♦Standard

GB/T9808-2008

♦Grade

ZT380、ZT490、ZT52O、ZT540、ZT590、ZT640、ZT740

♦Size

33mm-340mm*2mm-28mm

♦Application

Suitable for geological core drilling, water well drilling, hydrogeological drilling.

Seamless steel pipe for coring drill pipe material,drill pipe joint material,drill collar material,engineering drilling casing material,core pipe material,casing coupling material,common drill pipe material,drill pipe joint material,and steel grain bit material,etc.

Mechanical properties

a、Steel grade ZT520 measures Rp0.5

b、 Steel grade ZT520 tensile specimens adopt S4, S5 or S6 in GB / T228