431 stainless steel is a high chromium-low nickel high hardenability Martensitic stainless steel with high strength and good corrosion resistance, as generally supplied hardened and tempered in the tensile range 850 – 1000 Mpa (condition T) Brinell range 248 – 302. Characterised by very good corrosion resistance in general atmospheric corrosive environments, good resistance to mild marine and industrial atmospheres, resistant to many organic materials, nitric acid and petroleum products coupled with high tensile and high yield strength plus excellent toughness in the hardened and tempered condition.
ASTM A276 431 Stainless Steel Bars Equivalent Grades
| STANDARD | UNS | WERKSTOFF NR. | JIS | BS |
| SS 431 | S43100 | 1.4057 | SUS 431 | BS970 431S29 / 431S29T |
UNS S43100 Stainless Steel Round Bars Chemical Composition
| Grade | C | Ni | Si | S | Mn | P | Cr | Mo | |
| SS 431 | min. | 0.12 | 1.25 | - | - | - | - | 15.00 | - |
| max. | 0.20 | 3.00 | 1.00 | 0.03 | 1.0 | 0.04 | 18.00 | - |
Stainless Steel WERKSTOFF NR. 1.4057 Rods Mechanical Properties
| Grade | Tensile Strength (ksi) min | Elongation (% in 50mm) min | Yield Strength 0.2% Proof (ksi) min | Hardness |
| 431 | 850 | 11 | 635 | 302 |
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