Production of cold rolling high-strength ultra-deep-drawing steel plate by bell-type furnace and method for manufacturing same

A manufacturing method and high-strength technology, applied in bell-type furnaces, metal rolling, manufacturing tools, etc., can solve problems such as high energy consumption, poor control, and easy-to-break belts, and achieve low investment and high secondary resistance The effect of processing brittleness

Inactive Publication Date: 2008-03-05
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The investment of the continuous annealing production line is relatively high;
[0008] 2. A high annealing temperature is required, about 840°C, which consumes more energy, and the high annealing f

Method used

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  • Production of cold rolling high-strength ultra-deep-drawing steel plate by bell-type furnace and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] Examples are shown in Table 3. After smelting, the slab is heated to 1230°C for 1 hour, finished rolling at 910°C and coiled at 700°C, rolled to 0.8mm with a cold rolling reduction rate of 80%, and heated to 710 with the furnace. After being kept at ℃ for 4 hours, the furnace is cooled, and the steel plate is processed in accordance with JIS13# and its mechanical properties are tested. The ductile-brittle transition temperature DBTT is carried out in accordance with the GM9920P standard.

[0049] Table 3 Chemical composition (wt%)

[0050] Example

[0051] Table 4 Mechanical properties

[0052]

[0053] Table 4 shows the mechanical properties of the example steel treated by the above process. It can be seen from the table that using the composition and process of the present invention, a bell furnace can produce ultra-deep-drawing high-strength cold-rolled steel sheets with excellent comprehensive properties.

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Abstract

The process of producing cold rolled high strength extra-deep drawing steel sheet in a bell type furnace includes the following steps: 1. smelting and casting steel billet with chemical composition comprising C not more than 0.006 wt%, Si not more than 0.30 wt%, Mn 0.15-1.40 wt%, P not more than 0.08 wt%, S not more than 0.02 wt%, N 0.001-0.005 wt%, Al 0.03-0.06 wt%, B 0.0003-0.002 wt%, Ti 0.005-0.015 wt%, Nb 0-0.03 wt%, and Fe and inevitable impurity for the rest; 2. heating to 1100-1250 and rolling; 3. cold rolling in the reduction rate over 73 %; 4. annealing inside a hydrogen or nitrogen-hydrogen bell type furnace at 690-730 deg.c and 5. leveling after annealing. The steel sheet has strength up to 390 MPa, high elongation and r value, high ability of resisting rework brittleness, and ductile-brittle transition temperature lower than -40 deg.c.

Description

technical field [0001] The invention relates to a cold-rolled high-strength ultra-deep-drawn steel plate and a manufacturing method thereof, in particular to a cold-rolled high-strength ultra-deep-drawn steel plate produced by a bell annealing furnace and a manufacturing method thereof. Background technique [0002] The use of high-strength steel plates is a major development trend of modern automotive steel. Generally speaking, as the strength of the steel plate increases, the stamping performance decreases. It is the common wish of the automobile and steel industries to develop a steel plate with both high strength and good stamping performance. On the basis of ultra-low carbon interstitial atom-free steel (IF), by adding solid solution strengthening elements such as P, Mn and Si, a steel plate with both high strength and good stamping performance can be obtained. [0003] High-strength IF cold-rolled steel plate is a high-strength steel plate widely used in automobile bo...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02C21D11/00C21D9/663B21B37/00B21B37/74
Inventor 王利郑建忠王淼戴学诚
Owner BAOSHAN IRON & STEEL CO LTD
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