Available Shapes
655M13 Case Hardening Steel
655M13 is a nickel-chromium-molybdenum based case hardening engineering steel which is specifically designed for carburising. The addition of nickel increases shock resistance and toughness whilst the chromium increases the material’s hardenability giving it a uniformed hardness. Once hardened and carburised, EN36 can achieve a core strength of up to 1230 N/mm². EN36 (655M13) is used specifically in heavy duty and highly stressed applications due to its hardenability, toughness and high core strength. EN36 also offers excellent fatigue resistance.
Applications
Analysis
Carburising / Case Hardening
Softening
Heat Treatment
Applications
655M13 offers engineers a multitude of performance options based on the material’s delivery condition. Application examples include: Aircraft and automotive crankshafts Ball and roller bearings Highly stressed gears, collets and gudgeon pins Connecting rods with case hardened ends Heavy duty gears, ring gears Heavy duty bushes Couplings and shaft
Analysis
| Carbon | 0.10-0.16% | Nickel | 3.00-3.75% |
| Manganese | 0.35-0.60% | Chromium | 0.70-1.00% |
| Silicon | 0.10-0.35% | Sulphur | 0.040% max |
| Phosphorous | 0.035% max |
Carburising / Case Hardening
Carburising and case hardening will give a hard wear resisting surface and a tough core strength to 655M13. Ensure that surfaces are free from dirt and grease, and of low sulphur content. Case hardening can be carried out in salt baths with selected content depending on the type of salt and the depth of penetration required. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Time, temperatures and salt selection will be advised by your heat treatment provider.
Softening
If it is necessary to soften the 655M13 for machining between the carburising and subsequent heat treatment stages, heat to 640-650°C. Soak at this temperature for one to two hours and cool slowly in the furnace or in air.
Heat Treatment
Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each 655M13 steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of 655M13 case hardening steel.
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