AISI 5160 Alloy Steel (UNS G51600)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Welding
     Heat Treatment
     Forging
     Annealing
Applications

Introduction

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

The following datasheet will provide more details about AISI A5160 alloy steel, which has high ductility, excellent toughness and high tensile-yield ratio.

Chemical Composition

The chemical composition of AISI 5160 alloy steel is listed in the following table.

Element Content (%)
Iron, Fe 97.085 - 97.84
Manganese, Mn 0.750 - 1
Chromium, Cr 0.7 - 0.9
Carbon, C 0.560 - 0.640
Phosphorous, P ≤ 0.0350
Silicon, Si 0.150 - 0.3
Sulfur, S ≤ 0.04

Physical Properties

The following table shows the physical properties of AISI 5160 alloy steel.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³

Mechanical Properties

The mechanical properties of AISI 5160 alloy steel are outlined in the following table.

Properties Metric Imperial
Tensile strength, ultimate 724 MPa 105000 psi
Tensile strength, yield 275 MPa 39900 psi
Modulus of elasticity 190-210 GPa 27557-30458 ksi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steels) 80 GPa 11600 ksi
Poissons ratio 0.27 – 0.30 0.27-0.30
Elongation at break (in 50mm) 17.20% 17.20%
Hardness, Brinell 197 197
Hardness, Knoop (converted from Brinell hardness) 219 219
Hardness, Rockwell B (converted from Brinell hardness) 92 92
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) 13 13
Hardness, Vickers (converted from Brinell hardness) 207 207
Machinability (spheroidized annealed and cold drawn. Based on 100% machinability for AISI 1212 steel) 55 55

Thermal Properties

The thermal properties of AISI 5160 alloy steel are outlined in the following table.

Properties Metric Imperial
Thermal conductivity 46.6 W/mK 323 BTU in/hr.ft2. °F

Other Designations

Other designations that are equivalent to AISI 5160 alloy steel include the following:

  • ASTM A29
  • ASTM A322
  • ASTM A331
  • ASTM A505
  • ASTM A519
  • ASTM A752
  • ASTM A829
  • SAE J1397
  • SAE J404
  • SAE J412
  • SAE J770

Fabrication and Heat Treatment

Machinability

Machining 5160 alloy steel is difficult in “as rolled” condition. Hence, the steel should be annealed before machining to obtain maximum speeds.

Welding

AISI 5160 alloy steel has poor welding property owing to its high chromium and carbon content. Either arc or gas welding methods can be used to weld the steel.

Heat Treatment

AISI 5160 alloy steel is generally hardened using oil. This steel is quenched at 829°C (1525°F) and tempered at temperatures ranging from 427 and 704°C (800 and 1300°F).

Forging

Forging of 5160 alloy steel is performed at temperatures between 1149 and 1204°C (2100 and 2200°F).

Annealing

AISI 5160 alloy steel is annealed at 788°C (1450°F) and then air cooled.

Applications

AISI 5160 alloy steel is suitable for manufacturing leaf springs used in automotive field.

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