ALTA A8 steel is a medium carbon, air-hardening tool steel that is characterized by a combination of very good toughness, intermediate wear resistance, and excellent dimensional stability in heat treatment. It has been used for punches that operate in the 55 to 60 Rockwell C hardness range. Better toughness than A2 or D2 steel, and higher wear resistance than S7 steel, its deformation is very stable in heat treatment.
Applications
²Commonly used in the production of cutting tools in the fields of papermaking, wood processing, sugar making, etc. Others tools like forming rollers, punches, chuck jaws, precision stamping dies… etc.
Chemical composition
Chemical Composition per %
C
Si
Mn
P
S
Cr
Mo
W
Ni
Cu
Min.
0.50
0.75
0.20
4.75
1.15
1.00
Max.
0.60
1.10
0.50
0.030
0.030
5.50
1.65
1.45
0.25
0.30
Basic melting process :
IM/EAF + LF + VD + (ESR)
Hardness :
Max 240 HB (annealed)
Reduction ratio :
5 : 1 minimum or required
Grain size :
≥ 6.0 per ASTM E112
Non-metallic inclusion :
≤ 1.0 (thick), ≤ 1.5 (thin) per ASTM E45 method A (more pure by ESR route)
