Alloy steel seamless steel tube for geological drilling and machining method thereof
A technology of seamless steel pipe and geological drilling, applied in the field of seamless steel pipe, can solve the problems of separation layer and surface decarburization, poor impact toughness, poor dimensional accuracy of hot-rolled steel pipe, etc., and achieve high rotational deformation resistance and wear resistance, The effect of good low temperature impact toughness and sufficient safety margin
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[0024] Specific embodiments of the present invention will be described below.
[0025] The chemical composition of the alloy steel seamless steel pipe for geological drilling according to the present invention is as follows by weight percentage: C: 0.25~0.30, Si: 0.17~0.35, Mn: 0.85~1.00, P≤0.012, S≤0.008, Cr: 0.90~ 1.10, Mo: 0.40~0.50, Ni, Cu≤0.1, Alt: 0.015~0.030. Sn, Pb, As, Sb≤0.01, the balance is Fe.
[0026] A method for processing an alloy steel seamless steel pipe for geological drilling, comprising the following steps:
[0027] The first step: using a conventional process to refine the tube blank of the composition described in claim 1;
[0028] Step 2: Segment the above-mentioned tube billets after cooling and place them in a heating furnace for heating. The temperature of the heating furnace is 1240°C to 1280°C;
[0029] Step 3: Hot rolling the tube billet described in step 2 into a seamless steel tube, the hot rolling temperature is 1200°C-1230°C;
[0030] Step...
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