Grade H20 Tool Steel (UNS T20820)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications

Introduction

The carbon content in tool steels may range from as low as 0.1% to as high as more than 1.6%, and many are alloyed with alloying elements such as vanadium, molybdenum and chromium.

The high amount of tungsten in the AISI H20 tool steel provides the maximum resistance to the softening effect of elevated temperature and offers excellent wear-resistant properties, including withstanding the washing-out effect of certain processes. The following article will provide an overview of grade H20 tool steels:

Chemical Composition

The chemical composition of H20 tool steels is outlined in the following table.

Element Content (%)
Tungsten, W 9-10
Chromium, Cr 1.80-2.20
Vanadium, V 0.4-0.6
Carbon, C 0.25-0.35
Silicon, Si 0.10-0.75
Manganese, Mn 0.10-0.4

Physical Properties

The following table shows the physical properties of H20 tool steels.

Properties Metric Imperial
Density 7.8 g/cm3 0.281 lb/in3

Mechanical Properties

The mechanical properties of H20 tool steels are displayed in the following table.

Properties Metric Imperial
Tensile strength 1110 MPa 160991 psi
Yield strength 800 MPa 116030 psi
Young’s modulus 180 GPa 26106 ksi
Hardness 35-42 35-42

Thermal Properties

The thermal properties of H20 tool steels are given in the following table

Properties Metric Imperial
Thermal expansion co-efficient (@100-250°C/212-482°F) 13 µm/m°C 5.956 µin/in°F
Thermal conductivity (@50°C/122°F) 15 W/mK 104 BTU.in/hrft².°F

Applications

The following are the list of applications of H20 tool steels:

  • Extrusion dies for long production runs
  • Hot piercing punches
  • Extrusion mandrels operated without cooling
  • Hot forging dies and inserts
  • Special structural steel for springs operating at elevated temperatures.

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