P2 Tool Steel - Low-Carbon Mold Steel (UNS T51602)

Sep 11 2012

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Low-carbon mold steels or group P steels comprise different types that include P2, P3, P4, P5, P6, P20, and P21 steels. Chromium and nickel are the main alloying elements found in group P steels.

P2 tool steels are carburizing steels manufactured according to tool steel quality standards. The sections below provide an overview of P2 tool steels.

Chemical Composition

The chemical composition of P2 tool steels is outlined in the following table.

Element Content (%)
C 0.10
Mn 0.10-0.40
Si 0.10-0.40
Cr 1.25-1.75
Ni 0.10-0.50
Mo 0.15-0.40
Cu 0.25
P 0.03
S 0.03

Physical Properties

The following table shows the physical properties of P2 tool steels.

Properties Metric Imperial
Density 7.86 g/cm3 0.284 lb/in3

Mechanical Properties

The mechanical properties of P2 tool steels are displayed in the following table.

Properties Metric Imperial
Hardness, Rockwell C 58.0-64.0 58.0-64.0
Poisson's ratio 0.27-0.30 0.27-0.30
Elastic modulus 190-210 GPa 27557-30457 ksi

Thermal Properties

The thermal properties of P2 tool steels are given in the following table.

Properties Conditions
T (°C) Treatment
Thermal expansion 13.7 x 10-6/ºC 20-425 -

Other Designations

Equivalent materials to P2 tool steels are:

  • ASTM A681
  • UNS T51602

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