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Method for preparing austenitic-bainitic high- strength alloy gray iron

A technology of high-strength alloy and austenite is applied in the field of preparation of austenitic alloy gray iron, which can solve the problems of low strength, low hardness and poor toughness of gray iron, reduce the fluidity of molten iron and achieve stable performance. , the effect of dense tissue

Inactive Publication Date: 2013-01-09
齐齐哈尔市精铸良铸造有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problems of the existing gray iron with low strength and hardness and poor toughness, and provides a preparation method of austeric high-strength alloy gray iron

Method used

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  • Method for preparing austenitic-bainitic high- strength alloy gray iron

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specific Embodiment approach 1

[0014] Specific embodiment one: the preparation method of a kind of austeric high-strength alloy gray iron of this embodiment is carried out according to the following steps:

[0015] 1. According to the mass parts of Q10 pig iron, ductile iron return charge and steel scrap, respectively 60~70, 10~20 and 10~20, weigh Q10 pig iron, ductile iron return charge and scrap steel, and then weigh the ferromolybdenum mass and Q10 pig iron , The ratio of the total mass of ductile iron recycled materials to scrap steel is (1.5~1.8): 100, and the ratio of the total mass of electrolytic copper to Q10 pig iron, ductile iron recycled materials and scrap steel is (2~2.2): 100, according to The ratio of the mass of silicon-barium inoculant to the total mass of Q10 pig iron, nodular iron return charge and steel scrap is (0.9~1.1): 100, according to CaO-Al 2 o 3 The ratio of the quality of the base molten steel purifying agent to the total mass of Q10 pig iron, ductile iron return materials and...

specific Embodiment approach 2

[0020] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the components contained in the steel scrap in step 1 and the mass fractions of each component are: C: 0.15%~0.25%, S: 0.012%~0.016%, P: 0.014%~0.034%, Mn: 0.10%~0.30%, Si: 0.20%~0.40%, other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the mass fractions of Q10 pig iron, nodular iron return charge and steel scrap in step one are 60, 20 and 20 respectively, other steps and parameters and specific implementation Method 1 or 2 are the same.

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Abstract

The invention discloses a method for preparing austenitic-bainitic high-strength alloy gray iron and aims to solve technical problems that prior gray iron is not high in strength and hardness and low in toughness. The preparation method includes adding Q10 pig iron, ductile iron foundry returns and steel scrap to a intermediate frequency furnace, heating the mixture to a molten state, adding ferromolybdenum and electrolytic copper to obtain molten iron, performing inoculation by adding inoculants, adding a purifier and deslagging agents and finally using a method of isothermal salt bath to perform heat treatment to obtain the austenitic-bainitic and high- strength alloy gray iron. According to the method, the obtained austenitic-bainitic and high- strength alloy gray iron is compact in structure and stable in performance, the tensile strength is 600 MPa to 650 MPa after isothermal quenching, the Brinell Hardness is 345HBW to 369HBW, the strength and the hardness are large, the elongation rate is 4% to 5%, the toughness is good, and the method can be widely applied in fields of machinery, machine tools, metallurgy, automobiles and the like.

Description

technical field [0001] The invention relates to a preparation method of Aubinite gray iron. Background technique [0002] Due to the unique performance characteristics of gray cast iron, it occupies a very important position in the application of machinery, machine tools, metallurgy, automobile and other industries. Over the past 30 years of reform and opening up, my country's gray cast iron production technology level has been greatly improved. But compared with foreign advanced countries, there is still a big gap. With the improvement of casting quality requirements in machinery, metallurgy, textile and other industries, the demand for high-strength gray cast iron has increased sharply. In the past 10 to 20 years, a large amount of information has been accumulated in the research of Aubic ductile iron at home and abroad. Has begun to enter the application phase. But the research on Aubey gray iron is still less at home and abroad. Compared with gray cast iron with pear...

Claims

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Application Information

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IPC IPC(8): C21C1/08C22C33/08C21D5/00
CPCY02P10/20
Inventor 鲍玉龙王彬
Owner 齐齐哈尔市精铸良铸造有限责任公司
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