AISI 4145 Alloy Steel (UNS G41450)

Sep 17 2012

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Alloy steels are steels containing elements such as chromium, cobalt, nickel, etc. Alloy steels comprise a wide range of steels having compositions that exceed the limitations of Si, Va, Cr, Ni, Mo, Mn, B and C allocated for carbon steels.

In comparison with carbon steels, alloy steels are a lot more responsive to mechanical and heat treatments. Alloy steels can be subjected to unique melting and deoxidization processes for specific kind of applications.

The following datasheet provides an overview of AISI 4145 alloy steel.

Chemical Composition

The chemical composition of AISI 4145 alloy steel is outlined in the following table.

Element Content (%)
Iron, Fe 96.795-97.72
Chromium, Cr 0.800-1.10
Manganese, Mn 0.750-1.00
Carbon, C 0.430-0.480
Molybdenum, Mo 0.150-0.250
Silicon, Si 0.150-0.300
Sulfur, S ≤ 0.0400
Phosphorous, P ≤ 0.0350

Physical Properties

The following table shows the physical properties of AISI 4145 alloy steel.

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

Mechanical Properties

The mechanical properties of AISI 4145 alloy steel are displayed in the following table.

Properties Metric Imperial
Bulk modulus (typical for steels) 140 GPa 20300 ksi
Shear modulus (typical for steels) 80.0 GPa 11600 ksi
Elastic modulus 190-210 Gpa 27557-30458 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Hardness, Brinell 208 208
Hardness, Knoop (converted from Brinell hardness) 230 230
Hardness, Rockwell B (converted from Brinell hardness) 94 94
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) 15 15
Hardness, Vickers (converted from Brinell hardness) 218 218
Machinability (annealed and cold drawn, based on 100 machinability for AISI 1212 steel) 60 60

Thermal Properties

The thermal properties of AISI 4145 alloy steel are given in the following table.

Properties Metric Imperial
Thermal conductivity 42.6 W/mK 296 BTU in/hr.ft².°F

Other Designations

Equivalent materials to AISI 4145 alloy steel are given in the following table.

ASTM A29 ASTM A322 ASTM A331 ASTM A519 ASTMA711
ASTM A752 ASTM A829 SAE J1397 SAE J404 SAE J412
ASTM A505 SAE J770 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