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Production method for extra-thick ultrahigh-strength SX690DZ35 steel plate

A SX690DZ35, ultra-high-strength technology, applied in the field of thick plate production, can solve the problems of poor welding performance, poor Z-direction performance, restricting application, etc., to improve welding performance, ensure mechanical properties, and reduce the requirements of controlled cooling and heat treatment.

Inactive Publication Date: 2021-12-28
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional Q690D high-strength steel has poor welding performance, low-temperature impact instability, and poor Z-direction performance, which restricts the application of the industry

Method used

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  • Production method for extra-thick ultrahigh-strength SX690DZ35 steel plate
  • Production method for extra-thick ultrahigh-strength SX690DZ35 steel plate

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Comparison scheme
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Embodiment

[0029] Through converter smelting, LF refining, VD vacuum degassing, die casting, ingot heating, rolling, controlled cooling, stack cooling, tempering and other processes, the 100mm-350mm extra-thick and ultra-high-strength SX690DZ35 with the chemical composition described in Table 1 below is obtained Steel plate, wherein the process parameters and mechanical properties are shown in Tables 1 and 2 below.

[0030] Table 1 is the chemical composition (Wt, %) of 100mm ~ 350mm extra-thick ultra-high strength SX690DZ35 steel plate

[0031]

[0032] Table 2 shows the mechanical and mechanical properties of 100mm ~ 350mm extra-thick ultra-high strength SX690DZ35 steel plate

[0033]

[0034] This time, 6 batches, 9 batches and 3 batches of 150mm, 250mm, and 300mm ultra-thick ultra-high-strength SX690DZ35 steel plates were trial-produced respectively. Through reasonable chemical composition design and production process control, the yield strength of the steel plate was 684-823M...

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Abstract

The invention discloses a production method for an extra-thick ultrahigh-strength SX690DZ35 steel plate. The steel plate comprises the following chemical components, by mass, 0.11-0.13% of C, 0.01-0.15% of Si, 0.95-1.20% of Mn, less than or equal to 0.020% of P, less than or equal to 0.005% of S, 0.03-0.05% of Nb, 0.02-0.04% of V, 0.50-0.60% of Mo, more than 0.45% and less than or equal to 0.55% of Cr, 2.7-3.4% of Ni, 0.2-0.3% of Cu, 0.020-0.050% of Als, less than 0.03% of Zr, less than 0.06% of Ce and the balance Fe and residual elements. The production method comprises the steps of converter smelting, LF refining, VD vacuum degassing, die casting, heating, rolling, Acc controlled cooling and hardening and tempering. Through reasonable chemical component design and production process control, the developed steel plate has excellent performance indexes.

Description

technical field [0001] The invention belongs to the technical field of thick plate production, and in particular relates to a production method of an extra-thick and ultra-high-strength SX690DZ35 steel plate. Background technique [0002] Extra-thick and ultra-high-strength SX690DZ35 steel plate is widely used in heavy machinery, hydropower construction and other industries, which require high strength, good plasticity and toughness, and easy welding. [0003] The traditional Q690D high-strength steel has poor welding performance, low-temperature impact instability, and poor Z-direction performance, which restricts the application of the industry. [0004] How to improve the welding performance, low-temperature impact, and Z-direction performance without affecting the strength, plasticity, and toughness of the steel plate has become a key technical problem to be solved urgently in the current metallurgical industry. Contents of the invention [0005] In view of the above ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/48C22C38/46C22C38/44C22C38/42C22C38/06C22C38/50C21D8/02C21D1/18
CPCC22C38/02C22C38/04C22C38/48C22C38/46C22C38/44C22C38/42C22C38/06C22C38/50C22C38/005C21D8/0226C21D1/18
Inventor 朱书成刘庆波许少普李忠波杨虎全微波康文举袁永旗杨东杨阳薛艳生袁恒
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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