Hot rolling martensite steel plate with tensile strength higher than 1000Mpa and its production method

A technology of tensile strength and manufacturing method, which is applied in the field of hot-rolled ultra-high-strength martensitic steel plate and its manufacturing, can solve the problems of low steel plate strength level, increased process cost, high cost, etc., and achieves simple and easy hot-rolled process, The effect of low alloy cost and economical composition

Active Publication Date: 2007-08-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] It can be seen from the above comparative patents that these patents have one or more of the following deficiencies: ① A certain amount of expensive alloying elements, such as Cu, Ni, Cr, Mo, etc., are added, and the cost of steel is high
For example, 1.00-3.50% Ni and 0.40-1.20% Cr are added to JP60121219 and JP 89025371; the nickel content in WO200039352 is not less than 1.0%; the copper content in Japanese patent JP 4176822A is 0.5-2%; ②The process is complicated and the process cost is high
The carbon content in Japanese patent JP 4176822A is ≤0.01%, which belongs to ultra-low carbon steel.

Method used

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  • Hot rolling martensite steel plate with tensile strength higher than 1000Mpa and its production method
  • Hot rolling martensite steel plate with tensile strength higher than 1000Mpa and its production method
  • Hot rolling martensite steel plate with tensile strength higher than 1000Mpa and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0057] The following are specific descriptions of Examples 1-11 of the present invention.

[0058] The concrete chemical composition (Wt%) of example 1-11 sees Table 1:

[0059] Table 1

[0060] make up

[0061] The concrete process parameter of example 1-11 is shown in Table 2:

[0062] Table 2

[0063]

[0064]

[0065] The mechanical properties of examples 1-11 are shown in Table 3.

[0066] table 3

[0067]

[0068] It can be seen from Table 3 that the longitudinal yield strength of 11 examples is greater than 750MPa, the tensile strength is between 1000MPa and 1100MPa, and the elongation is A 80 Greater than or equal to 7%, the vertical and horizontal cold bending d=4t (bend center diameter=4×steel plate thickness) are all qualified, reaching the requirement of tensile strength 1000MPa hot-rolled ultra-high-strength martensitic steel.

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PUM

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Abstract

The invention relates to a hot- roled martensite steel with strength for extension higher than 1000 Mpa, the component (with percent by weight) comprises: C 0.08-0.20, Si<=0.8, Mn 0.5-2.0, Al 0.010-0.060, N<=0.008, P<= 0.020, S<=0.005, one or more than one of Ti 0.01-0.03, V<=0.10 and Nb 0.01-0.05; Ca 0.001%-0.005%, added when sulfur content >=0.003; left is Fe and inavoidable foreigh matter. The main process parameters are as follows: cooling said steel with speed not less than 20 degree/ s to cooling temeprature between 150 Deg. C to Ms, stopping cooling and batching to make metallic band; or cooling with speed not less than 20 degree/ s to 650- 750 Deg. C, setting for 2- 10 seconds, and cooling with speed not less than 50 degree/ s to cooling stop temperature of 150 Deg. C- Ms, and batching to make metallic band.

Description

technical field [0001] The invention relates to a method for manufacturing iron and steel materials, in particular to a hot-rolled ultra-high-strength martensitic steel plate and a method for manufacturing the same. Background technique [0002] There are many varieties of automotive steel. Traditional low-strength steel (LSS) and high-strength steel (HSS) mainly include interstitial-free steel (IF), high-strength interstitial-free steel (IF-HS), ordinary carbon mild steel (MILD), and isotropic steel ( IS), bake-hardening steel (BH), carbon-manganese steel (C-Mn) and low-alloy high-strength steel (HSLA), dual-phase steel (DP), transformation-induced plasticity steel (TRIP) and other three types of parts Low strength grade varieties. With the development of the automobile industry, the requirements for vehicle safety are getting higher and higher, and the weight of vehicles is also required to be lighter and lighter to improve fuel economy. The requirements for the strength...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C38/14C22C38/12C21D11/00C21D1/18
Inventor 张爱文郑磊
Owner BAOSHAN IRON & STEEL CO LTD
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