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Hot stamping forming steel added with Ce alloy and hot stamping forming technology

A technology of hot stamping forming and alloy, which is applied in the field of hot stamping forming steel and hot stamping forming technology, to achieve the effect of solving the problem of mold wear, stable and compact structure, and eliminating the need for shot blasting

Active Publication Date: 2020-11-13
LIAONING INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hot stamping forming steel with the addition of Ce alloy provided by the present invention forms a special oxidized product that does not fall off during the heating process, which solves the production problem of hot pressing forming parts in the prior art

Method used

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  • Hot stamping forming steel added with Ce alloy and hot stamping forming technology
  • Hot stamping forming steel added with Ce alloy and hot stamping forming technology
  • Hot stamping forming steel added with Ce alloy and hot stamping forming technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 The principle of Ce-rich and Si-rich oxide layers changing the surface structure of hot-formed steel.

[0040] It adopts the chemical composition design of traditional hot forming steel 22MnB5. Hot stamping forming steel adopts heating, austenitic stamping and quenching, therefore, adopts high carbon composition design, traditional hot forming steel 22MnB5 composition: C 0.20~0.25%, Mn 0.1~1.5%, Si less than 0.8%, Cr less than 0.5% , Al is less than 0.5%, Ti is less than 0.1%, B is not less than 0.001%, and the balance is Fe and inevitable inclusions.

[0041] There is no oxide layer on the surface of normal hot-formed steel raw materials. During the continuous annealing production, the surface of 100% pure iron is obtained after bright annealing; the pickling plate is delivered, and the pickling process after hot rolling is adopted to remove the surface oxide layer to obtain a material with a surface of pure iron structure. During the use of hot-formed stee...

Embodiment 2

[0044] 1. Screening experiments on the chemical composition and dosage of the hot-pressed steel sheet of the present invention.

[0045] Thermoforming process: thermoforming material blanking → heating → hot stamping → quenching → laser cutting → finished product.

[0046] The hot stamping forming process of the steel for hot stamping forming with the addition of Ce alloy, the hot stamping forming process includes the following steps.

[0047] Step 1. The heating temperature is 920-950° C., and the holding time is 3-5 minutes to achieve austenitization, which meets the requirements of the hot-press forming process.

[0048] Step 2. After the sheet is transferred, the stamping mold clamping temperature is higher than 750°C.

[0049] Step 3. After closing the mold, pressurize and cool normally, and the mold opening temperature is less than 200°C.

[0050] The test steel was prepared according to the different compositions of the hot stamping steel in Table 1, and the performan...

Embodiment 3

[0058] Example 3 A method for preparing a steel for hot stamping with the addition of a Ce alloy.

[0059] The preparation of the Ce alloy-added steel for hot stamping of the present invention is carried out according to the following preparation method.

[0060] 1. Steelmaking.

[0061] 1. Smelting and refining.

[0062] After the molten iron is pretreated, converter steelmaking, out-of-furnace refining technology, and continuous casting process are adopted, and finally a continuous casting slab with qualified composition meeting the design requirements is obtained. Among them, ladle Al is controlled at 0.01-0.015%. At the end of refining, when the oxygen content is guaranteed to be low enough, add Ce-rich cored wire through the wire feeder (it can also be added by adding Ce metal, Ce-Fe alloy and other Ce-rich raw materials in the form of powder, block, etc.).

[0063] 2. Continuous casting process.

[0064] Protective pouring is carried out throughout the pouring proces...

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Abstract

The invention belongs to the technical field of steel preparation and particularly relates to hot stamping forming steel added with Ce alloy and a hot stamping forming technology. The hot stamping forming steel added with Ce alloy comprises the following chemical compositions in percentage by mass: 0.22-0.40% of C, 1.0-2.5% of Mn, 1.2-2.0% of Si, 0.05-0.5% of Al, 1.2-2.5% of Cr, less than 0.6% ofMo, less than 0.1% of Nb, less than 0.15% of V, 0-0.1% of Ti, 0-0.01% of B, 0.01-0.03% of P, less than 0.004% of O, less than 0.002% of S, 0.03-0.08% of Ce, less than 0.01% of Ca, less than 0.01% of Mg and the balance of Fe and unavoidable impurities. The hot stamping forming steel adopts brand new composition design and a conventional production process for production and hot stamping. Through changing the thickness and structure of oxidized scale during the heating and stamping process of hot forming steel, the problem about falling of the hot forming steel during the heating and stamping process is solved, and finally, a thin oxide layer with a stable and dense structure is formed on the surface of a stamping component, so that the problem that a die is worn because the oxide layer of the hot stamping steel falls off is solved, at the same time, shot blasting treatment is also avoided, and the hot stamping forming steel has the direct coating application condition and does not pollute the environment.

Description

technical field [0001] The invention belongs to the technical field of steel preparation, and in particular relates to a hot stamping forming steel added with a Ce alloy and a hot stamping forming process. Background technique [0002] As the society continues to pay attention to energy saving and emission reduction, automobile lightweight design is one of the core technologies to realize energy saving and emission reduction in the automobile industry. Higher strength materials are used to replace low strength materials. , to achieve weight reduction of parts, has become a hot topic in the research of steel materials for automobiles. The hot press forming technology is to form the hot press forming steel after heating and quenching in the mold. It has the characteristics of high strength and high dimensional accuracy of the parts. It can prepare parts with arbitrary complex shapes and has been widely used. The amount of thermoforming of some European models has already acco...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/34C22C38/38C21D1/26C21D6/00C21D8/02B21D22/02
CPCB21D22/022C21D1/26C21D6/002C21D6/005C21D6/008C21D8/0221C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/34C22C38/38
Inventor 刘艳超刘承军岳莹莹李晓亮
Owner LIAONING INST OF SCI & TECH
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