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Quasi-as-cast bainite gray cast iron cylinder jacket and preparation method thereof

A cylinder liner and bainite technology, which is applied in the quasi-cast bainite gray cast iron cylinder liner and its preparation field, can solve the problems of high production cost, high labor intensity, large consumption, etc., and achieve low production cost and wear resistance Good sex, cost-effective effect

Active Publication Date: 2008-02-13
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The isothermal quenching method is a traditional method. Its main disadvantage is that the cylinder liner casting needs to be specially heated to make the structure austenitized, and then quenched into a pre-heated salt bath to achieve isothermal transformation, which requires high energy consumption and labor intensity. pollute the environment
The as-cast alloy method is widely used due to factors such as environmental protection, but at present, high-strength bainite gray cast iron cylinder liners are mainly prepared by adding alloy elements molybdenum and nickel. Generally, the content of molybdenum is 0.6-1.5%, and the content of nickel is 0.8- 1.5%, due to the high price of molybdenum and nickel element materials, the large amount of use, so the production cost is high

Method used

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  • Quasi-as-cast bainite gray cast iron cylinder jacket and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] According to the weight percentage of each component, carbon 2.9%, silicon 2.6%, manganese 1.2%, phosphorus 0.055%, sulfur 0.05%, copper 1.0%, chromium 0.2%, and the balance is Fe to prepare raw materials. The molten iron was smelted with a frequency conversion induction furnace, and 0.6% of the mass of the molten iron was inoculated with a silicon-barium inoculant, and the temperature was controlled to 1530 °C. Control the casting temperature to 890°C, and quickly quench it into FEROQUENCH2000 water-based quenching liquid with a mass concentration of 10% to rapidly cool the casting to 450°C; cool the casting slowly to 360°C for 2 hours, and then air-cool the casting; The quasi-cast bainitic gray cast iron cylinder liner was obtained by holding the temperature at 340 °C for 2 h for tempering treatment, and then naturally cooled. The tensile strength was 480 MPa and the hardness was 310 HB.

Embodiment 2

[0038] Prepare raw materials according to the weight percentage of each component: carbon 3.0%, silicon 2.2%, manganese 1.0%, phosphorus 0.055%, sulfur 0.06%, copper 0.5%, chromium 0.5%, and the balance is Fe. The molten iron was smelted with a frequency conversion induction furnace, and the silicon strontium inoculant with a mass of 0.6% of the molten iron was added to inoculate before the molten iron was released, and the molten iron was controlled to be 1530 °C. Control the casting temperature at 910°C, and quickly quench it into PAG9020 water-based quenching liquid with a mass concentration of 5% to rapidly cool to 500°C; cool the casting slowly for 2 hours to 350°C and then air-cool the casting; then cool the casting at a temperature of 360°C After being kept for 2 hours, tempering was carried out, and then naturally cooled to obtain a quasi-cast bainitic gray cast iron cylinder liner with a tensile strength of 360 MPa and a hardness of 280 HB.

Embodiment 3

[0040] According to the weight percentage of each chemical component, carbon 3.1%, silicon 2.4%, manganese 0.9%, phosphorus 0.07%, sulfur 0.06%, copper 0.75%, chromium 0.3%, and the balance is Fe to prepare raw materials. The molten iron is smelted with a frequency conversion induction furnace, and 0.5% of the mass of the molten iron is added to the inoculant for inoculum, and the temperature is controlled to be 1500 ℃. Control the casting temperature at 900°C, and quickly quench it into a DR-polymer polyethylene glycol type water-based quenching liquid with a mass concentration of 15% to rapidly cool to 480°C; keep the castings warm and slowly cool for 2 hours to 430°C Air cooling; the castings are then tempered at a temperature of 350°C for 2 hours, and then naturally cooled to obtain a quasi-cast bainitic gray cast iron cylinder liner with a tensile strength of 420MPa and a hardness of 295HB.

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Abstract

The invention relates to a quasi-cast bainite gray cast iron cylinder liner and a preparation method thereof. The chemical composition weight percentage of the cylinder liner matrix is ​​as follows: carbon 2.9-3.3%, silicon 2.2-2.6%, manganese 0.7-1.3%, Phosphorus is not more than 0.1%, sulfur is not more than 0.1%, copper is 0.5-1.0%, chromium is 0.2-0.5%, and the balance is Fe. The method is as follows: prepare raw materials according to the weight percentage of each component; smelt the raw materials to obtain high-temperature molten iron, control the temperature of the molten iron to be 1500-1550° C. Cylinder liner castings were prepared by wet paint centrifugal casting process; quasi-cast bainitic cylinder liners were obtained by cooling the cylinder liner castings. The composite matrix of the cylinder liner of the invention has good wear resistance; the mechanical properties including tensile strength and hardness are equivalent to those of the existing cylinder liner, but the production cost is reduced and the cost performance is high.

Description

(1) Technical field [0001] The invention relates to a quasi-cast bainitic gray cast iron cylinder liner and a preparation method thereof. (2) Background technology [0002] At present, high-strength bainitic gray cast iron cylinder liners are mainly prepared by austempering and as-cast alloying. The isothermal quenching method is a traditional method, and its main disadvantage is that the cylinder liner casting needs to be specially heated to austenitize the structure, and then quenched into a pre-heated salt bath to achieve isothermal transformation, which has high energy consumption, high labor intensity, and high energy consumption. cause pollution to the environment. The as-cast alloy method is widely used due to environmental protection and other factors, but at present, high-strength bainitic gray cast iron cylinder liners are mainly prepared by adding alloying elements molybdenum and nickel. Generally, the molybdenum content is 0.6-1.5%, and the nickel content is 0.8...

Claims

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Application Information

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IPC IPC(8): C22C37/00C21C7/04
Inventor 缪达钧殷建祥刘治军秦小才王小军
Owner ZYNP GRP
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