700MPa-grade thermal forming axle housing steel and preparation method thereof

A thermoforming and axle housing steel technology, which is applied in the field of steel preparation, can solve the problems that the mechanical properties of axle housing steel cannot be stably controlled, the plate grains are coarsened, and the production efficiency is low, so as to avoid micro-banded structure and excellent The effect of impact toughness

CN112195403AActive Publication Date: 2021-01-08SHOUGANG CORPORATION +1
5 Cites 4 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-01-08

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses 700MPa-grade thermal forming axle housing steel. The 700MPa-grade thermal forming axle housing steel is prepared from the following chemical components in percentage by mass: 0.17%-0.27% of C, 0.30%-0.50% of Si, 1.2%-1.8% of Mn, less than or equal to 0.02% of P, less than or equal to 0.009% of S, less than or equal to 0.1% of Ti, less than or equal to 0.2% of Cr and the balance of Fe and inevitable impurities, wherein the mass fraction of Si and Mn meets the condition that Si / Mn is more than or equal to 0.23 and less than or equal to 0.27. The invention further discloses a preparation method. The preparation method comprises the steps of adopting the chemical components for smelting, continuous casting, heating, rough rolling, finish rolling, curling and machining treatment with the heating temperature of 1180 DEG C-1220 DEG C and the heating time of 150 min-200 min to obtain the 700MPa-grade thermal forming axle housing steel. The mechanical properties before and after heat treatment are excellent, and a plate obtained after heat treatment is free of obvious microscopic banded structures and has excellent impact toughness.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of steel preparation, in particular to a 700MPa grade thermoformed axle housing steel and a preparation method thereof. Background technique

[0002] The axle housing is the structure that mainly supports the load of the vehicle, and its lightweight research is of great significance to the lightweight of the medium and heavy trucks. At present, my country's automobile industry has widely used hot-rolled axle housing steel plates to produce axle housings through hot stamping + welding, replacing cast axle housings with complex manufacturing processes, low production efficiency, and high cost.

[0003] Automobile axle housings have used hot-rolled plate substitutes (such as 610L, Q460, etc.) for mass production, but the substitutes have the problem that the material strength is significantly reduced after hot stamping, which is manifested in the obvious grains of the plates after hot stamping. Coarsening, fin...

Examples

preparation example Construction

[0052] The present invention also provides a preparation method of the 700MPa grade thermoformed axle housing steel, such as Figure 5 Shown, described preparation method comprises:

[0053] S1, using the chemical composition of the 700MPa-grade thermoformed axle housing steel for melting and continuous casting to obtain a slab;

[0054] S2. Heating the slab, rough rolling and finishing rolling to obtain a hot-rolled plate; wherein, the heating temperature is 1180°C-1220°C, and the heating time is 150min-200min;

[0055] S3, cooling and crimping the hot-rolled sheet to obtain a hot-rolled coil;

[0056] S4. Process the hot-rolled coil to obtain 700MPa grade hot-formed axle housing steel.

[0057] The preparation method of the 700MPa grade thermoformed axle housing steel provided by the present invention is based on the following principles:

[0058] The heating temperature of the slab is set at 1180°C to 1220°C, and the heating time is 150min to 200min to ensure the homogen...