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Low carbon 520MPa grade composite fortified ultra fine crystal grain band steel

A technology of ultra-fine grain and strip steel, which is applied in the field of preparation of low-carbon high-strength steel, can solve the problems of super-SS400 steel such as low tensile strength, poor formability, and large gap, so as to improve performance, promote replacement, The effect of reducing the cost of steel materials

Inactive Publication Date: 2004-10-20
NORTHEASTERN UNIV
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Problems solved by technology

Whether it is from the mechanical properties of the above-mentioned steel or the metallographic structure of the steel, it can be explained that the tensile strength of the super-SS400 steel obtained in the experiment is still low, and the yield strength is relatively large, which makes the formability in the application poor; The gap in the test mechanical performance data is large, indicating that this technical scheme can improve the process conditions of the existing carbon-manganese steel with a yield strength of 200MPa to 400MPa structural steel, which still needs further research and should be solved.

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  • Low carbon 520MPa grade composite fortified ultra fine crystal grain band steel

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Embodiment Construction

[0017] According to the chemical composition range set by the ultra-fine-grained strip steel of the present invention, two groups are selected, numbered as A, B, and C, which are respectively smelted on a 200-ton converter, and continuously cast into a continuous casting slab of 250mm × 1300mm × 10020mm, at 2050 Rolled on a hot rolling mill. The selected chemical components are listed in Table 1, the TMCP process conditions are listed in Table 2, the corresponding mechanical properties are listed in Table 3, and the metallographic structure test results are listed in Table 4. The metallographic structure is shown in Figure 1.

[0018] The chemical composition (weight, %) of table 1 embodiment ultra-fine grain strip steel

[0019] Code C Si Mn Nb S S Fe

[0020] A 0.13 0.20 1.25 0.007 0.009 0.01 Margin

[0021] B 0.12 0.35 1.10 0.009 0.008 0.009 Margin

[0022] C 0.15 0.40 1.30 0.013 0.007 0.006 Margin

[0023] Table 2 TMCP process system

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Abstract

A 520 MPa-class low-carbon band steel with superfine crystal grains contains C (0.12-0.15 wt.%), Si (0.15-0.40), Mn (1.10-1.30), Nb (0.007-0.015), P (0-0.01), S (0-0.001 and Fe (rest), and is prepared through smelting, conticasting, heating, rolling twice, cooling and winding. Its advantages are multi-phase structure including ferrite, bainite and pearlite, high yield strength (520-570 MPa), high tension strength (620-690 MPa) and low cost. It can replace high-strength low-alloy steel.

Description

Technical field [0001] The invention relates to a preparation method of low-carbon high-strength steel, in particular to a low-carbon 520MPa grade composite strengthened ultra-fine grain strip steel. Background technique [0002] At present, iron and steel materials are still the main body of structural materials. However, with the development of society and economy, the steel industry is under increasing pressure to save resources, save energy, and protect the environment. Therefore, it has become a hot spot in the field of iron and steel research to use special processing techniques for traditional iron and steel materials to greatly improve their performance, prolong their service life, and effectively improve resource utilization and recovery. [0003] In 1997 and 1998, Japan and South Korea successively launched a research program on structural materials for the 21st century. The goal is to double the practical strength and structural life of existing steel on the prem...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/12
Inventor 杜林秀王国栋刘相华吴迪高彩茹丁桦
Owner NORTHEASTERN UNIV
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