chemical composition & mechancial property

  Product Name: 20Cr/40Cr Hot Rolled Steel Round Bar

           Standard: JIS, ASTM, GB, DIN, EN, AISI

           Diameter; 3mm-500mm

               Length:1m~12m

Package Detail:Export standard package, bundled or be required.

   Delivery Time:7 days for stock sizes; 10-15 days for sizes need production

What we can offer?

We offer a wide range of steel products in a wide variety of dimensions and materials, to the common international specifications or customerized.We mainly provide stock steel plate and sheet  and  processed steel plate. The processing plates conclude cutting the larger plate into the small sizes customer demand, cut by drawing, cut to special sizes, weld the cut parts by drawing, also make galvanizing processing or surface painting on the final processed parts. Having large stocks for the carbon steel and low alloy steel plates and sheets, especially have the thick plate and heavy plates on stock, also can provide the special material and large size steel plates, boiler and pressure vessel steel plate, marine steel plate, hot rolled steel plate for new production. Also has hollow bars, thick wall seamless pipes and tubes on stock. 

   #  hot rolled steel plate;

   #  cold rolled steel plate;

   #  galvanized steel plate;

   #  al-zinc steel coil plate;

   #  stainless steel plate Steel pipe:

   #  seamless pipe;  

   #  galvanized round pipe;

   #  stainless steel pipe

   #  round bar

   #  angle bar;

   #  channel bar;

   #  h beam;

   #  rectangular tubes 

Application 

20Cr/40Cr LARGE DIAMETER ROUND BAR steel round bar diameter 80mm Stock Sizes big steel bar

1): Can be used in many fields such as building, automobile, shipbuilding, petrochemical, machinery, medicine, food, electric power, energy, space, building and decoration, etc.

2): Can be made into mould template, mortise pin, column

3): This kind of steel have good mechanical property, is widely used in structural parts which may support stress alternation, especially made into some connecting rods, bolts, wheel gear...

Production Flow

Theorectical weight
 

 Hot rolling is a metalworking process that occurs above the recrystallization temperature of the material. After the grains deform during processing, they recrystallize, which maintains an equiaxedmicrostructure and prevents the metal from work hardening. The starting material is usually large pieces of metal, like semi-finished casting products, such as slabs, blooms, and billets. If these products came from a continuous casting operation the products are usually fed directly into the rolling mills at the proper temperature. In smaller operations the material starts at room temperature and must be heated. This is done in a gas- or oil-fired soaking pit for larger workpieces and for smaller workpieces induction heating is used. As the material is worked the temperature must be monitored to make sure it remains above the recrystallization temperature. To maintain a safety factor a finishing temperature is defined above the recrystallization temperature; this is usually 50 to 100 °C (90 to 180 °F) above the recrystallization temperature. If the temperature does drop below this temperature the material must be re-heated before more hot rolling