ASTM A240 Grade 431 Stainless Steel Plate 10 - 100mm Cutting SS Plate
Grade 431 stainless steels are martensitic, heat-treatable grades with excellent corrosion resistance, torque strength, high toughness and tensile properties. All these properties make them ideal for bolt and shaft applications. These steels, however, cannot be cold-worked owing to their high yield strength, hence they are suitable for operations such as spinning, deep drawing, bending or cold heading.
Fabrication of martensitic steels is generally carried out using techniques that allow hardening and tempering treatments and poor weldability. The corrosion resistance properties of grade 431 steels are lower than that of austenitic grades. The operations of grade 431 are limited by their loss of strength at high temperatures, due to over-tempering, and loss of ductility at negative temperatures.
Table 1. Composition ranges of grade 431 stainless steels
Grade | C | Mn | Si | P | S | Cr | Ni | |
431 | min. max. | - 0.20 | - 1 | - 1 | - 0.04 | - 0.03 | 15 17 | 1.25 2.50 |
Table 2. Mechanical properties of grade 431 stainless steels
Tempering Temperature (°C) | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness Brinell (HB) | Impact Charpy V (J) |
Annealed * | 862 | 655 | 20 | 285 max | - |
204 | 1345 | 1055 | 20 | 388 | 50 |
316 | 1295 | 1035 | 19 | 375 | 53 |
427 | 1350 | 1080 | 19 | 388 | # |
538 | 1140 | 965 | 19 | 321 | # |
593 | 1015 | 770 | 20 | 293 | 64 |
Table 4. Grade specifications of grade 431 stainless steels
Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
BS | En | No | Name | ||||
431 | S43100 | 431S29 | 57 | 1.4057 | X17CrNi16-2 | 2321 | SUS 431 |
Typical applications of grade 431 stainless steels include the following: