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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AI-Extracted 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 differe...

Method used

The present invention discloses a kind of large-scale alloy steel casting, adopts the stainless cast steel solution with good mechanical properties a...

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.

Technology Topic

Low pressure moldingMachine tool +12

Examples

Experimental program(3)

Example Embodiment

[0015] Example 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, and the low pressure casting process includes the following steps:

[0017] a. Smelting the stainless steel casting solution: put the high-strength stainless steel casting into a high-temperature melting furnace, and smelting it into molten steel at a temperature of 950°C. The components of the high-strength stainless steel casting and the quality of each component 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: Preheating the resin sand casting mold to 150°C, keeping the temperature for 2 hours, and placing an external cold iron on the outer wall of the resin sand casting mold can accelerate the solidification of the intersection of the casting wall thickness and avoid the occurrence of Cracks, improve local metallographic structure and mechanical properties of castings;

[0019] c. Low pressure casting molding: control the temperature of molten steel to 500℃, fill the cavity of the resin sand casting mold under the pressure of 0.12MPa, and keep the pressure for 10 minutes;

[0020] d. Pressure relief and demoulding: After the large machine tool castings are solidified and formed, the pressure relief is released.

Example Embodiment

[0021] 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, and the low pressure casting process includes the following steps:

[0023] a. Smelting the stainless steel casting solution: put the high-strength stainless steel casting into a high-temperature melting furnace, and smelting 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: Preheating the resin sand casting mold to 180°C, keeping the temperature for 2.5 hours, and placing an external cold iron on the outer wall of the resin sand casting mold can accelerate the solidification of the intersection of the casting wall thickness and avoid the occurrence of Cracks, improve local metallographic structure and mechanical properties of castings;

[0025] c. Low-pressure casting molding: control the temperature of molten steel to be 540 °C, fill the cavity of the resin sand casting mold under the pressure of 0.16MPa, and maintain the pressure for 12 minutes;

[0026] d. Pressure relief and demoulding: After the large machine tool castings are solidified and formed, the pressure relief is released.

Example Embodiment

[0027] Embodiment three:

[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, and the low pressure casting process includes the following steps:

[0029] a. Melting the stainless steel casting solution: put the high-strength stainless steel casting into a high-temperature melting furnace, and smelting it into molten steel at a temperature of 1000 °C. The components of the high-strength stainless steel casting and the quality of each component 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 the temperature for 3 hours, and place an external cold iron on the outer wall of the resin sand casting mold, which can speed up the solidification of the intersecting parts of the casting wall thickness and avoid the occurrence of Cracks, improve local metallographic structure and mechanical properties of castings;

[0031] c. Low-pressure casting molding: control the temperature of molten steel to be 550℃, fill the cavity of the resin sand casting mold under the pressure of 0.18MPa, and keep the pressure for 15 minutes;

[0032] d. Pressure relief and demoulding: After the large machine tool castings are solidified and formed, the pressure relief is released.

[0033] The invention discloses a large-scale alloy steel casting, which is formed by low-pressure casting of a stainless steel casting solution with good mechanical properties and fluidity. The casting has good surface quality, high yield and good mechanical properties.

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Classification and recommendation of technical efficacy words

Improve yield
good surface quality

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.

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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