T4 High Speed Steel
AISI T4 steel is a Tungsten-cobalt high speed tool steel according to ASTM standard.T4 HSS is similar to T1 high-speed steel but with added 5% cobalt to increase heat resistance.The red hardness of T4 steel and the high temperature hardness is a little higher than T1 tool steel.But the toughness is low, after quenching, surface hardness will be 63-66HRC.
Carbon: 0.70/0.80; Chromium: 3.75/4.50; Molybdenum:0.40/1.00;
Vanadium: 0.80/1.20; Tungsten: 17.50/19.00; Cobalt:4.25/5.75;
3.Form & Size
1)Fuhongsteel are manufacturers and suppliers of T4 High-Speed Steel round bars, flat/square bars,plates,sheets,etc.
2)T4 High Speed Tool Steel Size Available(Length can be customized):
dia. 1-16mm(cold draw);
dia. 10-50mm(hot rolled);
dia. 50-180mm(hot forged);
dia. 180-300mm(free forging);
Thickness: 1-2.5mm(cold rolled); 1.5-20mm(hot rolled); 20-300mm(hot forged);
Width: Max 800mm;
5.AISI T4 HSS Steel Applications
T4 high speed steel is widely used in high-speed cutting tool, tools on automation machine, and high strength material.
1)Preheat T4 high speed steel uniformly and slowly to 860-880°C.
2)Increase the forging temperature up to 1050-1120°C.
3)T4 tool steel should be cooled very slowly after forging.
T4 steel should be annealed after hot working. Increase the temperature of T4 high speed steel to 860°C(Max220°C per hour). Hold at the temperature and then cool slowly with the furnace. The annealed hardness achieved should be below HB255.
1)Preheat the T4 hss steel to 500°C ;
2)Then increase the temperature until 880-900°C;
3)Heating the hardening temperature around 1200°C;
4)T4 high speed steel must be heated throughly;
5)Quench in the warm oil,and then complete the quench;
6) T4 tool steel is suitable for vacuum hardening,too.
1)Temper AISI T4 high-speed steel immediately after quenching;
2)Heat thoroughly and uniformly to the tempering temperature;
3)Hold for at least two hours (one hour per about 25mm);
4)Triple tempering is strongly recommended for T4 tool steel.
Enquiry for AISI T4 high speed steel round rods, flat/square bars, plates,sheets and blocks.