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TP309 TP309S TP309H (UNS30900) 1.4828 1.4833 SEAMLESS STAINLESS STEEL PIPE AND TUBE

TP309S 1.4833 SEAMLESS STAINLESS STEEL PIPE AND TUBE

①STANDARD: ASTM A213/ ASTM A312/ ASTM A249/ ASTM A269/ GOST 9940 /GOST 9941...
②OD RANGE : 6-1016 MM
③THICKNESS RANGE: 1-65 MM

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Introduction

Product Introduction

TP309S (UNS S30908, EN 1.4833) is a premium austenitic stainless steel renowned for its exceptional high-temperature resistance and corrosion performance. As a low-carbon variant of the TP309 alloy, TP309S features a carbon content ≤0.08%, significantly reducing the risk of carbide precipitation during welding compared to its standard counterpart. This makes it ideal for applications requiring both high-temperature durability and reliable weldability.

Manufactured to rigorous standards including ASTM A213, ASTM A312, and GOST, TP309S seamless pipes and tubes undergo a precision production process to ensure uniform wall thickness, superior mechanical properties, and consistent performance. The alloy’s high chromium (22.00–24.00%) and nickel (12.00–15.00%) content forms a stable oxide layer, providing excellent oxidation resistance and corrosion protection in harsh environments.

Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. delivers TP309S products that meet the highest quality benchmarks, offering customers reliable solutions for applications ranging from industrial furnaces to power generation systems.

Main Product Parameters

Chemical Composition

Grade	C	Si	Mn	Cr	Ni	P	S	Mo
TP309S	≤0.08	≤1.00	≤2.00	22.00–24.00	12.00–15.00	≤0.045	≤0.03	≤0.75

Mechanical Properties

Grade	Tensile Strength (Ksi/MPa)	Yield Strength (Ksi/MPa)	Elongation (%)	Hardness (Brinell/Vickers)	Hardness (Rockwell)
TP309S	≥75/515	≥30/205	≥35	≤192HBW/200HV	≤90HRB

Physical Properties

Property	Value
Density	7.93 g/cm³
Melting Point	1399–1454°C
Thermal Conductivity	15.9 W/m·K (100°C)
Electrical Resistivity	78.0 μΩ·cm
Thermal Expansion	16.0 μm/m·°C (20–100°C)
Elastic Modulus	193 GPa

Dimensions

Outer Diameter: 6–1016 mm
Wall Thickness: 1–65 mm
Custom lengths available upon request

Product Features

Exceptional High-Temperature Resistance

TP309S demonstrates outstanding oxidation resistance up to 1038°C (1900°F) under non-cyclic conditions, making it suitable for continuous high-temperature service. Its stable austenitic structure maintains mechanical strength in furnace components, heat exchangers, and other heat-intensive applications where lower-alloy steels might fail.

Superior Weldability

The low carbon content of TP309S minimizes carbide precipitation in the heat-affected zone (HAZ) during welding, ensuring:

Maintained corrosion resistance post-welding
Reduced risk of intergranular corrosion
Compatibility with standard welding techniques (TIG, MIG, stick welding) without specialized preheating

Corrosion Resistance in Diverse Media

Oxidizing Environments: Resists corrosion in dilute acids, atmospheric conditions, and alkaline solutions better than 304 stainless steel.
Sulfur-Containing Atmospheres: The alloy’s composition allows use in sulfurous environments up to 1000°C (1832°F), making it suitable for flue gas systems.
General Corrosion: Exhibits good resistance to water, steam, and many organic compounds, ideal for food and pharmaceutical applications.

Mechanical Stability Across Temperatures

TP309S maintains significant tensile strength (≥515 MPa) and elongation (≥35%) across a wide temperature range, from ambient to high-service temperatures. This ensures structural integrity in components subjected to thermal stress, such as boiler tubes and exhaust systems.

Application Scenarios

Power Generation

Boiler Systems: Superheater and reheater tubes in power plant boilers.
Steam Pipelines: High-pressure steam headers and transport lines.
Flue Gas Desulfurization (FGD): Ductwork and scrubbers for removing sulfur dioxide.

Industrial Furnaces & Heat Treatment

Furnace Components: Burners, radiant tubes, and retorts for heat-treating processes.
Heat Exchangers: Equipment for transferring thermal energy in petrochemical plants.
Incinerators: Linings and structural parts for waste treatment facilities.

Automotive & Aerospace

Exhaust Systems: Manifolds and pipes in high-performance vehicles and aircraft engines.
Aftertreatment Devices: Components for diesel engine exhaust gas recirculation (EGR) systems.

Chemical Processing

Reactors & Vessels: Equipment for handling oxidizing chemicals and high-temperature reactions.
Heat Transfer Systems: Condensers and evaporators in chemical synthesis processes.

Food & Pharmaceutical Industries

High-Temperature Processing: Sterilization equipment and steam pipes in food manufacturing.
Hygienic Systems: Tubing for pharmaceutical production requiring corrosion resistance and cleanliness.

FAQ

What is the difference between TP309 and TP309S?

Carbon Content: TP309 has ≤0.20% carbon, while TP309S has ≤0.08%, reducing carbide precipitation during welding.
Weldability: TP309S offers superior weldability and post-weld corrosion resistance, making it ideal for fabricated components.
Application Focus: TP309 is suitable for general high-temperature use, while TP309S is preferred for welded structures requiring corrosion resistance.

Can TP309S be used in carburizing environments?

No—TP309S has moderate resistance to carbon absorption and is not recommended for highly carburizing atmospheres. Alloys with higher chromium content or specific carburization resistance are more suitable for such applications.

What is the maximum continuous service temperature for TP309S?

TP309S can withstand continuous service up to 1038°C (1900°F) under non-cyclic conditions. In sulfur-containing atmospheres, the maximum temperature is reduced to 1000°C (1832°F) to maintain corrosion resistance.

Is TP309S magnetic?

Like other austenitic stainless steels, TP309S is non-magnetic in its annealed condition. Cold working may induce slight magnetism due to martensitic transformation, but it remains primarily non-magnetic.

How does TP309S compare to 304 stainless steel?

TP309S has a higher chromium (22–24%) and nickel (12–15%) content than 304 (18–20% Cr, 8–10.5% Ni), offering:

Superior high-temperature oxidation resistance
Better strength at elevated temperatures
Improved resistance to sulfur-based corrosion

What welding procedures are recommended for TP309S?

Use 309L or 310 stainless steel filler metals to match the alloy’s composition. Control heat input to avoid grain growth, and consider post-weld annealing for critical components to restore optimal ductility.

Does TP309S require special surface treatment?

Standard pickling or bright annealing is sufficient for most applications. Polishing can be applied for aesthetic purposes or to enhance corrosion resistance in hygienic environments.

What certifications are provided with TP309S products?

Standard mill test certificates are included, and 3.2 Certification is available upon request to meet specific industry standards such as ASTM or GOST.