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
View PDF5 Cites 43 Cited by
  • 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-tempe

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22C38/54
Inventor 高珊章传国贺达伦
Owner BAOSHAN IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap