♦Standard

GB/T17396

♦Grade

20、35、45、27SiMn, 30MnNbRE

♦Application

Suitable for manufacturing cylinders and columns of coal mine hydraulic supports and pillars

♦Size

60mm-356mm * 6mm-75mm

Common steel grades and chemical composition

Mechanical properties

a、 When the wall thickness is ≤ 16mm, the yield strength is 245MPa, when the wall thickness is ＞ 16-30mm, the yield strength is 235MPa

b、 When the wall thickness is ≤ 16mm, the yield strength is 305MPa, when the wall thickness is ＞ 16-30mm, the yield strength is 295MPa, when the wall thickness is ＞ 30mm, the yield strength 285MPa

c、c、 When the wall thickness is ≤ 16mm, the yield strength is 335MPa, when the wall thickness is ＞ 16-30mm, the yield strength is 325MPa, when the wall thickness is ＞ 30mm, the yield strength is 315MPa