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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 T

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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[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: the steel billet is smelted and cast into a slab, heated at 1150~1250℃ for 70~90min, then hot rolled into a 3~5mm thick hot rolled steel plate, and then cold rolled to 1~ 1.5mm, the cold rolling reduction ratio is 65-75%, and the ferrite + pearlite structure is obtained; among them, the finishing temperature of hot rolling is 750-850℃, and the coiling temperature is 650-700℃;

[0031] b. Q&P process: The cold-rolled sheet obtained in step a is first heated to austenitizing temperature of 900-920°C at 10°C / s, held for 600s, and then cooled to room temperature at 50°C / s; then at 10°C / s s Reheat it to the annealing temperature of 760-850℃, keep it for 600s, then reduce the temperature at 50℃ / s to the distribution temperature of 150-450℃, keep it for 50-200s, and f...

Example Embodiment

[0038] Example 1

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

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

[0041]

[0042] According to the composition percentage of each component of the niobium alloyed TAM steel in Table 1, the 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:

[0043] Table 2 Specific process parameters of 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 percentage of each component of the niobium alloyed TAM steel in Table 1, the mechanical rolling process in Table 2, and the Q&P process in Table 3, the mech...

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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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