EN24 | 817M40 ALLOY STEEL-BS 970

EN24/817M40 alloy steel manufacturers and suppliers,supplied with round rods,square/flat bars,rollers,shafts,blocks and forging pieces.

EN24 steel is a common nickel-molybdenum alloy steel according to BS standard. It is a high strength steel and has good comprehensive mechanical properties. EN24 steel  is usually supplied in the finally heat treated condition which is widely used in the manufacture of the camshaft and connecting rod of engine parts, poor processability, belongs to the typical difficult-to-machine materials.

en24 forged round bar

 1.Chemical Composition

EN240.36-0.440.10-0.40 0.45-0.70 ≤0.035 ≤0.04 1.0-1.4 1.3-1.7 0.2-0.35

Heat Treatment
Normalizing For EN24
1.Nominal normalizing temperature:840-900°C
2.Hold the temperature for several hours
3.Cooling in the air

Annealing  For EN24
1.Nominal Annealing temperature:800-860°C
2.Cool slowly in the furance
3.Maximum Brinell hardness of 270

Hardening and Tempering(QT)  For  EN24
1.Nominal Hardening temperature:830-865°C
2.Hold at this temperature then quench in oil
3.Tempering  as soon as possible when the temperature low to ambient temperature
4.Heat the steel carefully to a suitable temperature selected by reference to a tempering chart or table
5.The usual tempering temperature is 600°C which depending on the actual requirements
6..keep the material out of the furnace ,then cool in the air

Mechanical Property( for reference only)
1.Tensile strength: 1020MPa
2.Yield point: 945MPa
3.Percentage reduction of area after fracture: 55%
4.Elongation after fracture: 13%
5.Impact test (+20°C): Transverse – 27~32J; Longitud – 45~50J

Delivery Condition
1.Shape:Round/Square / Flat/Shafts/Rollers/Blocks
2.Surface condition:Black surface/Bright surface
3.Heat Treatment:Normalized/Annealed/QT
4.Straightness:Max 3mm/m(Enhanced straightness may be available on request)
5.Length:3000-5800mm suitable for 20″container.  above 6000mm,suitable for 40″ container
6.Grain Size: 5-8 acc to ASTM E112-96
7.Typcial Hardness:HRC28-32
8.Ultrasonic Standard: Sep1921/ASTM A388/EN 10228-3
9.Non Metallic Inclusion: 2 max acc to ASTM E45 /K4≤20 acc to DIN 50602
10.Forging Ratio: minimum 4 : 1
11.Marking: Grade/Weight/Length/Size/Heat Number

Quality Certification
A material test report(Inspection Certificate EN 10204 3.1) will be provided, documenting the following:
1.Chemical analysis
2.Mechanical properties
3.Surface hardness
4.Non Metallic Inclusion
5.Heat Treatment Process
6.Grain size
7.Forging ratio
8.NDE test method/criteria

EN24 Supply Form & Size

  • Round Bars:  Dia.80 – 1,000mm as Forged
  • Flat / Square Bars:  Thickness Max.800mm
  • Shafts, Rollers, Blocks,Tubes:  Customized or According to Drawing
  • Rolled Round Bars:  Dia.16 – 130mm with UT Assurance

Heat treatment: Normalizing (+N), Annealing (+A),Q&T
Surface finish:Black / Rough turned / Peeled