Steel for single-layer concrete conveying pipe of trailer pump vehicle and production method thereof

Abstract

The invention discloses steel for a single-layer concrete conveying pipe of a trailer pump vehicle and a production method thereof. The steel for the single-layer concrete conveying pipe of the trailer pump vehicle includes 0.38-0.48% of carbon, 0.05-0.35% of silicon, 1.60-2.50% of manganese, 0.0015-0.0030% of calcium, 0.35-0.65% of chromium, 0.30-0.50% of tungsten, 0.05-0.20% of erbium, 0.015-0.045% of aluminum, less than or equal to 0.010% of phosphorus, less than or equal to 0.003% of sulfur, less than or equal to 0.006% of nitrogen, and rest of iron and unavoidable impurity. The steel is high in wear-resisting property, the proper final rolling and coiling temperature is controlled in the production process, the standing time of a steel coil at a two-phase region is reduced, the steel is quickly cooled to a pseudo-eutectoid pearlite precipitation zone, the proeutectoid ferrite production is reduced, the proeutectoid ferrite is not generated in a slow cooling process after coiling, and meanwhile, the bainite formation due to a too low coiling temperature is avoided, and more pearlite is formed.

Description

technical field [0001] The invention relates to a wear-resistant steel, which belongs to the field of low-alloy steel manufacturing, and in particular to a steel for a single-layer concrete delivery pipe of a towed pump truck. Background technique [0002] At present, my country is in the peak period of infrastructure construction, and industries such as real estate, water conservancy facilities, and transportation facilities have a large demand for construction machinery for concrete transportation, such as towed pump trucks. Concrete single-layer conveying pipes for towed pump trucks are a consumable product, and they need to be replaced after the conveyed concrete reaches a certain cubic area, so the demand for them is very large. At present, different construction machinery manufacturers use different concrete conveying pipe materials, such as steel materials, plastic materials, ceramic materials, etc., among which steel materials are the main ones. The index to measure...

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Problems solved by technology

However, the invention patent application is suitable for casting products, which contain high Ni, Mo, V, Cu, Nb and other precious alloy elements, and the cost is high

Similarly, the carbon content of this steel is relatively low, and there are more pro-eutectoid ferrites, resulting in poor pearlite spheroidization rate during annealing, and it is not explained how to avoid excessive pro-eutectoids in the rolling process Ferrite is used to increase the pearlite spheroidization rate during annealing, and the forming and processing performance of the steel plate is relatively poor

Moreover, the N content of the steel is loosely controlled, and the data show that the high N content in the steel is easy to produce nitride precipitation with the microalloying element Nb

When the billet temperature drops below 950°C, a large amount of fine Nb (C, N) precipitates from γ, resulting in a sharp drop in ductility; when the temperature is lower than 900°C, it enters the AlN precipitation temperature zone, and AlN precipitates at the γ grain boundary It will also aggravate the embrittlement of the steel, and edge cracks will appear when the slab is straightened, and the edge will be warped after rolling, which will affect the yield and performance of the steel plate

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