gost 10704-91 q235 电焊管 133毫米外径
俄标gost 10704-91 钢管
gost 10704-91 q235 电焊管 133毫米外径
gost 10704-91 q235 电焊管 133毫米外径
外径457-1422mm供应俄标gost 10704-91双面埋弧焊直缝钢管
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