Mo-containing hot-rolled complex-phase steel with tensile strength of 650 MPa and production method thereof
A technology of tensile strength and production method, which is applied in the field of hot-rolled composite phase steel, can solve the problems of inability to meet the needs of complex forming of automobile chassis structural parts and high yield strength, and achieve the reduction of inclusion level, low yield strength ratio and mechanical strength. good performance
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Embodiment 1
[0076] The chemical composition and mass percentage of a Mo-containing hot-rolled multiphase steel with a tensile strength of 650 MPa in this example are shown in Example 1 in Table 1.
[0077] The production method of a kind of Mo-containing tensile strength 650MPa grade hot-rolled composite phase steel of the present embodiment comprises the following steps:
[0078] S1, molten iron pretreatment;
[0079] S2, converter smelting;
[0080] S3, LF furnace refining;
[0081] S4, RH vacuum degassing;
[0082] S5. Continuous casting, pouring at a stable speed within ± 3mm of mold steel fluctuation control, and dynamic reduction treatment, using electromagnetic stirring to make impurities float up to obtain good internal quality of the slab.
[0083] S6. The slab is sent into the heating furnace for heating, and the slab is heated in the heating furnace for 2.5 hours. The temperature of the slab exiting the heating furnace is controlled at 1200-1250°C, effectively controlling th...
Embodiment 2
[0092] The chemical composition and mass percentage of a Mo-containing hot-rolled multiphase steel with a tensile strength of 650 MPa in this example are shown in Example 2 in Table 1.
[0093] The production method of a kind of Mo-containing tensile strength 650MPa class hot-rolled composite phase steel of this embodiment is the same as the production method of embodiment 1, and its main process parameters are shown in Table 2, and finally obtained is hot-rolled composite phase steel The structure is a mixed structure composed of ferrite, pearlite and granular bainite, and its related performance parameters and carbon equivalent are shown in Table 3.
Embodiment 3
[0095] The chemical composition and mass percentage of a Mo-containing hot-rolled multiphase steel with a tensile strength of 650 MPa in this example are shown in Example 3 in Table 1.
[0096] The production method of a kind of Mo-containing tensile strength 650MPa class hot-rolled composite phase steel of this embodiment is the same as the production method of embodiment 1, and its main process parameters are shown in Table 2, and finally obtained is hot-rolled composite phase steel The structure is a mixed structure composed of ferrite, pearlite and granular bainite, and its related performance parameters and carbon equivalent are shown in Table 3.
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Abstract
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