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    Wu Zhicheng. IMPROVEMENT OF THE PRODUCTION PROCESS OF 40Cr STEEL PIPE FOR DRILL ROD CASING[J]. STEEL PIPE, 1991, 20(3): 21-23.
    Citation: Wu Zhicheng. IMPROVEMENT OF THE PRODUCTION PROCESS OF 40Cr STEEL PIPE FOR DRILL ROD CASING[J]. STEEL PIPE, 1991, 20(3): 21-23.
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    IMPROVEMENT OF THE PRODUCTION PROCESS OF 40Cr STEEL PIPE FOR DRILL ROD CASING

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    • The piercing-reducing process of 40Cr steer pipes for drill rod casing has such advantages as lower cost, higher quality and higher yield as compared with the original process having Piercing without reducing.
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