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Steel similar to the previous one: the greater carbon content makes welding more difficult, but favors temperability.
RK4 RK4S
RKS RKSPb
RK0S RK0SPb
RD6 RD6Pb
RK1 RK1Pb
50CrMo4
RB2 RB2Pb
34CRNIMO6
30CRNIMO8
46CRB2
21CRMOV5-7
31CRMOV9
32CRB4
34CRS4
36CRB4
37CRS4
51CRV4
A105 K105
RK1 B7 A193 B7M
A193 B16
A320 L7 L7M
A320 L43