Abrasion-resistant seamless steel pipe for conveying and production method of abrasion-resistant seamless steel pipe for conveying

Abstract

The invention provides an abrasion-resistant seamless steel pipe for conveying and a production method of the abrasion-resistant seamless steel pipe for conveying. The production method includes the steps: smelting to obtain a pipe billet chemically composed of 0.28-0.36% of C, 0.70-1.30% of Si, 2.80-3.20% of Mn, 0.05-0.15% of V, 0.02-0.04% of Nb, 0.40-0.80% of Cr, 0.14-0.26% of Mo, 0.0005-0.0035% of B, 0-0.015% of As, 0-0.010% of Sn, 0-0.015% of P, 0-0.010% of S and the rest Fe; rolling the pipe billet, wherein the heating temperature before rolling of the pipe billet is 1220-1260 DEG C, and the finish rolling temperature is 860-900 DEG C; subjecting the seamless steel pipe to heat treatment including quenching and tempering, wherein quenching is performed at the heating temperature of 890-950 DEG C by means of external spraying and internal axial flow, and the tempering heating temperature is 380-460 DEG C. By means of large-deformation pressure processing and heat treatment, the seamless steel pipe produced according to the method obtains a complex structure of tempered troostite and dispersively precipitated fine carbides, and is highly resistant to abrasion and low-temperature impact.

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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