A513 ERW Carbon and Alloy Mechanical Tubing steelmax2019-01-09T11:13:49+09:003월 21st, 2018| ASTM A513은 탄소강과 합금강 강관으로 ERW(Electric-Resistance-Welded) Tube 규격입니다. A513 Standard Specification for Electric-Resistance Welded