HIGH-STEEL-GRADE ANTI-SULFUR DRILL PIPE MATERIAL AND PREPARATION METHOD THEREOF

摘要

The present invention provides a high-steel-grade anti-sulfur drill pipe material and a preparation method thereof. The high-steel-grade anti-sulfur drill pipe material comprises the following components (wt%): 0.15-0.25% of C, 0.20-0.50% of Mn, 0.20-0.30% of Si, 0.50-1.20% of Cr, 0.80-1.5% of Ni, 0.50-1.20% of Mo, 0.01-0.03% of Nb, 0.01-0.03% of V, 0.01-0.03% of Ti, 1.0-3.0% of Al, 0.005-0.01% of La, S with the weight being less than or equal to 0.001%, P with the weight being less than or equal to 0.003%, and the rest being Fe. The preparation method of the high-steel-grade anti-sulfur drill pipe material comprises the following steps: selecting raw materials according to the components; smelting, refining and continuously casting the raw materials to obtain a cast ingot; rolling the cast ingot to obtain a tubular product; and performing heat treatment on the tubular product to obtain the high-steel-grade anti-sulfur drill pipe material. The strength of the high-steel-grade anti-sulfur drill pipe material in the present invention can reach the steel grade range of 105-135 ksi.