Project Description

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.

EN24 Forged round steel
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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 FinishBlack-Forged Black-Rolled Turned   GrindingPolishedPeeledCold Drawn
Tolerance(0,+5mm)(0,+1mm)(0,+3mm)Best h9Best h11Best H11Best H11

2.Chemical Composition

GradeCSiMnPSCrNiMo
EN240.35-0.450.10-0.350.45-0.7≤0.05≤0.050.9-1.41.3-1.80.2-0.35
817M400.36-0.440.1-0.40.45-0.7≤0.035≤0.041.0-1.41.3-1.70.2-0.35

3. Equivalent Grade

ASTM:4340
EN/DIN:34CrNiMo6/DIN 1.6582
JIS:SNCM449
GB:40CrNiMo

4. Mechanical Property


Condition
Hardened & Tempered
STUVWXYZ
Ruling Section,inch6642 1/21 1/81 1/81 1/81 1/8
Tensile Strength,Mpa,Min77585092510001080116012351545
Yield Strength,Mpa,Min58568074080089597010501310
Elongation,Min201817161514148
ISO V Impact,J,Min5454484840343011
Hardness,HBW223-277248-302269-321293-341311-375341-388363-415≥444

0.2% Proof Stress tests value with Quenched & Tempered condition

PropertySTUVWXYZ
Proof Stress(0.2%) Mpa,Min5556357107758509109901235

EN24 Round steel Lab Tesing Data with Quenched & Tempered condition

Diameter,mmTensile Strength MPaYield Strength MPaElongation %Reduction % Impact,JHardness,HB
Φ4209607901542.576/52/50291
Φ4309607951448.586/68/68299
Φ450940750185095/90/110302

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.

6.Heat Treatment

  • Normalizing

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

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 steel Annealing diagram

  EN24/817M40 Annealing Diagram

  • Hardening

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

Tempering process should be followed after quenching immediately.Tempering at a suitable temperature not exceeding 660ºC .

7.Application

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.

Typical Applications:

  • Heavy-duty axles &  Shafts
  • Punches & Dies
  • Studs & Bolts
  • Gears & Rings
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