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

A technology of low temperature resistance and steel casting, applied in the field of steel casting, to achieve the effect of superior comprehensive mechanical properties, excellent welding performance and good toughness

Inactive Publication Date: 2018-05-22
QINGDAO SANHESHAN CASTING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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-t...

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment

[0032] The chemical composition of table 1 embodiment 1-4 cast steel material

[0033]

[0034] After the casting is poured, it is cooled to below 540°C at a speed that does not damage its quality. Before heat treatment, the castings are fully cleaned, no molding material is attached to the surface, and the sand core in the inner cavity is cleaned.

[0035] The heat treatment furnace temperature is measured and controlled by thermocouples and devices with automatic control functions, and can automatically record time-temperature curves. Each curve should record the date and furnace number for identification.

[0036] The specific heat treatment steps are: put the casting in a normalizing furnace, raise the temperature to 910°C±10°C, keep it warm for 3.5-4.5h, take the casting out of the furnace, and cool it in air until the temperature is lower than 370°C. Put the casting in the quenching furnace, raise the temperature to 910°C±10°C, keep the temperature according to the t...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C21D6/00C21D1/28C21D1/18
CPCC22C38/02C21D1/18C21D1/28C21D6/004C21D6/005C21D6/008C22C38/04C22C38/06C22C38/42C22C38/44
Inventor 李明波李春林韩庆利穆建平
Owner QINGDAO SANHESHAN CASTING GROUP
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