Alloy steel and preparation method and application thereof

A technology of alloy steel and purpose, applied in the field of metallurgy, can solve the problems of high price, high production cost, low performance, etc., and achieve the effects of low cost, cost control, and content reduction

Active Publication Date: 2020-01-21
WUXI DOUBLE HORSE DRILLING TOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel clocks used in the general market often have factors such as large energy consumption, not environmentally friendly (such as 42MnMo7), or expensive (27CrMo45), or unstable processes (26CrMnMo)
[0006] Moreover, since the threaded part of the non-excavation drill pipe must undergo QPQ salt bath nitriding-oxidation treatment after quenching and tempering, and this process requires a certain temperature. Melting, and at the same time, the activity is also low, too high salt bath composition is easy to age, and this process temperature requires that the tempering temperature of the non-excavation drill pipe should not be lower than 580 ° C at least after quenching, otherwise the thread of the drill pipe will be nitrided The performance of the part is reduced, so that it cannot meet the standard of S135 steel grade
[0007] The tempering temperature of 42MnMo7 after quenchin

Method used

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  • Alloy steel and preparation method and application thereof
  • Alloy steel and preparation method and application thereof
  • Alloy steel and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0092] This embodiment provides a kind of alloy steel, described alloy steel is according to component mass fraction:

[0093]Carbon 0.27%, silicon 0.24%, manganese 1.28%, phosphorus 0.005%, sulfur 0.002%, chromium 1.42%, niobium 0.055%, molybdenum 0.14%, the balance is iron and unavoidable impurities.

[0094] Present embodiment also provides a kind of preparation method of this alloy steel, and its specific method is:

[0095] (1) After mixing the raw materials of each element in the formula amount, smelting and casting are carried out to obtain an ingot.

[0096] (2) Forging the ingot described in step (1) at an initial forging temperature of 1250° C. for 120 minutes, and forging at a final forging temperature of 955° C. to obtain a forged piece. The forged ingot has a mass of 50 kg, and its length, width and height are 300mm, 120mm and 120mm. The forging is forged together with the riser, the riser must be completely removed after forging, and there are no cracks, shrink...

Embodiment 2

[0109] The alloy steel provided in this example is the same as that in Example 1 in terms of component types and mass fractions of each component.

[0110] This embodiment also provides a method for preparing the alloy steel, which is the same as the method in embodiment 1 except that the tempering temperature in step (4) is 580°C.

[0111] The test results of the alloy steel provided in this example are shown in Table 1.

[0112] Figure 2a The 200x magnified scanning metallographic image of the center of the alloy steel prepared for this example shows that the matrix structure is: tempered sorbite with uniform distribution.

[0113] Figure 2b The 500x magnified scanning metallographic image of the center of the alloy steel prepared for the embodiment shows that the matrix structure is: tempered sorbite and the structure is evenly distributed.

[0114] Figure 2c The 200x enlarged scanning metallographic image of the outer wall of the alloy steel prepared for this exampl...

Embodiment 3

[0117] The alloy steel provided in this example is the same as that in Example 1 in terms of component types and mass fractions of each component.

[0118] This embodiment also provides a method for preparing the alloy steel, which is the same as the method in embodiment 1 except that the tempering temperature in step (4) is 600°C.

[0119] The test results of the alloy steel provided in this example are shown in Table 1.

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Abstract

The invention provides alloy steel and a preparation method and application thereof. The alloy steel comprises the following components of, in percentage by mass, 0.24-0.29% of carbon, 0.20-0.35% of silicon, 1.15-1.35% of manganese, 0-0.012% of phosphorus, 0-0.010% of sulfur, 1.35-1.45% of chromium, 0.04-0.08% of niobium, 0.10-0.18% of molybdenum, and the balance Fe and unavoidable impurities. Thepreparation method comprises the following steps: mixing the raw materials in the formula amount, smelting and casting, forging, rolling and performing heat treatment to obtain the alloy steel. According to the alloy steel provided by the invention, the content of the niobium and chromium elements is increased, the content of the molybdenum element is reduced, the cost of the alloy steel is low,and the alloy steel has the advantages of high strength and good toughness.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to an alloy steel and its preparation method and application. Background technique [0002] In alloy steel, in addition to iron and carbon, other alloying elements are added. It is an iron-carbon alloy formed by adding an appropriate amount of one or more alloying elements on the basis of ordinary carbon steel. According to the different elements added and appropriate processing technology, special properties such as high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, and non-magnetic properties can be obtained. [0003] Since the 1970s, the development of high-strength alloy steels worldwide has entered a new period. Based on the metallurgy of controlled rolling technology and micro-alloying, modern low-alloy high-strength steels, namely micro-alloyed steels, have been formed. new concept. [0004] In the ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/26C22C38/22C21D8/00C21D1/18E21B17/00
CPCC21D1/18C21D8/005C22C38/02C22C38/04C22C38/22C22C38/26E21B17/00
Inventor 肖瑞祥
Owner WUXI DOUBLE HORSE DRILLING TOOLS
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