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Producing method of thermoforming martensitic steel parts

A martensitic steel, hot forming technology, applied in the direction of forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems of large internal stress of parts quenching, easy stamping damage, low elongation of steel plates, etc.

Inactive Publication Date: 2010-06-09
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, unlike the traditional method of using cold molds, the invention effectively controls the cooling speed of the steel plate by controlling the temperature of the mold, and solves the problem of rapid plasticity of the steel plate caused by the rapid cooling of the steel plate due to the fast cooling speed of the steel plate. drop, easy stamping damage, and the problem of high quenching internal stress of the parts and low elongation of the steel plate caused by too fast cooling and low end cooling temperature

Method used

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  • Producing method of thermoforming martensitic steel parts
  • Producing method of thermoforming martensitic steel parts
  • Producing method of thermoforming martensitic steel parts

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Embodiment Construction

[0009] Embodiment 1-2#, and contrasting steel are mining converter+refining+continuous casting+hot continuous rolling process production; 3# are electric furnace+refining+die casting+medium plate rolling+cold rolling production; 4# are vacuum induction Furnace + electroslag remelting + forging + plate rolling + cold rolling production, the specific composition is shown in Table 1. The heat treatment process and mold temperature of the steel are shown in Table 2. The mechanical properties of the steel are shown in Table 3.

[0010] Table 1 Chemical Composition of Steel

[0011] furnace number

C

Si

mn

Ni

Cr

P

S

[N]

[O]

B

Ti

1

0.20

0.85

1.15

-

-

0.008

0.005

0.004

0.0015

0.0031

0.15

2

0.28

1.85

1.05

-

1.03

0.012

0.003

0.003

0.0018

-

-

3

0.40

1.20

0.25

1.02

0.95

...

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Abstract

The invention provides a high security, high accuracy and thermal forming martensite steel part preparing method, which belongs to the field of obtaining controlling and cooling technology of the hotstamping forming part of the alloy steel plate, the martensite works as the matrix structure of the alloy steel plate. The method adopts the processes as follows: a steel plate is heated to 20 to 250DEG C above the Ac3 temperature, therefore an austenite structure can be obtained, then the steel plate is transferred to the stamping die for forming by stamping; simultaneously, the temperature of the stamping die is controlled in a range of 100 to 400 DEG C, 5 to 60 seconds later after stamping forming, the formed component parts can be taken out of the stamping die. The method has the advantages that a well ductility and security can be obtained, and the anti-susceptibility of the steel can be greatly enhanced.

Description

technical field [0001] The invention belongs to the field of controlled cooling technology for hot stamping forming parts of alloy steel plates with martensite as the matrix structure, and in particular provides a preparation method for hot forming martensitic steel parts, which is suitable for hot stamping of thin thickness steel plates and A part with a tensile strength of 1.3GPa-2.2GPa martensitic structure is obtained. Background technique [0002] With the improvement of automobile lightweight and safety requirements, the steel used for automobile structural parts is required to have ultra-high strength. The strength levels of traditional ferritic steel, pearlitic steel and bainite steel are all lower than 1.2GPa, so only ultra-high strength martensitic steel can meet the requirements. Usually, martensitic steel is obtained by quenching and tempering heat treatment after processing and forming. For thin thickness parts, quenching deformation is very serious. However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02B21D37/16C22C38/58C22C38/54B21C23/00
Inventor 董瀚时捷王毛球惠卫军
Owner CENT IRON & STEEL RES INST
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