How to Buy T4 Steel? | T4 Steel Buying Guide

China’s best manufacturer, wholesaler and distributor of AISI T4 High Speed Tool Steel. WALDUN is one of the largest steel companies and suppliers in China that specialized in  T4 steel manufacturing. We supply a round bar, square bar, flat bar, plate, sheet and wire.

If you are looking for more information about T4 steel or the pricing then you are at the right place. Offering you the best quality T4 high speed tool steel at an affordable price is our priority. However, we also supply other high speed tungsten type of tool steel from T1 to 15, feel free to reach us for enquire.

What is T4 Steel?

T4 steel popularly known as AISI T4 steel is a high speed tool steel, a standard of high-speed steel tool materials for ASTM A600. T1 Tool Steel materials are similar to ASTM T4 tool steel but cobalt has increased by 4.25 ~ 5.75% for an improvement in thermal durability.

T4 steel has a red hardness and a higher heat hardness than T1 tool steel.  However, before they can be used, T4 tool steel must be produced in the desired form.

They are solid, resistant to wear, machinery and decarburization resistant.

High-speed steels are strong and heavy, but usually have less toughness than cold work tool steels. Some of them, especially M2 and M4 powder metal, are used for cold work due to their strength and wear resistance. In order to qualify as a high-speed steel, certain minimum specifications specified in ASTM A600 High Speed Tool Steels must be fulfilled in the chemical composition.

What is the meaning of AISI and ASTM

T4 steel also belongs to the AISI steels which represent the American Iron and Steel Institute, this explains why AISI is attached to the name of this steel. So don’t be confused when you see AISI or ASTM T5 steel they are the same.

ASTM on the other hand stands for American Society for Testing and Materials. The most commonly used standards for steel products are those published by ASTM in the United States (American Society for Testing and Materials).

ASTM specifications represent a consensus among steel mill products manufacturers, specifications, manufacturers and users. The T represents the Tungsten tool steels while the 4 helps to differentiate the steel type from other models since the steel T series ranges from T1 to T15.

WALDUN T4 Steel Supply Form,  Size & Tolerance

You are assured of the best quality T4 steel that can be used for different applications. However, below are the supply form, size and tolerance which helps to understand Waldun steel T4 steel round bar and flat bar specifications. We can as well customize the Tolerance as per your requests.

Round bar
Diameter	1-16mm	10-50mm	50-180mm	180-300mm
Process	Cold Drawn	Hot Rolled	Hot Forged	Free Forging
Flat bar
Thickness	1-2.5mm	1.5-20mm	20-300mm
Width	Max 800mm	Max 800mm	Max 800mm
Process	Cold Drawn	Hot Rolled	Hot Forged

T4 steel Chemical Composition

In the following table you can see the chemical composition of T4 tool steels.

Element	Content (%)
Tungsten, W	17.5 – 19
Cobalt, Co	4.25 – 5.75
Chromium, Cr	3.75 – 4.5
Vanadium, V	0.8 – 1.2
Carbon, C	0.7 – 0.8
Molybdenum, Mo	0.4 – 1
Silicon, Si	0.2 – 0.4
Manganese, Mn	0.1 – 0.4
Phosphorus, P	0.03 max
Sulfur, S	0.03 max
Iron, Fe	Balance

T4 Steel Physical Properties

The table below shows the physical properties of T4 tool steels.

Density, g/cm3	8.68
Melting point,°C	1432
Thermal conductivity, W/m.K	19
Electric resistivity,Ohm mm2/m	0.65
Specific heat capacity,J/g.K	0.46
Thermal expansion co-efficient,µm/m°C	11.9

T4 Steel Mechanical Properties

The mechanical properties of T4 tool steels are shown in the table below

Modulus of elasticity	190-210 GPa
Poisson’s ratio	0.27-0.30

T4 Steel T4 Steel Forging

There are two phases before heating the AISI T4. Heat steadily at 860-900°C slowly and uniformly at not over 220°C per hour, and heat faster to the 1050-1150°C forging temperature.

When the temperature is below 900°C, reheating is required. After forging, slow cooling in the oven.

T4 Steel Annealing

Annealing after hot work and rehardening must be carried out.

Heat the temperature at a speed of not more than 220°C per hour at 820 to 850°C.

Controlled furnace slow cooling at approx. 550°C at 10 to 20°C an hour, followed by quiet air cooling. After 265 Brinell’s anneal, full hardness.

T4 Steel Stress Relieving

After processing and prior to hardening, stress relief is advised to minimize distortion.

Heat to 600 to 650°C in a neutral atmosphere and soak for about two hours, followed by a gradual cooling in the furnace.

T4 Steel Hardening

Preheat AISI T4 steel slowly to a temperature of 820-870°C, then uniformly heat to 1260-1290°C, accompanied by oil, air quenching, or a warm bath at 550°C.

T4 Steel Tempering

Tempering should be done as soon as possible after quenching.

Heat to the tempering temperature of 560-580oC slowly and evenly, then soak for at least 2 hours (one hour per 25mm of total thickness).

Double tempering is recommended, with a hardness of 64-65 HRC after tempering.

T4 Steel Applications

AISI T4 High-speed tool steel has been commonly used in rough work for cutting tools, broaches and cold extruders.

The following are examples of typical applications:

• Drills,
• Milling Cutters,
• Thread Cutting Tools,
• Knurling Tools,
• Cold extrusion punches
• Broaches etc.

Why you should buy T4 Steel from Waldun Steel

We are the biggest manufacturer and supplier of T4 steels in China, we also supply different types of steels at an affordable price. Apart from the ASTM/AISI T4 high speed tool steel materials, we are also capable of supplying T1 high speed steel, T5 tool steels, 1055 tool steel etc. You can trust us for high-quality steels and fast deliveries

For orders and enquiries

Simply contact us using the details below for the latest price and offer.

• Mobile: +8618652469606
• Email: iguhongtao@gmail.com