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For applications requiring high-temperature strength, good corrosion resistance, and moderate weldability, ASME SA240/ASTM A240 UNS S30909 Stainless Steel Sheet (commonly known as 309H) is a reliable choice.
As a leading uns stainless supplier, Gangsteel specializes in providing high-quality sa 240/a 240 uns s30909 sheets, plates, coils, bars, and custom components, all compliant with sa 240/a 240 uns stainless grades standards, including ASTM A240 and ASME SA240. With an inventory exceeding 600 tons and advanced manufacturing capabilities, Gangsteel ensures rapid delivery and tailored solutions for clients worldwide.
Gangsteel explores the ASME SA240/ASTM A240 UNS S30909 chemical composition, density, mechanical properties, corrosion resistance, weldability, stainless steel surface finishes, equivalent materials, specifications, applications, and competitive ASME SA240/ASTM A240 UNS S30909 price per kg. Whether you're an engineer designing heat exchanger components or a procurement specialist sourcing for furnace applications, this article will clarify why 309H stainless steel (UNS S30909) is a trusted option. Explore our sa 240/a 240 uns stainless grades portfolio for related grades like sa 240/a 240 uns s30615, sa 240/a 240 uns s30815, sa 240/a 240 uns s30940, sa 240/a 240 uns s31040, sa 240/a 240 uns s31041, sa 240/a 240 uns s31050, and sa 240/a 240 uns s31060.
ASME SA240/ASTM A240 UNS S30909, known as 309H, is an austenitic stainless steel with 22.0-24.0% chromium, 12.0-15.0% nickel, and 0.04-0.10% carbon. It is designed for high-temperature applications requiring robust strength, good corrosion resistance, and moderate weldability, making it ideal for industries such as power generation, petrochemical, and furnace manufacturing. The high chromium and nickel content provide excellent oxidation resistance up to 1000°C (1832°F), while the elevated carbon content enhances high-temperature strength compared to sa 240/a 240 uns s30940.
The ASME SA240/ASTM A240 UNS S30909 stainless steel sheet offers superior high-temperature strength compared to sa 240/a 240 uns s30615 but is less oxidation-resistant than sa 240/a 240 uns s30815 due to the absence of cerium. While it is less corrosion-resistant in highly aggressive environments than grades like sa 240/a 240 uns s31050, its high-temperature strength and cost-effectiveness make it a preferred choice for heat exchanger and furnace applications.
Key benefits of ASME SA240/ASTM A240 UNS S30909 stainless steel sheet include:
Case Study: A furnace manufacturer in India used sa 240/a 240 uns s30909 sheets for heat exchanger components, achieving a 20% cost reduction compared to sa 240/a 240 uns s30815 while maintaining reliable high-temperature performance.
Keywords: ASME SA240/ASTM A240 UNS S30909 stainless steel sheet, UNS S30909 sheet, 309H stainless steel, high-temperature stainless steel sheet
The density of ASME SA240/ASTM A240 UNS S30909 stainless steel sheet is approximately 7.89 g/cm³ (0.285 lb/in³). This density is typical for high-chromium austenitic stainless steels and reflects the material's composition, which includes elevated chromium and nickel content. The consistent density ensures predictable performance in applications requiring precise weight calculations, such as heat exchangers and furnace components. Compared to grades like sa 240/a 240 uns s30815 (7.80 g/cm³) and sa 240/a 240 uns s31050 (7.89 g/cm³), the density is similar, making UNS S30909 a reliable choice for weight-sensitive high-temperature applications.
Keywords: ASME SA240/ASTM A240 UNS S30909 density, UNS S30909 density, 309H density
ASME SA240/ASTM A240 UNS S30909offers good corrosion resistance in high-temperature and moderately corrosive environments, such as furnace and petrochemical settings. Its 22.0-24.0% chromium and 12.0-15.0% nickel content provide a robust protective oxide layer, with a pitting resistance equivalent number (PREN) of ~22-24, suitable for applications like heat exchanger tubes and furnace components. It outperforms sa 240/a 240 uns s30615 in high-temperature environments but is less corrosion-resistant than molybdenum-containing grades like sa 240/a 240 uns s31050 in highly aggressive conditions. For chloride-rich environments, grades like sa 240/a 240 uns s31254 are recommended.
Keywords: ASME SA240/ASTM A240 UNS S30909 corrosion resistance, UNS S30909 corrosion properties, 309H corrosion resistance
The carbon content (0.04-0.10%) of ASME SA240/ASTM A240 UNS S30909 provides moderate weldability, with a higher risk of carbide precipitation compared to low-carbon grades like sa 240/a 240 uns s30940. It can be welded using techniques such as TIG, MIG, and shielded metal arc welding, with proper filler materials (e.g., 309H-specific fillers) and low heat input to minimize sensitization and intergranular corrosion. Compared to sa 240/a 240 uns s30815, UNS S30909 is less weldable but more cost-effective for high-temperature applications. For superior weldability, sa 240/a 240 uns s31050 is a better choice.
Keywords: ASME SA240/ASTM A240 UNS S30909 weldability, UNS S30909 welding properties, 309H weldability
The surface finish of ASME SA240/ASTM A240 UNS S30909 stainless steel sheet significantly impacts its aesthetic appeal, functionality, and application suitability. Gangsteel offers a variety of surface finishes to meet diverse project requirements, as detailed below:
|
Surface Finish |
Definition/Feature |
Summary of Manufacturing Method |
Application/Use |
|---|---|---|---|
|
NO.1 |
Silver white, matte |
Hot rolled to specified thickness, followed by heat treatment and pickling |
Chemical tank, pipe, no need for surface gloss purposes |
|
2B |
Stronger gloss than NO.2D |
Cold rolled, heat treated, pickled, and lightly cold rolled by polishing rollers |
Medical equipment, food industry, construction material, kitchen utensils, general materials |
|
NO.2D/2BB |
Silver white |
Heat treatment and pickling after cold rolling |
General materials, deep drawing materials |
|
NO.3 |
Rough grinding |
Polished with No.100 to No.120 abrasives (JIS R6001) or 100~200# grinding belt |
Kitchen utensils, building construction, building materials |
|
NO.4 (4K) |
Intermediate grinding |
Polished with No.150 to No.180 abrasives (JIS R6001) or 150~180# stone abrasive belt |
Kitchen utensils, building construction, medical equipment, building materials |
|
NO.240 |
Fine grinding |
Grinding with 240# stone abrasive belt |
Kitchenware |
|
NO.320 |
Very fine grinding |
Grinding with 320# abrasive belt |
Kitchenware |
|
NO.400 |
Gloss close to BA |
Grinding with 400# polishing wheel |
General timber, construction timber, kitchen utensils |
|
HL |
Hairline grinding, continuous polishing streaks |
Polished with suitable grain size abrasive (150~240#) for hairline grinding |
Building construction, buildings, construction materials |
|
BA (No.6/BA1/BA0) |
Bright as a mirror |
Bright heat treatment after cold rolling, high surface reflectivity |
Kitchen utensils, electric equipment, building construction, building materials |
|
NO.7 |
Close to mirror polishing |
Grinding with 600# rotary polishing wheel |
For art and decoration |
|
NO.8 (Mirror/8K) |
Shining like a mirror |
Grinding mirrors with polishing wheels |
Building construction, reflector, for decoration |
These surface finishes allow sa 240/a 240 uns s30909 to be tailored for aesthetic or functional requirements, such as the NO.1 finish for furnace components or the 2B finish for heat exchanger applications.
Keywords: ASME SA240/ASTM A240 UNS S30909 surface finish, UNS S30909 stainless steel surface, 309H surface finishes
The ASME SA240/ASTM A240 UNS S30909 chemical composition is optimized for high-temperature strength and corrosion resistance, compliant with sa 240/a 240 uns stainless grades standards.
The high chromium (22.0-24.0%) and nickel (12.0-15.0%) content provide excellent oxidation resistance, while the elevated carbon content (0.04-0.10%) enhances high-temperature strength compared to sa 240/a 240 uns s30940.
|
Element |
Percentage (%) |
|---|---|
|
Chromium (Cr) |
22.0 – 24.0 |
|
Nickel (Ni) |
12.0 – 15.0 |
|
Carbon (C) |
0.04 – 0.10 |
|
Manganese (Mn) |
≤ 2.0 |
|
Silicon (Si) |
≤ 0.75 |
|
Phosphorus (P) |
≤ 0.045 |
|
Sulfur (S) |
≤ 0.030 |
|
Iron (Fe) |
Balance (~60%) |
Keywords: ASME SA240/ASTM A240 UNS S30909 chemical composition, UNS S30909 composition, 309H chemistry, ASME SA240 Gr S30909 composition
The ASME SA240/ASTM A240 UNS S30909 mechanical properties offer a balance of high-temperature strength, good ductility, and corrosion resistance, suitable for high-temperature applications.
These properties ensure that ASME SA240/ASTM A240 UNS S30909 stainless steel sheet can withstand significant mechanical stresses in high-temperature environments. Solution annealing at 1040-1120°C (1904-2048°F) optimizes UNS S30909 mechanical properties for high-temperature performance.
|
Property |
Value at 20°C |
|---|---|
|
Tensile Strength (MPa) |
≥ 620 (90 ksi) |
|
Yield Strength (MPa) |
≥ 275 (40 ksi) |
|
Elongation (%) |
≥ 40 |
|
Hardness (HBW) |
≤ 217 |
|
Density |
7.89 g/cm³ (0.285 lb/in³) |
At Gangsteel, we’ve seen clients use sa 240/a 240 uns s30909 sheets in heat exchanger applications, where its high-temperature strength and corrosion resistance provide advantages over sa 240/a 240 uns s30940.
Keywords: ASME SA240/ASTM A240 UNS S30909 mechanical properties, UNS S30909 strength, 309H mechanical properties, ASME SA240 Gr S30909 mechanical properties
As a trusted uns stainless supplier, Gangsteel supplies sa 240/a 240 uns s30909 sheets, plates, coils, bars, and custom components, compliant with sa 240/a 240 uns stainless grades standards:
Our advanced manufacturing facilities ensure precision and quality, meeting the diverse needs of global projects, from standard sizes to custom-cut components.
Note: Need a specific size or finish? Gangsteel offers custom solutions, including precision cutting and heat treatments, to meet sa 240/a 240 uns stainless grades requirements. Contact us at admin@gangsteel.com for bespoke ASME SA240/ASTM A240 UNS S30909 material specifications.
Keywords: ASME SA240/ASTM A240 UNS S30909 stainless steel sheet specifications, UNS S30909 sheet specifications, ASME SA 240 Gr S30909 coil, ASME SA 240 Gr S30909 bar
ASME SA240/ASTM A240 UNS S30909 stainless steel sheetis tailored for industries requiring high-temperature strength and good corrosion resistance. Its high-carbon austenitic structure ensures durability in demanding environments.
Key ASME SA240/ASTM A240 UNS S30909 applications include:
Case Study: A petrochemical plant in India used sa 240/a 240 uns s30909 sheets for heat exchanger tubes, achieving a 15% cost reduction compared to sa 240/a 240 uns s30815 while maintaining reliable high-temperature performance.
Keywords: ASME SA240/ASTM A240 UNS S30909 applications, UNS S30909 uses, 309H applications, ASME SA240 Gr S30909 applications
To aid in material selection, here’s a comparison of sa 240/a 240 uns s30909 with sa 240/a 240 uns s30615, sa 240/a 240 uns s30815, sa 240/a 240 uns s30940, sa 240/a 240 uns s31040, sa 240/a 240 uns s31041, sa 240/a 240 uns s31050, and sa 240/a 240 uns s31060:
This comparison highlights the unique advantages of each grade, helping you select the optimal material for your project requirements.
|
Property |
ASME SA240/ASTM A240 UNS S30909 |
ASME SA240 UNS S30615 |
ASME SA240 UNS S30815 |
ASME SA240 UNS S30940 |
ASME SA240 UNS S31040 |
ASME SA240 UNS S31041 |
ASME SA240 UNS S31050 |
ASME SA240 UNS S31060 |
|---|---|---|---|---|---|---|---|---|
|
UNS Number |
S30909 |
S30615 |
S30815 |
S30940 |
S31040 |
S31041 |
S31050 |
S31060 |
|
Type |
Austenitic |
Austenitic |
Austenitic |
Austenitic |
Austenitic |
Austenitic |
Austenitic |
Austenitic |
|
Chromium Content |
22.0-24.0% |
18.0-19.5% |
20.0-22.0% |
22.0-24.0% |
24.0-26.0% |
24.0-26.0% |
24.0-26.0% |
24.0-26.0% |
|
Nickel Content |
12.0-15.0% |
13.5-15.0% |
10.0-12.0% |
12.0-15.0% |
19.0-22.0% |
19.0-22.0% |
21.0-23.0% |
19.0-22.0% |
|
Manganese Content |
≤ 2.0 |
≤ 2.0 |
≤ 0.80 |
≤ 2.0 |
≤ 2.0 |
≤ 2.0 |
≤ 2.0 |
≤ 2.0 |
|
Molybdenum Content |
- |
0.80-1.20% |
- |
- |
- |
- |
2.0-3.0% |
- |
|
Nitrogen Content |
- |
0.15-0.25% |
0.14-0.20% |
- |
- |
- |
0.10-0.16% |
- |
|
Carbon Content |
0.04-0.10% |
≤ 0.05% |
0.05-0.10% |
≤ 0.08% |
≤ 0.08% |
0.04-0.10% |
≤ 0.030% |
≤ 0.08% |
|
Corrosion Resistance |
Good in high-temperature environments |
Excellent in high-temperature environments |
Excellent in high-temperature environments |
Good in high-temperature environments |
Good in high-temperature environments |
Good in high-temperature environments |
Excellent in chemical environments |
Good in high-temperature environments |
|
Strength |
High (High-temperature) |
High (High-temperature) |
High (High-temperature) |
Moderate |
Moderate |
High (High-temperature) |
High (Chemical resistance) |
Moderate |
|
Temp Range |
Up to 1000°C (1832°F) |
Up to 950°C (1742°F) |
Up to 1150°C (2102°F) |
Up to 1000°C (1832°F) |
Up to 1100°C (2012°F) |
Up to 1100°C (2012°F) |
Up to 1100°C (2012°F) |
Up to 1100°C (2012°F) |
|
Cost (USD/kg) |
5-8 |
6-9 |
6-9 |
5-8 |
6-9 |
6-9 |
7-10 |
6-9 |
|
Applications |
Heat exchangers, furnace components |
High-temperature equipment, chemical processing |
Furnace components, petrochemical |
High-temperature welded structures |
High-temperature welded structures |
High-temperature equipment |
Chemical processing, high-temperature |
High-temperature equipment |
If you have future requirement, please contact us.
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