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
| 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 |
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