Grade H20 Tool Steel (UNS T20820)

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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	09-Oct
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 tab

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	13 �m/m�C	5.956 �in/in�F
Thermal conductivity	15 W/mK	104 BTU.in/hrft�.�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.