Metal Alloys
Alloy Home
Steels
Alloy Steels
General Information
Properties
Classification
Standard
H-Steels
HSLA
Alloy Steel List
AISI 1xxx
AISI 2xxx
AISI 3xxx
AISI 4xxx
AISI 5xxx
AISI 6xxx
AISI 8xxx
AISI 9xxx
* For other AISI or Non-AISI, please use the search function above or check Grades.
ASTM Steels
Specific Alloy Steel
General Information
Further Details
Resources
Bibliography
Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

more free publications

Materials

Design

Processes

Units

Formulas

Math
 
AISI 4140H
ConditionsHardness
T (°C)TreatmentMethodValue
25 annealed   HB 185-200 
25 annealed at 815°C   HB 197 
25 heat treated, oil-quenched, and tempered at 205°C   HB 520 
25 heat treated, oil-quenched, and tempered at 315°C   HB 455 
25 heat treated, oil-quenched, and tempered at 425°C   HB 385 
25 heat treated, oil-quenched, and tempered at 540°C   HB 320 
25 heat treated, oil-quenched, and tempered at 650°C   HB 255 
25 normalized at 870°C   HB 302 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 205°C   HB 578 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 260°C   HB 534 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 315°C   HB 495 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 370°C   HB 461 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 425°C   HB 429 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 480°C   HB 388 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 540°C   HB 341 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 595°C   HB 311 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 650°C   HB 277 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 705°C   HB 235 
Glossary
FREE Publications
Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

more publications