Production API5L, 10 #, 20 #, 16Mn, 45 #, 27SiMn, X42, X52-X60.37mn5, p110, l80, n80 hot rolled seamless steel pipe ∮ 140 - ∮ 273 * 6-26mm casing api5ct ∮ 139.7- ∮ 273.5; double submerged arc spiral steel pipe, specifications ∮ 219 - ∮ 3520 * 6-25mm; production of ERW straight seam steel pipe ∮ 140 - ∮ 630 * 6-18mm; and thermal expansion of steel. [168 * 6-20 in the production of seamless pipe, there are plans to contact please contact}