Excellent quality M42 Super High Speed Steel Supplier in dongguan

1.ChemicalComposition(%)

2.  Heat Treating

3.Form&Size

1)M42 Tool Steel round bars, flat/square bars,plates,sheets.

2)M42 Tool Steel Size Available(Length can be customized)

4 .PHYSICAL PROPERTIES

• Density: 0.282 lb/in³ (7806 kg/m³)
• Specific Gravity: 7.81
• Modulus of Elasticity: 30 x 10⁶ psi (207 GPa)
• Machinability: 35-40% of a 1% carbon steel

5. Preheating:

Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1500-1600°F (816-871°C), and equalize.

6. Austenitizing (High Heat):

Heat rapidly from the preheat.

7. Quenching

• Pressurized gas, warm oil, or salt. For pressurized gas, a rapid quench rate to below 1000°F(538°C) is critical to obtain the desired properties. 

• For oil, quench until black, about 900°F (482°C), then cool in still air to 150 -125°F (66-51°C).
• For salt maintained at 1000-1100°F (538-593°C), equalize, then cool in still air to 150 -125°F (66-51°C).

8. Tempering

  Temper immediately after quenching. Typical tempering range is 950-1050°F (510-566°C). Hold at temperature for 2 hours, then air cool to ambient temperature. Triple tempering is required.

9.HeatTreatment

Annealing:

Annealing must be performed after hot working and before re-hardening.

Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1500-1575°F (843-857°C), and hold for 1 hour per inch (25.4 mm) of thickness, minimum of 2 hours. Then cool slowly with the furnace at a rate not exceeding 50°F per hour (28°C per hour) to 1000°F (538°C). Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be 269 HBW or lower.

Forging

Preheat to 1200-1400°F (649-760°C) and equalize. Then heat rapidly to 2000-2100°F (1093-1149°C) and equalize prior to forging. Reheat if work piece temperature falls below 1800°F (982°C). After forging, cool slowly to ambient temperature in the furnace or buried in insulating material, then anneal as described above.

10.QualityCertificate

1)Grade,Size,Quantity in Number & Weight
2)Heat Number
3)Chemical Composition
4)Hardness
5)Ultrasonic Test Report.