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Rare earth microalloyed 800MPa-grade hot-rolled round steel for mooring chain and production method of hot-rolled round steel

A technology of micro-alloying and production methods, which is applied in the manufacture of converters, etc., can solve the problems of increasing heat treatment costs, scrapping cracks in materials, and reducing production efficiency, and achieves the goals of reducing preparation costs, low yield ratio, and improving cleanliness Effect

Pending Publication Date: 2022-08-02
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the addition of a large number of alloying elements in the steel, the hot-rolled structure of the material is semi-martensitic. The material must be annealed before delivery, otherwise the material will undergo martensitic transformation during the placement process, resulting in structural stress. Leading to internal cracks in the material and scrapping
This increases heat treatment costs and reduces production efficiency

Method used

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  • Rare earth microalloyed 800MPa-grade hot-rolled round steel for mooring chain and production method of hot-rolled round steel
  • Rare earth microalloyed 800MPa-grade hot-rolled round steel for mooring chain and production method of hot-rolled round steel
  • Rare earth microalloyed 800MPa-grade hot-rolled round steel for mooring chain and production method of hot-rolled round steel

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Embodiment

[0026] Example: This example is a preferred example among the various embodiments of the present invention.

[0027] The rare earth microalloyed 800MPa-grade hot-rolled round steel for mooring chains and the production method thereof in the present embodiment, the mass percentages of its chemical components include: C 0.18%-0.28%, Si 0.15%-0.30%, Mn 1.00% ~1.20%, P≤0.020%, S≤0.020%, Cr 0.80%~1.10%, Mo 0.40%~0.60%, Ni 0.60%~0.80%, Nb0.02%~0.06%, Cu 0.10%~0.20%, Alt 0.020%~0.050%, Re 0.020%~0.030%, the rest are Fe and unavoidable trace impurities, and the total mass fraction is 100%.

[0028] The production method of the rare earth microalloyed 800MPa mooring chain hot-rolled round bar in this embodiment is: converter smelting, LF refining, VD vacuum degassing, continuous casting, casting billet heating furnace heating, and round bar rolling.

[0029] Double blowing converter smelting, the final slag basicity is controlled at 3.0, the end point control target is C ≥ 0.06%, T is...

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Abstract

The invention discloses hot-rolled round steel for a rare earth microalloyed 800MPa-grade mooring chain. The hot-rolled round steel comprises the following chemical components in percentage by mass: 0.18%-0.28% of C, 0.15%-0.30% of Si, 1.00%-1.20% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.80%-1.10% of Cr, 0.40%-0.60% of Mo, 0.60%-0.80% of Ni, 0.02%-0.06% of Nb, 0.10%-0.20% of Cu, 0.020%-0.050% of Alt, 0.020%-0.030% of Re and the balance of Fe and inevitable trace impurities. The invention further discloses a production method. On the premise of reducing the production cost, the hardenability, the corrosion resistance, the fatigue resistance and the low-temperature toughness of the steel for the mooring chain are remarkably improved.

Description

technical field [0001] The invention relates to a rare earth microalloyed 800MPa-grade hot-rolled round steel for mooring chains and a production method thereof. Background technique [0002] With the gradual reduction of land resources, countries around the world are accelerating the development of marine resources. Offshore oil and gas development, especially deep-sea oil and gas development, has become the main field of world energy. Mooring chain mooring is the main way of securing engineering platforms, ships, floating oil storage vessels (FPSOs) and semi-submersible drilling vessels in the marine environment for oil exploration and production. The demand for steel for marine mooring chains is increasing. The mooring chain needs to be immersed in seawater for a long time and is subjected to irregular stress by waves and sea wind, and needs to have a service life of more than 20 years, which puts forward high requirements for the performance of the mooring chain. The s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C22C38/44C22C38/42C22C38/06C22C38/04C22C38/02C21C7/10C21C7/064C21C7/06C21C5/35B22D11/18B22D11/115
CPCC22C38/005C22C38/44C22C38/46C22C38/42C22C38/02C22C38/04C22C38/06C21C5/35C21C7/064C21C7/06C21C7/10B22D11/115B22D11/18
Inventor 惠治国宋振东周彦卜向东赵晓敏张凤明陈镇方
Owner BAOTOU IRON & STEEL GRP