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Production of 40cr steel plate for 200mm thick straightening machine bearing seat by rolling instead of forging and its production process

A production process and straightening machine technology, applied in the field of 40Cr steel plate and production process, can solve the problems of high content of steel inclusions and unstable flaw detection quality, and achieve the effect of ensuring internal quality, reducing core defects and tight organization

Active Publication Date: 2019-12-31
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, in order to obtain a good quenching and tempering quality, the blank should be rough turned, and the bar should be forged. There are problems such as looseness and segregation, the content of steel inclusions is high, and the quality of flaw detection is unstable.

Method used

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  • Production of 40cr steel plate for 200mm thick straightening machine bearing seat by rolling instead of forging and its production process
  • Production of 40cr steel plate for 200mm thick straightening machine bearing seat by rolling instead of forging and its production process
  • Production of 40cr steel plate for 200mm thick straightening machine bearing seat by rolling instead of forging and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The production process of 40Cr steel plate for 200mm thick straightening machine bearing housing by rolling instead of forging:

[0036] The content of trace elements in molten iron is as follows: Sn 0.02%, As 0.004%, Sb 0.02%, Zn 0.02%.

[0037] Molten iron pretreatment: through KR molten iron pretreatment, slag removal to ensure that the thickness of the slag layer is controlled below 10mm, after desulphurization, ensure that the S content is ≤0.010%; ≤0.100%, the total amount of molten iron and steel is controlled at an ingot weight of 8t;

[0038] Top-bottom combined blowing converter: The converter reasonably controls the position of the gun, adopts single slag operation to ensure that the tapping carbon is ≥ 0.12%, and the tapping P is ≤ 0.015%; If the slag stop cone fails to be placed, the furnace will be lifted in advance to avoid slag during the tapping process; the deoxidizer silicon aluminum calcium barium will be deoxidized at 1.3kg / t during the tapping pro...

Embodiment 2

[0047] The production process of producing 40Cr steel plates for 200mm thick straightening machine bearing seats by rolling instead of forging includes the following steps:

[0048] The content of trace elements in molten iron is as follows: Sn 0.05%, As 0.006%, Sb 0.04%, Zn 0.03%.

[0049] Molten iron pretreatment: through KR molten iron pretreatment, slag removal to ensure that the thickness of the slag layer is controlled below 10mm, after desulphurization, ensure that the S content is ≤0.010%; ≤0.100%, the total amount of molten iron and steel is controlled at an ingot weight of 8.5t;

[0050] Top-bottom combined blowing converter: The converter reasonably controls the position of the gun, adopts single slag operation to ensure that the tapping carbon is ≥ 0.12%, and the tapping P is ≤ 0.015%; If the slag stop cone fails to be placed, the furnace will be lifted in advance to avoid slag during the tapping process; the deoxidizer silicon aluminum calcium barium will be deox...

Embodiment 3

[0059] The production process of producing 40Cr steel plates for 200mm thick straightening machine bearing seats by rolling instead of forging includes the following steps:

[0060] The content of trace elements in molten iron is as follows: Sn 0.04%, As 0.01%, Sb 0.03%, Zn 0.02%.

[0061] Molten iron pretreatment: through KR molten iron pretreatment, slag removal to ensure that the thickness of the slag layer is controlled below 10mm, after desulphurization, ensure that the S content is ≤0.010%; ≤0.100%, the total amount of molten iron and steel is controlled at an ingot weight of 9.5t;

[0062] Top-bottom combined blowing converter: The converter reasonably controls the position of the gun, adopts single slag operation to ensure that the tapping carbon is ≥ 0.12%, and the tapping P is ≤ 0.015%; If the slag stop cone fails to be placed, the furnace will be lifted in advance to avoid slag during the tapping process; the deoxidizer silicon aluminum calcium barium will be deoxi...

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Abstract

The invention discloses a 40Cr steel plate for producing a 200mm thickness bearing block of a straightening machine through replacing forging with rolling and a production process, belongs to the technical field of production of medium-thick plates. The steel plate comprises the following chemical components of, by mass, 0.38-0.42% of C, 0.20-0.35% of Si, 0.65-0.75% of Mn, less than or equal to 0.018% of P, less than or equal to 0.005% of S, 0.90-1.00% of Cr, and the balance Fe and residual elements. The process flow comprises the following steps of molten iron adoption, molten iron pretreating, a top-bottom combined blowing converter, LF refining, VD vacuum refining, pouring, water-cooling mold casting, slow cooling I, cleaning, furnace loading and heating, rolling, high-temperature slowcooling, high-temperature cutting, slow cooling II, heat treatment, slow cooling III, performance detection, finishing, flattening, external inspection and storage. By adopting water-cooled crystallizer ingot mold technology and process which are independently researched and developed by the factory, the content of impurities and gas in the molten iron is removed, the cleanliness of the molten iron is guaranteed, the internal quality and the components of steel ingots are uniform, the internal flaw detection quality of the steel plate meets requirements of level I forgings of JB / T5000.15-2007,the grain size is controlled to be within level 8.0-10.0, and the total amount of the impurities is controlled to be within level 2.0.

Description

technical field [0001] The invention relates to the technical field of medium and heavy plate production, in particular to a 40Cr steel plate for bearing seats of a straightening machine with a thickness of 200mm produced by rolling instead of forging and a production process. Background technique [0002] The 40Cr used in the straightening machine bearing seat has high internal quality requirements, and there must be no equivalent defects above φ2 in the interior. Generally, forgings are used for production to ensure the quality of internal flaw detection. 40Cr produced by conventional smelting and rolling methods has unstable flaw detection quality due to problems such as porosity and segregation, and it is difficult to meet the first-level flaw detection requirements of forgings JB / T5000.15-2007. [0003] The patent document whose publication number is CN103468858A discloses a preparation method of Shuigang 40Cr steel. The preparation method steps include: molten iron, sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/18
Inventor 朱书成陈熙许少普李忠波张涛李亮陈良张国栋刘庆波唐郑磊张占杰康文举袁书欣董真真庞百鸣王英杰袁永旗于飒许鑫袁继恒郑海明全微波朱先兴袁高俭白艺博符可义杨阳蒋鹏薛艳生杨春赵运启
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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