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· KSTB35 KSTB42 320 360 410 460 TS6/TW6 -rs10 TWIO 360 410 510 320 360 410 . GB/T 8162 45 , 10, 40Cr GB/T 10, 20, 35, 35CrM0 8163 Seamless steel tubes for structural purposes
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