what is the difference between type -a and type -b iron

what is the difference between type -a and type -b iron >
The chemical compostion is given here under and also guide
us the effect of Ni;Cr;Mo in the iron; name and use of
these two types of iron
Type a Type b
%C :3.15 2.65
%Mn:0.41 0.52
%Si:1.72 1.60
%S :0.090 0.082
%P: 0.215 0.204
%Ni: 0.40 Traces
%Cr : 0.49 Traces
%Mo : Traces Traces

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