Steel plate with thickness of larger than 60mm and yield strength of 690MPa and preparation method of steel plate

A yield strength, steel plate technology, applied in the field of steel, can solve the problems of insufficient utilization of fine grain, phase transformation and dislocation strengthening mechanism, high content of precious metals, complicated heat treatment process, etc., to shorten the delivery cycle and simplify production. Process and comprehensive mechanical properties are superior

Inactive Publication Date: 2015-01-14
SHANDONG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent provides a method for producing 80kg-class steel with low welding crack sensitivity without any heat treatment, 0.04-0.12% of precious metal V is added, resulting in high cost of the steel alloy
[0005] In Chinese patent CN100439545C, a method for manufacturing 8

Method used

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  • Steel plate with thickness of larger than 60mm and yield strength of 690MPa and preparation method of steel plate
  • Steel plate with thickness of larger than 60mm and yield strength of 690MPa and preparation method of steel plate
  • Steel plate with thickness of larger than 60mm and yield strength of 690MPa and preparation method of steel plate

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Embodiment Construction

[0052] The chemical composition of the steel plate with a thickness greater than 60mm and an extra-thick specification with a yield strength of 690MPa is smelted in a converter according to the chemical composition shown in Table 1 and poured into a continuous casting slab or ingot. After the continuous casting slab or ingot is opened, it is heated. Heated in the furnace and rolled by a medium and thick plate rolling mill. After rolling, the steel plate is only subjected to one off-line tempering heat treatment. See Table 2 for main process parameters such as slab discharge temperature, final rolling temperature, and final cooling temperature. The corresponding steel plate tensile properties, longitudinal impact energy at -40°C, and thickness specifications are listed in Table 3. It can be seen that the steel of the present invention has excellent low-temperature impact toughness, and the longitudinal AKv at -40°C is not less than 150J. figure 1 The SEM microstructure photogra...

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Abstract

The invention belongs to the fields of steel and iron and particularly relates to a steel plate with the thickness of larger than 60mm and the yield strength of 690MPa. The steel plate contains the following chemical components in percentage by weight: 0.10-0.20% of C, 0.15-0.50% of Si, 1.20-1.70% of Mn, 0.10-0.40% of Ni, 0.20-0.60% of Cr, 0.01-0.05% of Nb, 0.02-0.06% of V, 0.015-0.050% of Als, 0.008-0.025% of Ti, 0.15-0.45% of Mo, 0.0008-0.0030% of B, less than or equal to 0.025% of P, less than or equal to 0.008% of S, less than or equal to 40ppm of N, less than or equal to 20ppm of O, less than or equal to 2ppm of H and the balance of Fe and unavoidable impurities. The steel plate provided by the invention has favorable mechanical properties, plasticity and toughness, has the yield strength of larger than or equal to 690MPa, and can be applied to manufacture of large engineering machines or steel structures such as hydraulic supports for coal mines, heavy engineering machines, ocean platforms and the like.

Description

technical field [0001] The invention belongs to the technical field of iron and steel. Specifically, the invention relates to a steel plate with a thickness greater than 60 mm and a yield strength of 690 MPa and a preparation method thereof. Background technique [0002] Economic construction and social development require a large amount of high-strength steel. With the vigorous development of domestic steel structure industry, construction machinery, mining machinery and other industries, at the same time, in order to adapt to the large-scale, With the trend of high-strength market demand, the demand for high-strength, high-quality steel for construction machinery is increasingly strong. At the same time, in order to meet the requirements of high-strength steel for reducing the sensitivity of welding cracks, major iron and steel enterprises have invested a lot of manpower and material resources in research and development. [0003] In the Chinese patent CN101812634A, a met...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/54C22C33/04
CPCC22C38/02C21D8/0226C21D2211/002C21D2211/008C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/18C22C38/32
Inventor 杨建勋刘菲孙其家张晓敏尹训强
Owner SHANDONG IRON & STEEL CO LTD
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