Grade H25 Tool Steel (UNS T20825)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications

Introduction

Tools steels are special steels used to cut or change the shape of a material into a semi-finished or finished product. With a carbon content between 0.7% and 1.5%, tool steels are manufactured under carefully controlled conditions to produce the desired quality.

AISI H25 tool steel is a tungsten hot work steel having excess carbides, which make them hard and wear-resistant. The following datasheet will provide an overview of grade H25 tool steels.

Chemical Composition

The chemical composition of H25 tool steels is outlined in the following table.

Element Content (%)
Tungsten, W 14-16
Chromium, Cr 3.75-4.5
Vanadium, V 0.4-0.6
Nickel, Ni 0.3
Copper, Cu 0.25
Carbon, C 0.22-0.32
Manganese, Mn 0.15-0.4
Silicon, Si 0.15-0.4
Phosphorus, P 0.03
Sulfur, S 0.03

Physical Properties

The following table shows the physical properties of H25 tool steels.

Properties Metric Imperial
Density 7.7-8.03 g/cm3 0.278 – 0.290 lb/in3
Melting point 1370-1400°C 2498-2552°F

Mechanical Properties

The mechanical properties of H25 tool steels are displayed in the following table.

Properties Metric Imperial
Tensile strength 1158 MPa 167.95 ksi
Yield strength 1034 MPa 150 ksi
Elongation 15% 15%
Modulus of elasticity 190-210 GPa 27557- 30457 ksi
Poisson’s ratio 0.27-0.3 0.27-0.3
Hardness (@25°C) 335 335

Thermal Properties

The thermal properties of H25 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

Other Designations

The equivalent materials to H25 tool steels include the following:

  • ASTM A681
  • FED QQ-T-570

Applications

The following are the list of applications of H25 tool steels:

  • Extrusion and hot forging dies
  • Hot piercing punches
  • Special structural steel

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