Martensitic stainless steels
APX
Spécifications
Common name
431
EU
X17CrNi16-2
USA
UNS: S43100
AISI: 431
AISI: 431
AMS
5628
AIR
Z15CN17-03
ISO Symbol
X17CrNi16-2
ISO Num
1.4057
WL
1.4044
BS
S80
ASTM grade
431
ASTM std
A276
A479
F899
A479
F899
Composition
C
0.16
Ni
2
Cr
17
Applications
• Nuclear energy.
• Aerospace industry, marine applications.
• Chemical, oil and steam industries.
• Plastics processing industry.
• For the manufacture of welded parts, please use our APX®4 steel.
Characteristics
• Martensitic stainless steel, equivalent to 13 % chromium steel in terms of corrosion.
• Resistant to sea water, saline atmosphere and salt spray.
• Very good resistance to organic acids and some mineral acids.
• Very suitable where a high polish is required.
Mechanical properties
| Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
|---|---|---|---|
| T + Rv 400°C | 1400 | 1050 | 13 |
| T + Rv 630°C | 1000 | 750 | 15 |
Key to heat treatment symbols
| Solution treated | H | Annealed | R |
|---|---|---|---|
| Thermo-mechanical treatment | TM | Quenched and tempered | T+RV |
| Sub-zero treatment | F | Solution treated and aged | H+V |