厚壁无缝钢管的生产工艺可分为冷拔、冷轧、热轧、热膨胀四种基本方法。用途分为无缝钢管结构;运输用无缝钢管;锅炉用无缝钢管;锅炉用高压无缝钢管;化肥设备用高压无缝钢管;地质钻探用无缝钢管;石油钻探用无缝钢管;石油裂解用无缝钢管;船舶用无缝钢管。 cold-drawn cold-rolled precision seamless steel pipes; various alloy pipes. Seamless steel pipes are represented by outer diameter and wall thickness. Thick-walled seamless steel pipes are mainly used for mechanical processing, coal mines, hydraulic steel, and many other purposes.