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Thin steel plate with excellent workability and forming precision and producing process thereof

A thin steel, high-strength technology, applied in the field of high-strength cold-rolled thin steel and high-strength galvanized thin steel, can solve the problems of unsatisfactory formability and low r value of thin steel

Inactive Publication Date: 2006-09-27
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this thin steel sheet has a low r-value and, therefore, is not completely satisfactory in terms of formability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In this example, steels having the chemical composition shown in Table 1 were melted in a laboratory, and slabs having a thickness of 80 mm were produced.

[0056] The obtained slabs were hot rolled under the conditions shown in Table 2 to a thickness of 3 mm. Rough rolling during hot rolling consisted of four rolling passes with an interval of at least 5 seconds between passes, to a thickness of 30 mm, simulating the method of manufacturing bar blanks. Finish rolling is performed by performing rolling in three passes with an interval of at most 5 seconds between each pass to manufacture a hot-rolled steel sheet. For some embodiments, the bar blank is induction heated for up to 60 seconds in order to make the temperature at the entry side of the finish rolling higher than the temperature at the exit side of the rough rolling. After finishing rolling, cooling is carried out by water jets to reach the temperature corresponding to coiling, the thin steel plate is placed i...

Embodiment 2

[0076] Using the steel compositions shown in Table 6, Example 1 was repeated.

[0077] In this example, after heating to 860°C, at 45g / m 2 The amount of zinc-coated cold-rolled steel sheet. After galvanizing, diffusion annealing (alloying) of the coating is performed. Tensile properties and BH were evaluated for the obtained steel sheets. Performance was also evaluated for accelerated aging at 50°C for 3 days.

[0078] The results are shown in Table 7.

[0079] steel

[0080] try

[0081] As can be seen from the above, the high-strength galvanized steel sheet according to the present invention has improved workability, that is, press-formability, and excellent shape retention and impact resistance that do not exist in the prior art. Therefore, it is possible to reduce the thickness of body panels and other parts used for the exterior of automobiles, thereby significantly reducing cost and weight.

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PUM

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Abstract

The steel for the high strength thin plate contains: C lower than 0.04 wt%, Si lower than 0.4 wt%, Mn 0.5-3.0 wt%, P lower than 0.15 wt%, S lower than 0.03 wt%, Al lower than 0.50 wt%, N lower than 0.01 wt% and Mo 0.01-1.0 wt%. The steel has metal structure with residual austenite of 0.5-10 vol% except the composite hard phase structure with at least one of ferrite, bainite and martensite. The thin plate of the said steel is suitable for use as outer car body. In addition, the present invention also relates to high-strength galvanized sheet steel and its making process.

Description

technical field [0001] The present invention relates to high-strength cold-rolled steel sheets and high-strength galvanized steel sheets, which are suitable for parts such as automobile body outer panels, which require good appearance, good workability and good forming accuracy, that is, shape retention . The invention also relates to a steel for producing such a thin steel plate and a method for producing such a thin steel plate. Background technique [0002] Automobile body panels and other exterior parts of automobiles are required to have excellent appearance and excellent strength in terms of, for example, impact resistance. The main cause of such blemishes in appearance of the outer body panels is surface strain due to elastic recovery after stamping. Therefore, materials with low yield strength are suitable for such body panels. However, if the yield strength of the outer body panel after molding is too low, the impact resistance of the outer body panel is poor, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/04
Inventor 野村茂树中川浩行中泽嘉明
Owner NIPPON STEEL CORP
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