AISI 8645 Alloy Steel (UNS G86450)

Jun 17 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Alloy steels consist of alloying elements such as manganese, silicon, nickel, titanium, copper, chromium and aluminum in varying amounts to enhance the properties of steel such as corrosion resistance, hardenability, formability, strength and weldability.

AISI 8645 alloy steel is a nickel-chromium-molybdenum steel. The following section will discuss about AISI 8645 alloy steel.

Chemical Composition

The chemical composition AISI 8645 alloy steels is outlined in the following table.

Element Content (%)
Iron, Fe 96.595 - 97.72
Manganese, Mn 0.75 - 1
Carbon, C 0.43 - 0.48
Nickel, Ni 0.40 - 0.70
Chromium, Cr 0.40 - 0.60
Silicon, Si 0.15 - 0.30
Molybdenum, Mo 0.15 - 0.25
Sulfur, S ≤0.040
Phosphorous, P ≤0.035

Physical Properties

The following table shows the physical properties of AISI 8645 alloy steels.

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

Mechanical Properties

The mechanical properties of AISI 8645 alloy steels are displayed in the following table.

Properties Metric Imperial
Tensile strength 1158 MPa 167953 psi
Yield strength 1034 MPa 149969 psi
Elongation 15% 15%
Bulk modulus 140 GPa 20300 ksi
Shear modulus 80 GPa 11600 ksi
Hardness, Brinell 184 - 235 184 - 235
Hardness, Vickers 220 220
Hardness, Knoop 239 239

Thermal Properties

The thermal properties of AISI 8645 alloy steels are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@0-100°C/32-212°F) 16-17 µm/m°C 8.8-9.4 µin/in°F
Thermal conductivity 16 W/mK 110.94 BTU.in/hrft².°F

Other Designations

Other designations that are equivalent to AISI 8645 alloy steels include the following:

  • SAE J404
  • SAE J412
  • SAE J770
  • ASTM A322
  • ASTM A331
  • ASTM A505
  • ASTM A519
  • MIL-SPEC MIL-S-16974

Tell Us What You Think

Do you have a review, update or anything you would like to add to this article?

Leave your feedback
(Logout)
Your comment type
Submit

Sponsored Content

Editorial Highlights

The Current State of the Global Semiconductor Market

The Current State of the Global Semiconductor Market

The global semiconductor market has entered an exciting period. Demand for chip technology is both driving the industry as well as hindering it, with current chip shortages predicted to last for some time. Current trends will likely shape the future of the industry, which is set to continue to show

How are Graphene Batteries Made?

How are Graphene Batteries Made?

The primary distinction between graphene-based batteries and solid-state batteries lies in the composition of either electrode. Although the cathode is commonly changed, carbon allotropes can also be employed in fabricating anodes.

Newsletters you may be interested in

See all Newsletters »

Terms

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.

Provide Feedback