A niobium-titanium-chromium-boron alloy wear-resistant steel and preparation method thereof

Abstract

The invention discloses a niobium-titanium-chromium-boron alloyed wear-resistant steel. The niobium-titanium-chromium-boron alloyed wear-resistant steel comprises, by weight, 0.15-0.30% of C, 0.40% orless of Si, 0.60-1.60% of Mn, 0.015% or less of P, 0.0015% of S, 0.010-0.050% of Nb, 0.0025-0.40% of Cr, 0.010-0.040% of Ti, 0.015-0.040% of Als, 0.0025-0.040% of Ni, 0.0010-0.0040% of Cu, 0.0010-0.0050% of Ca, 0.0010-0.0030% of B, 0.006% or less of N, 0.004% or less of O, 0.00020% or less of H, and the balance of iron and inevitable impurities. A preparation method of the niobium-titanium-chromium-boron alloyed wear-resistant steel comprises the following steps: hot metal pretreatment, converter smelting, alloy fine adjustment, LF refining, RH refining, continuous casting, stacking slow cooling, hot rolling, cross cutting and flattening, and heat treatment for obtaining the finished product. The niobium-titanium-chromium-boron alloyed wear-resistant steel is a martensite structure, and has excellent mechanical properties and excellent wear resistance, the Rm value is 1250-1500 MPa, the A50 value is 7-15%, the HBW value is 425-500, the thickness size tolerance is within -0.15 to +0.15mm, and the lowest thickness of a wear-resistant plate produced from the steel can be 2.0 mm.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a niobium-titanium-chromium-boron alloy wear-resistant steel and a preparation method thereof. Background technique [0002] Low-alloy high-strength wear-resistant steel has good machinability and excellent wear resistance. The service life is several times that of traditional structural steel plates. The production process is simple. Generally, it is quenched after being rolled by a stove coil mill or a wide and thick plate mill+ Temper. It is mainly alloyed with Cr and Mo, and the production cost is relatively high. The main thickness is 6-150mm. The wear-resistant steel produced by this type of process has obvious disadvantages. Due to the use of sheet rolling or steckel rolling mill, the thickness accuracy is not high, and the yield is low, especially the wear-resistant steel with a thickness below 6mm cannot be produced, and the thickness accuracy is relati...

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Problems solved by technology

The wear-resistant steel produced by this type of process has obvious disadvantages. Due to the use of sheet rolling or steckel rolling mill, the thickness accuracy is not high, and the yield is low, especially the wear-resistant steel with a thickness below 6mm cannot be produced, and the thickness accuracy is relatively low. Difference (-0.3~+0.3mm)

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