HY80 Alloy Steel

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Heat Treatment
     Forging
     Hot Working
     Cold Working
     Annealing
     Tempering
     Hardening
Applications

Introduction

Alloy steels are designated by AISI four-digit numbers. They are more responsive to mechanical and heat treatments than carbon steels. They comprise different types of steels with compositions which exceed the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va in the carbon steels.

The datasheet given below provides more details about HY80 alloy steel, which has good ductility and excellent notch toughness and weldability.

Chemical Composition

The chemical composition of HY80 alloy steel is listed in the following table.

Element Content (%)
Iron, Fe 93.1 - 96.4
Nickel, Ni 2.0 - 3.25
Chromium, Cr 1.0 - 1.80
Copper, Cu ≤ 0.25
Molybdenum, Mo 0.20 - 0.60
Silicon, Si 0.15 - 0.35
Carbon, C 0.12 - 0.18
Manganese, Mn 0.10 - 0.40
Phosphorous, P ≤ 0.025
Sulfur, S ≤ 0.025
Titanium, Ti ≤ 0.020
Vanadium, V ≤ 0.030

Physical Properties

The following table shows the physical properties of HY80 alloy steel.

Properties Metric Imperial
Density 7.87 g/cc 0.284 lb/in³
Melting point 1424°C 2595°F

Mechanical Properties

The mechanical properties of HY80 alloy steel are outlined in the following table.

Properties Metric Imperial
Tensile strength, yield ≥ 552 MPa ≥ 80000 psi
Modulus of elasticity (typical of steel) 205 GPa 29700 ksi
Shear modulus (typical of steel) 80 GPa 11600 ksi
Poissons ratio (calculated) 0.28 0.28

Other Designations

Other designations that are equivalent to HY80 alloy steel include the following:

  • MIL S-16216
  • MIL S-21952

Fabrication and Heat Treatment

Machinability

HY-80 steel can be machined in the quenched and tempered condition.

Forming

HY-80 may be readily cold or hot formed by conventional bending, or forming, processes.

Welding

HY-80 steel can be efficiently heated with metal-arc process using low hydrogen electrodes of type E-11018 or E-10018. HY 80 steel, except for heavy section, does not require pre-heating. Post-heating is not required.

Heat Treatment

Heat treatment is not required for HY-80 steel as it is supplied in quenched and tempered conditions. If necessary, it may be heated at 649°C (1200°F) for 1 h followed by slow furnace cooling and air cooling.

Forging

HY-80 alloy steel should not be reheated for forging as it is supplied in the heat treated and tempered condition.

Hot Working

Hot working of HY-80 steel can be performed at temperatures ranging between 93 and 316°C (200 and 600°F).

Cold Working

HY-80 steel can be cold worked using conventional methods.

Annealing

HY-80 steel can be annealed at 649°C (1200°F) and then furnace cooled at a temperature ranging from 93 to 260°C (200 to 500°F).

Tempering

HY-80 steel is tempered with 80 ksi minimum yield strength.

Hardening

HY-80 steel can be hardened by cold working.

Applications

HY-80 alloy steel is best suited for use in shipbuilding for welded hull plates.

Date Added: Sep 5, 2012 | Updated: Aug 9, 2013
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