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High-toughness anti-fatigue nano precipitation enhancing martensite-austenite multiphase steel and preparation method thereof

A technology of Austrian composite phase steel and precipitates, which is applied in the field of high-strength, toughness and anti-fatigue nano-precipitates reinforced Ma-Austrian composite phase steel and its preparation, which can solve the problems of poor strength and toughness and high production cost, and achieve improved toughness and convenient production process , excellent toughness and fatigue life effects

Active Publication Date: 2019-04-12
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a high-strength, toughness and anti-fatigue nano-precipitate reinforced Ma-Australian composite steel and its preparation method, which solves the problem of poor strength and toughness of steel for hydraulic plunger pumps in the prior art, and the production cost higher question

Method used

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  • High-toughness anti-fatigue nano precipitation enhancing martensite-austenite multiphase steel and preparation method thereof
  • High-toughness anti-fatigue nano precipitation enhancing martensite-austenite multiphase steel and preparation method thereof
  • High-toughness anti-fatigue nano precipitation enhancing martensite-austenite multiphase steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0049] On the other hand, the present invention also provides a preparation method of high-strength, toughness and anti-fatigue nano-precipitates reinforced Ma-Australian composite phase steel, comprising the following steps: obtaining steel ingots or The billet is subsequently forged, hot-rolled, and quenched and tempered to obtain the May-Australian composite steel.

[0050] Compared with the prior art, this invention is the beneficial effect of the preparation method of the high-strength, toughness and anti-fatigue nano-precipitates reinforced Ma-Austrian composite steel and the beneficial effect of the high-strength, toughness and anti-fatigue nano-precipitates reinforced Ma-Austrian composite steel They are basically the same and will not be repeated here.

[0051] Specifically, the billets or ingots are opened and put into a heating furnace for heating, the heating temperature is 1150-1220°C, the starting rolling temperature is 1000-1050°C, and the finishing rolling temp...

Embodiment 1

[0055] See Table 1 for the chemical composition (wt%) of this example and Comparative Example 1 (traditional material 4330 model). The manufacturing process of the steel plate in this embodiment: converter smelting, LF refining, RH refining and slab continuous casting; rolling with a rolling mill, the heating temperature is 1200°C, the starting rolling temperature is 1050°C, and the final rolling temperature is 830°C. Quenching and tempering treatment process is: quenching temperature 800°C, oil or water cooling; tempering temperature 600°C, oil or water cooling. In this embodiment, the sensitivity of the material to stress corrosion cracking is judged by the slow tensile stress corrosion test and the Wol test. Table 2 shows the performance test results of this embodiment and Comparative Example 1.

[0056] The chemical composition (wt %) of table 1 embodiment 1 and comparative example 1

[0057] steel number

C

Si

S

P

mn

Cr

Ni

Mo

V

...

Embodiment 2

[0062] See Table 3 for the chemical composition (wt%) of this example and Comparative Example 2 (traditional material 4330 model). The manufacturing process of the steel plate in this embodiment: converter smelting, LF refining, RH refining and slab continuous casting; rolling is carried out by a rolling mill, the heating temperature is 1220°C, the starting rolling temperature is 1030°C, and the final rolling temperature is 850°C. Quenching and tempering treatment process: quenching temperature 850°C, oil or water cooling; tempering temperature 650°C, oil or water cooling. Other test methods are the same as in Example 1. Table 4 shows the performance test results of this embodiment and Comparative Example 2.

[0063] The chemical composition (wt%) of table 3 embodiment 2 and comparative example 2

[0064] steel number

C

Si

S

P

mn

Cr

Ni

Mo

V

Cu

Example 2

0.16

0.097

0.003

0.006

3.64

1.10

1.51

0.42

0...

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Abstract

The invention discloses high-toughness anti-fatigue nano precipitation enhancing martensite-austenite multiphase steel and a preparation method thereof, and belongs to the technical field of alloy steel. The martensite-austenite stainless steel comprises chemical components of, by mass percentage, 0.06-0.20% of C, 0.05 -0.20% of Si, less than or equal to 0.01% of P, less than or equal to 0.01% ofS, 2.50 -5.00% of Mn, less than or equal to 1.00% of Cu, less than or equal to 2.00% of Ni, 0.20-0.50% of Mo, 1.00-1.50% of Cr, 0.10-0.80% of V, and the balance Fe and inevitable impurities. The microstructure structure of the steel comprises tempered martensite, reverted austenite and nano-sized vanadium carbide precipitate attached to the tempered martensite. The preparation method comprises thefollowing steps of smelting and secondary refining to obtain a casting blank in the design range of target components, and forging, hot rolling and thermal refining to obtain the martensite-austenitic multiphase steel. In a martensite-austenite multiphase steel plate, the toughening and anti-fatigue effect of the martensite-austenite and the strengthening effect of a large amount of nano precipitation phase are utilized to achieve high-strength and toughness matching of the steel, and the corrosion resistance of material is greatly improved by combining with the corrosion-resistant alloy design.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and in particular relates to a high-strength toughness anti-fatigue nano-precipitate reinforced Ma-Australian composite phase steel and a preparation method thereof. Background technique [0002] The high-pressure plunger pump is the core component of high-end hydraulic equipment and is called the "heart" of the hydraulic system. The materials used are often required to have the characteristics of high pressure resistance, corrosion resistance, and strong wear resistance. [0003] In the prior art, hydraulic plunger pumps usually use Cr-Ni-Mo alloy structural steel materials. However, the structure of the traditional Cr-Ni-Mo alloy structural steel is tempered sorbite, and the strength and toughness of the material in this structure state cannot meet the requirements of harsh service conditions such as ultra-high pressure, cyclic stress, and strong erosion. Pitting corrosion, or even crack f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/38C22C38/22C22C38/24C22C38/20C22C38/42C22C38/44C22C38/46C22C38/58C21D8/02
CPCC21D8/0226C21D2211/001C21D2211/004C21D2211/008C22C38/02C22C38/20C22C38/22C22C38/24C22C38/38C22C38/42C22C38/44C22C38/46C22C38/58
Inventor 孙新军梁小凯黄涛刘清友贾书君付航汪兵陈小平童帅
Owner CENT IRON & STEEL RES INST
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