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Vanadium-contained TAM steel and manufacturing method thereof

A technology of weight percentage and chemical composition, applied in the field of vanadium-containing TAM steel and its manufacturing process, can solve problems such as inability to meet requirements, and achieve the effects of improving comprehensive mechanical properties, high strength and plasticity, and stable steel structure and properties

Inactive Publication Date: 2015-11-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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AI Technical Summary

Problems solved by technology

[0005] Most of the research on TRIP steel in the prior art uses ordinary steel without adding vanadium, and the process only uses traditional technology. The comprehensive mechanical properties of the TRIP steel prepared by it, such as strength and plasticity, especially its resistance to hydrogen-induced delayed fracture, Neither can meet the requirements of the third generation of automotive steel

Method used

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  • Vanadium-contained TAM steel and manufacturing method thereof
  • Vanadium-contained TAM steel and manufacturing method thereof
  • Vanadium-contained TAM steel and manufacturing method thereof

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preparation example Construction

[0029] The preparation method of vanadium-containing TAM steel comprises the following steps:

[0030] a. Mechanical rolling process: Smelting and casting steel billets into slabs, heating at 1150-1250°C for 70-90 minutes, then hot-rolling them into 3-5mm thick hot-rolled steel plates, and then cold-rolling them to 1- 1.5mm, the cold rolling reduction rate is 65-75%, and the ferrite + pearlite structure is obtained; among them, the hot rolling finishing temperature is 750-850°C, and the coiling temperature is 650-700°C;

[0031]b. Q&P process: heat the cold-rolled sheet obtained in step a to the austenitizing temperature of 900-920°C at 10°C / s, keep it warm for 600s, then cool it down to room temperature at 50°C / s; then heat it at 10°C / s s Reheat to annealing temperature of 760-850°C, hold for 600s, then cool down to partition temperature of 150-450°C at 50°C / s, hold for 50-200s, and finally cool down to room temperature at 50°C / s.

[0032] Further, as a more preferred techni...

Embodiment 1

[0039] The composition percentage of each component of vanadium-containing TAM steel of the present invention is shown in Table 1 with reference to:

[0040] Table 1 Composition percentage of vanadium-containing TAM steel

[0041]

[0042]

[0043] According to the composition percentages of vanadium-containing TAM steel in Table 1, traditional mechanical rolling process smelting, hot rolling, cold rolling and new process Q&P process are carried out. The specific process parameters of the traditional mechanical rolling process are shown in Table 2:

[0044] Table 2 The specific process parameters of the mechanical rolling process

[0045]

[0046] The specific process parameters of the new process Q&P process are shown in Table 3:

[0047] Table 3 Q&P process specific process parameters

[0048]

[0049] According to the composition percentages of the vanadium-containing TAM steel in Table 1 and the mechanical rolling process in Table 2 and the Q&P process in Tab...

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Abstract

The invention relates to vanadium-contained TAM steel and a manufacturing method thereof, and belongs to the technical field of metal composition design and heat machining. The vanadium-contained TAM steel comprises, by weight percentage, 0.18%-0.21% of C, 1.48%-1.55% of Si, 1.90%-2.20% of Mn, not larger than 0.020% of P, not larger than 0.015% of S, 0.04%-0.06% of V, not larger than 0.04% of Al and the balanced Fe and inevitable impurities. An appropriate amount of vanadium is added in a vanadium alloying manner, the obdurability of the TAM steel is improved through precipitation of carbide of the vanadium and the like, and the comprehensive mechanical property of the vanadium-contained TAM steel is improved; and a steel plate has the higher strength and the higher plasticity, and the vanadium-contained TAM steel particularly has the excellent hydrogen-embrittlement-resistant delay breakage performance. A new technology, namely a Q&P process, is adopted in production of the vanadium-contained TAM steel, and therefore the steel structure property is more stable.

Description

technical field [0001] The invention relates to a vanadium-containing TAM steel and a manufacturing process thereof, belonging to the technical field of metal composition design and thermal processing. Background technique [0002] TAM steel, also known as TRIP type annealed martensitic steel (TRIP-aided Annealed Martensite Matrix), is a kind of Q&P steel. As the third-generation AHSS (Advanced High Strength Steels) steel, Q&P (Quenching and Partitioning) steel for automobiles has natural advantages and has achieved a good match between strength and plasticity. Laboratory data shows that the strength of Q&P steel for automobiles is above 1000 MPa, and the elongation reaches 18 % or more, fully capable of meeting the requirements of bumpers (anti-collision beams), side anti-collision beams (W-type) and other components. The biggest feature of TAM steel is that it breaks through the polygonal ferrite matrix or bainite matrix structure of traditional TRIP steel, and uses the a...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C33/04
Inventor 蔡晓文杨雄飞唐静杨小琴
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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