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For applications requiring exceptional corrosion resistance in chloride-rich environments, superior weldability, and high strength, ASME SA240/ASTM A240 UNS S31254 Stainless Steel Sheet (commonly known as 254 SMO) is a premier choice. As a leading uns stainless supplier, Gangsteel specializes in providing high-quality sa 240/a 240 uns s31254 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.
This comprehensive guide explores the ASME SA240/ASTM A240 UNS S31254 chemical composition, density, mechanical properties, corrosion resistance, weldability, stainless steel surface finishes, equivalent materials, specifications, applications, and competitive ASME SA240/ASTM A240 UNS S31254 price per kg.
Whether you're an engineer designing marine equipment or a procurement specialist sourcing for chemical processing applications, this article will clarify why 254 SMO stainless steel (UNS S31254) 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 s30940, sa 240/a 240 uns s31040, sa 240/a 240 uns s31041, sa 240/a 240 uns s31050, sa 240/a 240 uns s31060, and sa 240/a 240 uns s31266.
ASME SA240/ASTM A240 UNS S31254, known as 254 SMO, is a high-alloy austenitic stainless steel with 19.5-20.5% chromium, 17.5-18.5% nickel, 6.0-6.5% molybdenum, and 0.18-0.22% nitrogen. It is designed for applications requiring exceptional corrosion resistance in chloride-rich environments, superior weldability, and high strength, making it ideal for industries such as marine, chemical processing, and oil and gas. The high molybdenum and nitrogen content provide outstanding pitting and crevice corrosion resistance, while the low carbon content (≤ 0.020%) ensures excellent weldability compared to sa 240/a 240 uns s31050.
The ASME SA240/ASTM A240 UNS S31254 stainless steel sheet offers superior corrosion resistance compared to sa 240/a 240 uns s31060 and better pitting resistance than sa 240/a 240 uns s31050 due to its higher molybdenum content. While it is slightly less corrosion-resistant than sa 240/a 240 uns s31266, its balance of corrosion resistance, weldability, and cost-effectiveness makes it a preferred choice for marine and chemical processing applications.
Key benefits of ASME SA240/ASTM A240 UNS S31254 stainless steel sheet include:
Case Study: A marine equipment manufacturer in India used sa 240/a 240 uns s31254 sheets for seawater piping, achieving a 40% reduction in corrosion-related maintenance compared to sa 240/a 240 uns s31050 due to its superior pitting resistance.
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The density of ASME SA240/ASTM A240 UNS S31254 stainless steel sheet is approximately 8.00 g/cm³ (0.289 lb/in³). This slightly higher density compared to standard austenitic stainless steels (e.g., 7.89 g/cm³ for sa 240/a 240 uns s31060) reflects its high-alloy composition, including significant molybdenum and nitrogen. The consistent density ensures predictable performance in applications requiring precise weight calculations, such as marine and chemical processing equipment. Compared to grades like sa 240/a 240 uns s31050 (7.89 g/cm³) and sa 240/a 240 uns s31266 (8.00 g/cm³), the density is similar, making UNS S31254 a reliable choice for corrosion-resistant applications.
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ASME SA240/ASTM A240 UNS S31254offers exceptional corrosion resistance in chloride-rich and aggressive chemical environments, such as marine and chemical processing settings. Its 19.5-20.5% chromium, 17.5-18.5% nickel, 6.0-6.5% molybdenum, and 0.18-0.22% nitrogen content provide a robust protective oxide layer and outstanding pitting resistance, with a pitting resistance equivalent number (PREN) of ~42-44. This makes it suitable for applications like seawater piping and chemical reactors, outperforming sa 240/a 240 uns s31050 and sa 240/a 240 uns s30815. For even more severe corrosive environments, sa 240/a 240 uns s31266 is recommended.
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The ultra-low carbon content (≤ 0.020%) of ASME SA240/ASTM A240 UNS S31254 ensures superior weldability by minimizing carbide precipitation and intergranular corrosion during welding, making it more weldable than sa 240/a 240 uns s31041 and sa 240/a 240 uns s30909. It can be welded using common techniques such as TIG, MIG, and shielded metal arc welding, with high-molybdenum filler materials to maintain corrosion resistance and strength. Compared to sa 240/a 240 uns s31050, UNS S31254 offers comparable weldability but superior pitting resistance due to higher molybdenum content. For applications requiring extreme corrosion resistance and weldability, sa 240/a 240 uns s31266 is a viable alternative.
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The surface finish of ASME SA240/ASTM A240 UNS S31254 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 s31254 to be tailored for aesthetic or functional requirements, such as the 2B finish for chemical reactors or the NO.4 finish for marine equipment.
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The ASME SA240/ASTM A240 UNS S31254 chemical composition is optimized for exceptional corrosion resistance and weldability, compliant with sa 240/a 240 uns stainless grades standards.
The high chromium (19.5-20.5%), nickel (17.5-18.5%), molybdenum (6.0-6.5%), and nitrogen (0.18-0.22%) content, combined with ultra-low carbon (≤ 0.020%), provide superior corrosion resistance compared to sa 240/a 240 uns s31050.
|
Element |
Percentage (%) |
|---|---|
|
Chromium (Cr) |
19.5 – 20.5 |
|
Nickel (Ni) |
17.5 – 18.5 |
|
Molybdenum (Mo) |
6.0 – 6.5 |
|
Nitrogen (N) |
0.18 – 0.22 |
|
Carbon (C) |
≤ 0.020 |
|
Manganese (Mn) |
≤ 1.0 |
|
Silicon (Si) |
≤ 0.80 |
|
Phosphorus (P) |
≤ 0.030 |
|
Sulfur (S) |
≤ 0.010 |
|
Copper (Cu) |
0.50 – 1.00 |
|
Iron (Fe) |
Balance (~55%) |
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The ASME SA240/ASTM A240 UNS S31254 mechanical properties offer a balance of high strength, excellent corrosion resistance, and superior weldability, suitable for marine and chemical processing applications.
These properties ensure that ASME SA240/ASTM A240 UNS S31254 stainless steel sheet can withstand mechanical stresses in aggressive environments. Solution annealing at 1150-1200°C (2102-2192°F) optimizes UNS S31254 mechanical properties for corrosion resistance and strength.
|
Property |
Value at 20°C |
|---|---|
|
Tensile Strength (MPa) |
≥ 650 (94 ksi) |
|
Yield Strength (MPa) |
≥ 300 (44 ksi) |
|
Elongation (%) |
≥ 35 |
|
Hardness (HBW) |
≤ 220 |
|
Density |
8.00 g/cm³ (0.289 lb/in³) |
At Gangsteel, we’ve seen clients use sa 240/a 240 uns s31254 sheets in seawater handling systems, where its corrosion resistance and weldability provide significant advantages over sa 240/a 240 uns s31050.
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As a trusted uns stainless supplier, Gangsteel supplies sa 240/a 240 uns s31254 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 S31254 material specifications.
Keywords: ASME SA240/ASTM A240 UNS S31254 stainless steel sheet specifications, UNS S31254 sheet specifications, ASME SA 240 Gr S31254 coil, ASME SA 240 Gr S31254 bar
ASME SA240/ASTM A240 UNS S31254 stainless steel sheetis tailored for industries requiring exceptional corrosion resistance in chloride-rich environments and high strength. Its high-alloy austenitic structure ensures durability in demanding applications.
Key ASME SA240/ASTM A240 UNS S31254 applications include:
Case Study: An oil and gas company in India used sa 240/a 240 uns s31254 sheets for offshore piping, achieving a 35% longer service life compared to sa 240/a 240 uns s31050 due to its superior pitting resistance.
Keywords: ASME SA240/ASTM A240 UNS S31254 applications, UNS S31254 uses, 254 SMO applications, ASME SA240 Gr S31254 applications
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