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Copper-containing low-carbon high-strength high-ductility steel for ocean platform and preparation method thereof

A high-strength, high-toughness, offshore platform technology, applied in the field of metallurgy, can solve problems such as increased smelting cost, high production cost, and affect weldability, and achieve the effects of improving comprehensive mechanical properties, reducing production costs, and reducing carbon content.

Inactive Publication Date: 2018-06-19
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the above patents, it can be seen that the Ni content of the large-thickness offshore platform rack steel increases with the thickness, so the smelting cost also increases accordingly; the carbon equivalent is high, which affects the weldability; in addition, the extra-thick plate needs to be used twice Cyclic quenching to harden the core tissue, resulting in high production costs

Method used

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  • Copper-containing low-carbon high-strength high-ductility steel for ocean platform and preparation method thereof
  • Copper-containing low-carbon high-strength high-ductility steel for ocean platform and preparation method thereof
  • Copper-containing low-carbon high-strength high-ductility steel for ocean platform and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Smelting, refining and casting according to the set composition to make cast slab, the composition of slab contains C 0.06%, Si0.15%, Mn 0.95%, Mo 0.4%, Ni 2.3%, Cr0.5%, Cu 1.0% by weight percentage , Nb 0.05%, V 0.08%, Al 0.02%, P 0.025%, S 0.010%, the balance is Fe;

[0030] Reheat the billet to the austenitizing temperature, control the heating temperature at 1100°C, keep it warm for two hours, and forge it into a billet with a cross-sectional size of 100mm×120mm;

[0031] Heat the billet to 1200°C for 2 hours, and carry out the first-stage and second-stage rolling in the austenite recrystallization zone and the non-recrystallization zone respectively. The first-stage rolling temperature is 1150°C, and the second-stage rolling temperature is is 900°C, and the final rolling temperature is 830°C; the total reduction rate in the first stage is 56.7%, and the total reduction rate in the second stage is 53.8%, to obtain hot-rolled steel sheets;

[0032] Air-cool the hot-...

Embodiment 2

[0034] Smelting, refining and pouring according to the set composition to make cast slab, the composition of cast slab contains C 0.11%, Si0.35%, Mn 1.3%, Mo 0.6%, Ni 2.8%, Cr1.0%, Cu 2.0% by weight percentage , Nb 0.04%, V 0.06%, Al 0.04%, P 0.01%, S 0.008%, the balance is Fe;

[0035] Reheat the billet to the austenitizing temperature, control the heating temperature at 1150°C, keep it warm for two hours, and forge it into a billet with a cross-sectional size of 100mm×120mm;

[0036]Heat the billet to 1200°C for 2 hours, and carry out the first-stage and second-stage rolling in the austenite recrystallization zone and the non-recrystallization zone respectively. The first-stage rolling temperature is 1150°C, and the second-stage rolling temperature is is 900°C, and the final rolling temperature is 830°C; the total reduction rate in the first stage is 56.7%, and the total reduction rate in the second stage is 53.8%, to obtain hot-rolled steel sheets;

[0037] Air-cool the ho...

Embodiment 3

[0039] Smelting, refining and casting according to the set composition to make cast slab, the composition of cast slab contains C 0.08%, Si0.2%, Mn 1.0%, Mo 0.5%, Ni 2.5%, Cr 0.7%, Cu 1.5%, Nb 0.03%, V 0.04%, Al 0.06%, P 0.015%, S 0.005%, the balance is Fe;

[0040] Reheat the billet to the austenitizing temperature, control the heating temperature at 1200°C, keep it warm for two hours, and forge it into a billet with a cross-sectional size of 100mm×120mm;

[0041] Heat the billet to 1200°C for 2 hours, and carry out the first-stage and second-stage rolling in the austenite recrystallization zone and the non-recrystallization zone respectively. The first-stage rolling temperature is 1150°C, and the second-stage rolling temperature is is 900°C, and the final rolling temperature is 830°C; the total reduction rate in the first stage is 56.7%, and the total reduction rate in the second stage is 53.8%, to obtain hot-rolled steel sheets;

[0042] Air-cool the hot-rolled steel plate...

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Abstract

The invention belongs to the technical field of metallurgy and particularly relates to copper-containing low-carbon high-strength high-ductility steel for an ocean platform and a preparation method thereof. The copper-containing low-carbon high-strength high-ductility steel for oceanographic engineering consists of the following chemical components in percentage by weight: 0.06-0.11% of C, 0.15-0.35% of Si, 0.95-1.3% of Mn, 0.4-0.6% of Mo, 2.3-2.8% of Ni, 0.5-1.0% of Cr, 1.0-2.0% of Cu, less than and equal to 0.05% of Nb, less than and equal to 0.08% of V, greater than and equal to 0.02% of Al, less than and equal to 0.025% of P, less than and equal to 0.010% of S and the balance of Fe, wherein yield strength is 785-820 MPa, tensile strength is 870-925 MPa, and low-temperature impact powerat (-)40 DEG C is 140-220 MPa. The preparation method comprises the following steps of: roughly milling and finely milling forged steel billets in an austenite re-crystallization region and an austenite a non-recrystallization region to obtain a hot-rolled steel plate; and performing QLT two-step critical thermal treatment on air-cooled steel, wherein a quenching temperature is 850 DEG C, a critical annealing temperature is 680 DEG C, a critical tempering temperature is 620 DEG C and heat-preservation time is 60 minutes. The copper-containing low-carbon high-strength high-ductility steel is reasonable in component design, and is simple and easy in process control; and the obtained steel has ultrahigh strength and good low-temperature toughness.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a copper-containing low-carbon high-strength high-toughness steel for offshore platforms and a preparation method thereof. Background technique [0002] In recent years, as the proportion of offshore oil and gas resources in global oil and gas resources has gradually increased, countries around the world have taken the development of offshore oil and gas resources and the development of offshore oil and gas extraction equipment as the focus of national energy development strategies. Among many offshore oil and gas exploration equipment, the jack-up drilling platform has become an important equipment for offshore exploration due to its advantages of flexible operation, less steel consumption, low construction cost, good mobility and good operability. As the key structure to control the lifting of the offshore platform, the legs of the offshore platform have been in harsh enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/42C22C38/06C22C38/48C22C38/46C21D8/02
CPCC22C38/02C21D8/0205C21D8/0226C21D8/0247C21D2211/008C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48
Inventor 陈礼清习小慧王金亮马明玉魏亮亮王昭东
Owner NORTHEASTERN UNIV
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