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Modified EH550 super-thick steel plate for marine engineering and manufacturing method thereof

A technology for marine engineering and extra-thick steel plates, which is applied in the field of quenched and tempered EH550 extra-thick steel plates for marine engineering and its manufacturing field, which can solve the problem that the thickness specification cannot meet the steel index requirements for offshore platforms, cannot meet the steel index requirements for offshore platforms, and cannot Steel plate core impact toughness and other issues, to achieve the effect of reasonable chemical composition design, good structure and performance uniformity, excellent low temperature plasticity and toughness

Active Publication Date: 2019-01-01
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN201210387796.1 discloses a quenched and tempered high-strength steel plate for large-thickness marine engineering and its production method. Although the thickness has reached more than 100mm, its yield strength is only 475MPa, which cannot meet the demand for ultra-high-strength tempered steel plates for marine engineering steel , and its composition system adopts high C (0.15% ~ 0.17%), high Mn (1.45% ~ 1.60%) system, which is very unfavorable to the subsequent welding performance
[0005] CN201210189994.7 discloses a low-compression-ratio ultra-high-strength steel plate for marine engineering and its production method. It adopts ultra-high Ni content (0.90% to 1.30%) and has a very high alloy composition. The demand for ultra-high-strength steel plates, but its thickness specification is only 25mm, which is far from meeting the needs of modern marine engineering for large-thickness steel plates
[0006] CN201510321655.3 discloses an extra-thick quenched and tempered EH40 steel for marine engineering and its preparation method, which adopts a quenching + tempering heat treatment process, which cannot make the core of the steel plate obtain good impact toughness, although the thickness of the product is 100- 120mm, but the strength level is only 40, which cannot meet the steel index requirements for higher-level offshore platforms
[0007] CN201210545542.8 discloses a method for manufacturing extra-thick steel plates for marine engineering with excellent low-temperature brittle fracture resistance. Although the low-temperature toughness index of -40°C is also reached, the maximum thickness of the product is 80 mm, but the Mn content in the steel is 1.60%, which is not conducive to Subsequent steel plate welding performance, and the strength level is only 36, which cannot meet the requirements of higher-level steel indicators for offshore platforms in terms of thickness specifications and strength levels

Method used

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  • Modified EH550 super-thick steel plate for marine engineering and manufacturing method thereof
  • Modified EH550 super-thick steel plate for marine engineering and manufacturing method thereof
  • Modified EH550 super-thick steel plate for marine engineering and manufacturing method thereof

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Embodiment Construction

[0039] The following examples are used to specifically illustrate the contents of the present invention, and these examples are only general descriptions of the contents of the present invention, and do not limit the contents of the present invention.

[0040] Table 1 is the chemical composition of the steel of the embodiment of the present invention, Table 2 is the rolling and heat treatment process of the steel of the embodiment of the present invention; Table 3 is the tensile and impact properties of the steel of the embodiment of the present invention.

[0041] Table 1 The chemical composition of steel in the embodiment of the present invention wt%

[0042]

[0043] Table 2 steel rolling method of the embodiment of the present invention

[0044]

[0045] Table 3 Tensile and impact properties of the steel of the embodiment of the present invention

[0046]

[0047] It can be seen from the examples that the primary quenching + secondary sub-temperature quenching + ...

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Abstract

The invention discloses a modified EH550 super-thick steel plate for marine engineering and a manufacturing method thereof. The steel contains 0.08% to 0.15% of C, 0.20% to 0.55% of Si, 0.80% to 1.35%of Mn, less than or equal to 0.01% of P, less than or equal to 0.03% of S, 0.04% to 0.08% of V, 0.015% to 0.45% of Als, 0.003-0.015% of N, 0.50-0.90% of Ni, 0.20-0.40% of Cr, 0.002-0.03% of Mo, 0.02%to 0.05% of Nb, 0.20-0.40% of Cu, less than or equal to 0.04% of Ti, and the balance of Fe and unavoidable impurities. The method employs two-stage controlled rolling, the first-stage rolling temperature is 1100-1150 DEG C, the one-stage finishing rolling temperature is 990-1130 DEG C, the second-stage rolling temperature is 700-780 DEG C, and the final rolling temperature is 680-750 DEG C. The heat treatment method of quenching before sub-quenching is used, and after quenching, the steel plate is tempered, and the steel plate having a thickness of 80-100 mm is obtained. The impact toughnessof a core is more than 200J, and the comprehensive performance is uniform at different positions.

Description

technical field [0001] The invention belongs to the field of iron and steel material preparation, and relates to an ultra-high-strength, thick structural steel plate used in marine engineering, in particular to quenched and tempered EH550 extra-thick steel plate for marine engineering and a manufacturing method thereof. Background technique [0002] In recent years, with people's continuous exploration and development of the ocean field, the steel required for the matching ocean engineering and its research and development and production have become the top priority. Since the service time of the ocean platform is 50% longer than that of the ship, more The increasingly complex marine service environment determines that steel for marine engineering must have high strength, high toughness, fatigue resistance, lamellar tear resistance, good weldability, seawater corrosion resistance, and good cold workability. The traditional steel plates for offshore platforms below 80mm have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/48C22C38/46C22C38/44C22C38/42C22C38/50C22C38/06C21D8/02
CPCC21D1/18C21D8/02C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 张鹏严玲周成朱隆浩韩鹏陈华肖青松黄松海天王勇
Owner ANGANG STEEL CO LTD
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