Manufacturing method for anti-abrasion seamless steel pipe for concrete pump truck

Abstract

The invention discloses a manufacturing method for an anti-abrasion seamless steel pipe for a concrete pump truck. The manufacturing method includes the following steps of steelmaking, wherein molten iron desulphurization, converter / electric furnace utilization, LF refining furnace utilization, VD vacuum treatment and round blank continuous casting are involved; pipe rolling, wherein a pipe blank is heated in an annular furnace and heated at the temperature of 1150 DEG C-1230 DEG C, and pipe blank rolling is finished through perforating, rolling of a mandrel pipe mill, diameter reducing of a stretch-reducing mill and straightening; stress relieving of the steel pipe, wherein a continuous furnace is used for annealing treatment. The process of VD continuous casting blank forming, hot rolling, stress relieving, flaw detection and follow-up treatment is adopted to stably produce the anti-abrasion seamless steel pipe for the concrete pump truck, the qualified product ratio of the steel pipe is greatly increased, production cost is reduced, the seamless steel pipe is high in hardness and abrasion resistance, and the manufacturing method is simple, high in qualified product ratio and suitable for large-scale production operation.

Description

technical field [0001] The invention relates to the technical field of manufacturing high wear-resistant seamless steel pipes, in particular to a method for manufacturing wear-resistant seamless steel pipes for concrete pump trucks. Background technique [0002] In recent years, concrete delivery pump trucks have been widely used in concrete pouring projects such as industrial and civil facilities, national defense buildings, etc. 65Mn steel is currently widely used to make pumping wear-resistant pipes due to its good wear resistance. For a concrete pump truck, the conical pipe of the delivery pump has a special shape, and it is mainly made of 65Mn seamless steel pipe, which is pushed by cutting and welded with the flange after quenching and tempering treatment. In the process of conveying concrete, on the one hand, it must bear the continuous erosion and wear of concrete mud, and on the other hand, it must bear higher pressure when conveying concrete mud to higher places or...

AI Technical Summary

Problems solved by technology

[0003] The production process of the original 65Mn seamless steel pipe is "rolled slab or continuous casting slab→perforation→cold working". The property is poor, and the yield of finished products produced by cold rolling is low; (2) the billet production is adopted, and a process is added to the billet, resulting in higher production costs

At present, some enterprises adopt the process of "continuous casting → piercing → cold processing" for trial production. However, due to the large fluctuations in the quality of the 65Mn continuous casting round billet, the inner surface of the capillary often has infolding defects after piercing, and the finished material is also low.

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