A kind of wear-resistant steel for slurry conveying welded pipe pipeline and its manufacturing method

Abstract

The invention relates to wear-resistant steel for an ore slurry delivering welded pipe line and a manufacturing method thereof. The wear-resistant steel comprises the following components in percentage by weight: 0.04-0.10% of C, 1.00-1.70% of Mn, 0.20-0.60% of Cr, no more than 0.025% of Ti, no more than 0.06% of Nb, 0.02-0.06% of V, 0.10-0.40% of Si, no more than 0.05% of Al, no more than 0.008% of N, no more than 0.015% of P, no more than 0.008% of S and the balance of Fe and inevitable impurities; Pcm is no more than 0.18%, the steel plate is in a multiphase complex tissue of acicular ferrite+bainite+MA, and micro VC second-phase high-hardness particles are dispersed and precipitated in the tissue; and the transverse yield strength Rt0.5 of the steel plate is 490-705 MPa, the transverse tensile strength Rm is 570-825 MPa, and the yield ratio is Rt0.5 / Rm(0.85, hardening index n)1.10. According to the invention, the steel plate is simple in chemical composition and low in production cost, and the low carbon equivalent is beneficial to weldability; and due to the low yield ratio, the steel plate has the characteristics of easy pipe forming, high hardening index, high wear resistance and the like, and the wear resistance is almost doubled in comparison with a common line pipe.

Description

technical field [0001] The invention relates to a wear-resistant steel, in particular to a wear-resistant steel for a welded pipe for ore slurry transportation and a manufacturing method thereof, which is suitable for the transportation of ore slurry or silt slurry such as coal mines and petrochemical ores. Background technique [0002] Traditional coal mines and other petrochemical ore raw materials are transported by road by vehicles, etc., which need to occupy land and destroy ecology to build roads, and consume a lot of petroleum energy, and fine dust will also cause pollution along the way. At present, there is a new industrial technology that crushes ore raw materials and mixes them with water to form a slurry and transports them through pipelines, just like oil transportation, which can avoid problems such as land occupation, environmental pollution, and ecological damage caused by ore transportation. However, the ore slurry is different from petroleum. The ore partic...

AI Technical Summary

Problems solved by technology

Such a high carbon content not only makes the steel plate very strong, making it difficult to form and weld pipes, but also obviously cannot meet the welding requirements for on-site construction of pipeline projects, and cannot be used for the construction of slurry pipelines

Images