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70 kg-class TMCP type high-strength steel and method for manufacturing extend rate detection samples thereof

A manufacturing method and high-strength steel technology, applied in the field of metallurgy, can solve problems such as unqualified product elongation, inappropriate sampling methods, and low compliance rate of steel plate elongation, so as to reduce the use cost and increase the elongation after fracture.

Inactive Publication Date: 2014-08-27
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, due to the low elongation rate of the steel plate itself and the inappropriate sampling method of the manufacturer, the elongation rate of the product tested by the manufacturer is completely unqualified, which affects the order delivery and the customer's service life.

Method used

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  • 70 kg-class TMCP type high-strength steel and method for manufacturing extend rate detection samples thereof
  • 70 kg-class TMCP type high-strength steel and method for manufacturing extend rate detection samples thereof
  • 70 kg-class TMCP type high-strength steel and method for manufacturing extend rate detection samples thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] a. Adopt KR hot metal desulfurization pretreatment → converter smelting → (deoxidation alloying) → CAS refining → LF refining → VD (RH) process, so that the weight percentage (%) of molten steel composition at the end of refining is controlled at C: 0.05% , Mn: 1.75%, B: 0.0013%, P≤0.015%, S≤0.010%;

[0024] b. Use CCM machine continuous casting to obtain continuous casting slabs of 250*2000*2700mm, and then slowly cool the slabs for more than 48 hours;

[0025] c. Slab reheating: the heating rate of the cold material is controlled above 10min / cm, and the heating temperature is 1100℃~1220℃;

[0026] d. Descaling: high-pressure water descaling, one descaling reaches 100%, and the furnace temperature (maximum temperature measured after descaling): 1060±10°C;

[0027] e. Rolling (rough rolling + finishing rolling): Rough rolling and finishing rolling are rolled in stages for 8 passes each, the maximum pass reduction of the rough rolling mill is 35mm, and the maximum pass ...

Embodiment 2

[0034] The production and preparation method is the same as in Example 1, except that the TMCP process is used. The target final rolling temperature is 800±10°C, the final cooling temperature is 525±10°C, the cooling rate is 16°C / S, and rolled into a steel plate with a thickness of 20mm.

[0035] Sampling process: fire-cut sampling, the width of the sample is 120mm, the samples are stacked together and covered with asbestos on the surface of the sample for heat preservation (60-80°C) for 24 hours. The sample is processed into a Φ10 round bar sample, and a universal tensile machine (model: SHT5206-P-2) is used to test the second small branch head of the motherboard for more than 72 hours. The test results are as follows.

[0036]The main data of the 20mm performance of the finished board within 72 hours using the round bar test method are as follows: specified non-proportional elongation strength: 613MPa, tensile strength: 780MPa, elongation after fracture: 18.5%, and longitudin...

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Abstract

The invention discloses a piece of 70 kg-class TMCP type high-strength steel and a method for manufacturing extend rate detection samples of the 70 kg-class TMCP type high-strength steel. The low-carbon, high-manganese and boron-charged component design is adopted, the 70 kg-class TMCP type high-strength steel is produced through the TMCP process, the finish rolling temperature ranges from 810 DEG C to 850 DEG C, the finish cooling temperature ranges from 450 DEG C to 550 DEG C, stacking slow cooling is conducted offline for at least 72 hours after cooling is further conducted through a cooling table, and then the 70 kg-class TMCP type high-strength steel is obtained. Fire cut sampling is further conducted, concentrated stacking is conducted for 24 hours, the surfaces of the samples are covered with asbestos so that heat preservation can be achieved, all the samples are machined to be round bar samples with the diameter of 10, and then the extend rate detection samples are obtained. Stacking slow cooling is conducted on steel plates, and therefore residual stress inside the steel plates is released, and the post-breakage extend rate of the steel plates is greatly increased and reaches more than 18%. By means of special sample cutting and thermal insulation treatment, the influences of fire cut on performance are greatly reduced; the samples are machined into the round bar samples, and therefore the detection percent of pass of the products is larger than 98%.

Description

technical field [0001] The invention relates to a high-strength steel and a method for manufacturing a test sample thereof, in particular to a 70kg grade TMCP type high-strength steel and a method for manufacturing the elongation test sample thereof, belonging to the technical field of metallurgy. Background technique [0002] 70kg grade high-strength steel is a low-alloy high-strength structural steel plate, which is mainly supplied to industrial sectors such as machinery, coal, transportation and mining, and is used for important high-strength structural parts, engineering machinery, and mining steel structural parts. At present, the production of 70kg high-strength steel mainly adopts the TMCP production process. TMCP (thermomechanical control process) is a general term for the technology of air cooling or controlled cooling and accelerated cooling in the hot rolling process on the basis of controlled rolling with controlled heating temperature, rolling temperature and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C22C38/04
Inventor 刘海波薛艳龙孔雅陆焱史金柱谢晖董连委张广川张建辉刘洋洋
Owner JIGANG GRP
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