Axle housing steel for cold stamping of 590mpa thick specification and preparation method thereof

A thick-gauge, cold-stamping technology, applied in the field of 590MPa thick-gauge cold-stamping axle housing steel and its preparation, can solve the problems of high production cost of high-strength axle housing steel, achieve improved welding performance, good structure uniformity, and reduce carbon equivalent effect

Active Publication Date: 2022-07-22
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the production cost of existing high-strength axle housing steel is relatively high

Method used

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  • Axle housing steel for cold stamping of 590mpa thick specification and preparation method thereof
  • Axle housing steel for cold stamping of 590mpa thick specification and preparation method thereof
  • Axle housing steel for cold stamping of 590mpa thick specification and preparation method thereof

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Embodiment 1-2

[0047] Example 1-2: Smelting to obtain slabs according to the data in Table 1, and processing the slabs, specifically: the heating temperature is 1200-1240°C, and the heating time is 190-400min; The reduction amount is ≥ 19%, the full length of the odd pass is descaled, and the thickness of the intermediate billet is 53-57mm; after 7 passes of finishing rolling, the reduction rates of the last three stands are 18%, 13% and 10%, respectively. Cooling water between 3 stands, finishing rolling temperature ≤1030℃, finishing rolling temperature 830-870℃, coiling temperature 550-590℃; laminar cooling after rolling, using front-end cooling mode, specific process parameters are shown in the table 2 shown.

[0048] Table 2 embodiment 1,2 preparation process parameters

[0049]

[0050] figure 1 It is the typical edge structure in the thickness direction of the axle housing steel for cold stamping with a thickness of 590 MPa prepared in Example 1 of the present invention; figure ...

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Abstract

The invention discloses an axle housing steel for cold stamping with a thickness of 590 MPa and a preparation method thereof, and belongs to the technical field of hot continuous rolling strip production. 590MPa grade axle housing steel for cold stamping, its chemical composition is: C0.07‑0.10%, Si0.05‑0.10%, Mn1.50‑1.60%, P≤0.020%, S≤0.008%, Nb0. 030‑0.040%, V0.07‑0.10%, N0.010‑0.015%, Als 0.015‑0.050%, and the balance is Fe and inevitable impurities. The preparation method is as follows: smelting into slabs according to the chemical composition of the axle housing steel for cold stamping with a thickness of 590 MPa, and sequentially heating the slabs, rough rolling, finishing rolling, coiling and cooling, to obtain a slab for cold stamping with a thickness of 590 MPa. Axle steel. The product of the invention has yield strength ≥460MPa, tensile strength ≥590MPa, elongation after fracture ≥20%, full-size-40°C impact energy KV2 ≥80J, and can effectively solve the problem of high production cost of existing high-strength axle housing steel .

Description

technical field [0001] The invention belongs to the technical field of hot continuous rolling strip production, and relates to an axle housing steel for cold stamping with a thickness of 590 MPa and a preparation method thereof. Background technique [0002] With the development of China's automobile industry, the demand for automobile steel is gradually increasing, and the performance requirements of automobile steel are also getting higher and higher. The axle housing is one of the main components of the automobile chassis system, which is used to support the frame. At the same time, the axle housing is equipped with a reducer, a differential and a transmission device that drives the wheels. Therefore, it needs to have sufficient strength and good stamping performance. and welding performance. Before the manufacture of automobile axle housings, the casting process was mostly used, but the manufacturing process of the cast axle housings is complicated, the production effic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/00C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/001C22C33/04C21D8/005
Inventor 崔凯禹李正荣汪创伟叶晓瑜张开华胡云凤
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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