Unlock instant, AI-driven research and patent intelligence for your innovation.

Micro-alloy-treated hot-rolled H-shaped steel and rolling method thereof

A technology of micro-alloying and H-shaped steel, which is applied in the field of section steel rolling, can solve the problems of difficulty in adapting to marine engineering, insufficient impact resistance and tensile strength, etc., and achieve the goal of increasing strength, improving shaping and toughness, and enhancing impact resistance. Effect

Active Publication Date: 2020-06-30
HEBEI JINXI IRON & STEEL GRP CO LTD
View PDF10 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a micro-alloyed hot-rolled H-shaped steel and rolling method 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

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
  • Micro-alloy-treated hot-rolled H-shaped steel and rolling method thereof

Examples

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 ...

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
Yield strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Charpy impact energyaaaaaaaaaa
Login to View More

Abstract

The invention provides micro-alloy-treated hot-rolled H-shaped steel and a rolling method, and relates to the technical field of section steel rolling. The rolling method comprises the steps of hot metal pretreatment, converter smelting, refining, continuous casting, rolling, cooling and straightening, wherein in the step of the hot metal pretreatment, the temperature of hot metal is larger than or equal to 1300 DEG C; in the step of converter smelting, in the steel tapping process, pre-melting refining slag is added; and in the step of rolling, temperature waiting cooling and speed reductiontreatment are adopted. According to the micro-alloy-treated hot-rolled H-shaped steel, micro-alloy elements such as V and Nb are added in the smelting process so that structural grains of the sectionsteel can be effectively refined, the strength of the section steel is improved, the plasticity and the toughness of the section steel are further improved, and the impact resistance of the section steel is ensured; and meanwhile, the optimization of the procedure in hot rolling is combined, the effective refinement of the structural grains of the section steel is improved, the tensile strength, the yield strength and the elongation of the section steel are further improved, and the impact resistance of the section steel is enhanced.

Description

technical field [0001] The invention belongs to the technical field of section steel rolling, and more specifically relates to a microalloy-treated hot-rolled H-section steel and a rolling method of the micro-alloy-treated 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 tradi...

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): C22C38/02C22C38/04C22C38/12C22C38/14B21B1/088B21B45/00C22C33/04
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