18CrMo4/1.7243

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

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 of Steel 18CrMo4(1.7243)

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

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 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 of Steel 18CrMo4(1.7243)

Heat Treatment Conditions

Heat Treatment Process	Temperature Range	Cooling Method
Normalizing	870-900°C	Cooling in air
Soft Annealing	680-700°C	Cooling in furnace
Stress Relieving	50°C under the temperature of tempering	N/A
Hardening	850-880°C	Oil or Polymer Cooling, 840-850°C Water Cooling
Tempering	150-200°C	Cool in still air

Product Type	Material Grades	Specification
Hot-Rolled Round Bars	18CrMo4, 1.7243, 18HGM	N/A
Forgings	18CrMo4, 1.7243, 18HGM	N/A
Forged Bars	18HGM, 18CrMo4, 1.7243	N/A