EN24/ AISI 4340/ 40NiCrMo84

As rolled and Spheroidized Annealed

Standard Grade C Mn P S Si Ni Cr Mo
ASTM A29 4340 0.38-0.43 0.60-0.80 0.035 max 0.040 max 0.15-0.35 1.65-2.00 0.70-0.90 0.20-0.30
EN 10250 36CrNiMo4 / 1.6511 0.32-0.40 0.50-0.80 0.035 max 0.035 max 0.40 max 0.90-1.20 0.90-1.2 0.15-0.30
BS 970 EN24 / 817M40 0.36-0.44 0.45-0.70 0.035 max 0.040 max 0.10-0.40 1.30-1.70 1.00-1.40 0.20-0.35
JIS G4103 SNCM 439 / SNCM 8 0.36-0.43 0.60-0.90 0.035 max 0.030 max 0.15-0.35 1.60-2.00 0.60-1.00 0.15-0.30

EN24 steel is a medium carbon, low alloy steel known for its toughness and strength in generally large sections. EN24 is likewise one kind of nickel chromium molybdenum steels. It can  be supplied hardened and tempered in the tensile range of 930-1080 Mpa as well as annealed condition. Pre hardened and tempered EN24 steels can be further surface hardened by flame or induction hardening and by nitriding. The EN24 steel has great shock and impact resistance as well as wear and abrasion resistance in the hardened condition.

EN24 steel is high tensile alloy steel famous for its excellent wear resistance properties and in addition to where high strength properties are required. This Grade is used in components affiliated to shafts, gears, studs and bolts. Its hardness is within the range of 248~302 HB. It might be further surface-hardened to make additional with more advantageous wear resistance by means of induction or nitriding processing.

STEEL PROPERTIES

  • Standard high-speed steel grade
  • Contains well-balanced alloy composition
  • High toughness
  • Great cutting edge retention

APPLICATIONS

Basically utilized in all metal-cutting tools for roughing or finishing such as twist drills, thread dies, diverse milling cutters, reamers, broaches, circular saw segments, countersinks, thread chasers, shaping tools and woodworking tools. Also highly suitable for cold-forming tools such as cold extrusion rams and dies, as well as cutting and precision cutting tools, plastic moulds with elevated wear resistance and screws.

PHYSICAL PROPERTIES

Thermal Conductivity at °C W / (m*K)
20 40.5
350 32.5
700 25.5

HEAT TREATMENT

Soft Annealing °C 650-700
Cooling Slowly
Hardness HB max. 280
Stress-relief Annealing °C 630-650
Cooling Furnace

 

1st Pre-Heating °C up to approx. 400 in an air-circulating furnace
2nd and 3rd 780 and 1000
Hardening °C 1190-1230
Quenching Salt Bath, at least 520°C Oil, Air
Tempering °C at least twice 530-560
Hardness after Temperature HRC 64-66

SIZE RANGE

ROUNDS -6  to  450 MM DIA.

SQUARES -32 to 155 MM

FLATS – THICKNESS -15  to 105 MM  | WIDTH -40 to 405 MM

Stocking Partners- We keep the materials from China and India.

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