Unlock instant, AI-driven research and patent intelligence for your innovation.

High-strength high-toughness 25CrNi3MoVE steel, preparation method and application thereof

A high-toughness, high-strength technology, applied in the field of alloy steel, can solve the problems of large inclination of quenching cracks, etc., and achieve the effect of improving strength and toughness, meeting the environmental requirements of high-toughness seawater use, and refining the structure

Active Publication Date: 2020-04-17
NO 719 RES INST CHINA SHIPBUILDING IND
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardenability assembly leads to a large tilt of quench cracking

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-strength high-toughness 25CrNi3MoVE steel, preparation method and application thereof
  • High-strength high-toughness 25CrNi3MoVE steel, preparation method and application thereof
  • High-strength high-toughness 25CrNi3MoVE steel, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The mass percentage of the chemical composition of a high-strength and high-toughness 25CrNi3MoVE steel is shown in Table 3.

[0040] table 3

[0041]

[0042] Impurities: O: 22ppm, N: 78ppm, As: 315ppm, Sn: 210ppm, Sb: 50ppm, Pb: 12ppm, H: 2ppm.

[0043] The preparation method of the high-strength and high-toughness 25CrNi3MoVE steel described in this embodiment is as follows:

[0044] (1) Electric furnace smelting: Using scrap steel and molten iron as raw materials, through oxidation and reduction reactions, high-purity molten steel with low content of P, S and gas elements is obtained.

[0045] (2) Refining outside the LF furnace: After the electric furnace smelting and handing over the package, keep the ladle temperature ≥ 1675°C, and then move to the vacuum position. According to the chemical composition requirements of the steel, corresponding raw materials are added during LF refining, and the content of each component is adjusted to the final composition co...

Embodiment 2

[0065] The mass percentage of the chemical composition of a high-strength and high-toughness 25CrNi3MoVE steel is shown in Table 6.

[0066] Table 6

[0067]

[0068] Impurities: O: 24ppm, N: 100ppm, As: 398ppm, Sn: 300ppm, Sb: 35ppm, Pb: 20ppm, H: 1.8ppm.

[0069] The preparation method of the high-strength and high-toughness 25CrNi3MoVE steel described in this embodiment is as follows:

[0070] (1) Electric furnace smelting: Using scrap steel and molten iron as raw materials, through oxidation and reduction reactions, high-purity molten steel with low content of P, S and gas elements is obtained.

[0071] (2) Refining outside the LF furnace: After the electric furnace smelting and handing over the package, keep the ladle temperature ≥ 1675°C, and then move to the vacuum position. According to the chemical composition requirements of the steel, corresponding raw materials are added during LF refining, and the content of each component is adjusted to the final composition...

Embodiment 3

[0091] The mass percentage of the chemical composition of a high-strength and high-toughness 25CrNi3MoVE steel is shown in Table 9.

[0092] Table 9

[0093]

[0094] Impurities: O: 25ppm, N: 91ppm, As: 400ppm, Sn: 280ppm, Sb: 42ppm, Pb: 17ppm, H: 1ppm.

[0095] The preparation method of the high-strength and high-toughness 25CrNi3MoVE steel described in this embodiment is as follows:

[0096] (1) Electric furnace smelting: Using scrap steel and molten iron as raw materials, through oxidation and reduction reactions, high-purity molten steel with low content of P, S and gas elements is obtained.

[0097] (2) Refining outside the LF furnace: After the electric furnace smelting and handing over the package, keep the ladle temperature ≥ 1675°C, and then move to the vacuum position. According to the chemical composition requirements of the steel, corresponding raw materials are added during LF refining, and the content of each component is adjusted to the final composition co...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
yield strengthaaaaaaaaaa
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of alloy steel, and particularly relates to high-strength high-toughness 25CrNi3MoVE steel, a preparation method and application thereof. The steel comprises the following chemical components in percentage by mass: 0.22-0.28% of C, less than or equal to 0.3% of Si, 0.3-0.6% of Mn, less than or equal to 0.012% of P, less than or equal to 0.006% of S, 0.9-1.2% of Cr, 2.75-3.2% of Ni, 0.2-0.3% of Mo, 0.05-0.15% of V, less than or equal to 0.2% of Cu, less than or equal to 0.03% of Al, less than or equal to 0.01% of Ti, and the balance Fe and inevitableimpurity elements. The steel obtained after smelting, refining, pouring, slow cooling, remelting, forging, normalizing, quenching and tempering treatment simultaneously meets the requirements of highstrength, high toughness and seawater-resistant use environment, and can be used as a large-size ship main shaft material.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and in particular relates to a high-strength and high-toughness 25CrNi3MoVE steel, a preparation method and an application thereof. Background technique [0002] The main shaft of a ship is an important part of the power plant. It is repeatedly subjected to fatigue stresses such as bending, torsional stress, torsional vibration stress, longitudinal vibration stress, and gyratory vibration stress in seawater, and is corroded by seawater. It is the most severe service condition among ship structural materials. one of the components. The reliability and durability of the ship's main shaft material determine the safety and life of the ship as a whole. With the continuous increase of ship power, the diameter requirement of the alloy steel main shaft has exceeded At present, the alloy steel forgings stipulated in the corresponding standard CB / T4321-2013 in my country are only suitable for shaft ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/46C22C38/44C22C38/42C22C38/06C22C38/04C22C38/02C22C33/04C21D8/00C21D1/28C21D1/18
CPCC21D1/18C21D1/28C21D8/005C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50
Inventor 王娟李晓源王刚伟时捷田佳彬徐乐喻家鹏王隽王毛球
Owner NO 719 RES INST CHINA SHIPBUILDING IND