Our supply size :

Diameter : 5 to 200 mm ;

Length : 1000 to 9000 mm ;

Our capacity :

Delivery condition : Normalized, or Annealed, or Quenched and Tempered ;

Surface condition : Grounded, or Turned, or Polished

Our advantage :

1. High Quality, Reasonable Price

2. Over 40 Years Experience

3. ISO NQA Certificated Factory

4. Worldwide shipping

5. Emergency Orders and Fast Delivery

Quality Standard

ASTM A29 Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements

EN 10277 Bright steel products.

EN 10278 Dimensions and tolerances of bright steel products 

Chemical Component(%)

Mechanical Properties

( T=20°C if not differently stated )

Introduce

8620 gear steel is a low carbon nickel chromium molybdenum alloy steel. And it is a low cost steel with good carburized properties. The nickel content contributes to case toughness at high strength with above average core toughness. The chromium and molybdenum support the proper formation of carbides resulting in good surface hardness and wear. It is the most widely used carburizing alloy.  

Applications

8620 steel is strong and durable and as a result is preferred in certain manufacturing applications. It is used to make a wide range of gears, crankshafts, gear rings, pinions, piston pins, cams, gauges, tie bars, collets, bushings and bolting as well as hand tools and a multitude of machinery parts and components. Structural parts such as gears, pinions, spline shafts, pins and a variety of other important applications requiring a hard wear surface and a ductile core.

Heat Treatment and Others

This 8620 gear steel may be hardened by heating to 1500F followed by a water quench. Carburize at 1650F to 1700F in an appropriate carburizing medium and oil quench to harden. Improved carburized case and core properties can be obtained by furnace cooling from carburizing at 1650F-1700F and then reheating to 1575F.

Machinability

Machining is done prior to carburizing to within as close a tolerance as possible. Finish machining, after heat treatment and/or carburizing, should be at a minimum so as not to impair the hardened case of the part. Machining may be done by conventional means prior to heat treatment – after carburizing machining is usually limited to grinding.  

Forming

Forming characteristics of 8620 gear steel are good in the annealed condition.

Welding

The 8620 gear steel may be welded by conventional methods, usually gas or arc welding. Preheating at 400F is beneficial and subsequent heating after welding is recommended – consult the approved weld procedure for the method used.

Hot Working

Hot working may be accomplished prior to hardening or carburizing. Consult the alloy supplier for information as to temperatures.

Cold Working

The alloy may be cold worked in the annealed condition by conventional methods. Cold working, as with machining, should be done to as close a tolerance as possible before heat treatment or carburizing.

Forging

The alloy may be forged at 2200F down to 1800F prior to the hardening heat treatment or carburizing.