ALTA 1.4057 / 431 steel is a type of martensitic stainless steel which combined with good strength and toughness, It has good corrosion resistance to oxidizing acids, most organic acids and aqueous solutions of organic salts.
Applications
²Manufacturing of nitric acid, acetic acid and light industry, textile and other industries that require both toughness and corrosion resistance of shafts, piston rods, pumps and other parts
²Glass moulds (ESR quality)
Chemical composition
Chemical Composition per %
C
Si
Mn
P
S
Cr
Ni
Cu
Min.
0.12
15.0
1.50
Max.
0.22
1.00
1.50
0.030
0.030
17.0
2.50
0.25
Basic melting process :
IM/EAF + LF + VD + (ESR)
Hardness :
Max 285 HB (annealed), Or QT800/QT900
Reduction ratio :
5 : 1 minimum or required
Grain size :
≥ 5.0 per ASTM E112
Non-metallic inclusion :
≤ 1.0 (thick), ≤ 1.5 (thin) per ASTM E45 method A (more pure by ESR route)
