China · YB

45B

YB/T 5221:1993 — Alloy structure steel round tube blank hot rolled and forged for making seamless tube

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YB/T 037:1993Quality structure cold-draw flat steels
YB/T 5132:1993Alloy structural steel sheets
YB/T 5301:2010Alloy structure steel wires
YB 481:1980YB 481
YB/T 037:2005Quality structure cold-draw flat steels
YB/T 5132:2007Alloy structural steel sheets
YB/T 5221:2014Alloy structure steel round tube blank hot rolled and forged for making seamless tube
YB/T 5221:1993Alloy structure steel round tube blank hot rolled and forged for making seamless tube
YB/T 5301:2006Alloy structure steel wires

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