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For applications requiring cost-effective corrosion resistance, good weldability, and moderate heat resistance, ASME SA240/ASTM A240 UNS S40900 Stainless Steel Sheet (commonly known as 409) is an excellent choice. As a leading uns stainless supplier, Gangsteel specializes in providing high-quality sa240/a240 uns s40900 sheets, plates, coils, bars, and custom components, all compliant with sa240/a240 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 guide exploresthe ASME SA240/ASTM A240 UNS S40900 chemical composition, density, mechanical properties, corrosion resistance, weldability, stainless steel surface finishes, equivalent materials, specifications, applications, and competitive ASME SA240/ASTM A240 UNS S40900 price per kg.
Whether you're an engineer designing automotive exhaust systems or a procurement specialist sourcing for industrial applications, this article will clarify why 409 stainless steel (UNS S40900) is a trusted option.
Explore our sa240/a240 uns stainless grades portfolio for related grades like sa240/a240 uns s40500, sa240/a240 uns s40910, sa240/a240 uns s40920, sa240/a240 uns s40930, sa240/a240 uns s40945, sa240/a240 uns s40975, sa240/a240 uns s40977, sa240/a240 uns s41000, sa240/a240 uns s41008, sa240/a240 uns s41045, sa240/a240 uns s41050, sa240/a240 uns s41500, sa240/a240 uns s42035, sa240/a240 uns s42900, sa240/a240 uns s43000, sa240/a240 uns s43035, sa240/a240 uns s43400, sa240/a240 uns s43600, sa240/a240 uns s43932, sa240/a240 uns s44400, sa240/a240 uns s44500, sa240/a240 uns s44626, sa240/a240 uns s44627, sa240/a240 uns s44635, sa240/a240 uns s44660, sa240/a240 uns s44700, sa240/a240 uns s44735, sa240/a240 uns s44800, and sa240/a240 uns s46800.
ASME SA240/ASTM A240 UNS S40900, known as 409, is a ferritic stainless steel with 10.5-11.75% chromium and titanium stabilization (6xC min, 0.75% max). It is designed for applications requiring cost-effective corrosion resistance, excellent weldability, and moderate heat resistance, making it ideal for industries such as automotive, industrial processing, and exhaust system manufacturing. The titanium stabilization prevents carbide precipitation during welding, ensuring superior weldability compared to non-stabilized grades like sa240/a240 uns s41000, while its ferritic structure provides good resistance to scaling at temperatures up to 675°C (1247°F).
The ASME SA240/ASTM A240 UNS S40900 stainless steel sheet offers excellent weldability and cost-effectiveness compared to sa240/a240 uns s40500 and is more affordable than higher-alloy grades like sa240/a240 uns s44400 for automotive applications. While it is less corrosion-resistant in chloride-rich environments than grades like sa240/a240 uns s41500, its low cost and weldability make it a preferred choice for automotive exhaust systems and industrial components.
Key benefits of ASME SA240/ASTM A240 UNS S40900 stainless steel sheet include:
Case Study: An automotive manufacturer in India used sa240/a240 uns s40900 sheets for exhaust system components, achieving a 30% cost reduction compared to sa240/a240 uns s40500 while maintaining reliable corrosion resistance and weldability.
Keywords: ASME SA240/ASTM A240 UNS S40900 stainless steel sheet, UNS S40900 sheet, 409 stainless steel, corrosion-resistant stainless steel sheet
The density of ASME SA240/ASTM A240 UNS S40900 stainless steel sheet is approximately 7.70 g/cm³ (0.278 lb/in³). This density is typical for ferritic stainless steels, reflecting its composition with low nickel and titanium stabilization. The consistent density ensures predictable performance in applications requiring precise weight calculations, such as automotive exhaust systems and industrial components. Compared to grades like sa240/a240 uns s40500 (7.70 g/cm³) and sa240/a240 uns s41500 (7.80 g/cm³), the density is similar, making UNS S40900 a lightweight, cost-effective option for automotive applications.
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ASME SA240/ASTM A240 UNS S40900offers good corrosion resistance in mild atmospheres, water, and some chemical environments due to its 10.5-11.75% chromium content, which forms a protective oxide layer. It is suitable for applications like automotive exhaust systems and industrial components exposed to non-aggressive environments, with a pitting resistance equivalent number (PREN) of ~10.5-11.75. The titanium stabilization enhances resistance to intergranular corrosion, making it more suitable for welded structures than sa240/a240 uns s41000. However, it is less resistant to chloride-rich environments compared to molybdenum-containing grades like sa240/a240 uns s44400 or sa240/a240 uns s41500. For high-temperature oxidation resistance, grades like sa240/a240 uns s43000 are recommended.
Keywords: ASME SA240/ASTM A240 UNS S40900 corrosion resistance, UNS S40900 corrosion properties, 409 corrosion resistance
The titanium stabilization and low carbon content (≤ 0.08%) in ASME SA240/ASTM A240 UNS S40900 ensure excellent weldability by minimizing carbide precipitation and preventing intergranular corrosion during welding, making it more weldable than martensitic grades like sa240/a240 uns s41000. It can be welded using common techniques such as TIG, MIG, and shielded metal arc welding, with titanium-stabilized or low-carbon ferritic filler materials to maintain corrosion resistance and strength. Compared to sa240/a240 uns s41008, UNS S40900 offers improved weldability due to titanium stabilization, particularly for automotive exhaust applications. For applications requiring superior corrosion resistance and weldability, sa240/a240 uns s44400 is a viable alternative.
Keywords: ASME SA240/ASTM A240 UNS S40900 weldability, UNS S40900 welding properties, 409 weldability
The surface finish of ASME SA240/ASTM A240 UNS S40900 stainless steel sheet significantly impacts its aesthetic appeal, functionality, and application suitability. Gangsteel offers a variety of surface finishes to meet diverse project requirements, presented in a clear tabular format:
|
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 |
Industrial tanks, pipes, no need for surface gloss |
|
2B |
Stronger gloss than NO.2D |
Cold rolled, heat treated, pickled, and lightly cold rolled by polishing rollers |
Automotive exhausts, industrial equipment, general materials |
|
NO.2D/2BB |
Silver white |
Heat treatment and pickling after cold rolling |
Deep-drawn components, general materials |
|
NO.3 |
Rough grinding |
Polished with No.100 to No.120 abrasives (JIS R6001) or 100~200# grinding belt |
Building materials, automotive components |
|
NO.4 (4K) |
Intermediate grinding |
Polished with No.150 to No.180 abrasives (JIS R6001) or 150~180# stone abrasive belt |
Architectural panels, industrial components |
|
NO.240 |
Fine grinding |
Grinding with 240# stone abrasive belt |
Precision components, decorative parts |
|
NO.320 |
Very fine grinding |
Grinding with 320# abrasive belt |
High-end industrial components |
|
NO.400 |
Gloss close to BA |
Grinding with 400# polishing wheel |
Decorative trim, industrial fittings |
|
HL |
Hairline grinding, continuous polishing streaks |
Polished with suitable grain size abrasive (150~240#) for hairline grinding |
Architectural cladding, structural components |
|
BA (No.6/BA1/BA0) |
Bright as a mirror |
Bright heat treatment after cold rolling, high surface reflectivity |
Decorative surfaces, high-end fittings |
|
NO.7 |
Close to mirror polishing |
Grinding with 600# rotary polishing wheel |
Art installations, decorative applications |
|
NO.8 (Mirror/8K) |
Shining like a mirror |
Grinding mirrors with polishing wheels |
Reflectors, architectural accents |
These surface finishes allow sa240/a240 uns s40900 to be tailored for aesthetic or functional requirements, such as the 2B finish for automotive exhausts or the NO.4 finish for industrial panels.
Keywords: ASME SA240/ASTM A240 UNS S40900 surface finish, UNS S40900 stainless steel surface, 409 surface finishes
The ASME SA240/ASTM A240 UNS S40900 chemical composition is optimized for cost-effective corrosion resistance, weldability, and moderate heat resistance, compliant with sa240/a240 uns stainless grades standards.
The chromium (10.5-11.75%) and titanium stabilization (6xC min, 0.75% max) provide good corrosion resistance and excellent weldability compared to sa240/a240 uns s41000.
|
Element |
Percentage (%) |
|---|---|
|
Chromium (Cr) |
10.5 – 11.75 |
|
Titanium (Ti) |
6xC – 0.75 |
|
Carbon (C) |
≤ 0.08 |
|
Manganese (Mn) |
≤ 1.0 |
|
Silicon (Si) |
≤ 1.0 |
|
Phosphorus (P) |
≤ 0.045 |
|
Sulfur (S) |
≤ 0.030 |
|
Nickel (Ni) |
≤ 0.50 |
|
Nitrogen (N) |
≤ 0.03 |
|
Iron (Fe) |
Balance (~85%) |
Keywords: ASME SA240/ASTM A240 UNS S40900 chemical composition, UNS S40900 composition, 409 chemistry, ASME SA240 Gr S40900 composition
The ASME SA240/ASTM A240 UNS S40900 mechanical properties offer a balance of moderate strength, good ductility, and excellent weldability, suitable for automotive and industrial applications.
These properties ensure that ASME SA240/ASTM A240 UNS S40900 stainless steel sheet can withstand mechanical stresses in mild to moderately corrosive environments. Annealing at 815-900°C (1500-1650°F) optimizes UNS S40900 mechanical properties for corrosion resistance and weldability.
|
Property |
Value at 20°C |
|---|---|
|
Tensile Strength (MPa) |
≥ 380 (55 ksi) |
|
Yield Strength (MPa) |
≥ 205 (30 ksi) |
|
Elongation (%) |
≥ 20 |
|
Hardness (HBW) |
≤ 183 |
|
Density |
7.70 g/cm³ (0.278 lb/in³) |
At Gangsteel, we’ve seen clients use sa240/a240 uns s40900 sheets in automotive exhaust systems, where its weldability and cost-effectiveness provide advantages over sa240/a240 uns s40500.
Keywords: ASME SA240/ASTM A240 UNS S40900 mechanical properties, UNS S40900 strength, 409 mechanical properties, ASME SA240 Gr S40900 mechanical properties
As a trusted uns stainless supplier, Gangsteel supplies sa240/a240 uns s40900 sheets, plates, coils, bars, and custom components, compliant with sa240/a240 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 sa240/a240 uns stainless grades requirements. Contact us at admin@gangsteel.com for bespoke ASME SA240/ASTM A240 UNS S40900 material specifications.
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ASME SA240/ASTM A240 UNS S40900 stainless steel sheetis tailored for industries requiring cost-effective corrosion resistance, excellent weldability, and moderate heat resistance. Its ferritic structure ensures durability in non-aggressive environments.
Key ASME SA240/ASTM A240 UNS S40900 applications include:
Case Study: An automotive manufacturer in India used sa240/a240 uns s40900 sheets for catalytic converter components, achieving a 35% cost reduction compared to sa240/a240 uns s41008 while maintaining reliable performance and weldability.
Keywords: ASME SA240/ASTM A240 UNS S40900 applications, UNS S40900 uses, 409 applications, ASME SA240 Gr S40900 applications
To aid in material selection, here’s a comparison of sa240/a240 uns s40900 with six related grades: sa240/a240 uns s40500, sa240/a240 uns s41000, sa240/a240 uns s41008, sa240/a240 uns s43000, sa240/a240 uns s44400, and sa240/a240 uns s41500. This comparison is limited to seven grades to ensure display compatibility, focusing on ferritic and martensitic grades for corrosion resistance and automotive 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 S40900 |
ASME SA240 UNS S40500 |
ASME SA240 UNS S41000 |
ASME SA240 UNS S41008 |
ASME SA240 UNS S43000 |
ASME SA240 UNS S44400 |
ASME SA240 UNS S41500 |
|---|---|---|---|---|---|---|---|
|
UNS Number |
S40900 |
S40500 |
S41000 |
S41008 |
S43000 |
S44400 |
S41500 |
|
Type |
Ferritic |
Ferritic |
Martensitic |
Ferritic |
Ferritic |
Ferritic |
Martensitic |
|
Chromium Content |
10.5-11.75% |
11.5-14.5% |
11.5-13.5% |
11.5-13.5% |
16.0-18.0% |
17.0-20.0% |
11.5-14.0% |
|
Nickel Content |
≤ 0.50% |
≤ 0.60% |
≤ 0.75% |
≤ 0.60% |
≤ 0.75% |
1.0% max |
3.5-5.5% |
|
Manganese Content |
≤ 1.0 |
≤ 1.0 |
≤ 1.0 |
≤ 1.0 |
≤ 1.0 |
≤ 1.0 |
≤ 1.0 |
|
Molybdenum Content |
- |
- |
- |
- |
- |
1.75-2.50% |
0.5-1.0% |
|
Nitrogen Content |
≤ 0.03% |
- |
- |
- |
- |
≤ 0.035% |
- |
|
Carbon Content |
≤ 0.08% |
≤ 0.08% |
0.08-0.15% |
≤ 0.08% |
≤ 0.12% |
≤ 0.025% |
≤ 0.05% |
|
Corrosion Resistance |
Good in mild environments |
Good in mild environments |
Good in mild environments |
Good in mild environments |
Good in mild environments |
Excellent in chloride environments |
Excellent in chloride environments |
|
Strength |
Moderate |
Moderate |
High (Martensitic) |
High (Ferritic) |
Moderate |
Moderate |
High (Martensitic) |
|
Temp Range |
Up to 675°C (1247°F) |
Up to 700°C (1292°F) |
Up to 650°C (1202°F) |
Up to 650°C (1202°F) |
Up to 815°C (1500°F) |
Up to 815°C (1500°F) |
Up to 650°C (1202°F) |
|
Cost (USD/kg) |
2.5-4 |
3-5 |
3-5 |
3-5 |
3-5 |
4-6 |
4-7 |
|
Applications |
Automotive exhausts, industrial |
Automotive, heat exchangers |
Cutlery, industrial |
Automotive, industrial |
Appliances, trim |
Water heaters, piping |
Oil and gas, marine |
Conclusion: Choose sa240/a240 uns s40900 for cost-effective, weldable automotive exhaust applications, sa240/a240 uns s40500 for heat exchangers, sa240/a240 uns s41000 for high-strength applications, sa240/a240 uns s41008 for similar mild environments, sa240/a240 uns s43000 for general-purpose corrosion resistance, sa240/a240 uns s44400 for chloride-rich environments, or sa240/a240 uns s41500 for high-strength, corrosive applications.
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ASME SA240/ASTM A240 UNS S40900aligns 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 S40900 a versatile choice for cost-effective, corrosion-resistant applications.
|
Standard |
Grade |
|---|---|
|
UNS |
S40900 |
|
W.Nr. |
1.4512 |
|
EN |
X2CrTi12 |
|
ASTM |
A240 409 |
|
ASME |
SA240 409 |
Note: ASME SA240/ASTM A240 UNS S40900 equivalent grades comply with sa240/a240 uns stainless grades standards, offering interchangeability with sa240/a240 uns s40910 for similar applications.
Keywords: ASME SA240/ASTM A240 UNS S40900 equivalent, UNS S40900 equivalent, ASME SA 240 Gr S40900 material standards, EN X2CrTi12
The allowable stress values for ASME SA240/ASTM A240 UNS S40900, per ASME BPVC Section II, Part D, ensure reliable performance in mild to moderately corrosive environments.
These values reflect the material’s ability to withstand mechanical stresses at moderate temperatures while maintaining corrosion resistance.
|
Temperature (°C) |
Allowable Stress (MPa) |
|---|---|
|
100 |
110 |
|
200 |
100 |
|
300 |
90 |
|
400 |
80 |
|
500 |
70 |
Note: These values ensure sa240/a240 uns s40900 performs reliably in automotive and industrial applications.
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The ASME SA240/ASTM A240 UNS S40900 price per kg ranges from USD 2.5-4 per kg (FOB), influenced by several factors:
The cost-effective corrosion resistance, excellent weldability, and moderate heat resistance of ASME SA240/ASTM A240 UNS S40900 make it a valuable choice for automotive and industrial applications.
For a precise ASME SA240/ASTM A240 UNS S40900 price per kg or bulk discounts, contact Gangsteel at admin@gangsteel.com.
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As a leading uns stainless supplier, Gangsteel offers a wide range of sa240/a240 uns stainless grades to complement sa240/a240 uns s40900 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 sa240/a240 uns s40900 in corrosion-resistant and automotive applications. Contact Gangsteel for a full catalog to find the perfect material for your project.
Keywords: ASME SA240/ASTM A240 UNS S40900 related grades, UNS S40900 stainless steel grades, 409 grades
Q: What is the main difference between ASME SA240/ASTM A240 UNS S40900 and ASME SA240 UNS S40500?
A: ASME SA240/ASTM A240 UNS S40900 is more cost-effective with titanium stabilization for excellent weldability, while sa240/a240 uns s40500 offers slightly better corrosion resistance due to higher chromium and aluminum.
Q: Is ASME SA240/ASTM A240 UNS S40900 suitable for automotive exhaust applications?
A: Yes, its cost-effective corrosion resistance and excellent weldability make it ideal for automotive exhaust systems compared to sa240/a240 uns s41000.
Q: How does the price of ASME SA240/ASTM A240 UNS S40900 compare to ASME SA240 UNS S44400?
A: ASME SA240/ASTM A240 UNS S40900 is typically 30-40% less expensive than sa240/a240 uns s44400 due to lower alloy content, offering cost-effective performance for mild environments.
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For sa240/a240 uns s40900 quotes, technical data sheets, or custom solutions, contact Gangsteel at admin@gangsteel.com. Explore our sa240/a240 uns stainless grades portfolio for more options.
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