Wear-resistant seamless steel pipe and manufacturing method thereof

Abstract

The invention discloses a wear-resistant seamless steel pipe. The wear-resistant seamless steel pipe is manufactured from the following chemical components in percentage by mass: 0.10-0.40% of C, 0.15-0.40% of Si, 0.50-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 1.00% of S, less than or equal to 1.50% of Cr, 0.015-0.050% of Al, 0.005-0.050% of Ti, 0.005-0.050% of Nb, lessthan 0.0050% of B, and the balance Fe and impurity elements. According to the wear-resistant seamless steel pipe, the material is single, the production process and the structure are simple, and themanufactured steel pipe has high wear resistance in the inner wall as well as good plasticity, toughness and weldability in the outer wall.

Description

technical field [0001] The invention belongs to the technical field of steel pipes, and in particular relates to a wear-resistant seamless steel pipe and a manufacturing method thereof. Background technique [0002] Wear-resistant pipelines are widely used in the transportation of mine filling materials, mineral concentrate powder and tailings with severe wear and tear. It is also very suitable for coal-fired power plants to convey powder, slag removal, ash, etc., because the conveying medium generally has high hardness, fast flow velocity, and flow Large and other characteristics, and long-term continuous impact, wear, corrosion and other effects on the pipe wall during the transportation process, causing the pipe to fatigue and gradually wear out, so the ideal wear-resistant pipe with high strength, high toughness and high plastic material is An important way to reduce abrasive wear. [0003] At present, there are many kinds of wear-resistant pipes used for the above purp...

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Problems solved by technology

[0003] At present, there are many kinds of wear-resistant pipes used for the above purposes in China. The characteristic of this kind of pipes is that the inner wall is super high hardness (≥40HRC), which is the most important thing to ensure its wear resistance and working life. Indicators mainly include the following: ① cast steel pipes and cast iron pipes, which generally have poor plasticity and weldability; ② welded pipes that use plate coil welding need to be coiled and welded, and the process is long; ③ bimetallic Composite pipes, surfacing composite pipes, ceramic composite pipes and other double-layer composite pipes have both good wear resistance of the inner wall and good toughness and weldability of the outer wall, but the preparation process of these pipes is complicated and the processing cycle is long. The material is thick and heavy, and limited by the processing technology, a single pipe is relatively short, especially when making long-distance pipelines, there are many interfaces, so the overall cost is high

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