Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Hot-roll dual-phase steel, and production method for preventing squashed roll of the hot-roll dual-phase steel

A technology of hot-rolled dual-phase steel and manufacturing method, applied in metal rolling, manufacturing tools, metal rolling, etc., to achieve the effect of optimizing the finishing rolling process, high yield strength and yield strength ratio, and excellent comprehensive mechanical properties

Active Publication Date: 2016-08-31
BENGANG STEEL PLATES
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main purpose of this method is to improve the problem of flat coils of hot-rolled dual-phase steel, and reduce the uncoiling caused by flat coils during production, resulting in unusable steel coils and unnecessary economic losses.

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
  • Hot-roll dual-phase steel, and production method for preventing squashed roll of the hot-roll dual-phase steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A hot-rolled dual-phase steel, composed of ferrite (F) and martensite, the mass percent of its chemical composition is: C: 0.07%, Mn: 1.64%, Si: 0.42%, P: 0.013%, S : 0.003%, Als: 0.029%, Nb: 0.021%, and the balance is iron and unavoidable impurities.

[0029] A method for preventing the hot-rolled dual-phase steel flat coil, comprising the steps of:

[0030] Hot metal pretreatment→converter smelting→furnace refining (LF)→wide slab continuous casting (CC)→2300mm unit hot continuous rolling (controlled rolling and controlled cooling)→coiling→inspection→packing for delivery;

[0031] The hot rolling process steps of the 2300mm unit include:

[0032] (1) The steel billet is heated to 1220°C by a regenerative heating furnace, and the time in the furnace is 165min, and a heat preservation cover is used;

[0033] (2) carrying out high-pressure water coarse dephosphorization to the steel billet after described step (1) heating;

[0034] (3) Carry out the width reduction of ...

Embodiment 2

[0042] A hot-rolled dual-phase steel, composed of ferrite (F) and martensite, the mass percent of its chemical composition is: C: 0.09%, Mn: 1.66%, Si: 0.42%, P: 0.012%, S : 0.004%, Als: 0.022%, Nb: 0.023%, and the balance is iron and unavoidable impurities.

[0043] A method for preventing the hot-rolled dual-phase steel flat coil, comprising the steps of:

[0044] The difference from Example 1 is:

[0045] In the step (1), the steel billet is heated to 1260°C through a regenerative heating furnace, and the time in the furnace is 240min, and a heat preservation cover is used;

[0046] The starting temperature of the rough rolling unit in the step (4) is 1180° C.;

[0047] In the step (9), after the steel strip leaves the finishing mill, the first group of laminar water cooling is turned on, and after cooling to 685°C, air cooling is performed for 7-9s, and then the second section of laminar cooling water is turned on to cool to 530°C for coiling.

Embodiment 3

[0049] A hot-rolled dual-phase steel, composed of ferrite (F) and martensite, the mass percent of its chemical composition is: C: 0.08%, Mn: 1.63%, Si: 0.47%, P: 0.015%, S : 0.003%, Als: 0.031%, Nb: 0.030%, and the balance is iron and unavoidable impurities.

[0050] A method for preventing the hot-rolled dual-phase steel flat coil, comprising the steps of:

[0051] The difference from Example 1 is:

[0052] In the step (1), the steel billet is heated to 1240°C through a regenerative heating furnace, and the time in the furnace is 200min, and a heat preservation cover is used;

[0053] The starting temperature of the rough rolling unit in the step (4) is 1160° C.;

[0054] In the step (7), the finish rolling inlet temperature is 960°C, and the finish rolling exit temperature is 850°C;

[0055] In the step (9), after the steel strip leaves the finishing mill, the first group of laminar water cooling is turned on, and after cooling to 680°C, air cooling is carried out for 6-1...

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

No PUM Login to View More

Abstract

Hot-roll dual-phase steel and a production method for preventing squashed roll of the hot-roll dual-phase steel. The invention mainly solves a problem of the squashed roll during production of the hot-roll dual-phase steel in the prior art. The hot-roll dual-phase steel is composed of a ferrite and a martensite and includes the chemical components comprising, by mass, 0.05-0.10% of C, 1.40-1.70% of Mn, 0.35-0.60% of Si, not more than 0.03% of P, not more than 0.01% of S, 0.015-0.07% of Al, 0.01-0.04% of Nb, and the balanced being iron and unavoidable impurities. The invention also provides a production method for preventing the squashed roll of the hot-roll dual-phase steel. The method includes the steps of: pretreatment of molten iron, converter smelting, external refining, wide slab continuous casting, hot continuous rolling in a 2300 mm machine set, steel plate reeling, inspection, and packaging and delivery. The production method has low cost, can effectively solve the problem of squashed roll of the hot-roll dual-phase steel, and reduces unnecessary economic loss since a steel plate coil cannot be uncoiled on a machine due to the problem of squashed roll and the steel coil cannot be used.

Description

technical field [0001] The invention relates to a hot-rolled dual-phase steel and a method for manufacturing the hot-rolled dual-phase steel flat coil, belonging to the technical field of hot-rolled dual-phase steel manufacturing. Background technique [0002] Dual-phase steel refers to low-carbon steel or low-carbon alloy steel obtained through critical zone heat treatment or controlled rolling process. It is an advanced high-strength steel mainly composed of ferrite (F) + a small amount of martensite (M). Ordinary High-strength steel refines the grains through controlled rolling and strengthens the matrix through the precipitation of carbonitrides of microalloying elements, while dual-phase steels have harder horses dispersed in pure ferrite grain boundaries or within grains. Tensile phase, so its strength and toughness have been well coordinated. [0003] Hot-rolled dual-phase steel is mainly divided into two types: low-temperature coiling type and medium-temperature coi...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12B21B1/46B21B37/74B21B45/02
CPCB21B1/46B21B37/74B21B45/0203C21D2211/005C21D2211/008C22C38/12
Inventor 郭鹏史志勇左远鸿果强刘元博
Owner BENGANG STEEL PLATES
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com