Alloy cast steel, as well as manufacturing method and application thereof

Abstract

The invention provides an alloy cast steel, as well as a manufacturing method and application thereof. The alloy cast steel is prepared from the following components including, by weight, 0.12 percentto 0.21 percent of carbon, 0.15 percent to 0.35 percent of silicon, 1.21 percent to 1.50 percent of manganese, less than or equal to 0.035 percent of phosphorus, less than or equal to 0.035 percent of sulfur, less than or equal to 0.25 percent of chromium, 0.31 percent to 0.56 percent of molybdenum, 0.02 percent to 0.04 percent of aluminum, 0.02 percent to 0.04 percent of niobium, less than or equal to 0.020 percent of nitrogen, and the balance iron and other inevitable elements. The cast steel prepared from the cast steel materials contains the appropriate amount of carbon, manganese, molybdenum and chromium, so that the strength of the cast steel is improved; and meanwhile, by controlling appropriate contents of other elements to achieve cooperation, on the premise that nickel is adopted, the strength of the cast steel is improved, and the low-temperature toughness of the cast steel is improved.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to an alloy cast steel, its production method and application. Background technique [0002] With the continuous growth of the national economy and the continuous expansion of market demand, my country's railway freight cars and related parts are rapidly entering the alpine regions such as Russia. For this reason, the steel castings used for freight cars must have good low-temperature performance. As shown in Table 1, typical AAR M201-2015 Grade D steel and ASTM A487 4B mechanical property requirements. [0003] Table 1 AAR M201-2015 grade D steel and ASTM A487 4B mechanical property requirements [0004] [0005] Generally, people have been looking for suitable cast steel composition to meet the chemical composition range of the above properties, and try to use low welding carbon equivalent and improve low temperature impact toughness. Such as patent CN103436807B, proposed a kind...

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide an alloy cast steel, its production method and application, so as to solve the problem that it is difficult to ensure high strength and high and low temperature toughness in nickel-free cast steel in the prior art

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