Grade A has lower carbon content, is a softer steel and easier to bend. Grade B has higher carbon content and tensile strength than Grade A and Grade C has higher tensile strength than Grade B.
ASTM A106 Grade A 0.25% C (max) 0.1% Si SMYS 30ksiASTM A106 Grade B
0.30% C (max)
0.1% Si
SMYS 35ksiASTM A106 Grade C
0.35% C (max)
0.1% Si
SMYS 40ksiASTM A106 Grade B steel pipes are used for process areas and are more expensive than ASTM A53 Grade B pipes, which are used for offsite and building pipes and are 25-30% cheaper. ASTM A106 is generally used for process plants while ASTM A53 Grade B can be used for transporting oil, water or gas at temperatures not below 20F and save around 25-30% in cost compared to ASTM A106.
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