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The rolling method of micro-alloyed hot-rolled h-beam

A technology of H-shaped steel and micro-alloy, which is applied in the field of steel rolling, and can solve problems such as difficulty in adapting to marine engineering, insufficient impact resistance and tensile strength

Active Publication Date: 2021-08-10
HEBEI JINXI IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a rolling method of micro-alloyed hot-rolled H-shaped steel to solve the technical problem that the existing H-shaped steel has insufficient impact resistance and tensile strength in the prior art and is difficult to adapt to the needs of marine engineering

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  • The rolling method of micro-alloyed hot-rolled h-beam

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The mass percentage of the chemical composition of the H-beam is:

[0032] C: 0.10%; Si: 0.30%; Mn: 1.50%; P: 0.010%; S: 0.005%; Nb: 0.027%;

[0033]The production method of microalloy treatment and controlled rolling of high-strength hot-rolled H-shaped steel sequentially comprises the following steps: molten iron pretreatment; converter smelting; refining; continuous casting; rolling; cooling and straightening.

[0034] Wherein, in the molten iron pretreatment step, the blast furnace molten iron is added with CaO desulfurizer for desulfurization treatment, after stirring, the slag removal operation is carried out. After the slag removal is completed, the exposed area of ​​the molten iron is guaranteed to be 85%, and the mass percentage of the chemical composition of the molten iron reaches: Si: 0.28%; P: 0.10%; S: 0.027%, the rest is Fe and unavoidable impurities. At this time, the temperature of molten iron is 1320°C;

[0035] In the converter smelting step: add si...

Embodiment 2

[0042] The mass percentage of the chemical composition of the H-beam is:

[0043] C: 0.11%; Si: 0.31%; Mn: 1.51%; P: 0.017%; S: 0.007%; Nb: 0.029%;

[0044] The production method of microalloy treatment and controlled rolling of high-strength hot-rolled H-shaped steel sequentially comprises the following steps: molten iron pretreatment; converter smelting; refining; continuous casting; rolling; cooling and straightening.

[0045] Wherein, in the molten iron pretreatment step, the blast furnace molten iron is added with CaO desulfurizer for desulfurization treatment, after stirring, the slag removal operation is carried out. After the slag removal is completed, the exposed area of ​​the molten iron is guaranteed to be 85%, and the mass percentage of the chemical composition of the molten iron reaches: Si: 0.25%; P: 0.11%; S: 0.023%, the rest is Fe and unavoidable impurities. At this time, the temperature of molten iron is 1350°C;

[0046] In the converter smelting step: add s...

Embodiment 3

[0053] The mass percentage of the chemical composition of the H-beam is:

[0054] C: 0.11%; Si: 0.26%; Mn: 1.52%; P: 0.019%; S: 0.004%; Nb: 0.025%;

[0055] The production method of microalloy treatment and controlled rolling of high-strength hot-rolled H-shaped steel sequentially comprises the following steps: molten iron pretreatment; converter smelting; refining; continuous casting; rolling; cooling and straightening.

[0056] Wherein, in the molten iron pretreatment step, the blast furnace molten iron is added with CaO desulfurizer for desulfurization treatment, after stirring, the slag removal operation is carried out. After the slag removal is completed, the exposed area of ​​the molten iron is guaranteed to be 85%, and the mass percentage of the chemical composition of the molten iron reaches: Si: 0.32%; P: 0.125%; S: 0.030%, the rest is Fe and unavoidable impurities. At this time, the temperature of molten iron is 1310°C;

[0057] In the converter smelting step: add ...

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Abstract

The invention provides a rolling method of micro-alloyed hot-rolled H-shaped steel, which relates to the technical field of steel rolling. The rolling method includes the steps of molten iron pretreatment, converter smelting, refining, continuous casting, rolling, cooling and straightening ; Wherein, in the molten iron pretreatment step, the temperature of the molten iron is ≥ 1300 ° C; in the converter smelting step, in the tapping process, adding pre-melted refining slag; The micro-alloyed hot-rolled H-shaped steel provided by the present invention can effectively refine the structure and grain of the shaped steel by adding micro-alloying elements such as V and Nb in the smelting process, which not only improves the strength of the shaped steel, but also improves the plasticity of the shaped steel. shape and toughness, ensuring the impact resistance of the section steel; at the same time, combined with the optimization of the hot rolling process, the effective refinement of the microstructure and grain of the section steel is realized, thereby improving the tensile strength, yield strength and elongation of the section steel , and enhanced the impact resistance of steel.

Description

technical field [0001] The invention belongs to the technical field of section steel rolling, and more specifically relates to a rolling method of micro-alloyed hot-rolled H-section steel. Background technique [0002] With the rapid development of offshore operations such as oil exploration, the amount of steel used in marine engineering steel and ships and other equipment has also increased significantly. The steel used in marine engineering is mainly divided into steel for offshore platforms and steel for marine energy equipment, mainly low-alloy high-performance structural steel. Due to the high safety requirements of the above equipment, the steel used must have the characteristics of high strength, high toughness, fatigue resistance, lamellar tear resistance, good weldability and corrosion resistance. [0003] The H-shaped steel produced by the existing steel processing technology generally adopts the traditional material ratio and ordinary rolling method, and the yie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14B21B1/088B21B45/00C22C33/04
CPCB21B1/088B21B45/004C22C33/04C22C38/02C22C38/04C22C38/12C22C38/14
Inventor 马永福叶高旗韩小强纪广胜马云飞李永锋温小杰吴立红刘海龙
Owner HEBEI JINXI IRON & STEEL GRP CO LTD