Grade A11 Tool Steel (UNS T30111)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat treatment
     Machinability
     Forging
     Annealing
Stress Relieving
Tempering
Applications

Introduction

Tool steels are a kind of carbon and alloy steels that are well-suited for manufacturing tools. They are usually used in a heat-treated state. With a carbon content between 0.7 and 1.5%, tool steels are manufactured under carefully controlled conditions to produce the required quality. Tool steels are available in a number of grades for different applications.

AISI A11 tool steel is a high vanadium tool steel having wear resistance greater than most of the other tool steels, as well as good toughness and strength. It has improved response to heat treatment, easy grinding process and an expansion of about 0.0004 inches upon heating.

The data below will provide an overview of grade A11 tool steels.

Chemical Composition

The chemical composition of A11 tool steels is outlined in the following table.

Element Content (%)
Iron, Fe 78.21 - 81.35
Vanadium, V 9.25 - 10.25
Chromium, Cr 4.75 - 5.75
Carbon, C 2.4 - 2.5
Molybdenum, Mo 1.1 - 1.5
Silicon, Si 0.75 - 1.1
Manganese, Mn 0.35 - 0.6
Sulfur, S 0.050 - 0.090

Physical Properties

The following table shows the physical properties of A11 tool steels.

Properties Metric Imperial
Density 7.39 g/cm3 0.267 lb/in3
Melting point 1450 - 1510°C 2642 - 2750°F

Mechanical Properties

The mechanical properties of A11 tool steels are displayed in the following table.

Properties Metric Imperial
Tensile strength 5205 MPa 754900 psi
Modulus of elasticity 200 GPa 29000 ksi
Hardness, Rockwell C 59 59
Abrasion 12 12
Izod impact unnotched 39.3 J 29 ft.lb

Thermal Properties

The thermal properties of A11 tool steels are given in the following table

Properties Metric Imperial
Thermal expansion co-efficient (@21-100°C/69.8-212°F) 10.72 µm/m°C 5.956 µin/in°F

Fabrication and Heat treatment

Machinability

The machinability of A11 tool steels in the annealed condition can be rated between 35 and 40%.

Forging

A11 tool steels are slowly heated at 1093 - 1149°C (2000 - 2100°F). The forgings are then cooled slowly and annealed immediately upon cooling.

Annealing

A11 tool steels are heated at 871 - 899°C (1600 -1650°F) for 2 hours and cooled to 538°C (1000°F).

Stress Relieving

To relieve machining stresses, A11 tool steels are heated to a temperature of 621 - 677°C (1150 - 1250°F) and then slowly cooled in still air.

Tempering

A11 tool steels are immediately tempered after the completion of the quenching. Tempering is usually performed in the temperature range of 538 - 593°C (1000 - 1100°F).

Applications

The following are the list of applications of A11 tool steels:

  • Steel mill rolls
  • Pelletizer blades
  • Woodworking tools
  • Cold extrusion liners
  • Plastic injection molds
  • Slitter knives
  • Blanking dies and piercing dies.

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