X70-grade abrasion-resistant pipeline steel plate for delivery pipeline and manufacture method thereof

Abstract

The invention discloses an X70-grade abrasion-resistant pipeline steel plate and a manufacture method thereof, and relates to the field of steel materials. The steel plate is prepared from the following chemical ingredients in percentage by mass: 0.060-0.090 percent of C, 1.30-1.70 percent of Mn, 0.15-0.25 percent of Cr, 0.10-0.35 percent of Si, 0.035-0.070 percent of Nb, 0.010-0.020 percent of Ti, 0.10-0.30 percent of Ni, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S and the balance of Fe and inevitable impurities. According to the steel plate, during component designing, the final performance of an abrasion-resistant pipeline steel plate is ensured to meet the requirement for pipeline manufacture, the steel hardness is considered to be improved to reinforce the abrasion resistance on that basis, and the X70-grade abrasion-resistant pipeline steel plate has better abrasion resistance than that of a conventional pipeline steel during slurry erodingand abrading due to component system optimization and microscopic organization with coordinated hardness proportion.

Description

technical field [0001] The invention relates to the technical field of iron and steel materials, in particular to an X70-grade wear-resistant pipeline steel plate for conveying pipelines and a manufacturing method thereof. Background technique [0002] Pipeline transportation has played an important role in gas and liquid transportation projects such as oil and natural gas because of its large transportation volume, strong adaptability, low operating cost, and excellent environmental benefits. Slurry transportation of solid materials such as coal and mineral materials can make full use of the advantages of pipeline transportation to alleviate the difficulty of material transportation. The long-distance and large-volume pipeline transportation of materials in industries such as coal, electric power, metallurgy, petroleum, chemical industry, and building materials requires a large amount of pipeline steel. Since coal powder, mineral concentrate powder, tailings, cement, ash a...

AI Technical Summary

Problems solved by technology

X series pipeline steel is commonly used for pipelines. This series of pipeline steel can achieve good strength and toughness and excellent welding performance, but it cannot meet the requirements of pipeline transportation slurry in terms of wear resistance

At present, the existing slurry pipelines at home and abroad are still constructed with conventional pipeline steel, but they still use the traditional polygonal ferrite + pearlite structure. Although the strength level meets the requirements of domestic coal transportation pipeline projects, it is not excellent in wear resistance.

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