High-strength high-tenacity alloy cast steel material used for draw gears of railway vehicles

Abstract

The invention discloses a high-strength high-tenacity alloy cast steel material used for draw gears of railway vehicles. The alloy caste steel material is composed of, by weight, 0.14-0.20 part of C, 0.20-0.40 part of Si, 0.90-1.20 parts of Mn, 1.00-1.20 parts of Cr, 0.60-0.90 part of Ni, 0.20-0.40 parts of Mo, 0-0.030 part of S, 0-0.030 part of P and the balance Fe and inevitable impurities. According to the alloy caste steel material, the yield strength is equal to or larger than 800 MPa, the tensile strength is equal to or larger than 920 MPa, the elongation is equal to or larger than 14%, the percentage reduction of area is equal to or larger than 40%, and the ballistic work at the temperature of-40 DEG C is equal to or larger than 35 J.

Description

technical field [0001] The invention relates to alloy cast steel, in particular to a high-strength, high-toughness alloy cast steel material used for railway vehicle couplers (including couplers and knuckles). Background technique [0002] The coupler is the main load-bearing part of the railway vehicle. It realizes the connection between the locomotive and the vehicle or between the vehicle and the vehicle and transmits the traction and impact force. The material selection of the coupler has an important impact on its safety. At present, my country's coupler materials are mainly equivalent to the E-grade steel of the AARM-201 standard specification, and even higher-strength improved E-grade steel materials. The chemical composition requirements are shown in Table 1: [0003] Table 1 [0004] [0005] The mechanical performance requirements are as follows: [0006] Table 2 [0007] [0008] However, with the development of heavy-duty railway transportation, the trai...

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Problems solved by technology

[0008] However, with the development of heavy-duty railway transportation, the train formation is getting larger and larger, and the tensile and compressive loads on the couplers during operation are increasing. Although the use of improved materials meets the strength requirements, the couplers continue to appear. Cracks, Fractures

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