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Carbon		0.7 - 0.8
Chromium		3.75 - 4.5
Cobalt		4.25 - 5.75
Iron		Balance
Manganese		0.1 - 0.4
Molybdenum		0.4 - 1
Phosphorus		0.03 max
Silicon		0.2 - 0.4
Sulphur		0.03 max
Tungsten		17.5 - 19
Vanadium		0.8 - 1.2

Principal Design Features		This alloy is a High Speed, tungsten type tool steel. It is a deep hardening alloy capable of Rockwell C 64 hardness.

Applications		Generally used as cutting tools, broaches and cold extrusion punches.

Machinability		Machinability of T4 is only fair. It ranks as 55% that of the W group water hardening simple tool steels.

Forming		The alloy has good ductility in the annealed condition and may be formed by conventional means.

Welding		The alloy may be welded but has a high tungsten content. Consult the alloy supplier for information relative to welding methods.

Heat Treatment		Preheat to 1550 F and then heat rapidly to 2325 F. Hold parts for 2 to 5 minutes at 2325 F and then quench in oil, salt bath or air.

Forging		Forge at 2100 F down to 1775 F. Do not forge below 1750 F.

Hot Working		See "Forging".

Cold Working		In the annealed condition the alloy may be cold worked by conventional methods.

Annealing		Anneal at 1625 F and slow cool at a maximum of 40 F per hour in the furnace.

Aging		Not applicable to this alloy

Tempering		Temper at 1000 to 1100 F for Rockwell C of 66 to 62.

Hardening		See "Heat Treating" and "Tempering".

Other Comments		This alloy hardens well but is seldom used in large sections over 3" thick or diameter.

Physical Data : [top]

Density (lb / cu. in.)	0.313
Specific Gravity	8.67
Melting Point (Deg F)	2610
Modulus of Elasticity Tension	30

MSO currently has no data available for this grade.