Ultrahigh-strength and high-toughness steel for pumping rod and production process thereof
An ultra-high-strength, production-process technology, applied in the field of alloy structural steel, can solve problems such as strength reduction, broken rod accidents, and excessive performance differences, and achieve the effects of reducing the number of fractures, increasing fatigue life, and improving cleanliness
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[0031] The comparison of the chemical composition of the ultra-high-strength sucker rod steel 42CrMoA, patented steel (patent publication number CN101962737A) used in China and the present invention is shown in Table 1 below.
[0032] Table 1 Comparison of chemical composition wt%
[0033]
[0034] Prepared using the following production process:
[0035] (1) LD converter smelting: smelting in a top-bottom combined blowing converter of more than 90 tons, using molten iron and scrap steel as raw materials for preliminary smelting to achieve pre-de-P removal, adding special synthetic refining slag, composite deoxidizer and high purity to the steel The alloy is pre-deoxidized and the composition is adjusted initially, and slag retention is used to prevent the return of P when tapping;
[0036] (2) LF refining: deep deoxidation and alloying of molten steel in a LF furnace of more than 90 tons to produce high-basicity slag (R≥3.0) to strengthen the removal of S and inclusions. The refi...
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