Ti microalloying 540MPa-level high reaming steel belt and production method thereof

A technology of microalloying and production method, applied in the field of Ti microalloying 540MPa grade high hole reaming steel strip, which can solve the problems of increased cost and inability to meet the high hole reaming performance of SP series, so as to reduce fuel consumption and reduce vehicle exhaust emissions , The effect of reducing the weight of the vehicle body

Inactive Publication Date: 2019-10-01
TANGSHAN STAINLESS STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the traditional automotive axle bracket steel SAPH440 composition system and hot rolling process, although its hot rolling performance is excellent, it meets the needs of users, but the addition of a large number of alloy elements will lead to an increase in cost, and at the same time cannot meet the high hole expansion performance of the SP series. Require

Method used

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  • Ti microalloying 540MPa-level high reaming steel belt and production method thereof
  • Ti microalloying 540MPa-level high reaming steel belt and production method thereof
  • Ti microalloying 540MPa-level high reaming steel belt and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] In this embodiment, the Ti microalloyed 540MPa grade high hole expansion steel SP252-540F steel strip has a finished thickness of 1.8 mm, and its chemical composition and mass percentage are shown in Table 1.

[0029] The production method of Ti microalloyed 540MPa level high-hole expansion steel SP252-540F steel strip in this embodiment includes converter smelting, LF refining, continuous casting, heating, rough rolling, finish rolling, cooling and coiling procedures, and the specific process steps are as follows Said:

[0030] (1) Continuous casting process: control component segregation through stable casting speed, casting speed 1.45m / min, continuous casting to obtain a billet with a thickness of 200mm and a width of 1280mm, the chemical composition and mass percentage of the continuous casting billet are shown in Table 1;

[0031] (2) Heating process: heating by a walking heating furnace, the total residence time in the heating furnace is 200min, the heating temper...

Embodiment 2

[0038] In this embodiment, the Ti microalloyed 540MPa grade high-expansion steel SP252-540F steel strip has a finished thickness of 2.4mm, and its chemical composition and mass percentage are shown in Table 1.

[0039] The production method of Ti microalloyed 540MPa level high-hole expansion steel SP252-540F steel strip in this embodiment includes converter smelting, LF refining, continuous casting, heating, rough rolling, finish rolling, cooling and coiling procedures, and the specific process steps are as follows Said:

[0040] (1) Continuous casting process: control component segregation through stable casting speed, casting speed 1.50m / min, continuous casting to obtain a billet with a thickness of 200mm and a width of 1250mm, the chemical composition and mass percentage of the continuous casting billet are shown in Table 1;

[0041] (2) Heating process: heating by a walking heating furnace, the total residence time in the heating furnace is 198min, the heating temperature ...

Embodiment 3

[0048] In this embodiment, the Ti microalloyed 540MPa grade high-expansion steel SP252-540F steel strip has a finished thickness of 2.2mm, and its chemical composition and mass percentage are shown in Table 1.

[0049] The production method of Ti microalloyed 540MPa level high-hole expansion steel SP252-540F steel strip in this embodiment includes converter smelting, LF refining, continuous casting, heating, rough rolling, finish rolling, cooling and coiling procedures, and the specific process steps are as follows Said:

[0050] (1) Continuous casting process: control component segregation through stable casting speed, casting speed 1.40m / min, continuous casting to obtain a billet with a thickness of 210mm and a width of 1300mm, the chemical composition and mass percentage of the continuous casting billet are shown in Table 1;

[0051] (2) Heating process: heating by a walking heating furnace, the total residence time in the heating furnace is 180min, the heating temperature ...

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Abstract

The invention discloses a Ti microalloying 540MPa-level high reaming steel belt and a production method thereof. The steel belt comprises, by mass percent, 0.07%-0.11% of C, 1.00%-1.30% of Mn, not larger than 0.015% of S, not larger than 0.020% of P, 0.05%-0.12% of Si, 0.015%-0.040% of Als, 0.020%-0.040% of Ti, not larger than 0.0050% of N, 0.30%-0.36% of Ceq and the balance iron and inevitable impurities. The production method comprises the procedures of converter smelting, LF refining, continuous casting, heating, rough rolling, finish rolling, cooling and coiling. Low carbon, conventional manganese and titanium alloy components are adopted for design, through a cooling path and medium-temperature coiling control, the obtained steel belt is suitable for producing Japanese automobile axlefront brackets and other automobile stamped parts, the body weight can be reduced easily, and fuel consumption can be reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a Ti microalloyed 540MPa high-hole expansion steel strip and a production method thereof. Background technique [0002] At present, the development of my country's automobile industry not only increases the consumption of high-strength steel plates, but also puts forward higher requirements for the quality and performance of steel plates. Using the traditional automotive axle bracket steel SAPH440 composition system and hot rolling process, although its hot rolling performance is excellent, it meets the needs of users, but the addition of a large number of alloy elements will lead to an increase in cost, and at the same time cannot meet the high hole expansion performance of the SP series. Require. [0003] In response to the different needs of Japanese models, Tangsteel Group is committed to further developing the steel for automobile axle brackets in the directi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/14C21D8/02
CPCC21D8/0205C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 张玉文王朋飞闫萍李博贾丽慧吕苗苗周海宝李建设李铁超
Owner TANGSHAN STAINLESS STEEL
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