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发明公开
CN103521549A 一种X100高钢级大口径厚壁直缝埋弧焊管的制造方法 有权 转让

一种X100高钢级大口径厚壁直缝埋弧焊管的制造方法
摘要：
本发明公开了一种X100高钢级大口径厚壁直缝埋弧焊管的制造方法，包括：钢板超声波检验、铣边、预弯边、JCO成型、预焊、内焊、外焊、焊缝X射线检测、钢管扩径、静水压试验、焊缝超声波检测、管端X射线检测、倒棱、管端磁粉检测、外观质量检查。所述精焊工艺为内外焊四丝埋弧自动焊。采用此方法制造的X100高钢级大口径厚壁直缝埋弧焊管不仅具有低温冲击韧性高、焊接接头力学性能优良等特点，同时具有较高的管体均匀延伸率。
摘要（英）：

The invention discloses a manufacturing method of an X100 high-steel-grade large-opening-diameter thick-wall longitudinal submerged-arc welded pipe. The manufacturing method comprises steel plate ultrasonic inspection, edge milling, edge pre-bending, JCO forming, pre-welding, inner welding, outer welding, welding line X-ray inspection, steel pipe diameter expanding, hydrostatic pressure testing, welding line ultrasonic inspection, pipe end X-ray inspection, chamfering, pipe end magnetic particle testing, and appearance quality inspection. A refined welding process comprises inner and outer welding four-wire submerged-arc automatic welding. The X100 high-steel-grade large-opening-diameter thick-wall longitudinal submerged-arc welded pipe manufactured by the method not only has the characteristics of high low-temperature impact toughness, good welding joint mechanical properties and the like, but also has relatively high pipe body uniform elongation rate.

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