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Large alloy steel casting

A technology of alloy steel and castings, which is applied in the field of large alloy steel castings, can solve the problems of casting surface cracks, low casting yield, large wall thickness difference, etc., and achieve good mechanical properties, good surface quality, and high yield.

Inactive Publication Date: 2016-03-02
常熟市虹桥铸钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Large-scale machine tool castings, with a single piece of more than 40 tons, and large-scale machine tool castings have complex structures and large differences in wall thickness. During the casting process, defects such as casting surface cracks, pores, and sand holes are prone to occur, and the casting yield is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A large alloy steel casting is a large machine tool casting. The large machine tool casting is made of high-strength stainless cast steel through low-pressure casting. The low-pressure casting process includes the following steps:

[0017] a. Melting stainless cast steel solution: put high-strength stainless cast steel into a high-temperature smelting furnace, and smelt it into molten steel at a temperature of 950° C. The ratio is: carbon 0.02%, silicon 1%, manganese 0.8%, phosphorus 0.05%, sulfur 0.02%, chromium 18%, nickel 6%, titanium 0.06%, iron 74.05%;

[0018] b. Preheating the casting mold: Preheat the resin sand casting mold to 150°C, keep it warm for 2 hours, and place an external chiller on the outer wall of the resin sand casting mold, which can accelerate the solidification of the casting wall thickness intersection and avoid the occurrence of Cracks, improving the metallographic structure and mechanical properties of the casting part;

[0019] c. Low-press...

Embodiment 2

[0022] A large alloy steel casting is a large machine tool casting. The large machine tool casting is made of high-strength stainless cast steel through low-pressure casting. The low-pressure casting process includes the following steps:

[0023] a. Melting stainless cast steel solution: put high-strength stainless cast steel into a high-temperature smelting furnace, and melt it into molten steel at a temperature of 980° C. The ratio is: carbon 0.04%, silicon 1.5%, manganese 1%, phosphorus 0.02%, sulfur 0.01%, chromium 15%, nickel 3%, titanium 0.03%, iron 79.4%;

[0024] b. Preheating the casting mold: Preheat the resin sand casting mold to 180°C, keep it warm for 2.5 hours, and place an external chiller on the outer wall of the resin sand casting mold, which can accelerate the solidification of the casting wall thickness intersection and avoid the occurrence of Cracks, improving the metallographic structure and mechanical properties of the casting part;

[0025] c. Low-press...

Embodiment 3

[0028] A large alloy steel casting is a large machine tool casting. The large machine tool casting is made of high-strength stainless cast steel through low-pressure casting. The low-pressure casting process includes the following steps:

[0029] a. Melting stainless cast steel solution: put high-strength stainless cast steel into a high-temperature smelting furnace, and melt it into molten steel at a temperature of 1000° C. The ratio is: carbon 0.06%, silicon 0.7%, manganese 0.5%, phosphorus 0.03%, sulfur 0.01%, chromium 16%, nickel 4%, titanium 0.04%, iron 78.66%;

[0030] b. Preheating the casting mold: Preheat the resin sand casting mold to 200°C, keep it warm for 3 hours, and place an external chiller on the outer wall of the resin sand casting mold, which can accelerate the solidification of the casting wall thickness intersection and avoid the occurrence of Cracks, improving the metallographic structure and mechanical properties of the casting part;

[0031] c. Low-pre...

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Abstract

The invention discloses a large alloy steel casting being a large machine tool casting; the large machine tool casting is prepared by performing low-pressure casting for high-strength stainless casting steel; and the low-pressure casting process comprises the steps of: (a) smelting of stainless casting steel solution: the high-strength stainless casting steel is put in a high-temperature smelting furnace for smelting molten steel, and comprises the following components in percentage by mass: 0.02-0.06% of carbon, 0.7-1.5% of silicon, 0.5-1% of manganese, 0.02-0.05% of phosphorus, 0.01-0.02% of sulfur, 15-18% of chronium, 3-6% of nickel, 0.03-0.06% of titanium and the balance of iron; (b) preheating and casting of a mold; (c) low-pressure molding by casting; and (d) pressure relief demolding. Through the mode, the casting is excellent in surface quality, high in yield and excellent in mechanical performance.

Description

technical field [0001] The invention relates to the technical field of metal casting, in particular to a large alloy steel casting. Background technique [0002] Casting is the process of smelting metal into a liquid that meets certain requirements and pouring it into a mold, cooling and solidifying, and cleaning to obtain a casting with a predetermined shape, size and performance. Casting is one of the basic processes of modern machinery manufacturing industry. China has entered the heyday of bronze castings between 1700 BC and 1000 BC, and the craftsmanship has reached a very high level. The Simuwufang Ding weighing 875 kg from the Shang Dynasty in China, the Zenghou Yizun plate from the Warring States Period, and the light-transmitting mirror from the Western Han Dynasty are all representative products of ancient casting. [0003] Large-scale machine tool castings can reach more than 40 tons per piece, and the large-scale machine tool castings have complex structures an...

Claims

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Application Information

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IPC IPC(8): C22C38/50B22D18/04
Inventor 陈学忠
Owner 常熟市虹桥铸钢有限公司
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