Round steel with high strength and toughness and hydrogen sulfide stress corrosion resistance for drilling tool and manufacturing method of round steel

Abstract

The invention discloses a round steel with high strength and toughness and hydrogen sulfide stress corrosion resistance for a drilling tool and a manufacturing method of the round steel. The round steel comprises the following chemical components in percentage by mass: 0.20-0.30% of C, 0.15-0.40% of Si, 0.20-0.70% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.70-1.30% of Cr, 0.40-0.95% of Mo, less than or equal to 0.25% of Ni, 0.05-0.10% of Cu, 0.05-0.10% of Alt, less than or equal to 0.1% of V, less than or equal to 0.06% of Nb, less than or equal to 0.010% of Ti, less than or equal to 0.009% of N, 0.001-0.003% of B and the balance of Fe and inevitable impurities. By adopting the preparation method, the round steel with the maximum specification of 350mm can be manufactured, and the round steel is particularly suitable for being processed to be stress complex drilling tools with large specifications and high strength and toughness requirements such as hydrogen sulfide corrosion resistant drill rods, drill collars, and drill rod joints applied to acidic oil wells.

Description

technical field [0001] The invention belongs to the field of steel preparation for hydrogen sulfide corrosion-resistant drilling tools, and in particular relates to a round steel for large-scale oil well drilling tools that satisfies both high strength and toughness and hydrogen sulfide corrosion resistance and a manufacturing method thereof. Background technique [0002] In the process of exploitation and development of sour oil and gas fields, corrosion is a serious problem that exists all the time. 2 Under the action of hydrogen generated by S dissociation, brittle fracture will suddenly occur (this phenomenon is called sulfide stress corrosion cracking, SSCC for short), which will cause the scrapping of the oil casing or the entire well, not only causing huge economic losses to the oil field, but also And it often brings some disastrous consequences, such as casualties, shutdown and production shutdown, and environmental pollution. Therefore, there is an increasingly ur...

AI Technical Summary

Problems solved by technology

Limited by steelmaking, heat treatment equipment and technology, these anti-corrosion steels have poor composition design, low steel purity, difficult to control the shape of inclusions, shallow hardened layer depth, poor structure uniformity, and the strength and toughness after heat treatment cannot be achieved at the same time. The problem of high use requirements cannot meet the requirements of the combination of corrosion resistance and high strength and toughness required by oil well drilling tools at the same time

Therefore, most of them cannot be widely used in the production of key drilling tool components such as drill collars, large-size drill pipes, and drill pipe joints, which are subject to complex forces.

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