TP309 Seamless Stainless Steel Tube

UNS S30900 | 1.4828 | ASTM A213

TP309 Seamless Stainless Steel Tube (S30900 / 1.4828) is manufactured to ASTM A213 from stainless steel billet, cold-drawn to the required outside diameter and wall thickness. Supplied from our Wenzhou mill with EN 10204 3.1 mill test certificate, PMI and dimensional inspection on request.

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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.

TP309 Key Features and Technical Advantages

Feature	Description
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.

TP309 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
Standard	MM	Common	High	MM	Tolerance(MM)	Length	MM
EN 10216-5 HFD	30≤D≤219.1（D2)	±1.0% or ±0.5mm, whicever is the greater		T1, T≤4	±15% or ±0.6mm, whicever is the greater	L≤6M	+5/0
	30≤D≤219.1（D2)	±1.0% or ±0.5mm, whicever is the greater		T2	±12.5% or ±0.4mm, whicever is the greater	L≤6M	+5/0
	219.1≤D≤610 (D1)	±1.5% or ±0.75mm, whicever is the greater		T≤0.05D	+22.5%/-15%	6＜l≤12	+10/0
				T1, 0.05D＜t≤0.09D	±15% or ±0.6mm, whicever is the greater	6＜l≤12	+10/0
				T2, T>0.09D	±12.5% or ±0.4mm, whicever is the greater	L>12	+by agreement/0
EN 10216-5 CFD	D3(D≤219.1)	±0.75% or ±0.3mm, whicever is the greater		T3	±10% or ±0.2mm, whicever is the greater
EN 10216-5 CFD	D4(D≤219.1)	±0.5% or ±0.mm, whicever is the greater		T4	±7.5% or ±0.15mm, whicever is the greater
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＜s≤3.8	+35%/0
		+0.4/-1.6		D＜100,3.8＜s≤4.6	+33%/0
		+0.4/-1.6		D＜100,S>4.6	+28%/0
	100＜d≤200	+0.4/-1.2		D>100, 2.4＜s≤3.8	+35%/0
	200＜d≤225	+0.4/-1.6		D>100,3.8＜s≤4.6	+33%/0
	200＜d≤225	+0.4/-1.6		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＜d＜50＜ span="">	±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＜d≤200	+0.38/-0.64
	200＜d≤225	+0.38/-1.14
ASTM A269	D≤13	±0.13		D≤13	±15%	D＜38	+3.2/0
	13＜d＜38＜ span="">	±0.13		13＜d＜356＜ span="">	±10%	D＜38	+3.2/0
	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		For CD SMLS pipe D≤38.1	+20%/0		+5.0/0
	140-200	±0.75		For CD SMLS pipe D>38.1	+22%/0
	200-300	±1.25		For CD SMLS pipe D>38.1	+22%/0

TP309 Dimensional Standards and Tolerances

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

Item	Details
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

Industry	Typical Applications
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

Industry	Typical 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

TP309 Quality Assurance and Production Process

Process Step	Description
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 About TP309 Seamless Stainless Steel Tubes

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.

Request a TP309 Tube 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