Martensitic stainless steels
APX4
APX4W
Spécifications
EU
X4CrNiMo16-5-1
AIR
Z8CND17-04
ISO Symbol
X4CrNiMo16-5-1
ISO Num
1.4418
Composition
C
0.06
Ni
4
Cr
16
Mo
1
Applications
• Nuclear energy.
• Aerospace industry, marine applications.
• Chemical industry.
• Welded assembly-critical parts.
• Plastics processing industries.
Characteristics
• Martensitic stainless steel, equivalent to 18 % chromium steels in terms of corrosion.
• Resistant to sea water, saline atmosphere and salt spray.
• Very good resistance to organic acids and some mineral acids.
• Good weldability.
Mechanical properties
| Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
KCU (J/cm²) |
|---|---|---|---|---|
| T + Rv 400°C | 1200 | 950 | 16 | 100 |
| T + Rv 580°C | 1000 | 750 | 18 | 120 |
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 |