EN24 steel Manufacturer and Exporter,supplied with round,square,flat,block,and shaft etc.EN24/817M40, ‘1.5% Nickel-Chromium-Molybdenum’ alloy steel, has a good combination of strength, ductility, low temperature impact, wear resistance and good machinability.This steel is usually supplied in annealed condition after forged,and also suitable for hardened and tempered condition with tensile ranges of S(775-925Mpa),T(850-1000Mpa),U(925-1080Mpa),V(1000-1160Mpa),W(1080-1235Mpa),X(1160-1320Mpa),Y(1235-1390Mpa),and Z(1545Mpa). For further process,it can be surface-hardened typically to 58-60 HRC by induction or nitride processes, producing components with enhanced wear resistance.
1.Supply Form & Size & Tolerance
Hot Forged Round bar:Φ80-Φ1000mm
Hot Rolled Round bar:Φ16-Φ280mm
Hot Forged Square bar: Max Thickness:500mm
Flat bar/Blcoks:Thickness :120-800mm ,Width:120-1500mm
|Surface Finish||Black-Forged||Black-Rolled||Turned||Grinding||Polished||Peeled||Cold Drawn|
|Tolerance||(0，+5mm)||(0，+1mm)||(0，+3mm)||Best h9||Best h11||Best H11||Best H11|
3. Equivalent Grade
4. Mechanical Property
|Hardened & Tempered
|Ruling Section,inch||6||6||4||2 1/2||1 1/8||1 1/8||1 1/8||1 1/8|
|ISO V Impact,J,Min||54||54||48||48||40||34||30||11|
0.2% Proof Stress tests value with Quenched & Tempered condition
|Proof Stress(0.2%) Mpa,Min||555||635||710||775||850||910||990||1235|
EN24 Round steel Lab Tesing Data with Quenched & Tempered condition
|Diameter,mm||Tensile Strength MPa||Yield Strength MPa||Elongation %||Reduction %||Impact,J||Hardness,HB|
5.Forging EN24/817M40 Steel
Recommended Forging temperature:850℃- 1150℃,and final forging temperature should not below 850℃.Cooling as slowly as possible in the furnace to prevent surface crack,and annealing immediately after forged is recommended.
Normalizing is used to refine the structure of forgings that might have cooled non-uniformly after forged,and considered as a conditioning treatment before final heat treatment.Normalizing temperature for EN24 steel should be carried out between 850℃-880℃ with several steps,keep proper holding time depend on the steel size for the steel to be thoroughly heated to complete the ferrite to austenite transformation.Cool in still air.
Annealing is generally applied after forged and before machining to reduce surface harness,and get finer grain,get good machinability.
Soft Annealing:Heat the steel to the temperaure 650℃-680℃,Holding temperature for the steel heating, Cool slowly in the furnace.
Full Annealing:Heat the steel to the temperaure 820-850℃ with three steps ,Holding temperature for the steel heating,Cool in furnace.Surface hardness after annealing will be below 248HB.
EN24/817M40 Annealing Diagram
Hardening temperature is carried out from an austenitizing temperature of 820-850ºC with several steps,keep suitable time for the steel to be thoroughly heated, oil quenching is recommended.
Tempering process should be followed after quenching immediately.Tempering at a suitable temperature not exceeding 660ºC .
EN24/817M40 steel is widely used as engineering steel in Automobile Industry, Construction, Pharmaceutical / Chemical Industry, Oil & Gas Industry.It is often utilized where other alloy steels do not have the hardenability to give the strength required. For highly stressed parts it is also an excellent choice.
- Heavy-duty axles & Shafts
- Punches & Dies
- Studs & Bolts
- Gears & Rings