnace internals and supports
Heat-treatment fixtures

Petrochemical Processing

Furnace tubing and burner parts
Reformer and cracker internals
High-temperature piping

Power Generation

Boiler and superheater components
Reheater tubing
Steam generator parts

Dissimilar-Metal Transition Joints

Transition pieces in mixed-material piping
Welding filler for high-temperature joints
Cladding back-up layers

Quality Assurance and Manufacturing Process

Certification

All TP309 tubes are supplied to ASTM A213 / ASME SA213 and EN 10216-5 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.

TP309 vs TP310 / TP304H – Technical Comparison

TP309 occupies the middle ground of the high-temperature austenitic family: higher alloy than 18-8 grades, but more economical than the 25Cr-20Ni grades.

Chemical Composition

TP309: 22–24% Cr, 12–15% Ni
TP310: 24–26% Cr, 19–22% Ni
TP304H: 18–20% Cr, 8–11% Ni with 0.04–0.10% C

Oxidation Resistance

TP309 resists scaling to about 1,000 °C. TP310 extends that to roughly 1,050 °C because of its higher chromium and nickel. TP304H is limited to about 800 °C in continuous service.

Nickel Content and Economics

TP309 carries less nickel than TP310, which lowers cost but also reduces structural stability in the most severe duty. Where the temperature is moderate and cost matters, TP309 is often the practical compromise.

Selection Guide

Choose TP309 for moderately elevated temperature where 18-8 grades fall short but 25-20 grades are not required
Choose TP310 for the most severe oxidation duty
Choose TP304H for creep-limited service at more moderate temperature

Frequently Asked Questions

What is TP309 seamless tube?

TP309 (UNS S30900 / W.Nr. 1.4828) is a high-chromium, high-nickel austenitic stainless steel tube produced without a longitudinal weld. With 22–24% Cr and 12–15% Ni it substantially outperforms standard 18-8 grades at elevated temperature.

How does TP309 compare with TP310?

TP310 carries more chromium and substantially more nickel (24–26% Cr, 19–22% Ni), which extends its oxidation limit to about 1,050 °C. TP309 is limited to roughly 1,000 °C but is more economical, making it the practical middle ground between 18-8 and 25-20 grades.

What standard covers TP309 seamless tube?

TP309 is supplied to ASTM A213 / ASME SA213 and EN 10216-5, with ASTM A312 / ASME SA312 available where pipe dimensions apply.

What is TP309 tube used for?

TP309 is used for radiant tubes and furnace internals, high-temperature petrochemical furnace tubing, boiler components, and as a transition or filler material when joining dissimilar high-temperature alloys.

Ready to Request a Quotation?

Send your Seamless Stainless Steel TP309 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 TP309 Tube Quotation

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