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Low-alloy cast steel and application thereof in heavy lorry axle housing, raw materials and machining process

A technology of low-alloy cast steel and processing technology, applied in the field of low-alloy cast steel materials, can solve the problems of unsatisfactory casting process performance, excessive addition of alloy elements, high cost of raw materials, etc., to achieve industrial application, less addition of alloy elements, The effect of low raw material cost

Active Publication Date: 2011-10-12
山东新达重工机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of many alloying elements in the SCW550 material, a relatively high content of precious elements such as Cr (chromium), Ni (nickel), Mo (molybdenum), and V (vanadium) is added, and the cost of raw materials is high.
[0004] Moreover, the heat treatment process of SCW550 is quenching and tempering treatment, the process is complex, the process requirements are high, and the production cost is high
This material is prone to defects such as cracks, the yield is not high, and the performance of the casting process is not ideal

Method used

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  • Low-alloy cast steel and application thereof in heavy lorry axle housing, raw materials and machining process
  • Low-alloy cast steel and application thereof in heavy lorry axle housing, raw materials and machining process
  • Low-alloy cast steel and application thereof in heavy lorry axle housing, raw materials and machining process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A low-alloy cast steel processing technology suitable for heavy-duty truck axle housings, including casting and heat treatment processes, and the casting process includes the following steps:

[0036] (1) Add 95-98 parts by weight of steel scrap into an alkaline intermediate frequency induction furnace, remove the slag after 80-90% of the charge is melted, add 1-2 parts by weight of pig iron after the charge is dissolved, and then add a deoxidizer 0.05-1 weight part of manganese-ferroalloy and 0.05-1 weight part of silicon-manganese-ferroalloy are used for precipitation deoxidation, and the temperature is raised to 1550-1590°C, and then 0.1-0.5 weight part of baked ferrochrome alloy and 0.1-0.5 weight part of molybdenum-iron alloy are added and 0.05-1 parts by weight of vanadium-iron alloy;

[0037] (2) After the temperature is raised to 1630-1660°C, the steel is tapped, and an aluminum strip is added for deoxidation. The weight of the aluminum strip is 0.15-0.18% of th...

Embodiment 2

[0045] The mass percentages of the following elements in the low alloy cast steel obtained by the process in Example 1 are: C: 0.28%, Si: 0.68%, Mn: 0.98%, Cr: 0.19%, V: 0.23%, Mo : 0.20%, P: 0.026%, S: 0.011%, residual element content ≤ 0.20%, the rest is Fe. After testing, its mechanical properties tensile strength σ b 650MPa, yield strength σ s It is 390MPa, the elongation δ is 19.2%, and the impact absorption energy Akv of the V-shaped notch impact test (-20°C) is 29.37J. It can be seen that the mechanical properties of the material of this embodiment far exceed the requirements of the cast steel axle housing.

[0046] The metallographic structure of this low-alloy cast steel before normalizing treatment is magnified 100 times, see the attached picture of the specification figure 2 , the metallographic structure after normalizing treatment is ferrite and pearlite structure, see the accompanying drawings Figure 5 , where black is pearlite, and white is ferrite (the sa...

Embodiment 3

[0049] The mass percentages of the following elements in the low alloy cast steel obtained by the process in Example 1 are: C: 0.29%, Si: 0.67%, Mn: 0.96%, Cr: 0.20%, V: 0.21%, Mo : 0.21%, P: 0.022%, S: 0.013%, residual element content ≤ 0.20%, the rest is Fe.

[0050] Its mechanical properties are tensile strength σ b 660MPa, yield strength σ s is 400MPa, elongation δ is 18.5%, V-notch impact test (-20°C) impact absorption energy Akv is 25.18J, it can be seen that the mechanical properties of the material in this embodiment far exceed the requirements of the cast steel axle housing.

[0051] Please refer to the attached picture of this low-alloy cast steel metallographic structure before normalizing treatment, magnified 100 times image 3 , the metallographic structure after normalizing treatment is ferrite and pearlite structure, see the accompanying drawings Image 6 , where black is pearlite, and white is ferrite (the same below), which shows that after heat treatment, ...

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Abstract

The invention discloses a low-alloy cast steel suitable for a heavy lorry axle housing. The low-alloy cast steel comprises the following elements in percentage by mass: 0.23 to 0.33 percent of C, 0.50 to 1.00 percent of Si, 0.90 to 1.40 percent of Mn, 0.10 to 0.25 percent of Cr, 0.10 to 0.25 percent of Mo, 0.20 to 0.25 percent of V, less than or equal to 0.04 percent of P, less than or equal to 0.04 percent of S, less than or equal to 0.20 percent of residual elements, and the balance of Fe. Waste steel, pig iron, ferromanganese alloy, silicon ferromanganese alloy, ferrochromium alloy, ferromolybdenum alloy and ferrovanadium alloy are used as raw materials of the low-alloy cast steel; and the machining process of the low-alloy cast steel comprises casting and thermal treatment. The low-alloy cast steel has the advantages of high mechanical property, good low-temperature impact toughness and good casting and machining process properties, and is particularly suitable for producing the lorry axle housing.

Description

technical field [0001] The invention relates to a low-alloy cast steel material, in particular to a low-alloy cast steel suitable for heavy-duty truck axle housings and its raw materials and processing technology. Background technique [0002] The axle housing is an important functional part of a heavy-duty truck, and its quality performance directly affects the carrying capacity and service life of the vehicle. At present, the commonly used materials for truck housings at home and abroad include ductile iron QT500-7, cast steel ZG270-500 and SCW550 in the Japanese JIS G5102 (1991) standard. The yield of ductile iron axle housing is low, the surface is rough, and the service life is short; while the mechanical properties of ZG270-500 are low; with the increasing load of vehicles, QT500-7 and ZG270-500 are no longer suitable for large-tonnage vehicles, especially It is a heavy-duty vehicle with harsh operating conditions and severe overloading, and is prone to breakage. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C33/06
Inventor 曹宗安邵明金邵长夫邵长启单夫玺
Owner 山东新达重工机械有限公司
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