KAL THERM

KAL THERM (W. Nr. 1.2714/56NiCrMoV7)

  • KAL THERM is nickel chromium molybdenum hot work tool steel.
  • Exhibits high compact toughness and good resistance to softening at elevated temperature.
  • High nickel content imparts toughness and through hardening in large section thickness.
  • Good resistance to thermal shocks and fatigue cracking.

Applications

Forging dies | Hot shear knives | Hot punching tools | Die holders | Cores and Cavities | Large – size moulds with high quality finish | Plastic injection or compression mould | Thermoplastics (PE, PS, PP) | Thermosetting plastics | LFT | ABS | Transparent melts | Compression dies under high mechanical and thermal stresses

Physical Properties

Property
Thermal Conductivity ( W/m K ) @25° C
Metric
36
Coeffcient Of Thermal Expantion (10-6/K) 
20-100° C
20-200° C
20-400° C
11.0
12.0
13.4
Specific Heat J/Kg° C460

Non Metallic Inclusions (ASTM E45)

RouteA (Max)B (Max)C (Max)D (Max)
 THTHTHTH
VD route1.01.01.01.01.01.01.01.0

Equivalent Designations of KAL THERM

CountryUSAGermanyJapanFranceEngland
StandardASTMDIN, W, Nr.JISAFNORBS
GradesL61.2714/55NiCrMoV6SKT455NCDV7BH224-5

Typical Saarloha Chemical Composition

ElementCMnSiCrVMoNiPS
Min0.530.750.151.000.090.401.50
Max0.560.900.301.200.150.501.700.0150.005

Heat Treatment

PreheatingHeating at the rate of less than 160° C/h to 650° C for equalization.
Raise the temperature to 815-870° C.
AnnealingAnnealing at a temperature in between 685-710°C results in hardness levels of <= HB 250.
Stress relievingStress relieving should be carried out by heating to 645°C, holding for at least 1 hour, followed by air cooling.
HardeningHarden from a temperature of 835-870°C followed by oil quenching.
Quench hardness -58.5 HRC.
Harden from a temperature of 835-895°C followed by air cooling.
Quench hardness -56.5 HRC.
TemperingTempering can be carried out at various temperatures to achieve different properties.

Typical Mechanical Properties

Tempering°C100200300400500600
In oilHardness, HRC57.555524945.539
In airHardness, HRC555350.547.54337

Machinability

Machinability of KAL THERM ranges from medium to high. Machining after hardening tempering should be avoided and should be limited to finish machining only.

Forming

KAL THERM has good ductility and may be formed by conventional means i.e. machining and forging.

Forging

Hot forging temperature 1050 – 850 °C.

Welding

This alloy is readily weldable by conventional methods.

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)