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Dive into the exceptional performance of sa240/a240 uns s43940, a top-tier ferritic stainless steel sheet supplied by Gangsteel, a trusted uns stainless supplier. Compliant with sa240/a240 uns stainless grades standards, including ASTM A240 and ASME SA240, UNS S43940 is engineered for superior corrosion resistance, excellent weldability, and moderate strength, making it a prime choice for automotive exhaust systems, industrial equipment, and architectural applications.Gangsteel delivers precision-crafted solutions to clients worldwide with rapid turnaround.
Gangsteel explores the ASME SA240/ASTM A240 UNS S43940 properties, detailing its chemical composition, density, mechanical properties, corrosion resistance, weldability, surface finishes, equivalent materials, specifications, applications, and competitive pricing per kg. Tailored for engineers and procurement specialists, UNS S43940 offers a reliable, cost-effective solution. Discover complementary grades like sa240/a240 uns s41003 to meet diverse project requirements.
ASME SA240/ASTM A240 UNS S43940, a ferritic stainless steel, boasts 17.0-19.0% chromium and titanium stabilization (0.2-1.0%), delivering excellent corrosion resistance, superior weldability, and moderate strength. Designed for applications such as automotive exhaust systems, industrial equipment, and architectural panels, it benefits from titanium stabilization and low carbon content (≤ 0.03%), which prevent carbide precipitation during welding, outperforming non-stabilized grades like sa240/a240 uns s43000. Its ferritic structure ensures robust scaling resistance up to 815°C (1500°F).
Compared to sa240/a240 uns s41008, UNS S43940 offers enhanced corrosion resistance due to higher chromium content, and it is more cost-effective than high-alloy grades like sa240/a240 uns s44400. While less resistant to severe chloride environments, its weldability and affordability make it ideal for automotive and industrial applications, leveraging Gangsteel’s expertise in high-performance alloys.
Key benefits include:
Case Study: An Indian automotive manufacturer used UNS S43940 sheets for catalytic converters, achieving a 30% reduction in welding defects compared to sa240/a240 uns s41003 due to its titanium stabilization.
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The density of ASME SA240/ASTM A240 UNS S43940 is approximately 7.70 g/cm³ (0.278 lb/in³), typical for ferritic stainless steels with low nickel and titanium stabilization. This density supports precise weight calculations for applications like automotive exhausts, aligning with sa240/a240 uns s43932 (7.70 g/cm³) and slightly less than sa240/a240 uns s42035 (7.75 g/cm³).
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ASME SA240/ASTM A240 UNS S43940offers excellent corrosion resistance in mild to moderately corrosive environments, driven by its 17.0-19.0% chromium content and titanium stabilization, with a pitting resistance equivalent number (PREN) of ~17.0-19.0. Ideal for automotive exhausts and industrial equipment, it outperforms sa240/a240 uns s41008 but is less resistant to severe chloride environments compared to sa240/a240 uns s44400. Its high-temperature oxidation resistance is comparable to sa240/a240 uns s43000.
Keywords: ASME SA240/ASTM A240 UNS S43940 corrosion resistance, UNS S43940 corrosion properties
The low carbon content (≤ 0.03%) and titanium stabilization (0.2-1.0%) ensure ASME SA240/ASTM A240 UNS S43940 has superior weldability, minimizing carbide precipitation and intergranular corrosion. It outperforms non-stabilized grades like sa240/a240 uns s42900 and matches sa240/a240 uns s43035 in performance. Suitable for TIG, MIG, and shielded metal arc welding, it uses titanium-stabilized or low-carbon ferritic fillers to maintain integrity.
Keywords: ASME SA240/ASTM A240 UNS S43940 weldability, UNS S43940 welding properties
Surface finishes enhance the versatility of ASME SA240/ASTM A240 UNS S43940 for automotive and industrial applications:
|
Surface Finish |
Definition/Feature |
Summary of Manufacturing Method |
Application/Use |
|---|---|---|---|
|
NO.1 |
Silver white, matte |
Hot rolled, heat treated, and pickled |
Industrial tanks, pipes, no gloss needed |
|
2B |
Stronger gloss than NO.2D |
Cold rolled, heat treated, pickled, lightly polished |
Automotive exhausts, industrial equipment |
|
NO.2D/2BB |
Silver white |
Cold rolled, heat treated, pickled |
Deep-drawn components, general materials |
|
NO.3 |
Rough grinding |
Polished with 100-120# abrasives (JIS R6001) |
Building materials, automotive components |
|
NO.4 (4K) |
Intermediate grinding |
Polished with 150-180# abrasives (JIS R6001) |
Architectural panels, industrial components |
|
NO.240 |
Fine grinding |
Ground with 240# abrasive belt |
Precision components, decorative parts |
|
NO.320 |
Very fine grinding |
Ground with 320# abrasive belt |
High-end industrial components |
|
NO.400 |
Gloss close to BA |
Polished with 400# wheel |
Decorative trim, industrial fittings |
|
HL |
Hairline, continuous streaks |
Polished with 150-240# abrasive for hairline effect |
Architectural cladding, structural components |
|
BA (No.6/BA1/BA0) |
Mirror-like, bright |
Cold rolled with bright heat treatment |
Decorative surfaces, high-end fittings |
|
NO.7 |
Near-mirror polishing |
Polished with 600# rotary wheel |
Art installations, decorative applications |
|
NO.8 (Mirror/8K) |
Shining mirror finish |
Polished with fine wheels |
Reflectors, architectural accents |
These finishes make sa240/a240 uns s43940 versatile for applications like 2B for exhaust systems or BA for decorative panels.
Keywords: ASME SA240/ASTM A240 UNS S43940 surface finish, UNS S43940 stainless steel surface
The ASME SA240/ASTM A240 UNS S43940 chemical composition is optimized for corrosion resistance and weldability, compliant with sa240/a240 uns stainless grades.
|
Element |
Percentage (%) |
|---|---|
|
Chromium (Cr) |
17.0 – 19.0 |
|
Titanium (Ti) |
0.2 – 1.0 |
|
Carbon (C) |
≤ 0.03 |
|
Manganese (Mn) |
≤ 1.0 |
|
Silicon (Si) |
≤ 1.0 |
|
Phosphorus (P) |
≤ 0.040 |
|
Sulfur (S) |
≤ 0.030 |
|
Nickel (Ni) |
≤ 0.5 |
|
Nitrogen (N) |
≤ 0.03 |
|
Iron (Fe) |
Balance (~80%) |
Keywords: ASME SA240/ASTM A240 UNS S43940 chemical composition, UNS S43940 composition, ASME SA240 Gr S43940 composition
The ASME SA240/ASTM A240 UNS S43940 mechanical properties balance strength and ductility, ideal for automotive and industrial applications. Annealing at 815-900°C (1500-1650°F) optimizes performance.
|
Property |
Value at 20°C |
|---|---|
|
Tensile Strength (MPa) |
≥ 415 (60 ksi) |
|
Yield Strength (MPa) |
≥ 275 (40 ksi) |
|
Elongation (%) |
≥ 20 |
|
Hardness (HBW) |
≤ 183 |
|
Density |
7.70 g/cm³ (0.278 lb/in³) |
Clients have leveraged sa240/a240 uns s43940 for industrial panels, benefiting from its corrosion resistance compared to sa240/a240 uns s41045.
Keywords: ASME SA240/ASTM A240 UNS S43940 mechanical properties, UNS S43940 strength, ASME SA240 Gr S43940 mechanical properties
Gangsteel supplies sa240/a240 uns s43940 in various forms, compliant with ASTM A240 and ASME SA240:
Note: Contact admin@gangsteel.com for custom sizes or finishes.
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ASME SA240/ASTM A240 UNS S43940excels in corrosion-resistant applications:
Case Study: An Indian manufacturer used UNS S43940 for exhaust systems, saving 25% compared to sa240/a240 uns s44400.
Keywords: ASME SA240/ASTM A240 UNS S43940 applications, UNS S43940 uses, ASME SA240 Gr S43940 applications
This table compares sa240/a240 uns s43940 with six ferritic grades:
|
Property |
UNS S43940 |
UNS S41003 |
UNS S41008 |
UNS S42900 |
UNS S43000 |
UNS S43035 |
UNS S43932 |
|---|---|---|---|---|---|---|---|
|
UNS Number |
S43940 |
S41003 |
S41008 |
S42900 |
S43000 |
S43035 |
S43932 |
|
Type |
Ferritic |
Ferritic |
Ferritic |
Ferritic |
Ferritic |
Ferritic |
Ferritic |
|
Chromium Content |
17.0-19.0% |
10.5-12.5% |
11.5-13.5% |
14.0-16.0% |
16.0-18.0% |
17.0-19.0% |
17.0-19.0% |
|
Nickel Content |
≤ 0.5% |
≤ 1.0% |
≤ 0.60% |
≤ 0.75% |
≤ 0.75% |
≤ 0.5% |
≤ 0.5% |
|
Manganese Content |
≤ 1.0 |
≤ 1.5 |
≤ 1.0 |
≤ 1.0 |
≤ 1.0 |
≤ 1.0 |
≤ 1.0 |
|
Molybdenum Content |
- |
- |
- |
- |
- |
- |
- |
|
Nitrogen Content |
≤ 0.03% |
≤ 0.03% |
- |
- |
- |
≤ 0.03% |
≤ 0.03% |
|
Carbon Content |
≤ 0.03% |
≤ 0.03% |
≤ 0.08% |
≤ 0.12% |
≤ 0.12% |
≤ 0.03% |
≤ 0.03% |
|
Corrosion Resistance |
Excellent |
Good |
Good |
Good |
Good |
Excellent |
Excellent |
|
Strength |
Moderate |
Moderate |
Moderate |
Moderate |
Moderate |
Moderate |
Moderate |
|
Temp Range |
Up to 815°C |
Up to 650°C |
Up to 650°C |
Up to 675°C |
Up to 815°C |
Up to 815°C |
Up to 815°C |
|
Cost (USD/kg) |
3-5 |
2.5-4 |
3-5 |
3-5 |
3-5 |
3-5 |
3-5 |
|
Applications |
Automotive exhausts, industrial |
Structural supports |
Automotive, industrial |
Appliances |
Appliances |
Automotive exhausts |
Automotive exhausts |
Conclusion: Select UNS S43940 for weldable, corrosion-resistant automotive exhausts, or consider sa240/a240 uns s41500 for high-strength applications.
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ASME SA240/ASTM A240 UNS S43940aligns with global standards, ensuring versatility across regions.
|
Standard |
Grade |
|---|---|
|
UNS |
S43940 |
|
W.Nr. |
1.4509 |
|
EN |
X2CrTiNb18 |
|
GB |
022Cr18TiNb |
|
JIS |
SUS 441 |
|
ASTM |
A240 |
|
ASME |
SA240 |
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Per ASME BPVC Section II, Part D, ASME SA240/ASTM A240 UNS S43940 ensures reliable performance in moderately corrosive environments.
|
Temperature (°C) |
Allowable Stress (MPa) |
|---|---|
|
100 |
115 |
|
200 |
105 |
|
300 |
95 |
|
400 |
85 |
|
500 |
75 |
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The ASME SA240/ASTM A240 UNS S43940 price per kg ranges from USD 3-5 per kg (FOB), driven by alloy content, market demand, product form, and global supply chain factors. It is competitive with sa240/a240 uns s43932 and approximately 20-30% less expensive than sa240/a240 uns s44400. Contact admin@gangsteel.com for precise quotes.
Keywords: ASME SA240/ASTM A240 UNS S43940 price per kg, UNS S43940 cost
Gangsteel’s sa240/a240 uns stainless grades portfolio includes a wide range of grades to complement sa240/a240 uns s43940:
Note: These grades complement sa240/a240 uns s43940 for various applications. Contact Gangsteel for a full catalog.
Keywords: ASME SA240/ASTM A240 UNS S43940 related grades, UNS S43940 stainless steel grades
Q: How does UNS S43940 compare to UNS S43035, and what are the key differences in their applications?
A: Both sa240/a240 uns s43940 and sa240/a240 uns s43035 are ferritic stainless steels with excellent weldability due to titanium stabilization and low carbon content (≤ 0.03%). UNS S43940 (often equivalent to SUS 441) includes niobium in addition to titanium, which slightly enhances its resistance to intergranular corrosion and high-temperature stability compared to UNS S43035 (SUS 439). Both grades have similar chromium content (17.0-19.0%), providing excellent corrosion resistance in mild to moderately corrosive environments. However, UNS S43940 is often preferred for automotive exhaust systems due to its enhanced stabilization, which improves weld integrity in high-temperature applications. UNS S43035 is also used in exhaust systems but is more commonly applied in industrial equipment where aesthetic finishes are less critical. For projects requiring slightly higher corrosion resistance, UNS S43940 may be the better choice due to its dual stabilization.
Q: Is UNS S43940 suitable for automotive exhaust systems, and how does it compare to UNS S41000 in this application?
A: Yes, sa240/a240 uns s43940 is highly suitable for automotive exhaust systems, including mufflers, catalytic converters, and exhaust pipes, due to its excellent corrosion resistance, superior weldability, and high-temperature scaling resistance up to 815°C (1500°F). Its titanium and niobium stabilization prevents carbide precipitation, ensuring strong welds in high-heat environments. In contrast, sa240/a240 uns s41000, a martensitic stainless steel, has higher strength (tensile strength ≥ 450 MPa vs. 415 MPa for UNS S43940) but poorer weldability due to higher carbon content (≤ 0.15%) and lack of stabilization, making it prone to weld cracking and intergranular corrosion. UNS S43940 is preferred for exhaust systems where weldability and corrosion resistance are critical, while UNS S41000 is better suited for high-strength, non-welded components like structural supports.
Q: What is the price difference between UNS S43940 and UNS S44400, and what factors influence this difference?
A: The price of sa240/a240 uns s43940 typically ranges from USD 3-5 per kg (FOB), while sa240/a240 uns s44400 is approximately 20-30% more expensive, ranging from USD 3.6-6 per kg. This price difference is primarily due to UNS S44400’s higher alloy content, including 1.75-2.5% molybdenum and titanium/niobium stabilization, which enhances its corrosion resistance in chloride-rich environments (PREN ~20.5-24.5 vs. ~17.0-19.0 for UNS S43940). Factors influencing the price include alloy composition (molybdenum increases costs), market demand (higher for UNS S44400 in chemical processing), product form (sheets vs. coils), and global supply chain dynamics (e.g., raw material availability and freight costs). For cost-sensitive applications like automotive exhausts, UNS S43940 offers a compelling balance of performance and affordability.
Q: Can UNS S43940 be used in high-temperature environments, and how does its heat resistance compare to UNS S44500?
A: Yes, sa240/a240 uns s43940 is suitable for high-temperature environments, with excellent scaling resistance up to 815°C (1500°F), making it ideal for automotive exhausts and industrial heat exchangers. Its ferritic structure and titanium/niobium stabilization ensure stability at elevated temperatures, preventing sensitization. Compared to sa240/a240 uns s44500, which has a higher chromium content (20.0-22.0%) and a slightly higher temperature range (up to 850°C or 1562°F), UNS S43940 has comparable but slightly lower heat resistance. UNS S44500 is better suited for applications requiring prolonged exposure to higher temperatures, such as chemical processing equipment, while UNS S43940 excels in applications where weldability is critical, such as welded exhaust components.
Q: What welding techniques are recommended for UNS S43940, and how does its weldability compare to UNS S41500?
A: sa240/a240 uns s43940 is highly weldable due to its low carbon content (≤ 0.03%) and titanium/niobium stabilization, which minimize carbide precipitation and intergranular corrosion. Recommended welding techniques include TIG (Tungsten Inert Gas), MIG (Metal Inert Gas), and shielded metal arc welding, using titanium-stabilized or low-carbon ferritic fillers (e.g., AWS E309L or E312) to maintain corrosion resistance and strength. Preheating is typically unnecessary, but post-weld annealing at 815-900°C (1500-1650°F) can optimize performance. In contrast, sa240/a240 uns s41500, a martensitic stainless steel, has poorer weldability due to its higher carbon content (≤ 0.05%) and lack of stabilization, requiring preheating (150-200°C) and post-weld heat treatment to prevent cracking. UNS S43940 is preferred for applications requiring robust welds, such as exhaust systems, while UNS S41500 is better for high-strength, non-welded components.
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Reach out to Gangsteel at admin@gangsteel.com for quotes, technical data, or custom solutions for sa240/a240 uns s43940.
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