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Thin gauge carriage body steel belt with yield strength of 600MPa, and manufacturing method of thin gauge carriage body steel belt

A yield strength and manufacturing method technology, which is applied in the field of thin-size box body steel strip with a yield strength of 600 MPa and its manufacturing field, can solve the problems of large production difficulties, tail flicking and poor plate shape, etc. Effects of formability and weldability

Inactive Publication Date: 2017-05-10
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the production process of the existing steel for the car body, the problems of flicking and poor plate shape are prone to occur, and the production is difficult

Method used

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  • Thin gauge carriage body steel belt with yield strength of 600MPa, and manufacturing method of thin gauge carriage body steel belt
  • Thin gauge carriage body steel belt with yield strength of 600MPa, and manufacturing method of thin gauge carriage body steel belt
  • Thin gauge carriage body steel belt with yield strength of 600MPa, and manufacturing method of thin gauge carriage body steel belt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The raw material molten iron is subjected to deep desulfurization of molten iron, converter top and bottom blowing, ladle blowing argon, LF refining outside the furnace and continuous casting process to obtain a 230mm thick slab with the chemical composition weight percentage shown in Table 1. The heating temperature of the slab is 1275°C, and the heating time is 185 minutes. The rough rolling is carried out in the R1 and R2 rough rolling mills, and the "3+3" passes are adopted. More than one pass is controlled at more than 20%; finish rolling is carried out in F1-F7 finish rolling mills, and the deformation of each pass is strictly controlled during finish rolling. Steel strip thickness 2.5mm. After rolling, the steel strip enters the laminar flow cooling system, and the average coiling temperature is 589° C., and finally the steel strip can be obtained.

Embodiment 2

[0040] The implementation is the same as in Example 1, wherein the heating temperature is 1271°C, the temperature is kept for 188 minutes, the finish rolling start temperature is 1003°C, the start rolling thickness is 39mm, the finish rolling temperature is 890°C, and the finished strip thickness is 2.75mm. After rolling, the steel strip enters the laminar flow cooling system, and the average coiling temperature is 588° C., and finally the steel strip can be obtained.

Embodiment 3

[0042] The implementation is the same as in Example 1, wherein the heating temperature is 1270°C, and the temperature is kept for 185 minutes; the finish rolling start temperature is 989°C, the start rolling thickness is 41mm, the finish rolling temperature is 884°C, and the finished steel strip thickness is 3.0mm. After rolling, the steel strip enters the laminar flow cooling system, and the average coiling temperature is 586°C, and finally the steel strip can be obtained.

[0043] Table 1 Chemical composition (wt %) of embodiment 1~3 of the present invention

[0044] Example C Si mn P S Nb Ti Alt 1 0.06 0.20 1.53 0.012 0.009 0.025 0.080 0.02 2 0.07 0.16 1.60 0.015 0.008 0.031 0.084 0.03 3 0.08 0.10 1.65 0.013 0.006 0.033 0.095 0.04

[0045] The steel plates of Examples 1-3 of the present invention were tested for their mechanical properties, and the test results are shown in Table 2.

[0046] The mechanical prop...

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Abstract

The invention discloses a thin gauge carriage body steel belt with a yield strength of 600MPa. The thin gauge carriage body steel belt is prepared from the following chemical components by weight percent: 0.06-0.08% of C, less than or equal to 0.20% of Si, 1.5-1.7% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.10-0.04% of Alt, 0.025-0.035% of Nb, 0.08-0.10% of Ti and the balance of Fe and unavoidable impurities. The invention also discloses a manufacturing method of the thin gauge carriage body steel belt with the yield strength of 600MPa. The manufacturing method comprises the steps of converter steel making, ladle furnace (LF) refining, continuous casting, slab heating, rack rough rolling, rack finish rolling, laminar cooling and reeling. By adopting a low-carbon microalloy composition design, the obtained steel belt has good cold roll forming performance.

Description

technical field [0001] The present invention relates to a low-alloy high-strength steel technology, in particular to a thin-gauge car body steel strip with a yield strength of 600MPa and its manufacturing method Background technique [0002] With the rapid development of the domestic commercial automobile industry, users have put forward higher requirements for reducing the weight of automobiles, reducing fuel consumption, improving the strength of automobile structural parts and safety performance. High-strength and thin specifications have become the development trend of steel for car bodies. Steel for car bodies is mainly used to manufacture commercial vehicle cars. By adding Nb and Ti microalloying elements, extremely fine grain structure and precipitation strengthening are obtained. The strength and toughness of steel can be matched extremely high, and at the same time, it has good formability and welding performance. Thin-gauge steel strips (2.0-3.0mm) occupy a large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/04C21D8/02
CPCC22C38/02C21D8/0226C22C33/04C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 曹晓明张秀飞刘德勤白海瑞杨雄郭冬青
Owner INNER MONGOLIA BAOTOU STEEL UNION
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