Patent ID: 11945503
Assignee: ARCELORMITTAL
Field: Machine tools (Mechanical engineering)
Classification: CPC B  C | IPC B  C

Claim 31:
32. The welded steel blank as recited in claim 16, wherein for one of the precoated sheets, the steel of the steel substrate comprises, by weight:
0.24%≤C≤0.38%
0.40%≤Mn≤3%
0.10%≤Si≤0.70%
0.015%≤AI≤0.070%
0%≤Cr≤2%
0.25%≤Ni≤2%
0.015%≤Ti≤0.10%
0%≤Nb≤0.060%
0.0005%≤B≤0.0040%
0.003%≤N≤0.010%
0.0001%≤S≤0.005%
0.0001%≤P≤0.025%
wherein the titanium and nitrogen contents satisfy the following relationship:

Ti/N>3.42.

and the carbon, manganese, chromium and silicon contents satisfy the following relationship:, 2.6
     C
    
    +
    
     Mn
     
      5
      .
      3
     
    
    +
    
     Cr
     
      1
      ⁢
      3
     
    
    +
    
     Si
     
      1
      ⁢
      5
     
    
   
   ≥
   
    1.1
    %
   
  
  ,
 

the steel optionally comprising one or more of the following elements:
0.05%≤Mo≤0.65%
0.001%≤W≤0.30%%
0.0005%≤Ca≤0.005%
a rest being iron and impurities inevitably resulting from manufacturing; and
wherein for the other of the precoated sheets, the steel of the steel substrate comprises, by weight:
0.10%≤C≤0.5%
0.5%≤Mn≤3%
0.1%≤Si≤1%
0.01%≤Cr≤1%
Ti≤0.2%
Al≤0.1%
S≤0.05%
P≤0.1%
B≤0.010%
a rest being iron and impurities resulting from manufacturing.