Titanium alloyed TAM steel and manufacturing method thereof

A technology of titanium alloy and chemical composition, which is applied in the field of titanium alloyed TAM steel and its manufacturing process, can solve the problems that cannot meet the requirements, and achieve the goal of improving comprehensive mechanical properties, stable steel structure and performance, and excellent resistance to hydrogen-induced delayed fracture performance Effect

Active Publication Date: 2015-11-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • 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 titanium, 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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  • Titanium alloyed TAM steel and manufacturing method thereof
  • Titanium alloyed TAM steel and manufacturing method thereof
  • Titanium alloyed TAM steel and manufacturing method thereof

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preparation example Construction

[0029] The preparation method of titanium alloyed TAM steel, which 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,...

Embodiment 1

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

[0040] Table 1 Composition percentage of titanium 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 titanium 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 titanium alloyed TAM steel in Table 1 and the mechanical rolling process in Table 2 and the Q&P process in Table 3, the mec...

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Abstract

The invention relates to titanium alloyed TAM steel and a manufacturing method thereof and belongs to the technical field of design and thermal processing of metal ingredients. The titanium alloyed TAM steel disclosed by the invention comprises the following chemical ingredients in weight percentage: 0.18-0.21 percent of C, 1.48-1.55 percent of Si, 1.90-2.20 percent of Mn, smaller than or equal to 0.020 percent of P, smaller than or equal to 0.015 percent of S, 0.04-0.06 percent of Ti, smaller than or equal to 0.04 percent of Al and the balance Fe and inevitable impurities. According to the titanium alloyed TAM steel disclosed by the invention, a suitable amount of titanium is added in a titanium alloying way; the toughness of the TAM steel is improved by precipitation of carbides and the like of titanium, so that the comprehensive mechanical properties of the titanium-containing TAM steel are improved, and a steel plate is enabled to have relatively high strength and plasticity and is especially excellent in hydrogen induced delay cracking resistance. The titanium-containing TAM steel disclosed by the invention is produced by adopting a novel process, i.e., a Q and P process, so that steel tissues are more stable in performance.

Description

technical field [0001] The invention relates to a titanium alloyed 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 of AHSS (Ad Tianced High Strength Steels) steel, Q&P (Quenching and Par TiTioning) 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 th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
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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