High-strength corrosion-resistant sucker rod steel and production method thereof

Abstract

The invention discloses high-strength corrosion-resistant sucker rod steel and a production method thereof. The high-strength corrosion-resistant sucker rod steel comprises the following chemical components in percent by mass: 0.15-0.25% of Si, 1.8-2.5% of Mn, 2.0-2.4% of Ni, 11.00-11.50% of Cr, 0.40-0.60% of Mo, 0.20-0.35% of Cu, 0.010-0.025% of Al, 0.10-5 (C-0.02)% of Ti, smaller than or equal to 0.055% of C, smaller than or equal to 0.025% of P, smaller than or equal to 0.010% of S, 0.015-0.025% of N and the balance of Fe and unavoidable impurities. The high-strength corrosion-resistant sucker rod steel has the benefits as follows: through optimization design of the chemical components, the sucker rod steel with high strength and corrosion resistance is developed, so that a domestic gap in the field is filled; a requirement of oil exploitation in a corrosive oil field environment on a corrosion-resistant sucker rod is met; the sucker rod steel has significant effects of ensuring safe and stable production of an oil field, improving the production efficiency and reducing the exploiting cost and has an important significance in the long-term development of the oil exploitation industry.

Description

technical field [0001] The invention relates to an alloy structural steel in the iron and steel industry, in particular to a high-strength, corrosion-resistant sucker rod steel and a production method thereof, belonging to the technical field of oil field steel. Background technique [0002] With the increasing complexity of the oil mining industry and mining environment, H in a large number of oil fields 2 S, Cl - The content is increasing year by year, and mining tools have been working in a corrosive environment for a long time. Due to oil corrosion, sucker rod fracture accidents occur frequently, causing large economic losses to the oil field and greatly increasing the cost of oil production. [0003] Ordinary sucker rods are mainly made of 20-42CrMo series steel, which can no longer meet the mining tasks in such corrosive industrial and mining oil fields. Contents of the invention [0004] In order to solve the deficiencies of the prior art, the purpose of the prese...

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Problems solved by technology

[0002] With the increasing complexity of the oil mining industry and mining environment, H in a large number of oil fields 2 S, Cl - The content is increasing year by year, and the mining tools work in a corrosive environment for a long time. Due to the oil corrosion, the sucker rod breakage accidents occur frequently, causing large economic losses to the oil field and greatly increasing the cost of oil production.

[0003] Ordinary sucker rods are mainly made of 20-42CrMo series steel, which can no longer meet the mining tasks in such corrosive industrial and mining oil fields.

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