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  • Non-destructive testing of LSAW steel pipe

    Non-destructive testing of LSAW steel pipe

    1.Basic requirements for the appearance of LSAW welds Before the non-destructive testing of LSAW steel pipes, the inspection of the weld appearance shall meet the requirements. The general requirements for the appearance of LSAW welds and the surface quality of welded joints are as follows: the a...
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  • The difference between cold forging and hot forging flange

    The difference between cold forging and hot forging flange

    The forging process of flange can be divided into hot forging and cold forging. The differences are as follows:   In the hot forging of flange, the large flange with complex shape can be forged due to the small deformation energy and deformation resistance. In order to obtain the flange with...
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  • Japan’s seamless steel pipe output drops in May on decreased car output & fewer operation days

    Japan’s seamless steel pipe output drops in May on decreased car output & fewer operation days

    According to statistics, Japan produced a total of around 13,000 tons of seamless steel pipes in May this year, dropping by 10.4% compared to the same month a year ago. The output in the first five months amounted to approximately 75,600 tons, a year-on-year decrease of 8.8%. The output of seamle...
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  • Difference between ERW and SAW steel pipe

    Difference between ERW and SAW steel pipe

    ERW is a electric-resistance welded steel pipe, Resistance welded steel pipe is divided into exchange of welded steel pipe and DC welded steel pipe in two forms. AC welding in accordance with different frequencies are divided into low-frequency welding, IF welding, welding of ultra-IF and high-fr...
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  • ERW carbon steel pipe vs spiral pipe

    ERW carbon steel pipe vs spiral pipe

    ERW carbon steel pipe vs spiral pipe: First, the difference between the production process ERW carbon steel pipe is the hot rolled coil through the continuous roll forming, the use of high-frequency current skin effect and proximity effects, so that the edge of the coil heat fusion, pressure in t...
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  • Production process of spiral steel pipe

    Production process of spiral steel pipe

    Spiral steel pipe is a strip coil as raw material, often warm extrusion molding, automatic double wire-sided submerged arc welding process welded spiral seam steel pipe main production processes are as follows: Production process of spiral steel pipe 1. unwinding board probe: After entering the...
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