Method for forecasting and producing narrow hardenability strip steel by hardenability

A hardenability belt and hardenability technology, applied in biological neural network models, special data processing applications, instruments, etc., can solve the problem of low control accuracy and difficulty in meeting the control requirements of high-quality end-quenched steel narrow hardenability belts, etc. It can achieve the effect of simplifying complex nonlinear mapping function relationship, improving forecast accuracy, and eliminating system deviation.

Active Publication Date: 2011-04-27
SHOUGANG CORPORATION
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for hardenability prediction and production of narrow hardenability strip steel, which solves the problem of low control accuracy of conventional hardenability prediction and control methods and difficulty in meeting the requirements of high-quality end-hardened steel narrow hardenability strips. The question of control requirements

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  • Method for forecasting and producing narrow hardenability strip steel by hardenability
  • Method for forecasting and producing narrow hardenability strip steel by hardenability
  • Method for forecasting and producing narrow hardenability strip steel by hardenability

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[0021] Take the narrow hardenability zone control of gear steel 20CrMnTiH as an example. The national standard GB / T5216-2004 stipulates the range of end quenching value: J9 value is 30~42HRC, J15 value is 22~35HRC. When the customer places an order according to the middle limit 4HRC range of J9 and J15 values, that is, the J9 value is 34-38HRC, and the J15 value is 27-31HRC, the production of narrow hardenability steel should be realized as follows.

[0022] Schedule description:

[0023] Table 1 shows the influence coefficients of each element of 20CrMnTiH on J9 and J15 values ​​in a method for hardenability prediction and production of narrow hardenability steel strip according to the present invention.

[0024] Table 2 shows the target composition and control accuracy range of 20CrMnTiH in a hardenability forecast and a method for producing narrow hardenability strip steel in the present invention.

[0025] Table 3 is a 20CrMnTiH alloying charging calculation model for a ...

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Abstract

The invention discloses a method for forecasting and producing narrow hardenability strip steel by hardenability, mainly aiming at steel grade which has a hardenability requirement and evaluates tail-end quenching hardness by a Jominy value. The strip steel comprises pinion steel, hardened and tempered steel, spring steel and bearing steel. The invention combines a BP (back propagation) manual neural network model with an incremental algorithm, takes the component increment of chemical components to a reference furnace as input, takes end quenching value increment of Jominy tail-end quenching hardness to the reference furnace as output, and builds a hardenability forecast model based on an incremental neural network; according to the difference of the end quenching precast value and the end quenching target value of the neural network model, a component rule base gives the adjustment quantity of each element component, and the process of charging is carried out according to the alloy addition calculated by an alloy charging model so as to realize on-line fine tuning and narrow hardenability strip steel control of the chemical components in the molten steel refining process. The method in the invention can be used to produce the end quenching steel of which the hardenability bandwidth is 4HRC.

Description

technical field [0001] The invention relates to a method for hardenability prediction and production of narrow hardenability strip steel, which is suitable for steel grades that have hardenability requirements and whose end quenching hardness is evaluated by Jominy value, including gear steel, quenched and tempered steel, spring steel and bearing steel. Background technique [0002] In recent years, the application field of end-hardened steel (such as gear and bearing industry, etc.) has developed towards the technical direction of high speed, heavy load, precision and low noise, requiring end-hardened steel to have higher processing accuracy and dimensional stability. In order to achieve this goal, the basic requirement for high-quality end-quenched steel is to improve the stability and control accuracy of the hardenability of the steel and reduce the amount of springback after heat treatment. Practice has proved that the narrower the hardenability bandwidth of end-hardene...

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Application Information

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IPC IPC(8): G06F17/50C21D1/55G06N3/02
Inventor 刘锟刘浏何平崔京玉周德光金永春
Owner SHOUGANG CORPORATION
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