Low temperature resisting cast steel material and thermal treatment process of casting made from low temperature resisting cast steel material

Abstract

The invention relates to a low temperature resisting cast steel material. The low temperature resisting cast steel material comprises the following chemical ingredients in mass fraction: 0.17% to 0.29% of C, 0.30% to 0.50% of Si, 0.60% to 1.80% of Mn, smaller than or equal to 0.020% of S, smaller than or equal to 0.020% of P, smaller than or equal to 0.10% of Cu, smaller than or equal to 1.20% ofCr, smaller than or equal to 0.30% of Ni, smaller than or equal to 0.30% of Mo, smaller than or equal to 0.080% of AI and the balance of Fe and inevitable impurities. The cast steel material providedby the invention can maintain good strength and toughness for a long time under the condition that the temperature is -60 DEG C, the invention also provides a thermal treatment process of a casting matched with the designed cast steel, and a finished product which is good in toughness, excellent in welding performance and remarkable in other comprehensive mechanical properties can be obtained.

Description

technical field [0001] The invention belongs to the technical field of cast steel, and in particular relates to a heat treatment process for a low-temperature resistant cast steel material and its castings. Background technique [0002] With the continuous growth of the national economy, my country's railway transportation industry and related industries have achieved considerable development. While meeting domestic demand, some products and related parts have entered the international market. In recent years, the export volume of railway wagons and related parts has continued to increase. Due to the high latitude of Russia and the extremely low temperature and long time in winter, cast steel products for rail transit must withstand the impact load of low temperature and heavy load for a long time. At present, the low temperature requirements of domestic and international cast steel materials are limited to -40°C; the low temperature standard of cast steel materials in Russi...

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Problems solved by technology

[0003] Aiming at the above-mentioned problems that the existing cast steel materials cannot be used under the temperature condition of -60°C, the present invention provides a low-temperature resistant cast steel material, and also provides a heat treatment process for castings, which can maintain a good temperature at -60°C for a long time. strength and toughness

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