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R4 grade steel for mooring chain and its preparation method

A technology for mooring chains and tons of steel, which is applied in the field of steel for R4 mooring chains and its preparation. It can solve the problems of high overall alloy composition, internal cracks in materials, and affecting welding performance, so as to reduce the amount of inclusions and reduce the production cost. Cost, the effect of improving the yield of the alloy

Inactive Publication Date: 2015-12-30
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, practice has proved that this technology has the following problems: the carbon equivalent is high, which affects the welding performance; the cost of electric furnace preparation is higher than that of converter; Otherwise, the material will undergo structural transformation during placement, resulting in structural stress, resulting in internal cracks in the material

Method used

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  • R4 grade steel for mooring chain and its preparation method
  • R4 grade steel for mooring chain and its preparation method
  • R4 grade steel for mooring chain and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare a steel for mooring chains of R4 grade with a diameter of 120mm. The chemical composition of molten steel is calculated by weight percentage: C: 0.165%, Si: 0.193%, Mn: 1.29%, P: 0.020%, S: 0.015% , Cu: 0.02%, Cr: 0.95%, Ni: 0.87%, Mo: 0.33%, Al: 0.037%, As: 0.0040%, Sb: 0.0035%, Sn: 0.0028%, N: 0.0032%, O: 0.0016% , H: 0.0013%;

[0026] Its preparation method includes the steps of molten iron desulfurization, converter smelting, argon blowing, LF furnace refining, RH furnace vacuum treatment, continuous casting, billet heating, rolling, air cooling, and non-destructive testing, wherein:

[0027] When the molten iron is desulfurized, the magnesium powder desulfurization process is adopted to control the sulfur content S of the molten iron leaving the station to 0.010%, and the desulfurization slag in the tank must be cleaned;

[0028] During converter smelting, the amount of steel scrap loaded accounts for 10% of the total amount loaded; the converter adopts to...

Embodiment 2

[0039] Prepare a steel for mooring chains of R4 grade with a diameter of 105mm. The chemical composition of molten steel is calculated by weight percentage: C: 0.191%, Si: 0.25%, Mn: 1.27%, P: 0.013%, S: 0.012% , Cu: 0.012%, Cr: 0.89%, Ni: 0.83%, Mo: 0.29%, Al: 0.037%, As: 0.0036%, Sb: 0.0022%, Sn: 0.0034%, N: 0.0027%, O: 0.0011% , H: 0.0009%.

[0040] The preparation method includes the steps of molten iron desulfurization, converter smelting, argon blowing, LF furnace refining, RH furnace vacuum treatment, continuous casting, billet heating, rolling, air cooling, and nondestructive testing, wherein:

[0041] When the molten iron is desulfurized, the magnesium powder desulfurization process is adopted to control the sulfur content S of the molten iron leaving the station to 0.010%, and the desulfurization slag in the tank must be cleaned;

[0042] During converter smelting, the amount of steel scrap loaded accounts for 15% of the total amount loaded; the converter adopts top...

Embodiment 3

[0053] Prepare a steel for R4 grade mooring chains with a diameter of 125mm. The chemical composition of molten steel is calculated by weight percentage: C: 0.20%, Si: 0.25%, Mn: 1.35%, P: 0.025%, S: 0.025% , Cu: 0.02%, Cr: 1.23%, Ni: 1.09%, Mo: 0.290%, Al: 0.35%, As: 0.0027%, Sb: 0.0015%, Sn: 0.0031%, N: 0.0023%, O: 0.0012% , H: 0.0014%.

[0054] The preparation method includes the steps of molten iron desulfurization, converter smelting, argon blowing, LF furnace refining, RH furnace vacuum treatment, continuous casting, billet heating, rolling, air cooling, and nondestructive testing, wherein:

[0055] When the molten iron is desulfurized, the magnesium powder desulfurization process is adopted to control the sulfur content S of the molten iron leaving the station to 0.009%, and the desulfurization slag in the tank must be cleaned;

[0056] During converter smelting, the amount of steel scrap loaded accounts for 12% of the total amount loaded; the converter adopts top-bott...

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Abstract

The invention discloses a steel for R4-grade mooring cables and a preparation method thereof. The steel comprises the following components in percentage by weight: 0.15-0.24% of C, 0.15-0.30% of Si, 1.2-1.60% of Mn, at most 0.025% of P, at most 0.025% of S, at most 0.02% of Cu, 0.8-1.3% of Cr, 0.70-1.30% of Ni, 0.2-0.50% of Mo, 0.02-0.05% of Al, at most 0.0050% of As, at most 0.0050% of Sb, at most 0.0050% of Sn, at most 0.0050% of N, at most 0.0020% of O, at most 0.0020% of H, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: molten iron desulfurization, converter smelting, argon blowing, LF (ladle furnace) refining, RH vacuum treatment, continuous casting, square billet heating, rolling, air cooling and nondestructive flaw detection. The steel for R4-grade mooring cables has the advantages of high strength, high toughness, low cost and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel, and specifically refers to a steel for R4 grade mooring chains and a preparation method thereof. Background technique [0002] Mooring chain products are mainly used in floating preparation systems for offshore oil development, semi-submersible drilling platforms, single-point mooring structures, floating preparation and storage vessels and other marine development facilities. In recent years, with the in-depth development of marine resources opening , especially marine oil extraction, marine exploration, national defense construction and other marine facilities need to use a large number of mooring chains. Due to the harsh operating environment of the ocean, especially the deep sea, and the large-scale of marine facilities, more and more requirements are put forward for the comprehensive performance of the steel used for mooring chains. For demanding requirements, not only high strength,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C22C38/58C22C38/44C22C33/06C21C7/10B21B37/74
Inventor 徐志东周新龙龙莉范植金吴杰徐志李婷张帆
Owner 武汉钢铁有限公司
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