A kind of high-hardness high-boron wear-resistant cast steel and its preparation method

Abstract

The invention provides a high-hardness high-boron wear-proof cast steel and a manufacturing method of high-hardness high-boron wear-proof cast steel. According-the technical scheme, the high-hardnesshigh-boron wear-proof cast steel comprises the chemical ingredients of 1.5-3.0 wt% of B, 0.2-0.8 wt% of C, 0.5-0.8 wt% of Al, 0.7-1.0 wt% of Si, 4.0-7.0 wt% of Mn, 0.3-0.5 wt% of Ti, 0.4-0.6 wt% of Ce; 0.4-0. 6 wt% of Mg, smaller than 0.03 wt% of S, smaller than 0.04 wt% of P and the balance Fe and inevitable impurities. The manufacturing method comprises the steps that firstly, scrap steel, pig iron, ferro-boron, ferro-silicon, ferro-manganese, ferrotitanium, rare earth-magnesium-silicon alloy, rare earth ferrosilicon alloy and carburant are mixed according to the chemical composition, and then ferrotitanium, rare earth-magnesium-silicon alloy and rare earth ferrosilicon alloy are pre-set in the bottom of a ladle; then, molten steel smelted from other ingredients is poured into the ladle,casting is conducted by an iron mold, cooling and tempering treatment are conducted, and high-hardness high-boron wear-proof cast steel is manufactured. According to the high-hardness high-boron wear-proof cast steel and the manufacturing method, a simple process and a low preparation cost are achieved, and the manufactured high-hardness high-boron wear-proof cast steel not only has high hardnessbut also has good toughness and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant cast steel. In particular, it relates to a high-hardness, high-boron wear-resistant cast steel and a preparation method thereof. Background technique [0002] There are three main forms of material failure: fracture, corrosion, and wear. Although wear does not cause catastrophic damage to metal workpieces like the other two forms, the economic losses it causes are quite staggering. About 75-80% of the failed mechanical parts are caused by metal wear, and the failure caused by wear not only affects the performance and durability of the machine equipment, but also consumes a lot of manpower and material resources to replace parts and repair equipment, resulting in huge economic losses. loss. For this reason, various wear-resistant materials have been developed, and high-boron iron-based wear-resistant alloys are one of them. Compared with other steel-based wear-resistant materials, high-b...

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Problems solved by technology

Although these two methods improve the toughness of the alloy to a certain extent while increasing the hardness, due to the addition of precious alloy elements and the use of high-temperature heat treatment, the process flow is increased and the manufacturing cost is increased.

For workpieces applied under low load conditions, these two methods are obviously uneconomical

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