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

Method of Improving Elongation of High Surface Grade IF Steel

A technology with elongation and high surface, which is applied in the field of elongation of grade IF steel, can solve the problems of edge warping, rough edge and thin lines on the surface of finished products, and achieve the effect of suppressing edge warping

Active Publication Date: 2016-03-02
SHOUGANG CORPORATION
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing research and production experience have shown that IF steel is prone to defects such as edge warping in the hot rolling process. The main reason is that the temperature drop at the edge of the slab after it leaves the heating furnace is relatively large, and it is easy to cause edge defects during the width reduction stage of the vertical roll. Rough and thin lines, because IF steel is an ultra-low carbon steel, the critical phase transition temperature from austenite to ferrite is relatively high, coupled with the effect of alloying elements such as Ti, the fine edge defects formed in the rough rolling stage are very easy to The rolling stage is enlarged, and defects such as warped skin on the surface of the finished product are finally formed
This defect is extremely sensitive to the furnace temperature, vertical roll width reduction system, etc., which greatly limits the production of high surface grade and high elongation IF steel

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
  • Method of Improving Elongation of High Surface Grade IF Steel
  • Method of Improving Elongation of High Surface Grade IF Steel
  • Method of Improving Elongation of High Surface Grade IF Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] High surface grade IF steel is produced through continuous casting of molten steel to obtain slab, heating slab, hot rolling vertical roll widening, hot rolling flat roll thinning and high temperature coiling. In the case of other process conditions being the same, two different slab exit temperatures were used to compare the influence of the exit temperature on the mechanical properties such as elongation of the finished product. The two exit temperatures were 1270°C and 1210°C. The mechanical properties such as elongation of the finished products produced under the two furnace temperatures are shown in Table 1.

[0036] Table 1

[0037]

[0038] It can be seen from the data in Table 1 that using a lower slab temperature can effectively improve the elongation and r value of the finished product. Compared with the high temperature furnace at 1270 °C, the low temperature furnace at 1210 °C can significantly increase the elongation and r value of the finished product,...

Embodiment 2

[0040]The other process steps and process conditions are the same. In the case of 1210°C low temperature, this example compares two coiling temperatures with different heights to illustrate the influence of coiling temperature on the mechanical properties such as elongation of the finished product. The two coil temperatures were 650°C and 750°C. The mechanical properties such as elongation of the finished products produced under the two coiling temperatures are shown in Table 2.

[0041] Table 2

[0042]

[0043] It can be seen from the data in Table 2 that increasing the coiling temperature can effectively improve the elongation and r value of the finished product. In the case of 1210°C low temperature coiling, the elongation can be increased from 46.9% at 650°C coiling to 48.9%, the r value is increased from 2.88 to 3.03, and the yield strength and tensile strength are slightly higher than 750°C. There is a decline, but it will not affect the performance of the finished...

Embodiment 3

[0045] see figure 2 , lowering the furnace temperature will increase the temperature drop of the edge while increasing the elongation of the finished product, which will easily lead to the occurrence of defects in the hot curling edge. In order to improve the edge quality of the slab when the slab is released from the furnace at low temperature, the water supply system of the vertical roll is optimized under the condition that the process steps and other process parameters remain unchanged, and the vertical roll water supply mode of the normal water supply in the rolling gap and the reduced water supply mode during rolling are adopted. system, the flow of cooling water in the vertical rolling process will be changed from the previous 60m 3 / h reduced to 25~30m 3 / h, while the cooling water flow in the rolling gap is maintained at 60m 3 / h is constant, and the final surface morphology of the hot coil is as follows image 3 shown. From figure 2 and image 3 It can be see...

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
elongationaaaaaaaaaa
elongationaaaaaaaaaa
Login to View More

Abstract

A provided method for improving the elongation rate of high-surface-grade IF steel (Interstitial-Free Steel) comprises the following control key points: (1) controlling the slab discharging temperature to be 1200 + / - 20 DEG C; (2) employing a high temperature of 730-750 DEG C for reeling; (3) employing a manner of intermittent normal water supply and reducing water supply modes during steel rolling as a vertical-roll water supply system at a rough rolling stage, so as to reduce temperature reduction of strip steel edge parts; (4) optimizing vertical-roll path width-reduction-amount distribution at the rough rolling stage, employing a first, a third and a fifth paths for width reduction, wherein the width reduction amount of the first, the third and the fifth paths is 15-10 mm, 10-5 mm and 5-0 mm; and (5) performing chamfering processing on the slab. The advantages comprise that the method is simple, economic and efficient, conventional equipment can be used for improving the elongation rate of zinc-plated IF steel under the conditions of not influencing steel grade compositions and other performances, and also good surface quality of a steel plate is kept.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, in particular to a method for improving the elongation of high surface grade IF steel. Background technique [0002] Interstitial-free steel (IF steel, full name Interstitial-FreeSteel) is the third-generation deep-drawing steel plate, which has the characteristics of high plastic strain ratio, high work hardening index and no aging. It is the steel plate with the highest stamping level at present and is widely used. In the automobile manufacturing, home appliance and other industries. In recent years, with the rapid development of the automobile and home appliance industries, the demand for IF steel with high-grade surface and excellent mechanical properties has become increasingly prominent. [0003] Interstitial atoms are captured by adding strong C and N compound-forming elements such as Ti and Nb in IF steel to form precipitates (second phase particles). The type, size, and distributi...

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 Patents(China)
IPC IPC(8): B21C37/02B21B37/00B21B37/74
CPCB21B37/56B21B37/74
Inventor 王林于洋张栋王畅焦会立陈瑾惠亚军刘李斌李飞李树森
Owner SHOUGANG CORPORATION
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