18CrMo4/1.7243 Alloy Steel

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18CrMo4/1.7243 Alloy Steel

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. Alloy special steels

Chemical Composition

0.15-0.21max   0.40.6 – 0.9max   0.025max   0.0350.9-1.20.15-0.25

Equivalent Grades of Steel 18CrMo4(1.7243)




Description of Steel 18CrMo4(1.7243)

18CrMo4 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.

Size Tolerance

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

Mechanical properties of Steel 18CrMo4(1.7243)

Heat Treatment Conditions

Heat Treatment ProcessTemperature RangeCooling Method
Normalizing870-900°CCooling in air
Soft Annealing680-700°CCooling in furnace
Stress Relieving50°C under the temperature of temperingN/A
Hardening850-880°COil or Polymer Cooling, 840-850°C Water Cooling
Tempering150-200°CCool in still air
Product TypeMaterial GradesSpecification
Hot-Rolled Round Bars18CrMo4, 1.7243, 18HGMN/A
Forgings18CrMo4, 1.7243, 18HGMN/A
Forged Bars18HGM, 18CrMo4, 1.7243N/A


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