Keywords: electric furnace, heat treatment, industrial electric furnace, HB, 40Cr, 40CrNi,

gear materials for industrial electric furnace heat treatment

common materials for gears for industrial electric furnace heat treatment

gears rely on their own structural dimensions and material strength to bear external loads, this requires the material to have high strength, toughness and wear resistance; due to the complex shape of the gear, the gear precision is required to be high, and the material technology is also required to be good. 

Common materials for heat treatment of industrial electric furnaces are forged steel, cast steel and cast iron. 

1. forged steel 

According to the hardness of the tooth surface;

HB<350 is called soft tooth surface 

H8>350 is called hard tooth surface 

l. Tooth surface hardness HB<350 

process: forging blank & rarr; normalizing-rough turning & rarr; quenching and finishing & nbsp;

Common Materials; 45#, 35SiMn, 40Cr, 40CrNi, 40MnB & nbsp;

Features;

has good comprehensive performance, tooth surface has high strength and hardness, tooth core has good toughness. & nbsp;

The cutting precision after heat treatment can reach grade 8 & nbsp;

The manufacturing is simple, economical and high in productivity, and the precision requirement is not high & nbsp;

2. Tooth surface hardness HB>350 & nbsp;

When using medium carbon steel: & nbsp;

technological process: forging blank & rarr; Normalizing & rarr; Rough cutting & rarr; Quenching and tempering & rarr; Fine cutting & rarr; High and medium frequency quenching & rarr; Low temperature tempering & rarr; Gear honing or abrasive running and electric spark running.& nbsp;

Common Materials: 45, 40Cr, 40CrNi 

Features: 

High tooth surface hardness HRC = 48-55, high contact strength, good wear resistance. 

The tooth core maintains toughness after tempering, good impact resistance, and high load-bearing capacity. 

The accuracy is reduced by half to level 7. 

Suitable for mass production, such as: medium-speed and medium-load gearbox gears such as automobiles and machine tools. 

When mild steel is used: 

Rough & rarr; & rarr; quenching & rarr; Fine cutting & rarr; Carburizing and quenching & rarr; Low temperature tempering & rarr; Grinding teeth. Level 6 and 7.

Common Materials; 20Cr, 20CrMnTi, 20MnB, 20CrMnTo 

Tooth surface hardness, strong bearing capacity. 

The core has good toughness and impact resistance 

is suitable for high speed, heavy load, overload transmission or occasions with compact structure requirements, locomotive main transmission gears and aviation gears. & nbsp;

2. cast steel 

When the gear diameter d> 400mm, the structure is complicated, forging is difficult, cast steel 

material ZG45.ZG55, normalizing can be used. Changhua, tempering. 

3. cast iron 

Strong adhesion and pitting resistance, but poor impact wear resistance. 

Suitable for smooth operation, low power or large size and complex shape. Can work under the condition of lack of oil, suitable for open transmission.

4. non-metallic 

Cloth, wood, plastic.

When selecting materials, consider: & nbsp;

The working conditions of gears are different, and the damage forms, it is the basis for determining the calculation criteria of gear strength and selecting materials and heat treatment. 

1. For gear teeth that are easy to break under impact load, materials with good toughness should be selected, and low carbon steel carburizing and quenching can be selected. & 

2. For high-speed closed transmission, the tooth surface is easy to pitting, and the material with good tooth surface hardness should be selected, and medium carbon steel surface quenching can be selected. & nbsp;

3. when low speed and medium load, gear tooth breakage, pitting corrosion and wear can occur, materials with good comprehensive mechanical properties such as mechanical strength and tooth surface hardness should be selected, and medium carbon steel tempering and fine cutting can be selected. & nbsp;

4. Strive for fewer varieties of materials, easy to manage, consider resources and supply. & nbsp;

5. When the structure size is compact and the wear resistance is high, alloy steel should be used. & nbsp;

6. Equipment and technology of the manufacturing unit.

More Gear materials for heat treatment of industrial electric furnaces: www.quenchtank.com/view-167.html