Product

China 18CrMo4-Alloy steel

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China 18CrMo4-Alloy steel is a low carbon case hardening steel which has at least 0.9Cr%,0.15%Mo as strengthening elements as per EN10084 standard.It has good process performance ,and has high strength when temperature at 500-550 °C.The oxidation resistance is deteriorated and the creep strength is remarkably lowered when temperature exceeds 550°C.The weldability of 18CrMo4 steel is also very good, with excellent machining or cutting properties.

Reference standard

  • EN 10084: 2008 Case hardening steels. Technical delivery conditions
  • EN 10263-3: 2001 Steel rod, bars and wire for cold heading and cold extrusion. Technical delivery conditions for case hardening steels
  • EN 10250-3: 2000 Open steel die forgings for general engineering purposes.

Application

China 18CrMo4-Alloy steel is widely in gear components of all kind and cog wheels. Open die steel forgings for general engineering purposes.High and medium pressure steam pipes, headers and superheaters.

Chemical composition

C Si Mn P S Cr Mo
0.15-0.21 max   0.4 0.6 – 0.9 max   0.025 max   0.035 0.9-1.2 0.15-0.25

Equivalent Grades

EU Germany Japan France England Russia Inter
EN DIN,WNr JIS AFNOR BS GOST ISO
18CrMo4 18CrMo4 SCM418 18CD4 708H20 20KHM  

18CrMo4

 

Size Tolerance

Surface Finish Size Tolerance Length
Black For Forged condition (0,+5mm) Multiple Length/Fixed Length
Black For Rolled condition (0,+1mm)
Rough Turned (0,+3mm)

Mechanical properties

  • Tensile Strength:min 1080 N/mm2
  • Yield Strength:min. 880N/mm2
  • Elongation:min.10 %(l)
  • Kv-Imapct value:min.72J (l)

Heat Treatment Conditions

  • +A   Soft annealed/Soft annealing
  • +N   Normalized/Normalizing
  • +QT  Quenched and Tempered
  • +U   Untreated
  • +SR  Stress Relieved

Normalizing:870 – 900℃,Cooling in air

Soft Annealing:680- 700℃,Cooling in furnace

Stress Relieving:50°C under the temperature of tempering

Hardening:850 – 880°C,oil or polymer,840-850°C,water

Tempering:150 – 200℃, cool in still air

Hot-rolled round bars 18CrMo4, 1.7243, 18HGM

Forgings 18CrMo4, 1.7243, 18HGM

Forged bars 18HGM, 18CrMo4, 1.7243

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