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Method for detecting residual strain of thermal-continuous-rolled high-strength steel plate

A high-strength steel plate, residual stress technology, applied in the direction of testing metals, measuring the properties of piezoelectric resistance materials, material inspection products, etc. Improved, convenient for long-distance measurement, and high sensitivity

Inactive Publication Date: 2007-06-13
BAOSHAN IRON & STEEL CO LTD +1
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Problems solved by technology

[0002] Recently, with the continuous increase in the development of new hot-rolled products, the following problems have been exposed in the production of high-strength hot-rolled steel sheets and strips: hot-rolled products are prone to side bending, warping, etc. The quality problem of poor shape of the finished product
Therefore, the results obtained by the magnetic memory method are only very sensitive to points with sudden stress changes, and are not good at accurately describing the numerical distribution of residual stress.

Method used

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  • Method for detecting residual strain of thermal-continuous-rolled high-strength steel plate
  • Method for detecting residual strain of thermal-continuous-rolled high-strength steel plate
  • Method for detecting residual strain of thermal-continuous-rolled high-strength steel plate

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specific Embodiment

[0034] A test method for residual stress of hot continuous rolling high-strength steel plate, which comprises the following steps:

[0035] Step 1. Select measuring points: As shown in Figure 1, on the sample with a length of 1500mm, arrange a measuring point every 150mm, and arrange 9 measuring points in total;

[0036] Step 2, sample surface preparation: the surface of the sample to be prepared is polished with emery cloth to remove rust, and the oil stain is cleaned with acetone;

[0037] Step 3. Arrange and paste the strain gauges at the measurement points: as shown in Figure 2, use the BE120-2CA strain rosette to arrange the strain gauges at the measurement points, on the bonding surface of the strain gauges and the position where the strain gauges are to be pasted on the sample measurement points Spread evenly with glue, and put a layer of polytetrafluoroethylene film on the strain gauge, press for 1 to 2 minutes;

[0038] Step 4, signal connection: the lead wire of the...

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Abstract

The invention relates to a measuring method for testing hot continuous rolling dead-hard steel board residual stress. It uses electric resistance strain gauge to take measuring to residual stress of the sample and calculating the value, analyzing the distribution of the full sample residual stress. The method has stable reliability, accurate result, and could rapidly measure hot continuous rolling dead-hard steel board residual stress. It supplies theory foundation and technology support for hot continuous rolling dead-hard steel board, and improves the quality of the product.

Description

technical field [0001] The invention relates to a method for testing the residual stress of hot continuous rolling high-strength steel plates. Background technique [0002] Recently, with the continuous increase in the development of new hot-rolled products, the following problems have been exposed in the production of high-strength hot-rolled steel sheets and strips: hot-rolled products are prone to side bending, warping, etc. The quality problem of poor shape of the finished product. However, the residual stress inside the steel plate is closely related to the poor shape of the finished product. Due to the lack of understanding of the residual stress distribution of the hot-rolled high-strength steel plate, it is impossible to effectively analyze and optimize the existing straightening process to improve the shape of the high-strength steel plate. the quality of. [0003] At present, there are mainly three kinds of internal stress measurement methods: [0004] 1. Measur...

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Application Information

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IPC IPC(8): G01N33/20G01L1/18
Inventor 杨晓臻赵志毅张春丽
Owner BAOSHAN IRON & STEEL CO LTD
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