Novel automobile body structural member die-casting die steel and preparation process thereof

A technology of die-casting mold and preparation process, which is applied in the field of steel materials, can solve the problems of mold cracking, insufficient hardenability, incomplete transformation of coarse bainite and austenite, etc., and achieve the goal of improving wear resistance and optimizing alloy composition design Effect

Inactive Publication Date: 2019-09-17
NINGBO HELI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this type of die steel is used to make large-scale automotive structural die-casting dies, due to insufficient hardenability, it is easy to produce pro-eutectoid ferrite, pro-eutectoid carbide, precipitation of coarse bainite and incomplete austenite. transformation, resulting in cracking during mold use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Shock tower die-casting mold

[0030] (1) Chemical composition

[0031] The weight percent composition of die-casting die steel for new body structural parts is as follows: C: 0.280; Si: 0.200; Mn: 0.200; P: 0.002; S: 0.0008; Cr: 7.5; 0.100; N: 0.005; Ti: 0.050.

[0032] (2) Intermediate frequency smelting process

[0033] It adopts 3000Kg intermediate frequency induction furnace, basic furnace lining, and non-oxidative steelmaking process. A small amount of bottom slag is melted with high power; samples are taken in time after melting and clearing; high-temperature refining, comprehensive deoxidation, 5-10 minutes before tapping to ensure that the composition and temperature are suitable, and the slag is pure white; the final sample is taken 10 minutes after alloying; the sulfur and phosphorus content is actual It is required that P≤0.02, S≤0.0008. Add Al in two times for final deoxidation, 1.5 kg in the furnace before tapping, and 1 kg when tapping one-...

Embodiment 2

[0044] Example 2: Die-casting mold for car door inner panel

[0045] (1) Chemical composition

[0046] The weight percentage composition of die-casting die steel for new body structural parts is as follows: C: 0.320; Si: 0.400; Mn: 0.600; P: 0.002; S: 0.001; Cr: 8.500; 0.300; N: 0.100; Ti: 0.200. .

[0047] (2) Intermediate frequency smelting process

[0048] It adopts 1000Kg medium frequency induction furnace, basic furnace lining, and non-oxidative steelmaking process. A small amount of bottom slag is melted with high power; samples are taken in time after melting and clearing; high-temperature refining, comprehensive deoxidation, 5-10 minutes before tapping to ensure that the composition and temperature are suitable, and the slag is pure white; the final sample is taken 10 minutes after alloying; the content of sulfur and phosphorus is actual It is required that P≤0.02, S≤0.008. Al is added twice for final deoxidation, 0.5 kg in the furnace before tapping, and 0.5 kg w...

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Abstract

The invention provides novel automobile body structural member die-casting die steel and a preparation process thereof. The die steel comprises the following components of, by mass, 0.25%-0.35% of C, 0.20%-0.40% of Si, 0.20%-0.60% of Mn, less than or equal to 0.002% of P, less than or equal to 0.001% of S, 7%-9% of Cr, 2.5%-3.5% of Mo, 0.30%-0.50% of V, 0.40%-0.60% of W, 0.10%-0.30% of Nb, 0.005%-0.10% of N, 0.05%-0.20% of Ti and the balance Fe and inevitable impurities. Therefore, the novel automobile body structural member die-casting die steel has good hardenability, wear resistance and thermal fatigue resistance.

Description

technical field [0001] The invention relates to the technical field of steel materials, in particular to a novel die-casting die steel for vehicle body structural parts and a preparation process thereof. Background technique [0002] Automotive structural parts are components that support and carry the body, and are the basis for the installation of body parts. With the development of automobile lightweight, more and more body structural parts are produced by aluminum-magnesium alloy die-casting. Die-casting molds for body structural parts such as door inner panels, shock absorbing towers, longitudinal beams, instrument panels, and trunks are often relatively large. The weight of a single set of molds often exceeds 40 tons, and the overall size of a single module exceeds 1000mm. At present, the commonly used die casting die steel at home and abroad is a series of steels with a Cr content of 3% represented by Sweden QRO90 and a series of die steels with a Cr content of 5% re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/28C22C33/06C21D1/32C21D1/18C21D8/00B22D17/22
CPCB22D17/2209C21D1/18C21D1/32C21D8/005C21D2211/008C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/28Y02P10/20
Inventor 姚杰王春涛周云海
Owner NINGBO HELI TECH CO LTD
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