ASTM A106 / ASTM A53 20MnG 25MnG U Bend Welded Tube With Heat Treatment Quick Detail: 1,Standards: ASTM A179 (ASME SA179) ASTM A210 2,Grade: A179 A210-A1 T11 T22 T91 T12 etc Size: (mm) OD: 31.75mm WT...
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