Extra-deep drawing IF steel and annealing process thereof

An annealing process and ultra-deep drawing technology, applied in the field of metallurgy, to achieve the effects of good product performance, less construction investment and low production cost

Inactive Publication Date: 2012-07-18
INNER MONGOLIA BAOTOU STEEL UNION
View PDF2 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional annealing process is based on continuous or bell annealing of cold-rolled coi

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0007] Example 1

[0008] The chemical composition and weight percentage of cold-rolled sheet are: C 0.008%, Si 0.008%, Mn 0.13%, P 0.006%, S 0.005%, Ti 0.055%, Nb 0.019%, Alt 0.03%, the rest is Fe and can not Trace impurities detected. Rolling is carried out according to the cold rolling process in Table 1, and the thickness of the sheet is cold rolled from 1.14mm to 0.47mm.

[0009] Table 1 Cold rolling process

[0010] Thickness mm

[0011] The annealing process is as follows: the intermediate annealing process is: heating rate 6°C / min, annealing temperature 720°C, holding time 48 hours, cooling with the furnace; secondary annealing adopts continuous heating, heating rate 6°C / min, twice The annealing temperature is 700°C, the holding time is 2 hours, and the furnace is cooled to 450°C and air-cooled. The measured values ​​of the mechanical properties of the IF steel samples treated according to the above-mentioned secondary annealing process are shown in Table 2. The cold-ro...

Example Embodiment

[0014] Example 2

[0015] The chemical composition and weight percentage of cold-rolled sheet are: C 0.008%, Si 0.008%, Mn 0.13%, P 0.006%, S 0.005%, Ti 0.055%, Nb 0.019%, Alt 0.03%, the rest is Fe and can not Trace impurities detected. Rolling is carried out according to the cold rolling process in Table 1, and the thickness of the sheet is cold rolled from 1.14mm to 0.47mm.

[0016] The annealing process is as follows: the intermediate annealing process is: heating rate 6°C / min, annealing temperature 720°C, holding time 48 hours, cooling with the furnace; secondary annealing adopts continuous heating, heating rate 6°C / min, twice The annealing temperature is 720°C, the holding time is 2 hours, and the furnace is cooled to 450°C and air-cooled. The measured values ​​of the mechanical properties of the IF steel samples treated according to the above-mentioned secondary annealing process are shown in Table 2. The mechanical properties of the cold-rolled sheet after annealing at 720...

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

Extra-deep drawing IF steel and an annealing process thereof belong to the technical field of metallurgy. The extra-deep drawing IF steel is characterized that the chemical components and the weight percentage content should conform to: C<=0.008%, Si<=0.015%, Mn<=0.15, P<=0.01%, S<=0.005%, Alt>=0.015%, Ti=0.01-0.07%, Nb=0.01-0.02%, and the balance Fe and trace impurities which cannot be detected. In the annealing process, continuous heating is adopted, the heating rate is 4-8 DEG C/min, the intermediate annealing temperature is 700 DEG C to 750 DEG C, the heat-preserving time is 1-50h, and cooling is performed along with a furnace. The second annealing temperature is 700 DEG C to 750 DEG, the heat-preserving time is 1-10h, and cooling is performed along with the furnace to 400 DEG C-450 DEG C, and discharging and air cooling are performed. The IF steel having excellent deep drawing performance can be obtained by the method, an IF steel sample processed by the process has excellent deep drawing performance, the tensile strength is 290-320MPa, the yield strength is 95-145MPa, the elongation is 45-65%, the plastic strain ratio n is not smaller than 0.27, and the plastic strain ratio r is not smaller than 2.0.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to an ultra-deep drawing IF steel and an annealing process. Background technique [0002] IF steel is widely used in all walks of life in the national economy because of its excellent deep drawing performance. The optimization of annealing process is the key to improve the deep drawing properties of IF steel. The traditional annealing process is based on continuous or bell annealing of cold rolled coils, and there are few reports on the secondary annealing process of the annealed steel strip. After the secondary annealing process, the proportion of {111} texture components that are conducive to deep drawing performance increases, and its deep drawing performance is significantly better than that of primary cold-rolled steel strip, which can meet the stamping requirements of automobile and high-end steel users. need. Contents of the invention [0003] The purpose of the present ...

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): C22C38/14C21D1/26C21D9/48
Inventor 高志国程德富康利明张辉王海明冯岩青
Owner INNER MONGOLIA BAOTOU STEEL UNION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap