Metal Alloys
Alloy Home
Steels
Stainless Steels
General Information
Properties
Stainless Stl. Grades
Austenitic
Martensitic
Ferritic
Precipitation Hardening
Stainless Steel List
AISI Type 2xx
AISI Type 3xx
AISI Type 4xx
AISI Type 5xx
AISI Type 6xx
* For other AISI or Non-AISI, please use the search function above or check Grades.
Specific Stainless Stl
General Information
Resources
Bibliography
STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

more free publications
 
AISI 4042
Category Steel
Class Alloy steel
Type Standard
Common Names Molybdenum steel
Designations  United States: ASTM A322 , ASTM A331 , ASTM A519 , SAE J404 , SAE J412 , SAE J770 , UNS G40420

Composition
ElementWeight %
C  0.40-0.45 
Mn  0.70-0.90 
P  0.035 (max) 
S  0.04 (max) 
Si  0.15-0.30 
Mo  0.20-0.30 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.7-8.03 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  
Tensile Strength (Mpa) 1800  25  oil quenched, fine grained, tempered at 205°C  more
Yield Strength (Mpa) 1662 
Elongation (%) 12 
Reduction in Area (%) 37 
Hardness (HB) 516  25  oil quenched, fine grained, tempered at 205°C more
Glossary
STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.