Soft Annealed Surface Black Hot Rolled SS AISI 431 Round Shaft Dia185MM For Glass Moulds
Stainless Steel Grade 431
Technical Data Sheet
Alloy 431 is the most corrosion resistant of the martensitic grades. Due to Alloy 431's excellent tensile and torque strength and good toughness it is used in structural parts that are exposed to marine atmosphere, also for aircraft fasteners and fittings.
| Chemical Composition Limits |
| Weight% | C | P | Si | Ni | Mn | S | Cr | Fe | Mo | Cu | N |
| Alloy 431 | 0.12-0.17 | 0.040 max | 0.20-0.60 | 2-3 | 0.3 | 0.030 | 15.50-16.50 | Bal | 0.25 | 0.50 | 0.10 |
Typical Mechanical Properties
| Material | Condition | Tensile Strength (MPa) | Proof Stress 0.2% (MPa) | Elongation 2"% | Reduction of Area | Brinell Hardness |
| Alloy 431 | Alloy 431 Annealed | 862 | 655 | 20 | 55 | 260 |
| Alloy 431 | Alloy 431 Heat Treated AMS 5628 | 1379 | 1034 | 10 | 40 | - |
Availability
Grade 431 is available in Bar (Round), Strip, Wire, Rod, Billet. For all stock availability contact Sales.
Specifications
Grade 431 Stainless Steel Bar, Wire, Forgings, Tube
AMS 5628 Bars / wire / forgings
AMS-S-18732
MIL-S-18732
QQ-S-763
ASTM A276 / ASME SA276
ASTM A478 / ASME A478
ASTM A314 / ASME SA314
ASTM A484 / ASME SA484
ASTM A580 / ASME SA580
BS 7S80
BS 970; 431S29
EN57
UNS S43100
DMS-1565
stainless steel 431 Corrosion Resistance
Excellent resistance to a wide variety of corrosive media. Reasonable resistance to salt water in cold southern waters but less resistant than SUS316 in tropical waters. Overall the corrosion resistance of SUS431 is approximately the same as or slightly below that of SUS304.
Performance is best with a smooth surface finish, in the hardened and tempered condition.
431 stainless steel Heat Resistance
Resists scaling in intermittent service to 925°C and in continuous service to 870°C, but is generally not recommended for use in temperatures above the relevant tempering temperature, because of reduction in mechanical properties.
431 stainless steel Heat Treatment
Full anneal – not practical for this grade – it hardens even when cooled slowly.
Process Anneal – heat to 620-660°C and air cool.
Hardened by heating to 980-1065°C, holding for about 1/2 hour then quenching in air or oil. Pre-heating at 760-790°C may be useful for complex parts or those already hardened. Temper to suit mechanical requirements, at temperatures as indicated in the accompanying table.
The tempering range 425-600°C should be avoided due to reduced impact toughness, although the effect is less marked than in most other martensitic grades.
