Alloy Steel - En39B

EN39B ROUND BARS HEAT TREATMENT ALLOY STEEL

EN39B is a 4 1/4% Nickel Chromium Molybdenum carburising steel, generally supplied annealed to HB 277 max. Carburised and heat treated it develops a hard wear resistant case of about Rc 6-63 and a tough strong core with a typical tensile strength range 1000-1400MPa, in small to quite large sections. ​ ​

Chemical Composition of En39B
Element Min. % Max. %
Carbon 0.12 0.18
Silicon 0.10 0.35
Manganese 0.25 0.50
Nickel 3.90 4.30
Chromium 1.00 1.40
Molybdenum 0.15 0.3
25CrMo4 Mechanical Properties

Compared to other grades of steel, 25CrMo4 steel has high tensile strength. The 25CrMo4 is hard and finds application in hard machine parts. It has good ductility, extreme toughness, and good wear resistance in quenched and tempered conditions.

Property Value
Tensile Strength 480-1200 MPa
Yield Strength 250-750MPa
Elongation 11-26%
Hardness 180-350 HB ​
En39B PRODUCTS
Round Bars Size
Product Name
  • En39B Hot Rolled Round Bars
  • En39B Cold Rolled and Cold Drawn Round bars
  • En39B Peeled Round Bars
  • En39B Ground Round Bars
  • En39B Polished Round Bars
  • En39B Turned Round Bars
  • En39B Forged Bars
  • En39B Proof Machine Bars
Size
  • 16mm dia to 250mm dia
  • 3mm dia to 100mm dia
  • 3mm dia to 65mm dia
  • 3mm dia to 65mm dia
  • 3mm dia to 65mm dia
  • 10mm dia to 1200mm dia
  • 30mm dia to 1500mm dia
  • 30mm dia to 1500mm dia
Square Bars Size
Product Name
  • En39B Hot Rolled Square Bars
  • En39B Cold Drawn Square Bars
  • En39B Peeled Square Bars
  • En39B Ground Square Bars
  • En39B Polished Square Bars
  • En39B Forged Square Bars
  • En39B Proof Machine Bars
Size
  • 10mm Square to 200mm Square
  • 10mm Square to 80mm Square
  • 5mm Square to 80mm Square
  • 5mm Square to 80mm Square
  • 5mm Square to 50mm Square
  • 30mm Square to 1500mm Square
  • 30mm Square to 1500mm Square