Alloy Steel SCM440 SAE4140 1.7225 42CrMo Steel Round Bar For Mechanical Use Gear

1. Chemical composition(%)

2. Equivalent grades

3. Available size(mm)

4. Feature
It's characterized by good strength, hardenability and toughness, and it has high creep strength and long lasting strength under the high temperature.

5.Appliation

It's used to manufacture forgings that require higher strength and larger quenched and tempered section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods and spring clamps that are heavily loaded. It can also be used for drill pipe joints and fishing tools for oil deep wells below 2000m.

6. Hardness

For anneal, the hardness is less than 217HB.

For Q+T, the hardness is 28-32HRC.

7.Heat Treatment

When forging, firstly preheat the steel carefully, then raise the temperature to 1150-1200°C for forging. Do not forge below 850°C.

When annealing, firstly heat the AISI 4140 slowly to 800-850°C and allow enough time for the steel to be thoroughly heated, then cool slowly in the furnace to 480°C followed by air cooling.

8. Product pictures

Warehouse



Processing



Strict Quality Control

Guangzhou ChangFeng Steel Co., Ltd. is a professional special steel company, which specialized in exporting mould steel products based in China.With twenty years experience in special steel industry, our main products are Plastic Mould Steel, Hot Work Mould Steel, Cold Work Mould Steel, Alloy Structural Steel, Tool Steel, Stainless Steel, Carbon Steel and Forged Block.

To ensure provide high quality products to customers, we have close cooperation with many Chinese first class special steel enterprises, including Baosteel Group, Dongbei Special Steel, Changcheng Special Steel, Hongsheng Heavy Industry, Xingcheng Special Steel, Daye Special Steel. We have thousand tons of stock materials in our own factory and also can provide processing services to customers. We are full of export experience for many years, the product covers America, Germany, France, Italy, Turkey, Singapore, Thailand, Malaysia, Vietnam, Taiwan, and Middle-East.

After years of development, the company has established a complete quality management and export service system. We have a group of experienced and competent elites and is capable of offering the best service to clients. Our company equips with large-sized Vertical saw machines, Horizontal saw machines, Milling machines, Grinding machines and other advanced equipments to provide customers with cutting and other processing services. All the products should be inspected the metallographic analysis, hardness, ultrasonic flaw detection and other strict inspection processes, which meet the standards of DIN, AISI, JIS and GB to ensure their function and quality.

Our company keeps the principle of “sincerely cooperation, endless striving for perfection”. We desire to establish the long-term mutual beneficial and win-win relationship with clients all over the world.