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ningbo,China
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GB/T9808 STM-R780 High Straightness Seamless Cold Drawn Steel Tube For Drilling
GB9948 Cold Drawn 20# Alloy Carbon Pipe Petroleum Cracking Steel Tube
GB9948 Petroleum Cracking Seamless Steel Tubes 10#20# 12CrMo 15CrMo 12Cr1MoV
Round Anti Rust Seamless Steel Pipes For Precision Applications GB/T 3639
High Pressure Seamless Steel Tubes for Diesel Engine GB/T 3093
Carbon - Manganese Steel Seamless Steel Tubes / Pipes for Ship GB/T 5312
GB 6479 Carbon Steel Seamless Steel Tube for Chemical Fertilizer Equipment
Seamless Straightness Steel Tubes for Drilling GB/T 9808 37SiMn 38CrMoAl
Seamless Steel Tubes for Low and Medium Pressure Boiler GB 3087
ASTM A179 Cold-Drawn Low-Carbon Seamless Steel Tube for Heat-Exchanger and
Hot Rolling Seamless Carbon Steel Pipe For Liquid Service GB / T 8163 10 20
Seamless Steel Tubes and Pipes for High Pressure Boiler GB 5310