H14 Tool Steel - Chromium Hot-Work Steels

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Chromium hot-work tool steels are designated as group H steels according to the AISI classification system. This series of steels start from H1 to H19.

H14 chromium hot-work steel has had tungsten added for improved high-temperature properties and a high heat resistance. It exhibits little size change during hardening and is suitable for long-run die castings dies. 

This article will provide an overview of H14 chromium hot-work steels.

Chemical Composition

The following table shows the chemical composition of H14 tool steels.

Element Content (%)
C 0.35-0.45
Mn 0.20-0.50
Si 0.80-1.20
Cr 4.75-5.50
Ni 0.3
Cu 0.25
P 0.03
S 0.03
W 4.00-5.25

Physical Properties

The physical properties of H14 tool steels are given in the following table.

Properties Metric Imperial
Density 7.89 g/cm3 0.285 lb/in3

Mechanical Properties

The mechanical properties of H14 tool steels are tabulated below.

Properties Metric Imperial
Hardness, Rockwell C (air cooled from 982°C, 30 mins) 52 52
Hardness, Rockwell C (air cooled from 1010°C, 30 mins) 55 55
Hardness, Rockwell C (air cooled from 1038°C, 30 mins) 56 56
Modulus of elasticity 207 GPa 30000 ksi
Charpy impact (V-notch; air cooled from 1010°C; 490°C temper temperature) 12.9 J 9.50 ft-lb
Charpy impact (V-notch; air cooled from 1010°C; 370°C temper temperature) 16.3 J 12.0 ft-lb
Charpy impact (V-notch; air cooled from 1010°C; 650°C temper temperature) 17.6 J 13.0 ft-lb
Machinability (1% carbon steel) 70.0 - 75.0% 70.0 - 75.0%
Poisson's ratio 0.27-0.30 0.27-0.30

Thermal Properties

The following table shows the thermal properties of H14 tool steels.

Properties Conditions
T (°C) Treatment
Thermal expansion 11 x 10-6/ºC 20-100 -

Other Designations

Other designations that are equivalent to H14 tool steels include:

  • ASTM A681
  • FED QQ-T-570
  • UNS T20814

 

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