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High-reliability low-alloy steel preparation method

A low-alloy steel, reliable technology, applied in the field of high-reliability low-alloy steel preparation, can solve the problems of poor reproducibility of low-alloy steel products, easy deformation and cracking, poor reliability of the preparation method, etc., and achieve less impurity content , Improving the comprehensive mechanical properties and shortening the ball milling time

Inactive Publication Date: 2018-07-27
宁波吉威熔模铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-alloy steel products currently prepared are prone to deformation and cracking during the preparation process, so the reproducibility of the low-alloy steel products is poor, resulting in poor reliability of the preparation method

Method used

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  • High-reliability low-alloy steel preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of high reliability low-alloy steel preparation method proposed by the present invention comprises the following steps:

[0021] S1, prepare low-alloy steel raw materials: prepare carbon powder, chromium powder, molybdenum powder, manganese powder, nickel powder, cobalt powder, titanium powder and iron powder, and set aside;

[0022] S2. Ball milling of iron powder: put the iron powder in a ball mill, add ball milling aids, and carry out ball milling for 1 hour. During ball milling, the mass ratio of grinding balls to iron powder is 2:1, and the diameter of the grinding balls is 10mm. Steel balls and steel balls with a diameter of 20mm are combined according to the number ratio of 1:1, and refined iron powder can be obtained after ball milling;

[0023] S3. Melting of low alloy steel: 0.85m 3 Feed nitrogen gas into the smelting furnace at a flow rate of / h, and continue for more than 40 minutes, then add the fine iron powder obtained in step S2 into the smelting...

Embodiment 2

[0027] A kind of high reliability low-alloy steel preparation method proposed by the present invention comprises the following steps:

[0028] S1, prepare low-alloy steel raw materials: prepare carbon powder, chromium powder, molybdenum powder, manganese powder, nickel powder, cobalt powder, titanium powder and iron powder, and set aside;

[0029] S2. Ball milling of iron powder: put iron powder in a ball mill, add ball milling aids, and carry out ball milling for 2 hours. During ball milling, the mass ratio of grinding balls to iron powder is 3:1, and the diameter of the grinding balls is 10mm. Steel balls and steel balls with a diameter of 20mm are combined according to the number ratio of 1:1, and refined iron powder can be obtained after ball milling;

[0030] S3. Melting of low alloy steel: 0.65m 3 Feed nitrogen gas into the smelting furnace at a flow rate of / h, and continue for more than 40 minutes, then add the fine iron powder obtained in step S2 into the smelting fu...

Embodiment 3

[0034] A kind of high reliability low-alloy steel preparation method proposed by the present invention comprises the following steps:

[0035] S1, prepare low-alloy steel raw materials: prepare carbon powder, chromium powder, molybdenum powder, manganese powder, nickel powder, cobalt powder, titanium powder and iron powder, and set aside;

[0036] S2. Ball milling of iron powder: put iron powder in a ball mill, add ball milling aids, and carry out ball milling for 3 hours. During ball milling, the mass ratio of grinding balls to iron powder is 2:1, and the diameter of the grinding balls is 10mm. Steel balls and steel balls with a diameter of 20mm are combined according to the number ratio of 2:1, and refined iron powder can be obtained after ball milling;

[0037] S3. Melting of low alloy steel: 0.75m 3 Feed nitrogen gas into the smelting furnace at a flow rate of / h, and continue for more than 40min, then add the fine iron powder obtained in step S2 into the smelting furnace...

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Abstract

The invention discloses a high-reliability low-alloy steel preparation method. The high-reliability low-alloy steel preparation method comprises the following steps that S1, a low-alloy steel raw material is prepared; S2, iron powder is put into a ball mill, a ball-milling auxiliary is added to carry out ball-milling refining, and refined iron powder is obtained; S3, nitrogen is fed, the refined iron powder is added into a smelting furnace, carbon powder, chromium powder, molybdenum powder, manganese powder, aluminum powder, silica powder, nickel powder, cobalt powder and titanium powder are added and heated so that the raw materials can be smelted, incipient melting liquid is obtained, a refining agent is added into the incipient melting liquid so that refining can be carried out, and low-alloy steel smelting liquid is obtained; and S4, the low-alloy steel smelting liquid is poured into a die, programmed cooling is carried out, quenching and tempering operation are sequentially carried out, after being cooled to 200 DEG C along with the furnace, the product is air-cooled to the room temperature, and the low-alloy steel finished product is obtained. By means of the preparation method, the raw material sources are abundant, the preparation cost is low, the ball-milling efficiency is high, the ball-milling time is short, the preparation efficiency is high, the reproducibility isgood, the reliability is high, and the prepared low-alloy steel is good in strength, tenacity and comprehensive mechanical performance.

Description

technical field [0001] The invention relates to the technical field of low-alloy steel, in particular to a high-reliability low-alloy steel preparation method. Background technique [0002] Ordinary low-alloy steel is an ordinary alloy steel containing a small amount of alloy elements. Generally, the total amount of alloy added is not more than 3.5%. Low-alloy steel has higher strength, better comprehensive performance, and has corrosion resistance and wear resistance. , low temperature resistance, good cutting performance and welding performance, so it is widely used in ships, bridges, boilers, pressure vessels, pipelines, conventional and nuclear power equipment, various vehicles, heavy machinery, construction machinery, transportation and lifting machinery, In the field of marine architecture and high-rise building construction. The currently prepared low-alloy steel products are prone to deformation and cracking during the preparation process, so the reproducibility of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21D1/18C22C38/44C22C38/04C22C38/06C22C38/02C22C38/52C22C38/50B22F9/04
CPCC22C33/04B22F9/04B22F2009/042B22F2009/043C21D1/18C22C33/006C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50C22C38/52
Inventor 罗绍康
Owner 宁波吉威熔模铸造有限公司