KAL 11 (H11 / W. Nr. 1.2343 / X37CrMoV5-1 )
KAL 11 is a standard hot work tool steel grade suitable of dies for Hot forging and die-casting applications.
It has good softening resistance, polishing properties, toughness and dimensional stability after heat treatment.
- Forging dies
- Hot punches
- Die casting dies
- Moulds for plastic injection
- Extrusion tooling
- Aircraft landing gear
Applications
| Property Thermal conductivity (W/mK) @20°C | Metric 25 |
| Coecient of Thermal Expansion (10 /K) 20-100°C 20-201°C 20-302°C 20-400°C | 11.6 11.8 12.4 12.7 |
| Specific Heat J/Kg°C | 460 |
Heat Treatment
KAL11 is supplied in spheroidized annealed condition for easier machining. After machining it can be hardened
with a heat treatment procedure including preheating, austenitizing, quenching and double tempering. Heat
treatment should be done under vacuum or under gas protection to avoid surface oxidation and
decarburization
| Annealing | Heating at 850°C – Cool down at 10°C per hour upto 650°C – Air cooling. |
| Stress relieving | After rough machining, stresses in the tool can be relieved by heating at 650°C for 2 hours followed by air cooling. |
| Preheating | Heating rate should be limited to 160°C /h (400° F/h), preheating can be done in two stages with first at ~650°C and second at 850°C followed by holding at that temperature for homogenization. |
| Austenitizing | After second preheating, temperature should be rapidly increased up to 1010°-1030°C and hold there for 30 minutes. |
| Quenching | Quench in air/oil/pressurized gas. |
| Tempering | Tempering at temperatures between 535°-645°C to obtain Rockwell C hardness of 38 to 54. Double tempering is preferred. |
Machinability
Machinability of KAL11 ranges from medium to
high as compared to water hardening tool steel.
Forming
KAL11 has good ductility and may be formed by
conventional means i.e. machining and forging.
Forging
KAL11 steel is forged at 1121 °C. For this type of
steel, forging below 899°C is not preferable.
Welding
This alloy is readily weldable by conventional
methods.
Nitriding
KAL 11 tool steel can be nitrided to give
a hard surface case.
Supply Condition
Spheroidized Annealed Hardened and
Tempered or as per customer requirement.
Size Range
Bars : 20 -750 mm Dia
Blocks: 2 m X 1 m X 12 m max (max. Forging wt. 9 MT)