Product Details

• Modulus of elasticity [103 x N/mm2]: 215
• Density [g/cm3]: 7.84
• Thermal conductivity [W/m.K]: 36.0
• Electric resistivity [Ohm mm2/m]: 0.30
• Specific heat capacity[J/g.K]: 0.46

Mechanical Properties of 1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel

Forging of 1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel

Forge at 1079°C (1975 F) down to 871°C (1600 F). Do not forge below 843°C (1550 F).

1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel Heat Treatment

Hardening

Preheating: Heat 1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel at a rate not exceeding 204°C (400°F) per hour (222°C per hour) to 621-677°C (1150-1250°F) and equalize. Soak for 30 minutes for the first inch (25.4 mm) of thickness, plus 15 minutes for each additional inch (25.4 mm).

Quenching

Quench 1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel in oil to 66-51°C (150-125°F).

Tempering

Temper 1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel immediately after quenching. Hold at temperature for 1 hour per inch (25.4 mm) of thickness when tempering at 204°C (400°F), 4 hours minimum, then air cool to ambient temperature.
However, where increased toughness is desired, at a sacrifice of some hardness, higher tempering temperatures are often used.

1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel does not become brittle, as many other die steels do, when tempered in the range of 232°C to 426°C (450 to 800°F).

To minimize the possibility of cracking, the steel should be tempered immediately after hardening and should be heated slowly to the desired tempering temperature.

Annealing of 1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel

Heat to 760°C (1400°F) and hold one hour per inch of maximum thickness. Then cool slowly with the furnace at a rate not exceeding 28°C per hour(50°F per hour) to 538°C (1000°F). Continue cooling to ambient temperature in the furnace or in air.

For improved machinability, hold at 760°C (1400°F) for 1 hour per inch (25.4mm) of maximum thickness; 2 hours minimum. Then cool slowly with the furnace cool from 677°C (1250°F) to 760°C (1400°F), hold for 8 hours, then air cool to ambient temperature.

Because of its air-hardening ability, 1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel should not be normalized.

7. Machinability of 1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel

Machinability of tool steel L6 is very good. It rates 90% of the machinability of the W-group water hardening low alloy steels rated 100% as a baseline.

8. Applications of 1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel

1.2714(L6, 55NiCrMoV7, SKT4,BH224-5) Hot-Work Mould Steel is for general purpose tools and dies where greater toughness is required, but with some sacrifice of abrasion-resistance.

Typically used below applications:

1. spindles,
2. forming rolls,
3. punches,
4. blanking and forming dies,
5. trimmer dies,
6. clutch parts,
7. pawls,
8. bearings,
9. chucks parts,
10. rollers,
11. knuckle pins,
12. clutch pins,
13. shear blades