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端部加厚(镦粗)的钻探管和套管在车丝前要进行淬火、回火处理。由于钢管全长的壁厚不同,所以对热处理的加热装置及工艺有一定的要求。
Thickened (upset) drill pipe and casing at the end are quenched and tempered before the wire. Due to the different length of the steel pipe wall, so the heat treatment of heating devices and processes have certain requirements.