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一、前言近年来,高频直缝电焊钢管生产技术发展很快,正向大型化、厚(薄)壁化、高级化、高速化和自动化方向发展,并取得了可喜的成果。现在日本已经生产Φ660.4mm(26吋)大直径高频电焊钢管(以下简称电焊钢管)。电焊钢管的材质已由普碳钢向低合金
I. INTRODUCTION In recent years, the production technology of high frequency straight seam welded steel pipe has been developing rapidly. It is proceeding to large-scale, thick (thin) walling, high-level, high-speed and automation development and has achieved gratifying results. Now Japan has produced Φ660.4mm (26 inches) large diameter high frequency welded steel pipe (hereinafter referred to as welded steel pipe). The quality of welded steel pipe has been from low-alloy carbon steel