Wear-resistant seamless steel pipe for transportation and production method thereof

Abstract

The invention provides a wear-resistant seamless steel pipe for transportation and a production method thereof. The production method comprises the following steps: the chemical composition of the tube blank obtained by smelting is: C: 0.28-0.36%, Si: 0.70-1.30%, Mn : 2.80~3.20%, V: 0.05~0.15%, Nb: 0.02~0.04%, Cr: 0.40~0.80%, Mo: 0.14~0.26%, B: 0.0005~0.0035%, As: 0~0.015%, Sn: 0~0.010%, P: 0~0.015%, S: 0~0.010%, and the balance of Fe, etc.; the heating temperature of the tube blank before rolling is 1220~1260℃, and the final rolling temperature is 860℃ ~900°C; the heat treatment of seamless steel pipes includes quenching and tempering, the quenching heating temperature is 890~950°C, the quenching method is external spraying and internal axial flow, and the tempering heating temperature is 380~460°C. The seamless steel pipe produced by the present invention has a composite structure of tempered troostite and fine carbides dispersed and precipitated after undergoing large deformation pressure processing and heat treatment, and has good wear resistance and low temperature impact performance at the same time .

Description

technical field [0001] The invention belongs to the technical field of producing seamless steel pipes in the metallurgical industry, and specifically relates to a wear-resistant seamless steel pipe for transportation and a production method thereof. Background technique [0002] In metallurgy, mining, building materials, and electric power industries, the annual consumption of wear-resistant pipelines for transporting ferroalloys, coal, ores, rocks, and slurry discharges is huge. [0003] The above-mentioned wear-resistant pipelines are often used in low-temperature operating environments, and the impact force is relatively large during the transportation process, which is prone to early failure. Therefore, its working environment requires that the wear-resistant pipeline should have good wear resistance and low temperature toughness at the same time. [0004] At present, the most widely used and consumed wear-resistant pipes are still mainly wear-resistant cast iron, wear-...

AI Technical Summary

Problems solved by technology

[0004] At present, the most widely used and consumed wear-resistant pipes are still mainly wear-resistant cast iron, wear-resistant cast steel pipes and composite pipes, but their manufacturing process is complicated, the cost is high, and the combination of strength and toughness is not ideal.

Tempered troostite steel has high strength and toughness, and can be used in the field of wear-resistant steel pipes to solve the problem of low-temperature toughness existing in wear-resistant pipes

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