Luois Metals is a reliable manufacturer and supplier of high-performance Stainless Steel 431 Rectangular Bars, proudly based in Houston, USA. This type of stainless steel is martensitic, renowned for its impressive tensile strength, corrosion resistance, and toughness, especially after heat treatment. Our SS 431 rectangular bars are precision-machined to comply with ASTM A276 and A479 standards, making them perfect for applications that require a strong, durable, and corrosion-resistant material. We offer these bars in various sizes and custom dimensions, catering to industries like aerospace, marine, defense, oil & gas, and mechanical engineering.
Stainless Steel 431 is composed of 15.5–17.5% chromium, 1.25–2.5% nickel, and a maximum of 0.20% carbon, allowing it to undergo heat treatment for enhanced strength and hardness. After treatment, it can achieve a tensile strength of up to 850 MPa and a yield strength of around 520 MPa. SS 431 is magnetic, has moderate machinability, and shows strong resistance to oxidation, corrosion, and stress-related cracking. Its mechanical stability and toughness at high temperatures make it suitable for demanding, corrosive environments. The rectangular shape provides versatility for both structural and component applications.
Stainless Steel Rectangular Bar Specification : ASTM A276 / A479, ASME SA276 / A479
Dimension Standard : EN, DIN, JIS, ASTM, BS, ASME, AISI
Size : 14mm-300mm
Thickness : 50 mm to 6000 mm Long
Length : 1 To 6 Meters, Custom Cut Length
Form : Round, Square, Hex(A/F), Rectangle, Billet, Ingot, Forging Etc.
| 431 | Max | Min |
| C | 0.20 | – |
| Cr | 17.00 | 15.00 |
| Fe | Balance | – |
| Mn | 1.00 | – |
| Ni | 2.50 | 1.25 |
| P | 0.040 | – |
| S | 0.030 | – |
| Si | 1.00 | – |
|
Typical Mechanical Properties at Elevated Temperatures, Hardened at 1010oC and Tempered at 30oC Above Working Temperature |
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Tempering Temperature oC |
510 |
570 |
620 |
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|
Working Temperature oC |
480 |
540 |
590 |
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|
Tensile Strengt Mpa |
1350 |
720 |
435 |
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|
Elongation in 50mm % |
15 |
20 |
26 |
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|
Room Temperature Hardness after Test |
HB |
440 |
330 |
280 |
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|
Rc |
47 |
37 |
30 |
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Grade |
UNS No |
Old British |
Euronorm |
Swedish SS |
Japanese JIS |
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|
BS |
En |
No |
Name |
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|
431 |
S43100 |
431S29 |
57 |
1.4057 |
X17CrNi16-2 |
2321 |
SUS 431 |
Stainless Steel 431 Rectangular Bars find extensive use in applications that demand high strength, toughness, and moderate to good corrosion resistance. They are commonly used in pump and valve parts, marine shafts, aerospace fasteners, gear components, structural supports, and high-performance mechanical parts. SS 431 excels in mildly corrosive environments like marine atmospheres, saltwater spray, and chemical processing plants. Its rectangular form is perfect for precision-machined parts and load-bearing components in sectors such as construction, defense, and power generation. Luois Metals also offers custom-cut 431 rectangular bars with tight tolerances to meet specific needs.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Louis Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Houston, USA
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