T8, T10 and T12 are carbon tool steels. They are very hard. The Brinell hardness in annealed state is more than 300.Manual saw blade is T12 material, just quenching, hardness is greater.10 and 20 are low carbon, high quality structural steel, very soft, Brinell hardness is less than 155.Therefore, the fitter saw, laborious, the saw is very easy to wear.

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T8-T10A hot rolled steel round bars information

Tool steels are high quality steels developed with controlled chemical composition to form properties essential for working and shaping of other materials. They are normally delivered to the suppliers in the soft annealed condition, which makes it easy for the manufacturer to machine the material with cutting tool for different applications.AISI T8 tool steel is a tungsten-cobalt-vanadium high-speed tool steel. The following datasheet will provide an overview of grade T8 tool steels.

Chemical and Mechanical

Chemical Composition

The chemical composition of T8 tool steels is outlined in the following table.

Element	Content (%)
Tungsten, W	13.25-14.75
Cobalt, Co	4.25-5.75
Chromium, Cr	3.75-4.5
Vanadium, V	1.80-2.40
Carbon, C	0.75-0.85
Molybdenum, Mo	0.4-1
Nickel, Ni	0.3
Copper, Cu	0.25
Manganese, Mn	0.2-0.4
Silicon, Si	0.2-0.4
Phosphorus, P	0.03
Sulfur, S	0.03

Physical Properties

The following table shows the physical properties of T8 tool steels.

Properties	Metric	Imperial
Density	8.43 g/cm3	0.267 lb/in3

Mechanical Properties

The mechanical properties of T8 tool steels are displayed in the following table.

Properties	Metric	Imperial
Tensile strength	1158 MPa	167.95 ksi
Elongation	15%	15%
Modulus of elasticity	190-210 GPa	27557- 30457 ksi
Poisson’s ratio	0.27-0.3	0.27-0.3

Thermal Properties

The thermal properties of T8 tool steels are given in the following table

Properties	Metric	Imperial
Thermal expansion co-efficient	16-17 µm/m°C	8.8-9.4 µin/in°F
Thermal conductivity	16 W/mK	110 BTU.in/hrft².°F

T8 Range of products

Product type	Products	Dimension	Processes	Deliver Status
Plates / Sheets	Plates / Sheets	0.08-200mm(T)WL	Forging, hot rolling and cold rolling	Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar	Round Bar, Flat Bar, Square Bar	Φ8-1200mm*L	Forging, hot rolling and cold rolling, Cast	Black, Rough Turning, Shot Blasting,
Coil / Strip	Steel Coil /Steel Strip	0.03-16.0x1200mm	Cold-Rolled & Hot-Rolled	Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes	Seamless Pipes/Tubes, Welded Pipes/Tubes	OD:6-219mm x WT:0.5-20.0mm	Hot extrusion, Cold Drawn, Welded	Annealed, Solution and Aging, Q+T, ACID-WASHED

Cross Reference Table(Equivalent Grade

Grade	Standard	Country	Application
T8	ASTM	USA	High-Speed Tool Steel

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Shandong Chengshun Metal Materials Co., Ltd. is located in Jinan City, Shandong Province. It is a comprehensive company dealing in high-quality steel products, with a superior geographical location and very convenient transportation. The company has a complete and scientific quality system, and has been recognized by the industry for its integrity, strength and product quality.

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Steel Round Bars