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For applications requiring excellent high-temperature corrosion resistance, good weldability, and moderate strength, ASME SA240/ASTM A240 UNS S30940 Stainless Steel Sheet (commonly known as 309Cb) is a reliable choice. As a leading uns stainless supplier, Gangsteel specializes in providing high-quality sa 240/a 240 uns s30940 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 S30940 chemical composition, density, mechanical properties, corrosion resistance, weldability, stainless steel surface finishes, equivalent materials, specifications, applications, and competitive ASME SA240/ASTM A240 UNS S30940 price per kg.
Whether you're an engineer designing furnace components or a procurement specialist sourcing for petrochemical applications, this article will clarify why 309Cb stainless steel (UNS S30940) 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 s30909, sa 240/a 240 uns s31040, sa 240/a 240 uns s31041, sa 240/a 240 uns s31050, sa 240/a 240 uns s31060, sa 240/a 240 uns s31254, sa 240/a 240 uns s31266, sa 240/a 240 uns s31635, sa 240/a 240 uns s31640, sa 240/a 240 uns s31651, and sa 240/a 240 uns s31653.
ASME SA240/ASTM A240 UNS S30940, known as 309Cb, is an austenitic stainless steel with 22.0-24.0% chromium, 12.0-15.0% nickel, and niobium stabilization (10xC min, 1.10% max). It is designed for high-temperature applications requiring excellent corrosion resistance, good weldability, and moderate strength, making it ideal for industries such as petrochemical, power generation, and furnace manufacturing. The niobium stabilization prevents carbide precipitation during welding, improving performance compared to sa 240/a 240 uns s30909, while the high chromium content enhances oxidation resistance up to 1000°C (1832°F).
The ASME SA240/ASTM A240 UNS S30940 stainless steel sheet offers superior weldability compared to sa 240/a 240 uns s30909 and better high-temperature corrosion resistance than sa 240/a 240 uns s31635 due to its higher chromium and nickel content. While it is less corrosion-resistant in chloride-rich environments than grades like sa 240/a 240 uns s31254, its balance of high-temperature performance and weldability makes it a preferred choice for furnace and petrochemical applications.
Key benefits of ASME SA240/ASTM A240 UNS S30940 stainless steel sheet include:
Case Study: A petrochemical plant in India used sa 240/a 240 uns s30940 sheets for furnace components, achieving a 25% reduction in welding defects compared to sa 240/a 240 uns s30909 due to its superior weldability and high-temperature performance.
Keywords: ASME SA240/ASTM A240 UNS S30940 stainless steel sheet, UNS S30940 sheet, 309Cb stainless steel, high-temperature stainless steel sheet
The density of ASME SA240/ASTM A240 UNS S30940 stainless steel sheet is approximately 7.89 g/cm³ (0.285 lb/in³). This density is typical for high-chromium and high-nickel austenitic stainless steels, reflecting the material's composition. The consistent density ensures predictable performance in applications requiring precise weight calculations, such as furnace components and heat exchangers. Compared to grades like sa 240/a 240 uns s31040 (7.89 g/cm³) and sa 240/a 240 uns s31635 (8.00 g/cm³), the density is similar, making UNS S30940 a reliable choice for weight-sensitive high-temperature applications.
Keywords: ASME SA240/ASTM A240 UNS S30940 density, UNS S30940 density, 309Cb density
ASME SA240/ASTM A240 UNS S30940offers excellent corrosion resistance in high-temperature environments, such as petrochemical and power generation 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 furnace linings and heat exchanger tubes. It outperforms sa 240/a 240 uns s31640 in high-temperature corrosion resistance due to its higher chromium content but is less resistant in chloride-rich environments compared to sa 240/a 240 uns s31254 or sa 240/a 240 uns s31266.
Keywords: ASME SA240/ASTM A240 UNS S30940 corrosion resistance, UNS S30940 corrosion properties, 309Cb corrosion resistance
The niobium stabilization in ASME SA240/ASTM A240 UNS S30940 ensures superior weldability by preventing carbide precipitation and intergranular corrosion during welding, making it more weldable than sa 240/a 240 uns s30909. It can be welded using common techniques such as TIG, MIG, and shielded metal arc welding, with niobium-containing filler materials to maintain corrosion resistance and strength. Compared to sa 240/a 240 uns s31060, UNS S30940 offers similar weldability but is more cost-effective. For applications requiring enhanced corrosion resistance and weldability, sa 240/a 240 uns s31050 is a viable alternative.
Keywords: ASME SA240/ASTM A240 UNS S30940 weldability, UNS S30940 welding properties, 309Cb weldability
The surface finish of ASME SA240/ASTM A240 UNS S30940 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 s30940 to be tailored for aesthetic or functional requirements, such as the NO.1 finish for furnace components or the 2B finish for petrochemical applications.
Keywords: ASME SA240/ASTM A240 UNS S30940 surface finish, UNS S30940 stainless steel surface, 309Cb surface finishes
The ASME SA240/ASTM A240 UNS S30940 chemical composition is optimized for high-temperature corrosion resistance and weldability, compliant with sa 240/a 240 uns stainless grades standards.
The high chromium (22.0-24.0%), nickel (12.0-15.0%), and niobium stabilization provide excellent corrosion resistance and weldability compared to sa 240/a 240 uns s30909.
|
Element |
Percentage (%) |
|---|---|
|
Chromium (Cr) |
22.0 – 24.0 |
|
Nickel (Ni) |
12.0 – 15.0 |
|
Niobium (Nb) |
10xC – 1.10 |
|
Carbon (C) |
≤ 0.08 |
|
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 S30940 chemical composition, UNS S30940 composition, 309Cb chemistry, ASME SA240 Gr S30940 composition
The ASME SA240/ASTM A240 UNS S30940 mechanical properties offer a balance of moderate strength, good ductility, and excellent high-temperature corrosion resistance, suitable for high-temperature applications.
These properties ensure that ASME SA240/ASTM A240 UNS S30940 stainless steel sheet can withstand mechanical stresses in high-temperature environments. Solution annealing at 1040-1100°C (1904-2012°F) optimizes UNS S30940 mechanical properties for corrosion resistance and weldability.
|
Property |
Value at 20°C |
|---|---|
|
Tensile Strength (MPa) |
≥ 515 (75 ksi) |
|
Yield Strength (MPa) |
≥ 205 (30 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 s30940 sheets in petrochemical reactors, where its weldability and high-temperature corrosion resistance provide advantages over sa 240/a 240 uns s30909.
Keywords: ASME SA240/ASTM A240 UNS S30940 mechanical properties, UNS S30940 strength, 309Cb mechanical properties, ASME SA240 Gr S30940 mechanical properties
As a trusted uns stainless supplier, Gangsteel supplies sa 240/a 240 uns s30940 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 S30940 material specifications.
Keywords: ASME SA240/ASTM A240 UNS S30940 stainless steel sheet specifications, UNS S30940 sheet specifications, ASME SA 240 Gr S30940 coil, ASME SA 240 Gr S30940 bar
ASME SA240/ASTM A240 UNS S30940 stainless steel sheetis tailored for industries requiring excellent high-temperature corrosion resistance and good weldability. Its niobium-stabilized austenitic structure ensures durability in demanding environments.
Key ASME SA240/ASTM A240 UNS S30940 applications include:
Case Study: A power generation facility in India used sa 240/a 240 uns s30940 sheets for boiler tubes, achieving a 20% cost reduction compared to sa 240/a 240 uns s31060 while maintaining reliable high-temperature performance.
Keywords: ASME SA240/ASTM A240 UNS S30940 applications, UNS S30940 uses, 309Cb applications, ASME SA240 Gr S30940 applications
To aid in material selection, here’s a comparison of sa 240/a 240 uns s30940 with six related grades: sa 240/a 240 uns s30909, sa 240/a 240 uns s31040, sa 240/a 240 uns s31041, sa 240/a 240 uns s31060, sa 240/a 240 uns s31635, and sa 240/a 240 uns s31640. This comparison is limited to seven grades to ensure display compatibility, focusing on grades relevant to high-temperature and weldable applications.
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 S30940 |
ASME SA240 UNS S30909 |
ASME SA240 UNS S31040 |
ASME SA240 UNS S31041 |
ASME SA240 UNS S31060 |
ASME SA240 UNS S31635 |
ASME SA240 UNS S31640 |
|---|---|---|---|---|---|---|---|
|
UNS Number |
S30940 |
S30909 |
S31040 |
S31041 |
S31060 |
S31635 |
S31640 |
|
Type |
Austenitic |
Austenitic |
Austenitic |
Austenitic |
Austenitic |
Austenitic |
Austenitic |
|
Chromium Content |
22.0-24.0% |
22.0-24.0% |
24.0-26.0% |
24.0-26.0% |
24.0-26.0% |
16.0-18.0% |
16.0-18.0% |
|
Nickel Content |
12.0-15.0% |
12.0-15.0% |
19.0-22.0% |
19.0-22.0% |
19.0-22.0% |
10.0-14.0% |
10.0-14.0% |
|
Manganese Content |
≤ 2.0 |
≤ 2.0 |
≤ 2.0 |
≤ 2.0 |
≤ 2.0 |
≤ 2.0 |
≤ 2.0 |
|
Molybdenum Content |
- |
- |
- |
- |
- |
2.0-3.0% |
2.0-3.0% |
|
Nitrogen Content |
- |
- |
- |
- |
- |
- |
- |
|
Carbon Content |
≤ 0.08% |
0.04-0.10% |
≤ 0.08% |
0.04-0.10% |
≤ 0.08% |
≤ 0.08% |
≤ 0.08% |
|
Corrosion Resistance |
Good in high-temperature environments |
Good in high-temperature environments |
Good in high-temperature environments |
Good in high-temperature environments |
Good in high-temperature environments |
Good in chloride environments |
Good in chloride environments |
|
Strength |
Moderate |
High (High-temperature) |
Moderate |
High (High-temperature) |
Moderate |
Moderate |
Moderate |
|
Temp Range |
Up to 1000°C (1832°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 870°C (1598°F) |
Up to 870°C (1598°F) |
|
Cost (USD/kg) |
5-8 |
5-8 |
6-9 |
6-9 |
6-9 |
5-8 |
5-8 |
|
Applications |
High-temperature welded structures |
Heat exchangers, furnace components |
High-temperature welded structures |
High-temperature equipment |
High-temperature equipment |
Chemical, pharmaceutical |
Chemical, pharmaceutical |
Conclusion: Choose sa 240/a 240 uns s30940 for cost-effective, weldable high-temperature applications, sa 240/a 240 uns s30909 or sa 240/a 240 uns s31041 for high-temperature strength, sa 240/a 240 uns s31040 or sa 240/a 240 uns s31060 for enhanced high-temperature corrosion resistance, or sa 240/a 240 uns s31635 or sa 240/a 240 uns s31640 for chloride-rich environments.
Keywords: ASME SA240/ASTM A240 UNS S30940 vs ASME SA240 UNS S30909, ASME SA240/ASTM A240 UNS S30940 vs ASME SA240 UNS S31040, ASME SA240/ASTM A240 UNS S30940 vs ASME SA240 UNS S31041, ASME SA240/ASTM A240 UNS S30940 vs ASME SA240 UNS S31060, ASME SA240/ASTM A240 UNS S30940 vs ASME SA240 UNS S31635, ASME SA240/ASTM A240 UNS S30940 vs ASME SA240 UNS S31640, 309Cb comparison
ASME SA240/ASTM A240 UNS S30940aligns with international standards for global compatibility, ensuring seamless integration into projects worldwide.
The equivalent grades allow for flexibility in sourcing materials across different regions, making ASME SA240/ASTM A240 UNS S30940 a versatile choice for high-temperature applications.
|
Standard |
Grade |
|---|---|
|
UNS |
S30940 |
|
W.Nr. |
1.4828 |
|
EN |
X15CrNiSi20-12 |
|
ASTM |
A240 |
|
ASME |
SA240 |
Note: ASME SA240/ASTM A240 UNS S30940 equivalent grades comply with sa 240/a 240 uns stainless grades standards, offering interchangeability with sa 240/a 240 uns s31040 for similar applications.
Keywords: ASME SA240/ASTM A240 UNS S30940 equivalent, UNS S30940 equivalent, ASME SA 240 Gr S30940 material standards, EN X15CrNiSi20-12
The allowable stress values for ASME SA240/ASTM A240 UNS S30940, per ASME BPVC Section II, Part D, ensure reliable performance in high-temperature environments.
These values reflect the material’s ability to withstand mechanical stresses at elevated temperatures while maintaining corrosion resistance.
|
Temperature (°C) |
Allowable Stress (MPa) |
|---|---|
|
100 |
125 |
|
200 |
115 |
|
300 |
105 |
|
400 |
95 |
|
500 |
85 |
Note: These values ensure sa 240/a 240 uns s30940 performs reliably in petrochemical and furnace applications.
Keywords: ASME SA240/ASTM A240 UNS S30940 allowable stress, UNS S30940 strength, ASME SA240 Gr S30940 material stress
The ASME SA240/ASTM A240 UNS S30940 price per kg ranges from USD 5-8 per kg (FOB), influenced by several factors:
The excellent high-temperature corrosion resistance and weldability of ASME SA240/ASTM A240 UNS S30940 make it a valuable choice for petrochemical and power generation applications.
For a precise ASME SA240/ASTM A240 UNS S30940 price per kg or bulk discounts, contact Gangsteel at admin@gangsteel.com.
Keywords: ASME SA240/ASTM A240 UNS S30940 price per kg, UNS S30940 cost, 309Cb price
As a leading uns stainless supplier, Gangsteel offers a wide range of sa 240/a 240 uns stainless grades to complement sa 240/a 240 uns s30940 for various applications:
This diverse portfolio ensures clients can find the ideal material for their specific project needs, from corrosion resistance to high-temperature performance.
Note: These grades complement sa 240/a 240 uns s30940 in high-temperature and corrosion-resistant applications. Contact Gangsteel for a full catalog to find the perfect material for your project.
Keywords: ASME SA240/ASTM A240 UNS S30940 related grades, UNS S30940 stainless steel grades, 309Cb grades
Q: What is the main difference between ASME SA240/ASTM A240 UNS S30940 and ASME SA240 UNS S30909?
A: ASME SA240/ASTM A240 UNS S30940 offers superior weldability due to niobium stabilization, while sa 240/a 240 uns s30909 provides higher high-temperature strength due to higher carbon content.
Q: Is ASME SA240/ASTM A240 UNS S30940 suitable for furnace applications?
A: Yes, its excellent high-temperature corrosion resistance and good weldability make it ideal for furnace components compared to sa 240/a 240 uns s31635.
Q: How does the price of ASME SA240/ASTM A240 UNS S30940 compare to ASME SA240 UNS S31060?
A: ASME SA240/ASTM A240 UNS S30940 is typically 20-30% less expensive than sa 240/a 240 uns s31060 due to lower nickel content, offering cost-effective performance for high-temperature applications.
Keywords: ASME SA240/ASTM A240 UNS S30940 FAQ, UNS S30940 stainless steel questions, 309Cb FAQ
For sa 240/a 240 uns s30940 quotes, technical data sheets, or custom solutions, contact Gangsteel at admin@gangsteel.com. Explore our sa 240/a 240 uns stainless grades portfolio for more options.
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