ASTM A105 is a Carbon Steel material spec used in forged fittings, such as 2000# or higher socket weld or threaded fittings, forged flanges, etc..
ASTM A197 is a Malleable iron material spec used in 150# socket weld or threaded fittings.
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Astm a36. Its rot rolled steel with nearly matching with astm a36.
Astm a-36
Basically there is no difference as pipe is ussually stenciled with both standards.
ASTM A216 WCC is a steel casting (carbon).
Is ASTM A105 equivalent to Stainless Steel 439