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Ultra-thick high-strength high low-temperature toughness steel plates for ocean platforms and production method thereof

An offshore platform, low temperature toughness technology, applied in the field of low alloy quenched and tempered steel manufacturing, can solve the problems of low temperature impact toughness can not meet, can not use pile leg material, does not meet relevant standards, specification requirements, etc., to achieve excellent welding performance, good welding performance The effect of cutability

Inactive Publication Date: 2012-07-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, like the aforementioned patents, the anchor chain steel is a bar, and its C, Cr, and Ni contents do not meet the relevant standards and specification requirements of rack steel for offshore platforms, and its low-temperature impact toughness cannot meet the requirements of rack steel for offshore platforms. According to the relevant standards of bar steel, it cannot be used as a load-bearing pile leg material for large offshore platform structures

Method used

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  • Ultra-thick high-strength high low-temperature toughness steel plates for ocean platforms and production method thereof
  • Ultra-thick high-strength high low-temperature toughness steel plates for ocean platforms and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1、7

[0054] It is used to manufacture thick steel plates with a thickness specification of 40.0mm.

[0055] 1. Smelting, casting, RH and LF smelting;

[0056] 2. Blooming, heating temperature for blooming: 1270℃; temperature for blooming and rolling: 980℃; temperature for slow cooling out of the first rolling pit: 300℃; stress relief annealing temperature: 500℃; Stress relief annealing holding time: 11 hours;

[0057] 3. Rolling, thick plate rolling heating temperature: 1090°C; thick plate rolling finish rolling temperature: 930°C; thick plate rolling pit slow cooling temperature 150°C;

[0058] 4. Heat treatment, quenching heating temperature: 975°C; tempering heating temperature: 660°C.

Embodiment 2、3

[0060] 1. It is used to manufacture thick steel plates with a thickness specification of 200.0mm.

[0061] 2. Smelting, casting, RH and LF smelting;

[0062] 3. Blooming, heating temperature for blooming: 1290°C; temperature for blooming and rolling: 930°C; temperature for slow cooling out of the first rolling pit: 350°C; stress relief annealing temperature: 550°C;

[0063] 4. Rolling, thick plate rolling heating temperature: 1100°C; thick plate rolling finish rolling temperature: 940°C; thick plate rolling pit slow cooling pit temperature 200°C;

[0064] 5. Heat treatment, quenching heating temperature: 935°C; tempering heating temperature: 650°C.

Embodiment 4、8

[0066] It is used to manufacture thick steel plates with a thickness specification of 127.0mm.

[0067] 1. Smelting, casting, RH and LF smelting;

[0068] 2. Blooming, heating temperature for blooming: 1280°C; temperature for blooming and rolling: 1030°C; temperature for slow cooling out of the first rolling pit: 250°C; stress relief annealing temperature: 580°C;

[0069] 3. Rolling, thick plate rolling heating temperature: 1170°C; thick plate rolling finish rolling temperature: 920°C; thick plate rolling pit slow cooling pit temperature 100°C.

[0070] 4. Heat treatment, quenching heating temperature: 975°C; tempering heating temperature: 620°C.

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Abstract

Disclosed are ultra-thick high-strength high low-temperature toughness steel plates for ocean platforms and a production method thereof. The steel plates comprise, in weight percentage, 0.10-0.24% of C, 0.05-0.35% of Si, 0.60-1.15% of Mn, not more than 0.015% of P, not more than 0.005% of S, 0.01-0.030% of Ti, 1.45-1.75% of Cr, 0.15-0.44% of Mo, 0.80-2.50% of Ni, 0.010-0.070% of Nb, 0.020-0.080% of V, 0.02-0.06% of Alt, 0.001-0.004% of Ca, not more than 0.006% of N, 0.0007-0.0030% of B, the balance of F3 and unavoidable impurities. The steel plates have a system of C, Ni-Cr-Mo alloyed and Nb-V-Ti microalloyed, and have yield strength not smaller than 690MPa, tensile strength not smaller than 770MPa, -40 DEG C Charpy V-notch impact work no smaller than 69J, NDT (non-destructive testing) not larger than -35 DEG C, Z not smaller than 35%, and largest thickness more than 200mm. The steel plates are applicable to production of racks for ocean platforms.

Description

technical field [0001] The invention relates to the field of low-alloy quenched and tempered steel manufacturing, in particular to an extra-thick, high-strength, excellent low-temperature toughness steel plate for offshore platforms and a manufacturing method thereof. Work ≥ 69J, NDT ≤ -35 ​​℃, Z ≥ 35%, the maximum thickness is over 200mm. Background technique [0002] In recent years, the rapid development of the world economy has intensified the consumption of energy. The exploitation of energy such as oil and gas has gradually extended from land to offshore and deep sea. Continuous progress in steel for offshore platforms. [0003] The steel used for offshore platforms is developed on the basis of hull structural steel, and the first steel platforms were built with hull structural steel. With the advancement of science and technology and the vigorous development of marine development, the number and types of offshore platforms are increasing continuously; at the same ti...

Claims

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Application Information

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IPC IPC(8): C22C38/54
Inventor 高珊章传国贺达伦
Owner BAOSHAN IRON & STEEL CO LTD
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