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Niobium alloying TAM steel and preparing method thereof

A technology of niobium alloying and chemical composition, which is applied in the field of metal composition design and thermal processing, can solve problems such as unsatisfactory requirements, and achieve the effects of improving comprehensive mechanical properties, promoting sustainable development of the national economy, and improving strength and toughness

Active Publication Date: 2015-11-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the research on TRIP steel in the prior art uses ordinary steel without adding niobium, 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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  • Niobium alloying TAM steel and preparing method thereof
  • Niobium alloying TAM steel and preparing method thereof
  • Niobium alloying TAM steel and preparing method thereof

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preparation example Construction

[0029] The preparation method of niobium alloyed TAM steel specifically includes traditional mechanical rolling process smelting, hot rolling, cold rolling and new process Q&P process:

[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 fin...

Embodiment 1

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

[0040] Table 1 Composition percentage of niobium alloyed TAM steel

[0041]

[0042] The traditional mechanical rolling process smelting, hot rolling, cold rolling and new process Q&P process are carried out according to the composition percentages of the various components of the niobium alloyed TAM steel in Table 1. The specific process parameters of the traditional mechanical rolling process are shown in Table 2:

[0043] Table 2 The specific process parameters of the mechanical rolling process

[0044]

[0045] The specific process parameters of the new process Q&P process are shown in Table 3:

[0046] Table 3 Q&P process specific process parameters

[0047]

[0048] According to the composition percentages of the niobium alloyed TAM steel in Table 1 and the mechanical rolling process in Table 2 and the Q&P proce...

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Abstract

The invention relates to niobium alloying TAM steel and a preparing method thereof, and belongs to the technical field of metal component designing and thermal machining. The niobium alloying TAM steel comprises, by weight percentage, 0.18-0.21% of C, 1.48-1.55% of Si, 1.90-2.20% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.015% of S, 0.04-0.06% of Nb, smaller than or equal to 0.04% of Al, and the balance Fe and other inevitable impurities. An appropriate amount of niobium is added in a niobium alloying manner, the toughness of the TAM steel is improved through precipitation of carbide of niobium and the like, and therefore the comprehensive mechanical performance of the niobium-containing TAM steel is improved, and a steel plate has high strength and plasticity and especially has the superior hydrogen resisting and induced delaying fracture performance. According to the production of the niobium-containing TAM steel, the steel organization performance is more stable through the new technology-Q&P technology.

Description

technical field [0001] The invention relates to a niobium alloyed TAM steel and a manufacturing process thereof, and belongs 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 ann...

Claims

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Application Information

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IPC IPC(8): C22C38/12C21D8/02
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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