High-safe high-precision producing method of thermoforming martensitic steel parts

A martensitic steel, high-precision technology, used in the field of controlled cooling of hot stamping parts, which can solve the problems of low elongation of steel plates, large internal stress of parts during quenching, and easy stamping damage.

Inactive Publication Date: 2008-10-08
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 ra...

Method used

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  • High-safe high-precision producing method of thermoforming martensitic steel parts
  • High-safe high-precision producing method of thermoforming martensitic steel parts

Examples

Experimental program
Comparison scheme
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Embodiment Construction

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

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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 hot stamping 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 250 DEG 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 particularly provides a method for preparing high-safety and high-precision hot forming martensitic steel parts, which is suitable for thin-thickness steel plates Hot stamping type and obtain the parts with tensile strength of 1.3GPa-2.2GPa martensite structure. Background technique [0002] With the improvement of automobile lightweight and safety requirements, the steel for automobile structural parts is required to have ultra-high strength. The strength levels of traditional ferritic steel, pearlite steel and bainite steel are all lower than 1.2GPa, so only ultra-high-strength martensitic steel can meet the requirements. Under normal circumstances, martensitic steel is obtained by quenching and tempering heat treatment after processing and forming. For thin parts, quenching deformation is ve...

Claims

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Application Information

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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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