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

Method for improving impact toughness of Ti-containing high-strength steel in thickness larger than or equal to 10mm

An impact toughness, high-strength steel technology is applied in the field of improving the impact toughness of titanium-containing high-strength steels with a thickness of ≥10mm, which can solve the problems of increasing the cost of Ti-strengthened high-strength steel alloys, and achieve the effect of low alloy costs.

Active Publication Date: 2015-01-07
武汉钢铁有限公司
View PDF5 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve impact toughness, people are used to adding Nb, Ni and other elements in steel, which increases the alloy cost of Ti-strengthened high-strength 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 for improving impact toughness of Ti-containing high-strength steel in thickness larger than or equal to 10mm
  • Method for improving impact toughness of Ti-containing high-strength steel in thickness larger than or equal to 10mm
  • Method for improving impact toughness of Ti-containing high-strength steel in thickness larger than or equal to 10mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Its steps:

[0036] 1) Applicable conditions of this method: the composition of Example 1 (S460MC) is shown in Table 1, and the superheat of molten steel is 11.5°C;

[0037] Table 1 Chemical composition of Example 1 (wt%)

[0038] serial number C Si mn P S Ti N als Example 1 0.076 0.025 0.88 0.006 0.0041 0.086 0.0036 0.034

[0039] 2) The slab is heated according to different heating rates: the soaking temperature of the slab is controlled at 1188~1196°C, of ​​which: the heating rate from room temperature to 549.5°C is 11.5°C / s, and the heating rate from 550~949.8°C is 8.3°C / s Carry out heating and heating, from 950 to 1196 ° C at a heating rate of 4.3 ° C / s for heating, soaking for 15 minutes; the total heating time is 165 minutes;

[0040] 3) Rough rolling is carried out, the rolling pass is 5 passes, and the average reduction rate of the first three passes is 17.5%, and the reduction rate of the last two passes is 33% and 31...

Embodiment 2

[0046] Its steps:

[0047]1) Applicable conditions of this method: the composition of Example 2 (S500MC) is shown in Table 2, and the superheat of molten steel is 12°C;

[0048] Table 2 Chemical composition of Example 2 (wt%)

[0049] serial number C Si mn P S Ti N als Example 1 0.065 0.23 0.98 0.010 0.0021 0.116 0.0028 0.039

[0050] 2) The casting slab is heated according to different heating rates: the soaking temperature of the casting slab is controlled at 1203~1209°C, of ​​which: the heating rate from room temperature to 549.8°C is 13.0°C / s, and the heating rate of 550~949.5°C is 8.2°C / s Carry out heating and heating, from 950 to 1209°C at a heating rate of 5.0°C / s; soak for 20 minutes, and the total heating time is 160 minutes;

[0051] 3) Carry out rough rolling, the rolling pass is 5 passes, and the average reduction rate of the first three passes is 20%, and the reduction rate of the last two passes is 32% and 35% respectively...

Embodiment 3

[0057] Its steps:

[0058] 1) Applicable conditions of this method: the composition of Example 3 (S500MC) is shown in Table 3, and the superheat of molten steel is 14°C;

[0059] Table 3 Chemical composition (wt%) of Example 3

[0060] serial number C Si mn P S Ti N als Example 1 0.066 0.25 1.13 0.008 0.0035 0.110 0.0030 0.026

[0061] 2) After smelting and continuous casting into slabs, heat the slabs according to different heating rates: control the soaking temperature of the slabs at 1191~1197°C, of ​​which: the heating rate from room temperature to 549.7°C is 12.6°C / s, 550~949.6 The temperature rise rate is 8.5°C / s, and the temperature rise rate is 4.8°C / s from 950 to 1197°C; the soaking time is 20 minutes, and the total heating time is 158 minutes;

[0062] 3) Carry out rough rolling, the rolling pass is 5 passes, and the average reduction ratio of the first three passes is 23%, and the reduction ratio of the last two passes is 35%...

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
Thicknessaaaaaaaaaa
Yield strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to View More

Abstract

A method for improving the impact toughness of Ti-containing high-strength steel in a thickness larger than or equal to 10mm comprises the following steps: continuously casting and cast blank heating; rough rolling; fine rolling; cooling; rolling for standby, wherein the method is suitable for the following conditions: the Ti content is not lower than 0.06%, the N content is not higher than 0.004%, and Nb and Ni elements are not added to the steel. According to the invention, under the premise of meeting the strength of steel plates with specifications larger than 10mm, the alloy cost is lowered, and the impact power of the Ti-containing reinforced high-strength steel at the temperature of minus 20 DEG C is not lower than 55J.

Description

technical field [0001] The invention relates to a production method of Ti-containing high-strength steel, in particular to a method for improving the impact toughness of Ti-containing high-strength steel with a thickness ≥ 10 mm. Background technique [0002] With the increasing awareness of energy conservation and emission reduction, high-strength steel has been widely used in manufacturing fields such as construction machinery, automobiles, and containers. In recent years, domestic manufacturing enterprises have increasingly favored Ti-strengthened high-strength steel with high cost performance. Using Ti precipitation strengthening, compared with the high-strength steel with Nb and Mo as the main strengthening elements, the alloy cost can be reduced by about 10~30%. [0003] Therefore, in recent years, there have been many studies on Ti-enhanced high-strength steel hot-rolled strips and their manufacturing methods, but they mainly focus on thin-gauge high-strength steel o...

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): C21D8/02B22D11/16
Inventor 梁文刘志勇陶文哲陈吉清王俊霖徐进桥甘晓龙郭斌孔君华周学俊
Owner 武汉钢铁有限公司
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