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
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[0039] Example 1 The principle that the Ce-rich and Si-rich oxide layers change the surface structure of hot formed steel.
[0040] The chemical composition design of traditional hot forming steel 22MnB5 is adopted. Hot stamping forming steel is heated and then austenite stamped and quenched. Therefore, it adopts high carbon composition design. The composition of traditional hot forming steel 22MnB5: 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 unavoidable inclusions.
[0041] There is no oxide layer on the surface of normal hot forming steel material. During continuous annealing production, after bright annealing, a 100% pure iron surface is obtained; the pickling plate is delivered, and the pickling process after hot rolling is used to remove the surface oxide layer to obtain a material with a pure iron structure. During the use of hot forming steel, the blank (...
Example Embodiment
[0043] Example 2.
[0044] 1. The chemical composition and dosage composition screening experiment of the hot-pressed steel sheet of the present invention.
[0045] Hot forming process: hot forming material blanking → heating → hot stamping → quenching → laser cutting → finished product.
[0046] In the hot stamping forming process of the Ce alloy-added hot stamping steel, 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 to 5 minutes to achieve austenitization, which meets the requirements of the hot press forming process.
[0048] Step 2. After the material is transferred, the stamping and clamping temperature is greater than 750°C.
[0049] Step 3. After closing the mold, the pressure is maintained and the mold opening temperature is less than 200°C.
[0050] The test steel was prepared according to the different composition of the hot stamping steel in Table 1, and the performance of the prepa...
Example Embodiment
[0058] Example 3 A method for preparing Ce alloy-added steel for hot stamping.
[0059] The Ce alloy-added steel for hot stamping forming of the present invention is prepared according to the following preparation method.
[0060] 1. Steelmaking.
[0061] 1. Smelting and refining.
[0062] The molten iron is pretreated, using converter steelmaking, out-of-furnace refining technology, and continuous casting processes, and finally a continuous casting billet with qualified composition that meets the design requirements is obtained. Among them, the ladle Al is controlled at 0.01 to 0.015%. At the end of refining, when the oxygen content is sufficiently low, the Ce-rich cored wire is added through the wire feeder (the Ce metal, Ce-Fe alloy and other Ce-rich raw materials can also be added in powder, block, etc.).
[0063] 2. Continuous casting process.
[0064] Protective pouring is carried out throughout the entire process to ensure that no molten steel is exposed during the pouring proce...
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