No 63,Yongji Road, Cangzhou, Hebei, China,
Seamless tube company executive GB / T8162, GB / T8163, GB / T3087, GB / T6479, American Standard ASTM A106/ A53API5L, ASTM A179, ASTM A192, ASTM A210-A1, ASTM A333Gr.6, the German standard DIN 17175, DIN1629 / 2448, DIN2391, JIS G3461, JIS standard, JIS