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Code
X90CrMoV18
US standard (AISI)
440B
Composition
Alloying components [%]
C: 0.85 - 0.95
Cr: 17.00 - 19.00
Mn: 0 - 1.00
Mo: 0.90 - 1.30
P: 0 - 0.04
S: 0 - 0.015 (0.030*)
Si: 0 - 1.00
V: 0.07 - 0.12
Remainder: Fe
Stainless steel grade
C-
Density [g/cm³]
7.7
Yield point
Rp0.2 [N/mm²]
≥550
Tensile strength
Rm [N/mm²]
≤800
Corrosion resistance
- Medium
- Resistant to freshwater and water vapour
Machinability
Poor
Weldability
Not suitable
Other properties
- Nickel-free martensitic ferromagnetic structure
- Stainless tool steel with high resistance to wear
- Temperable to 58 - 60 HRC (Rm: 1800 - 2000 N/mm²)
- Can be mechanically polished to a brilliant sheen
- Suitability for electropolishing: medium
Main uses
Predominantly used for equipment and parts that are subject to heavy wear stress and require a high level of hardness:
- Knives
- Surgical cutting tools, mould inserts and active elements for plastics processing work involving chemically aggressive moulding compounds
- Shaped and flat knives for processing food and fish
- Hardened valve seats
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