Grade T7 Tool Steel (UNS T12007)

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Introduction
Tool steels are a type of carbon and alloy steels that are used for tool manufacturing applications. They have resistance to abrasion and deformation at elevated temperatures, distinct hardness and an ability to hold a cutting edge.

AISI T7 tool steel acquires high strength, toughness and the ability to withstand vibration and shock when quenched and tempered.
The data below will provide an overview of grade T7 tool steels.

Chemical Composition
The chemical composition of T7 tool steels is outlined in the following table.

Element	Content (%)
Tungsten, W	13.5-14.5
Chromium, Cr	4.5-5
Vanadium, V	1.5-1.8
Carbon, C	≤ 0.7-0.75
Silicon, Si	≤ 0.2-0.4
Manganese, Mn	≤ 0.2-0.4

Physical Properties
The following table shows the physical properties of T7 tool steels

Properties	Metric	Imperial
Density	7.7 g/cm3	0.278 lb/in3
Melting point	1450 � 1510�C	2642 � 2750�F

Mechanical Properties
The mechanical properties of T7 tool steels are displayed in the following table

Properties	Metric	Imperial
Tensile strength	650-880 MPa	94274 -127663psi
Yield strength	350-550 MPa	50763-79770
Young�s modulus	200000 MPa	29007.5 ksi
Elongation at break	8-25%	8-25%

Thermal Properties
The thermal properties of T7 tool steels are given in the following table

Properties	Metric	Imperial
Thermal expansion co-efficient	10 µm/m°C	5.5 µin/in°F
Thermal conductivity	25 W/mK	173.3 BTU.in/hrft².°F

Applications
The following are the list of applications of T7 tool steels:
Chisels, Small pneumatic tools, Forging die, Rivets, Carpenter saws and Metal scissors.