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V-Ti controlled composite bainite non-quenched and tempered steel structure and manufacturing method thereof

A technology of non-quenched and tempered steel and production method, which is applied in the field of high-strength and toughness non-quenched and tempered steel manufacturing, can solve the problems of high hydrogen embrittlement sensitivity, insufficient cooling rate control, and affect safe service, etc., to optimize hydrogen embrittlement sensitivity, low cost effect

Active Publication Date: 2021-03-19
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of controlling the cooling rate after forging faces the risk of insufficient control of the cooling rate
[0004] In addition to further improving the strength and toughness, the bainitic non-quenched and tempered steel has a high susceptibility to hydrogen embrittlement after the strength is increased, especially after it is increased to 1000MPa, which affects its safe service in the service environment

Method used

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  • V-Ti controlled composite bainite non-quenched and tempered steel structure and manufacturing method thereof
  • V-Ti controlled composite bainite non-quenched and tempered steel structure and manufacturing method thereof
  • V-Ti controlled composite bainite non-quenched and tempered steel structure and manufacturing method thereof

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Effect test

Embodiment 1

[0035]In order to overcome the strength of non-tuning steel, the production process is complex, the cost is high, and the object of the present invention is to provide a control of V-Ti composite bainite non-tuning steel tissue and performance processes. There is no expensive molybdenum Mo, boron B element, and by controlling different deformations to obtain different topography bainite tissue: granular gerite, slab bellis, forging, after direct air cooling, save complex cooling Speed ​​control, and optimal hydrogen-brittle resistance is obtained by suitable heat treatment processes, for applicable performance.

[0036]Mechanical properties of the material were mainly controlled by the precipitation of microalloying elements such as V, Ti, Nb. The present invention has obtained good mechanical properties by controlling the V-Ti content and the appropriate forging process. The embodiment of the present invention provides control V-Ti composite bainite non-tuning steel tissue, according ...

Embodiment 2

[0043]The chemical composition of V-Ti bainite non-tuning steel is shown in Table 1.

[0044]Table 1V-Ti complexesite non-conditioned steel chemical composition (wt%)

[0045] ingredient CSi Mn PSCrVTi AlN content 0.230.452.030.0080.0440.550.140.0450.0290.006

[0046]The blank of the above ingredient was placed in a vacuum induction furnace, and the steel ingot was heated to 1200 ° C after the heating furnace was heated. After the heat preservation was 1 h, the forged growth was 12, the forging ratio was 12, the final forging temperature was 850 ° C, afterging Empty cooling to room temperature, the base is a fire forging steel. Fig. 1 (a) is a light micrograph showing a fire forged steel tissue according to the present invention, and FIG. 1 (b) is a scanning electron microscope showing the first fire forged steel tissue, and the mechanical properties are shown in Table 2.

[0047]The above-mentioned fire bob steel is heated to 1100 ° C in an intermediate frequency induction heating furnace. ...

Embodiment 3

[0056]The chemical composition of V-Ti bainite non-tuning steel is shown in Table 4.

[0057]Table 4V-Ti complexesite non-conditioned steel chemical composition (wt%)

[0058] ingredient CSi Mn PSCrVTi AlN content 0.250.401.960.0070.0350.500.110.030.0290.008

[0059]The blank of the above ingredient was placed in a vacuum induction furnace, and the steel ingot was heated to 1200 ° C after the heating furnace was heated. After the heat preservation was 1 h, the forged growth was 12, the forging ratio was 12, the final forging temperature was 850 ° C, afterging Empty cooling to room temperature, the base is a fire forging steel. Mechanical properties are shown in Table 5.

[0060]The above-mentioned fire bob steel is heated to 1100 ° C in an intermediate frequency induction heating furnace. After the heat preservation is 0.5h, it is immediately changed, and the change forging process is constant, the forging ratio is 8, the final forging temperature is 860 ° C, the bar is dispersed. Cool to ro...

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Abstract

The invention provides a V-Ti controlled composite bainite non-quenched and tempered steel structure and a manufacturing method thereof. The V-Ti controlled composite bainite non-quenched and temperedsteel structure comprises the compositions of, in percentage by mass, 0.20%-0.25% of C, 0.40%-0.50% of Si, 1.90%-2.10% of Mn, less than or equal to 0.0080% of P, 0.035%-0.055% of S, 0.50%-0.60% of Cr, 0.10%-0.20% of V, 0.030%-0.050% of Ti, 0.015%-0.035% of Al, 0.006%-0.008% of N, less than or equal to 0.001% of O, and the balance iron and impurities. The manufacturing method comprises the following steps that after weighing and burdening are carried out according to the components, and the components are smelted into steel ingots in vacuum; forging is carried out after the steel ingots are heated to 1200 DEG C and heat preservation is carried out 1-2 h, the forging ratio is larger than or equal to 3, the finish forging temperature is 800 DEG C or above, air cooling is carried out after forging, the tensile strength can reach 1100-1420 MPa, the yield strength can reach 710-1040 MPa, and the shrinkage rate can reach 44-55%; and the hydrogen embrittlement sensitivity of the material canbe optimized through tempering at 200-500 DEG C. The bainite non-quenched and tempered steel can solve the problems of low strength and poor toughness of ferrite and pearlite non-quenched and temperedsteel, the hydrogen embrittlement sensitivity of the bainite non-quenched and tempered steel can be optimized after proper tempering treatment, and the bainite non-quenched and tempered steel can canbe used for replacing quenched and tempered steel to produce automobile bumpers and other security components. and the bainite non-quenched and tempered steel has the advantages of environmental protection and low cost.

Description

Technical field[0001]The present invention relates to the field of manufacturing high-strength non-touched steel, and more particularly to control V-Ti composite bainite non-tuning steel tissue and its production methods.Background technique[0002]Bainite tissue has a good toughness match, which is received by researchers at home and abroad. Bainite has also been applied in non-tangible steel sectors. The bainite non-regulating steel in the current report has 25 mNCRSIVB6, 12MN2VBs and 25 mN2CrV (Fas2225), etc., its main tissue form is a granitic bainite, and its tensile strength does not exceed 1000 MPa.[0003]The invention patent CN 101333633B discloses a low carbon shell type NB-V composite microalloyed non-touched steel and its preparation method proposes the strength of the Benten steel steel with Nb-V, and forging At 7 o'clock, the tensile strength can reach 1000 MPa. Invention Patent CN 106636899 discloses a method for producing a 1000MPa-level high-allerable cold rolled Babil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/24C22C38/28C22C38/38C21D1/18C21D6/00C21D8/00C22C33/04
CPCC22C38/02C22C38/002C22C38/06C22C38/001C22C38/38C22C38/24C22C38/28C22C33/04C21D1/18C21D6/002C21D6/005C21D6/008C21D8/005C21D2211/002C21D2211/005C21D2211/009
Inventor 张永健王占花惠卫军赵晓丽
Owner BEIJING JIAOTONG UNIV