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High-strength high-toughness cast steel material and manufacturing method thereof as well as cast product

A manufacturing method and high toughness technology, applied in the field of steel casting, can solve the problem of difficulty in ensuring strength and toughness, and achieve the effect of high strength and toughness

Active Publication Date: 2014-12-10
山西中煤电气股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the cooling rate is low as described above, there is a problem that it is difficult to secure sufficient strength and toughness in SCW480 or SCW550 or the composition range described in each of the above patent documents

Method used

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  • High-strength high-toughness cast steel material and manufacturing method thereof as well as cast product

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Embodiment

[0072] The present invention is described below by comparing examples of the present invention with comparative examples.

[0073] The ingredients shown in Table 1 were melted in a vacuum induction melting furnace (hereinafter referred to as VIM), and cast into a sand mold having a length of 240 mm, a height of 250 mm, and a width of 90 mm to obtain an ingot. The ingot was cut to have a size of 80 mm in length, 120 mm in height and 30 mm in width, and after holding the cut ingot at 1050° C. for 20 hours, annealing was performed by cooling at a rate of 50° C. / hour. Subsequently, after keeping it at 890° C. for 20 hours, quenching was performed by cooling at a rate of 300° C. / hour. The cooling rate at the time of quenching simulated the cooling rate at the time of performing fan cooling at a point at a depth of 125 mm from the surface of a large cast steel product.

[0074] In addition, after holding at 610°C for 20 hours, tempering was performed by cooling at a rate of 50°C / ho...

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Abstract

The invention relates to a high-strength high-toughness cast steel material and a manufacturing method thereof as well as a cast product. The high-strength high-toughness cast steel material comprises the following ingredients in percentage by mass: 0.25-0.30% of C, 0.20-0.40% of Si, 0.50-1.10% of Mn, 2.20-2.80% of Ni, 0.25-0.60% of Cr, 0.05-0.10% of Al, 0.20-0.50% of Cu and 0.20-0.40% of Mo and the cast steel material further comprises Fe and unavoidable impurities. As the high-strength high-toughness cast steel material comprises specific ingredients, sufficient high strength and toughness can also be obtained even if the large-sized cast steel material is cooled by air or a fan during quenching, and plastic processing and fluid cooling, such as water cooling or oil cooling, are not required to be carried out.

Description

technical field [0001] The invention relates to the technical field of steel casting, in particular to a high-strength and high-toughness cast steel suitable for large-scale cast steel products with large wall thickness and complex shape and capable of welding and a manufacturing method thereof. Background technique [0002] SCW480, SCW550 and the like described in Japanese Industrial Standards are known as weldable cast steel materials having high toughness and high strength. Also, in the past, more steels have been invented. [0003] The steel shown in Japanese Patent Laid-Open No. 2005-82814 is pre-hardened steel used for molds for plastics, and has been subjected to age-hardening heat treatment after heat-working steel containing a predetermined composition. Among the steels shown in Japanese Patent Publication No. 2004-514060, high strength and high toughness are achieved by performing plastic working such as forging and rolling, or in heat treatment such as quenching,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C21D1/18C21D1/26
Inventor 朱忠良
Owner 山西中煤电气股份有限公司