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700 Mpa-level austenite ferrite dual-phase low-density cast steel and preparation method thereof

An austenitic ferrite, low-density technology, which is applied in casting molding equipment, molds, mold components, etc., can solve the problems of limited application scope of lightweight automobiles, unsuitable for large-scale promotion and application, and complex material properties. , to achieve good application prospects, high strength and plasticity, and the effects of a wide range of sources

Active Publication Date: 2019-12-20
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] From the perspective of material selection, there are currently two ways to reduce the weight of automobiles: one is to use lightweight materials, such as low-density aluminum and aluminum alloys, magnesium and magnesium alloys, engineering plastics, etc. The reason for the low strength severely limits its application in automotive stress and load-bearing parts
The second is to use ultra-high-strength steel instead of traditional steel, and reduce the thickness of the steel plate to reduce the weight of the vehicle body. However, high-strength steel plates are prone to springback after forming, and the amount of springback is much greater than that of traditional low-carbon steel plates, and the material properties are more complicated and difficult to control.
The lightweight cast steel is added with more precious elements such as nickel, molybdenum, chromium and rare earth, resulting in high preparation cost, which is not suitable for large-scale promotion and application, and the scope of application in automobile lightweight is limited

Method used

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  • 700 Mpa-level austenite ferrite dual-phase low-density cast steel and preparation method thereof
  • 700 Mpa-level austenite ferrite dual-phase low-density cast steel and preparation method thereof

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preparation example Construction

[0027] The present invention also provides a preparation method of 700MPa-grade austenitic-ferritic dual-phase low-density cast steel, the method comprising the following steps:

[0028] a. Ingredients: use high-purity iron, electrolytic manganese, ferrosilicon, ferro-titanium, ferro-vanadium, ferro-niobium, aluminum particles, and carburizers as raw materials, and make ingredients according to the above ratio; the carburizers are artificial graphite, natural graphite or Any one of coke;

[0029] b. Molding: Use sodium silicate sand for molding, and blow carbon dioxide to harden the sand mold, then paint the inner wall of the sand mold, dry it, and wait for pouring;

[0030] c. Smelting: After adding high-purity iron into the medium-frequency induction furnace, the temperature is raised to above 1300°C. After the high-purity iron is completely melted, electrolytic manganese, ferrosilicon, ferro-titanium, ferro-vanadium, ferro-niobium, aluminum particles, and recarburizer are add...

Embodiment 1

[0041] Ingredients: Calculate the mass of each material according to the mass percentages of target components C: 0.82%, Mn: 18%, Si: 0.2%, V: 0.08%, Ti: 0.11%, Al: 12%, and Nb: 0.12%. Large pieces of charge such as high-purity iron are weighed with a 100kg electronic scale, and charges with a small amount of carburant, ferroniobium, and ferrovanadium are weighed with a 200g electronic scale. Dry processing, each furnace batching 100kg.

[0042] Table 1 Master alloy material list (unit wt%)

[0043] mn Si Ti V Nb C S P Al High purity iron 0.04 0.012 0 0 0 0.003 0.005 0.004 0 Electrolytic manganese 99.58 0.015 0 0 0 0 0.100 0.010 0 Ferrosilicon 0 72.10 0 0 0 0.100 0.016 0.034 1.50 Titanium Sponge 0 0.06 99.3 0 0 0 0.010 0.050 0 Ferrovanadium 0.29 1.76 0 49.35 0 0.330 0.001 0.045 0.50 Ferroniobium 0 2.81 0 0 65.50 0.100 0.060 0.190 0.42 Aluminum particles 0 0 0 0 ...

Embodiment 2

[0052] Calculate the mass of each material (high-purity iron, electrolytic manganese , ferrosilicon, titanium sponge, ferrovanadium, ferroniobium, aluminum particles, recarburizer). The batching, molding, smelting and pouring methods are as shown in Example 1, the difference is: in the heat treatment step, the casting is solid solutioned at 1000°C for 2 hours, cooled to room temperature with water, then aged at 500°C for 6.5 hours, and air cooled to room temperature. The austenitic-ferritic dual-phase low-density cast steel with the composition shown in Example 2 in Table 3 was obtained.

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Abstract

The invention belongs to the technical field of metal materials and metallurgy, and particularly relates to 700 Mpa-level austenite ferrite dual-phase low-density cast steel and a preparation method thereof. The technical problem to be solved by the invention is to provide 700 Mpa-level austenite ferrite dual-phase low-density cast steel. The cast steel comprises the following chemical componentsin percentage by mass: 0.01-1.0% of C, 0.1-0.2% of Si, 10.0-25.0% of Mn, 10.0-15.0% of Al, 0.01-1.0% of V, 0.01-1.0% of Nb, 0.01-1.0% of Ti, less than or equal to 0.01% of S, less than or equal to 0.02% of P, and the balance Fe and inevitable impurities; meanwhile, the weight percentage of Mn and Al satisfies the condition that the weight percentage of Mn plus Al is greater than or equal to 25% and less than or equal to 35%; and the weight percentage of Nb, V and Ti satisfies the condition that the weight percentage of Nb plus V plus Ti is greater than or equal to 0.05% and less than or equalto 0.5%. The cast steel has good mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, and in particular relates to 700MPa-grade austenite-ferrite dual-phase low-density cast steel and a preparation method thereof. Background technique [0002] From the perspective of material selection, there are currently two ways to reduce the weight of automobiles: one is to use lightweight materials, such as low-density aluminum and aluminum alloys, magnesium and magnesium alloys, engineering plastics, etc. The reason for the low strength severely limits its application in automotive stress and load-bearing parts. The second is to use ultra-high-strength steel instead of traditional steel, and reduce the thickness of the steel plate to reduce the weight of the vehicle body. However, high-strength steel plates are prone to springback after forming, and the amount of springback is much greater than that of traditional low-carbon steel plates. The material properties are mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/06B22C9/02C21D6/00
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/06B22C9/02C21D6/008C21D6/005C21D2211/001C21D2211/005
Inventor 王英虎
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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