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Q195 A53 Gr.A S195T STK400 Carbon Steel Structure Pipe | Low Carbon Steel Tube
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Q235B A36 A53 Gr.B S235JR STK490 Carbon Steel Pipe | Structural Carbon Steel Tube
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20# A106 Gr.B P265GH STPG370 Carbon Steel Pipe | Seamless Fluid Boiler Tube
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45# A106 Gr.C STPG410 Carbon Steel Pipe | High Strength Mechanical Structure Tube
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