Stainless steels with structural hardening
X17U4
X17U4W
Spécifications
Common name
17-4PH
630
630
EU
X5CrNiCuNb16 -4
USA
UNS: S17400
AMS
5643
5622
5622
ISO Symbol
X5CrNiCuNb16 -4
ISO Num
1.4542
WL
1.4548
ASTM grade
630
ASTM std
A564
Composition
C
< 0.07
Ni
4
Cr
16.5
Cu
4
O2
0.35
Applications
• Forgings and mechanical parts in stainless steel requiring very good mechanical properties and an acceptable coefficient of friction.
Characteristics
• Precipitation hardened martensitic stainless steel.
• Good resistance to various corrosive agents.
• Good weldability.
Mechanical properties
| Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
KV (J) |
|---|---|---|---|---|
| H + V 550°C | 1070 | 1000 | 10 | 120 |
| H + V 620°C | 950 | 750 | 16 | 140 |
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 |