Grade T7 Tool Steel (UNS T12007)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications

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
  • Metal scissors.

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