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A kind of martensitic heat-resistant steel and its preparation method

A martensitic and heat-resistant steel technology, applied in the field of heat-resistant steel, can solve the problems of high-temperature tempering brittleness, high tempering temperature, and processing difficulties, achieve high strength and hardness, improve high-temperature toughness, and avoid tempering The effect of fire brittleness

Active Publication Date: 2020-11-24
XIJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different types and contents of alloying elements will significantly affect the performance of martensitic heat-resistant steel, such as causing brittleness, difficulty in processing, and increased cost.
Different tempering processes will also significantly affect the mechanical properties of martensitic heat-resistant steel
Low temperature tempering leads to insufficient toughness of the material, which can easily cause temper brittleness; while high tempering temperature increases energy consumption, prolongs the process time, and leads to insufficient material strength, which may also cause high temperature temper brittleness

Method used

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  • A kind of martensitic heat-resistant steel and its preparation method
  • A kind of martensitic heat-resistant steel and its preparation method
  • A kind of martensitic heat-resistant steel and its preparation method

Examples

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preparation example Construction

[0036] Preparation method of the present invention:

[0037] Firstly, the steel ingot conforming to 15Cr12Ni2Mo2WMnSiVNbN alloy elements is subjected to high-temperature solution treatment in the temperature range of 1150°C to 1050°C, so that the alloy elements are completely dissolved in the austenite, and then high-temperature forging is carried out at a forging temperature of 1050-900°C to achieve refinement. Structure: Quenching treatment is carried out after forging, and the quenching medium is 60°C quenching oil to obtain a martensite-based structure; finally, tempering treatment is carried out: the tempering temperature is 560-610°C, and the temperature is kept for 1.5-4 hours.

[0038] Further, include the following operations:

[0039] 1) The element ratio of the following mass percentages is smelted into steel ingots:

[0040] C: 0.1-0.2%; Cr: 9-14%; Ni: 2.5-3.5%; Mo: 1.0-2.0%; W: 0.5-1.0%; Mn: 0.5-1.0%; Si: 0.10-0.5%; : 0.10~0.5%; Nb: 0.1~0.5%; N: 0.02~0.05%; the ...

Embodiment 1

[0048] New martensitic heat-resistant steel and its preparation process

[0049] The percentages of alloying elements in smelted steel ingots are: C: 0.17; Cr: 14; Ni: 2.8; Mo: 0.7; W: 0.6; Mn: 0.7; Si: 0.2; V: 0.15; . Steel ingot weighs 12Kg. After high-temperature solid solution, high-temperature forging and quenching, the blank is tempered. The tempering temperature is 575°C, and the tempering holding time is 1.5 hours.

[0050] 3 samples were taken respectively at different parts of the billet, and were observed and analyzed by metallography, scanning electron microscope and transmission electron microscope (results such as figure 1 , figure 2 , image 3 As shown), the carbon and nitrogen compounds precipitated in a large amount in a dispersed state, mainly M2X and M7C3 type carbides, accompanied by a small amount of MX and M6C type carbon and nitrogen compounds; the martensitic lath was recovered to a certain extent (see figure 2 ), which are finely and uniformly ...

Embodiment 2

[0053] New martensitic heat-resistant steel and its preparation process

[0054] The percentage of alloy elements in the smelted steel ingot is: C: 0.11; Cr: 11.3; Ni: 3.2; Mo: 1.3; W: 0.8; Mn: 0.55; Si: 0.12; Steel ingot weighs 15Kg. After high-temperature solid solution, high-temperature forging and quenching, the blank is tempered. The tempering temperature is 595°C, and the tempering holding time is 4 hours.

[0055] Three samples were taken from different parts of the billet, and observed and analyzed by metallography, scanning electron microscope and transmission electron microscope, the number of carbon and nitrogen compounds precipitated was large, in a diffuse distribution state, mainly M2X and M7C3 carbides, accompanied by a small amount of MX And M6C-type carbonitrides; martensite laths have been restored to a certain extent, and they are finely and evenly distributed.

[0056] The mechanical properties of the workpiece in Example 2 were tested, and the impact en...

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Abstract

The invention discloses martensite heat-resisting steel and a preparation method thereof. The martensite heat-resisting steel is prepared from all elements in mass percent: 0.1 to 0.2% of C, 9 to 14%of Cr, 2.5 to 3.5% of Ni, 1.0 to 2.0% of Mo, 0.5 to 1.0% of W, 0.5 to 1.0% of Mn, 0.10 to 0.5% of Si, 0.10 to 0.5% of V, 0.1 to 0.5% of Nb, 0.02 to 0.05% of N and the balance of Fe, wherein dissolved-out carbon nitride compound is in a dispersively-distributed state, and the carbon nitride compound is prepared from M2X type, M7C3 type, MX type and M6C type carbide. According to the martensite heat-resisting steel disclosed by the invention, an alloying design of the martnesite heat-resisting steel and a tempering technology are accurately controlled and combined; by means of adjusting contentsand kinds of alloy elements and utilizing a lower temperature for tempering, high-temperature toughness performance of the martensite heat-resisting steel can be remarkably improved; high toughness is obtained, higher strength and hardness are kept simultaneously, and tempering brittleness is avoided.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant steel, and relates to a martensitic heat-resistant steel and a preparation method thereof. Background technique [0002] Martensitic heat-resistant steel usually has high creep strength, corrosion resistance, high thermal strength and thermal conductivity, and low thermal expansion coefficient, and is widely used in high-temperature working parts, such as steam turbine blades, valves, and steam boilers , Internal combustion engine exhaust valve, aerospace and petrochemical and other equipment. These components have been served in high-temperature environments for a long time, bear various loads (tension, bending, torsion, impact, fatigue, etc.), and are in contact with high-temperature steam, air or gas at the same time, and the working environment is very harsh. With the development of gas turbines and other high-temperature and high-pressure technologies, higher and higher requirements a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/02C22C38/04C22C38/46C22C38/48C21D6/00C21D1/18
CPCC21D1/18C21D6/004C21D6/005C21D6/008C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48
Inventor 乔勋王琳淋李京泽赵巧绒孙琳琳党波白旭峰
Owner XIJING UNIV
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