What is sus 431 material?
SUS 431 is a martensitic stainless steel known for its high strength, excellent toughness, and good corrosion resistance, especially against strong oxidizing acids. It contains chromium (15.0-17.0%) and nickel (1.25-2.50%) and is commonly used in applications requiring high mechanical properties, such as aerospace components, bolts, pump shafts, and marine equipment.
Equivalent Grades of 431 Stainless Steel
431 stainless steel shares similar chemical composition and mechanical properties with equivalent grades used in other countries. These grades provide comparable performance across various applications. Below is a table of equivalent grades from different regions.
| Standard | Equivalent Grade | Country |
| JIS | SUS 431 | Japan |
| GB/T | 1Cr17Ni2 | China |
| EN | X17CrNi16-2 (1.4057) | EU |
| DIN | X17CrNi16-2 | Germany |
| GOST | 14Kh17N2 | Russia |
431 stainless steels Chemical Composition:
| Grade | C | Mn | P | S | Si | Cr | Ni |
| 431 | 0.12-0.22 | 1.50 max | 0.040 max | 0.030 max | 1.00 max |
15.0- 17.0 |
1.50- 2.50 |
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 |
|
650 |
960 |
695 |
20 |
277 |
84 |
physical properties of grade 431 stainless steels
|
Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion (μm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat |
Electrical Resistivity (nΩ.m) |
|||
|
0-100°C |
0-315°C |
0-538°C |
at 100°C |
at 500°C |
|||||
|
431 |
7800 |
200 |
10.2 |
12.1 |
- |
20.2 |
- |
460 |
720 |
What is the difference between 316 and 431 stainless steel?
The main difference is that 316 is an austenitic stainless steel with superior corrosion resistance, especially in chloride environments, due to its molybdenum content, while 431 is a martensitic stainless steel that is magnetic and much stronger, making it ideal for high-stress applications after heat treatment.
Heat treatment:
Condition: Annealed, Quenched+tempered
Hardness: 600(QT800), 700(QT900)
Tensile strength: 800-950(QT800), 900-1050(QT900)
Elongation after fracture:12％-14％
Alternative Grades to 431 Stainless Steel
Due to similar composition or applications, the following stainless steel grades can replace 431 stainless steel:
410 Grade: Martensitic stainless steel containing chromium. It has good corrosion resistance and strength, but slightly lower toughness than 431 stainless steel.
420 Grade: Higher carbon content than 431 stainless steel. Higher hardness after heat treatment, suitable for wear-resistant applications, but poorer corrosion resistance.
316 Grade: Higher molybdenum content than 431 stainless steel. Better corrosion resistance, especially in marine environments, but lower strength.
Delivery Condition:
Annealed , Hot forged+annealed
Surface Condition:Black, Grinded, Peeled, Rough turned, Polished
Features:1.Competitive price
2.Immediate delivery
3.Premium quality
4.Reliable service
5.MOQ: 1 Ton
| Packing details | In seaworthy packing, as your requirement. |
| Delivery details | within 30-50 day |
