Method of manufacture directly during the pouring of the ingots drilled for the manufacture of pipes without welding

• 1. 用于铅液浇铸的焊接铅模及制造工艺和浇铸工艺 [P] . 中国专利： CN109108216A . 2019-01-01
• 2. 一种生产圆钢锭的浇铸模及浇铸方法 [P] . 中国专利： CN101524745A . 2009-09-09
• 3. DEVICE FOR SHIELDING PIPE STOCK WELDED PART OF ELECTRIC RESISTANCE WELDED STEEL PIPE, METHOD OF SHIELDING PIPE STOCK WELDED PART, ELECTRIC RESISTANCE WELDED STEEL PIPE MANUFACTURING METHOD USING THE SHIELDING METHOD, AND ELECTRIC RESISTANCE WELDED STEEL PIPE MANUFACTURED BY THE STEEL PIPE MANUFACTURING METHOD [P] . 日本专利： JP2015120195A . 2015-07-02

  机译： 电阻焊钢管的焊管焊接零件的制造方法，焊管焊材的焊接方法，使用焊焊法的电阻焊钢管的制造方法，以及用焊锡管制造的电阻焊钢管的制造方法

• 4. To manufacture of the ingots round for steel pipes without welding. [P] . 法国专利： FR2667524B1 . 1994-10-28

  机译： 制造用于钢管的铸锭，无需焊接。

• 5. To manufacture of the ingots round for steel pipes without welding. [P] . 法国专利： FR2667524A1 . 1992-04-10

  机译： 制造用于钢管的铸锭，无需焊接。

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