STPG38, STPG370, JIS Standard Carbon Steel Pipe
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Brass and Gold Metal Comparison, 황금과 황동
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ASTM, ASME Pipe, Tube Standard, Seamless
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STPG 370-JIS, SPPS 380-KS, Tubes for Pressure
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STKM20A Carbon Steels Tube for Machine
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STKM 11A, Tubes for Machine Structural Steel
STKM 11A Tubes for Machine Structural Steel STEELMAX Steel Story