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

Steel sheet for deep drawing having excellent secondary work embrittlement resistance, fatigue properties and plating properties, and method for manufacturing the same

A technology of secondary processing and fatigue resistance, which is applied in the manufacture of steel plates and the field of deep-drawing steel plates, can solve the problems of inability to ensure secondary processing embrittlement resistance and fatigue resistance, and achieve good resistance to secondary processing embrittlement The effect of chemical resistance and good formability

Active Publication Date: 2008-07-09
浦项股份有限公司
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this method can enhance workability by controlling the combination of Ti and Nb, it cannot ensure secondary work embrittlement resistance and fatigue resistance required for automotive steel sheets in recent years

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

Embodiment 1

[0072] After the steel sheet blank having the composition shown in Table 1 was reheated to 1,180°C, the steel sheet blank was hot-rolled by finish rolling at a temperature of 910°C, and coiled at a temperature of 650°C. The coiled steel sheet was subjected to cold rolling and continuous annealing under the conditions shown in Table 2. Then, the mechanical properties of the cold-rolled steel sheet were evaluated, and the results are shown in Table 2. At this time, the ductile brittle transition temperature (DBTT) obtained in the following manner was used to evaluate the secondary processing embrittlement of each steel plate: a cup was formed with a process ratio of 1.9, and the cup was placed horizontally, and the lead The hammer falls on the cup. The fatigue resistance was evaluated under the following conditions: When a total of 10 million loads were repeatedly applied to the spot welded specimen with a 60 Hz cycle, the specimen was not damaged. The anti-chalking performance is e...

Embodiment 2

[0082] After reheating the steel sheet blanks having the composition of the steels 1 and 5 of the present invention shown in Table 1 to 1,180°C, the steel sheet blanks were hot-rolled by finishing rolling at a temperature of 910°C, and at a temperature of 650°C Perform winding. At this time, when hot rolling is performed, the ratio of the reduction in rough rolling to the reduction in finish rolling is based on the conditions shown in Table 3. The coiled steel sheet was subjected to cold rolling and continuous annealing under the conditions shown in Table 2 (the conditions of the steels 1 and 5 of the present invention).

[0083] Then, the mechanical properties and distribution of the precipitate of the sample were evaluated, and the results are shown in Table 3.

[0084] table 3

[0085]

Example

No.

steel

No.

Reduction

Proportion

r-value

Anti-chalking performance

Sedimentary

Average size

(nm)

Ti 4 C 2 S 2 ...

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

A steel sheet for deep drawing used for automobiles, and a method for manufacturing the same are disclosed. The steel sheet comprises, by weight%, C: 0.010% or less, Si: 0.02% or less, Mn: 0.06-1.5%, P: 0.15% or less, S: 0.020% or less, Sol. Al: 0.10-0.40%, N: 0.010% or less, Ti: 0.003-0.010%, Nb: 0.003-0.040%, B: 0.0002-0.0020%, and the balance of Fe and other unavoidable impurities, wherein the composition of Ti, Al, B, and N satisfies the relationship: 1.0 < (Ti[%]+Al[%] / 16+6B[%]) / 3.43N[%] < 4.1, and wherein the composition of Nb, Al, and C satisfies the relationship: 0.7 < (Nb[%]+Al[%] / 20) / 7.75C[%] < 3.5. The steel sheet exhibits excellent secondary work embrittlement, fatigue properties of welded joints, and an appealing plated surface as well as excellent formability.

Description

Technical field [0001] The present invention is based on Korean Application No. 2005-61691 filed on July 8, 2005, and claims the priority of this application, which is incorporated herein by reference in its entirety. [0002] The present invention relates to steel plates for deep drawing mainly used for interior or exterior panels of automobile bodies. More specifically, the present invention relates to a steel sheet for deep drawing, which has a tensile strength of 28-50□f / □, while showing excellent resistance to secondary processing embrittlement, fatigue resistance of welded joints, and For plating performance and excellent formability, the present invention also relates to a method for manufacturing the steel sheet. Background technique [0003] In recent years, as automobile body parts have a tendency to become more complicated in shape and integrated into a single part, steel sheets for automobile bodies are required to have further enhanced formability. In addition, steel...

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): C22C38/00
CPCC22C38/02C21D8/0221C21D8/0226C21D8/0236C21D8/0421C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 康熙宰陈光根韩箱浩崔昌植
Owner 浦项股份有限公司