T4 Vacuum Hardening Furnace

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T4 steel is a tungsten series general cobalt-containing high-speed steel. Compared with W18Cr4V, the red hardness and high temperature hardness are slightly higher, but the toughness is lower. After quenching, the surface hardness can reach 63-66HRC.

1. Features of T4 Steel

The characteristics of American T4 steel die steel, the American ASTM standard tungsten cobalt-containing high-speed tool steel, is made by adding 4.25% to 5.75% (mass fraction) of cobalt on the basis of W18Cr4V steel. Therefore, in addition to the properties of W18CrV4 steel, the addition of cobalt improves the high-temperature hardness and red hardness of the steel, so it can be used at higher temperatures. The steel does not have high toughness and is easy to grind.

2. Chemical Composition

Chemical composition	C	Si	Mn	P	S	Cr	Ni
Generally	0.70～0.80(	0.20～0.40	0.10～0.40	≤0.030	≤0.030	3.75～4.50	≤0.30

Chemical composition	Cu	V	Mo	W	Co
Generally	≤0.25	0.80～1.20	0.40～1.00	17.50～19.00	4.25～5.75

3. T4 Vacuum Heat Treatment

Heat treatment specification: quenching, preheating at 820～870℃,

1270～1290℃ (salt bath furnace) or 1280～1300℃ (box furnace) heating, oil cooling, 540～560℃ tempering 2 times, 2h each time.

Purpose: Quenching is generally to obtain a high-hardness martensite structure. Sometimes when quenching certain high-alloy steels (such as stainless steel, wear-resistant steel), it is to obtain a single-uniform austenite structure to improve resistance Abrasion and corrosion resistance.

Application points: ①. Generally used for carbon steel and alloy steel with a carbon content of more than 0.3%; ②. Quenching can give full play to the strength and wear resistance potential of steel, but at the same time it will cause a lot of internal stress , Reduce the plasticity and impact toughness of steel, so it is necessary to temper to obtain better comprehensive mechanical performance

4. Process Parameters of T4 Vacuum Quenching Furnace

Model	Temperature Uniform Size(W*H*L)	MAX. Temperature	Ultimate Pressure	Temperature Uniformity	Loading Capacity
VOGQ-446-2	400*400*600mm	1300℃	4*10-1Pa/6.7*10-3Pa	±5℃	200Kg
VOGQ-557-2	500*500*700mm	1300℃	4*10-1Pa/6.7*10-3Pa	±5℃	300Kg
VOGQ-669-2	600*600*900mm	1300℃	4*10-1Pa/6.7*10-3Pa	±5℃	500Kg
VOGQ-7710-2	700*700*1000mm	1300℃	4*10-1Pa/6.7*10-3Pa	±5℃	700Kg
VOGQ-8812-2	800*800*1200mm	1300℃	4*10-1Pa/6.7*10-3Pa	±5℃	1000Kg
VOGQ-9915-2	900*900*1500mm	1300℃	4*10-1Pa/6.7*10-3Pa	±5℃	1200Kg
Remark: The working zone of equipment could be customized base on customer’s production.

Shanghai Geheng Vacuum Technology Co., Ltd. is a vacuum heat treatment furnace manufacturer with many years of experience in design, manufacturing and production. Mainly produce vacuum heat treatment furnace, vacuum sintering furnace, vacuum brazing furnace, New Energy And Environmental Protection Equipment and other vacuum equipments.Provide customized services, equipment work area can be based on customer output.