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Low alloy steel

A low-alloy steel and process technology, used in metal processing equipment, coating, casting and molding equipment, etc., can solve the problems of large cracking and deformation, poor toughness, large grain size of castings, etc., and achieve high fatigue strength and good toughness. , the effect of high casting yield

Active Publication Date: 2013-01-09
宁波吉威熔模铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN101736189B discloses a high-frequency quenching gear and the heat treatment process of the gear. The gear is cast and formed, and is made after high-frequency quenching and tempering. However, the carbon content in the gear steel provided by it is relatively high, and the crystal of the casting The grain size is larger, the toughness is poor, and the tendency of cracking and deformation after high-frequency quenching is large

Method used

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Embodiment 1

[0048] The low-alloy steel of the present invention is smelted in a vacuum induction furnace, and its specific chemical composition is shown in Table 1.

[0049] Table 1 Chemical Composition List

[0050]

[0051] Gears are then prepared as follows:

[0052] 1) Make pattern with foam material, the tooth shape of pattern is consistent with the tooth-shaped parts; Apply adhesive on the surface of pattern, sandblast and dry; The sandblasting is silicon carbide; The adhesive is polyacrylamide; The pattern is placed in the sand box, the sprue is placed, sand is filled into the sand box for modeling, and a riser is set on the pattern; the alloy material is smelted; the melting temperature is 1620°C, and the pouring temperature is 1530°C; pouring; after cooling, open the box Shakeout to clean the castings;

[0053] 2) Austempering is carried out after the above-mentioned cast casting is processed, and then high-frequency quenching is carried out;

[0054] 3) Quenching the heate...

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Abstract

The invention relates to low alloy steel. The low alloy steel comprises, by weight, C 0.55-1.24%, Si 0.2-0.35%, Mn 1.05-1.35%, Cr 1.50-1.80%, Ni 1.30-2.20%, Mo 0.20-0.45%, Cu 0.4-0.6%, Ti 0.05-0.08%, N <= 0.015%, S < 0.005%, P < 0.005%, O <= 25 ppm and the balance of Fe and inevitable impurities. Compared with the prior art, the low alloy steel is good in comprehensive performance, has high hardness, good toughness and high fatigue strength, is good in casting performance and high in finished casting product ratio, and has the advantages of having more than 900 MPa of tensile strength and more than HRC58 of Rockwell hardness and being good in ductility and toughness.

Description

technical field [0001] The present invention relates to a low alloy steel, and in particular to a low alloy steel for gears or bearings. Background technique [0002] Gears are generally made of special gear steel, first processed into gear blanks, and then processed by machining, tooth profile processing, heat treatment, finishing and other processes. During the heat treatment process, the quenching treatment is to make the tooth surface meet the specified hardness requirements. Hardenability is one of the important performance indicators of gear steel. It mainly ensures the hardness of the core of gears of different sizes and helps control the heat treatment deformation of gears. The control of the hardenability and hardenability bandwidth of gear steel mainly depends on the chemical composition and its uniformity. That is, the control of elements that have a great influence on hardenability, such as carbon and manganese, etc., according to the influence of carbon and all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50B22C9/04B22C3/00B22C1/20C21D6/00C21D1/18
Inventor 罗绍康
Owner 宁波吉威熔模铸造有限公司
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