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Cast steel and method for preparing same

A technology of cast steel and molten steel, applied in the field of cast steel and the preparation of the cast steel, can solve the problems of easy deformation, low strength and elongation of cast steel, unable to meet market requirements, etc., and achieve high elongation and high strength elongation. rate effect

Inactive Publication Date: 2007-08-08
CHINA NATIONAL HEAVY DUTY TRUCK GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the automobile axle housings are stamped axle housings. This kind of axle housing is prone to deformation and oil leakage under the condition of large impact load, which cannot meet the market requirements. Therefore, it is necessary to use a welded axle housing. The existing cast steel It is not suitable to make the axle housing of welded structure, because the strength and elongation of the current cast steel are low

Method used

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Examples

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Effect test

specific Embodiment 1

[0010] This specific embodiment is a kind of cast steel, comprises the chemical composition of following percentage by weight: C: 0.21%, Si: 0.42%, Mn: 1.06%, Ni: 0.49%, Cr: 0.16%, Mo: 0.04%, P= 0.023%, S=0.020%, the balance is iron, and the carbon equivalent is 0.458%.

[0011] The preparation method of the low-alloy cast steel in this specific embodiment is as follows: 1. According to the chemical composition range given, use scrap steel and pig iron batching; 2. Put the prepared materials into the electric arc furnace for smelting, During the process, ferrosilicon, ferromanganese, electrolytic nickel and ferrochrome are added to adjust the chemical composition; 3. The molten steel obtained from smelting is poured into castings; 4. Normalizing treatment. Measured, its mechanical properties are: σ b =576Mpa, σ s =371Mpa, δ=19.8%, Brinell hardness HB=171.

specific Embodiment 2

[0012] This specific embodiment is a kind of cast steel, comprising the chemical composition of following percentage by weight: C: 0.19%, Si: 0.40%, Mn: 1.10%, Ni: 0.48%, Cr: 0.12%, Mo: 0.04%, P= 0.026%, S=0.022%, the balance is iron, and the carbon equivalent is 0.436%.

[0013] The preparation method of the low-alloy cast steel in this specific embodiment is as follows: 1. According to the chemical composition range given, use scrap steel and pig iron batching; 2. Put the prepared materials into the electric arc furnace for smelting, During the process, ferrosilicon, ferromanganese, electrolytic nickel and ferrochrome are added to adjust the chemical composition; 3. The molten steel obtained from smelting is poured into castings; 4. Normalizing treatment. Measured, its mechanical properties are: σ b =573Mpa, σ s =375Mpa, δ=20.4%, Brinell hardness HB=166.

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PUM

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Abstract

The invention discloses a cast steel and making method, which comprises the following parts: 0.18-0.22% C, 0.30-0.60% Si, 0.90-1.25% Mn, 0.48-0.55% Ni, 0.10-0.25% Cr, not more than 0.10% Mo, not more than 0.040% P, not more than 0.040% S and Fe (0.42-0.48% C). The making method comprises the following steps: 1. allocating; 2. fusing; 3. casting; 4. normalizing. The invention possesses high-strength and high-extending rate, which is fit for casting steel case.

Description

(1) Technical field [0001] The invention relates to a cast steel, in particular to a high-strength and high-elongation cast steel and a preparation method of the cast steel. (2) Background technology [0002] In recent years, with the requirements of social development, all kinds of engineering vehicles, especially heavy-duty dump trucks, must adapt to the harsh conditions of large tonnage and poor road conditions. In particular, the requirements for the axle housing are getting higher and higher. At present, the automobile axle housings are stamped axle housings. This kind of axle housing is prone to deformation and oil leakage under the condition of large impact load, which cannot meet the market requirements. Therefore, it is necessary to use a welded axle housing. The existing cast steel It is not suitable to make the axle housing of welded structure, because the strength and elongation of the current cast steel are low. (3) Contents of the invention [0003] The tec...

Claims

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Application Information

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IPC IPC(8): C22C38/40C22C38/44C22C33/04
Inventor 安波代方正
Owner CHINA NATIONAL HEAVY DUTY TRUCK GROUP
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