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AISI 4140H
Conditions Tensile Properties 
T (°C)Treatment
25 annealed   Tensile Strength (MPa) 655 
Yield Strength (MPa) 485 
Elongation (%) 26 
Reduction in Area (%) 52 
25 annealed at 815°C   Tensile Strength (MPa) 655 
Yield Strength (MPa) 420 
Elongation (%) 25.7 
Reduction in Area (%) 57 
25 heat treated, oil-quenched, and tempered at 205°C   Tensile Strength (MPa) 1795 
Yield Strength (MPa) 1515 
Elongation (%)
Reduction in Area (%) 32 
25 heat treated, oil-quenched, and tempered at 315°C   Tensile Strength (MPa) 1585 
Yield Strength (MPa) 1345 
Elongation (%) 11 
Reduction in Area (%) 40 
25 heat treated, oil-quenched, and tempered at 425°C   Tensile Strength (MPa) 1380 
Yield Strength (MPa) 1170 
Elongation (%) 15 
Reduction in Area (%) 48 
25 heat treated, oil-quenched, and tempered at 540°C   Tensile Strength (MPa) 1140 
Yield Strength (MPa) 965 
Elongation (%) 18 
Reduction in Area (%) 56 
25 heat treated, oil-quenched, and tempered at 650°C   Tensile Strength (MPa) 931 
Yield Strength (MPa) 793 
Elongation (%) 22 
Reduction in Area (%) 63 
25 normalized at 870°C   Tensile Strength (MPa) 1020 
Yield Strength (MPa) 655 
Elongation (%) 17.7 
Reduction in Area (%) 47 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 205°C   Tensile Strength (MPa) 1965 
Yield Strength (MPa) 1735 
Elongation (%) 11 
Reduction in Area (%) 42 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 260°C   Tensile Strength (MPa) 1860 
Yield Strength (MPa) 1655 
Elongation (%) 11 
Reduction in Area (%) 44 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 315°C   Tensile Strength (MPa) 1725 
Yield Strength (MPa) 1572 
Elongation (%) 11.5 
Reduction in Area (%) 46 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 370°C   Tensile Strength (MPa) 1595 
Yield Strength (MPa) 1460 
Elongation (%) 12.5 
Reduction in Area (%) 48 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 425°C   Tensile Strength (MPa) 1450 
Yield Strength (MPa) 1345 
Elongation (%) 15 
Reduction in Area (%) 50 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 480°C   Tensile Strength (MPa) 1295 
Yield Strength (MPa) 1205 
Elongation (%) 16 
Reduction in Area (%) 52 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 540°C   Tensile Strength (MPa) 1150 
Yield Strength (MPa) 1050 
Elongation (%) 17.5 
Reduction in Area (%) 55 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 595°C   Tensile Strength (MPa) 1020 
Yield Strength (MPa) 910 
Elongation (%) 19 
Reduction in Area (%) 58 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 650°C   Tensile Strength (MPa) 896 
Yield Strength (MPa) 786 
Elongation (%) 21 
Reduction in Area (%) 61 
25 normalized at 870°C, reheated to 845°C, quenched in oil, tempered at 705°C   Tensile Strength (MPa) 807 
Yield Strength (MPa) 689 
Elongation (%) 23 
Reduction in Area (%) 65 
Glossary
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.

3D Scanners

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