Method and apparatus for predetermining natural ageing performance for hot-rolled steel products

A technology of natural aging and prediction method, applied in the direction of measurement device, analysis material, strength characteristics, etc., can solve the problems affecting user use, economic loss, backlog of funds, etc., to reduce quality objection and economic compensation, improve inspection accuracy, The effect of reducing production costs

Inactive Publication Date: 2005-07-20
MAANSHAN IRON & STEEL CO LTD
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when dealing with such products at present, one is to directly push them to the market or users. If any of them are unqualified, it will inevitably lead to quality objections or economic compensation; Necessary economic loss; the third is product inventory. After more than ten days of natural aging and sampling re-inspe...

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Embodiment Construction

[0008] The implementation scheme of the present invention is that after the hot-rolled steel products are off the production line, they are firstly sampled for production inspection, and those hot-rolled steel products whose performance indicators are slightly higher than the specified standard indicators are then sampled for the second time, processed into re-inspection samples, and manually processed in time. aging treatment. Put the sample to be re-inspected in an oven or a heating furnace with a temperature control device for heating, at a temperature of 100°C-400°C, after heating at a constant temperature for 30-180 minutes, take out the re-inspection sample, and then perform steel performance testing . According to the re-inspection results, the re-inspected steel products shall be classified and processed in a timely manner.

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Abstract

The present invention is especially the performance test of hot rolled steel after simulating natural ageing. The present invention features the artificial ageing for fast treatment and sample detection. The hot rolled steel with performance slightly higher than the specified indexes is sampled to form the re-tested sample; the sample is heated at constant temperature inside stove or furnace and tested for the precise performance indexes after natural ageing; and the re-tested steel is judged and processed based on the detected data. The present invention is favorable to ensuring the product quality, reducing stocks and lowering the production cost.

Description

technical field [0001] The invention belongs to the testing of steel properties, in particular to the testing of the mechanical properties of hot-rolled steel after simulated natural aging treatment. Background technique [0002] Hot-rolled steel generally has "timeliness", that is, the steel strength index decreases and the plasticity index increases within a period of time after rolling. In iron and steel production, the performance indicators of the vast majority of qualified products during production inspection and after natural aging all meet the requirements of the specified standard indicators, which is easy to judge; unqualified products that do not meet the requirements of the specified standard indicators are also easy determination. However, for those products whose performance is slightly higher than the specified standard index during production inspection, some of the products after natural aging, their performance index is within the range required by the sp...

Claims

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Application Information

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IPC IPC(8): C21D8/00G01N3/00
Inventor 方拓野赵明琦
Owner MAANSHAN IRON & STEEL CO LTD
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