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All Categories > Alloyed Bars and Plates > Aircraft Alloy Steels > Cold Finished Aircraft Alloy Bars > 4140 Aircraft Alloy Bars > 4140 Aircraft Annealed & Cold Finished Alloy - Flats > Size 1/2 x 5  
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Size 1/2 x 5, 4140 Aircraft Annealed & Cold Finished Alloy - Flats



This chromium molybdenum alloy is a deep hardening steel used where strength and impact toughness are required. It has high fatigue strength making it suitable for critical stressed applications at normal as well as elevated temperatures. For increased resistance to wear and abrasion, it may be nitrided.
This grade is a quality product melted under the best of steelmaking practices for aircraft quality steels. It is vacuum degassed to meet the magnetic particle inspection standards of AMS 2301.

UNS G41400, MIL-S-5626 - AMS 6382 - AMS 2301

Color Marking:
Normalized Bars—Ends painted Gray
Annealed Bars—Ends painted Brown

Physical Conditions C
Surface Condition 4

Stock Lengths: 12' Approx.

Maximum Brinell 241





Specifications  · Analysis  · Applications  · Hardening  · Heat Treating

Specifications

Estimated Weight per Foot

8.508 lb

Estimated Weight 12-Ft. Bar

102.1 lb


Analysis
Carbon .38/.43
Manganese .75/1.00
Phosphorus .025 Max.
Sulphur .025 Max.
Si. .20/.35
Cr. .80/1.10
Mo. .15/.25




Applications
Intended for general use for parts with sections 1/2" or less in thickness at time of heat treatment which require a through-hardening steel capable of developing hardness as high as Rockwell "C" 50; also for fittings and forgings of greater hardness or variation in thickness at proportionately lower hardnesses. It is frequently used in applications in which 8640 (MIL- S-6049) is specified.



Hardening
End-quench hardenability values for this grade are Rockwell "C" 50 minimum at 6/16" and Rockwell "C" 44 minimum at 9/16"



Heat Treating
Normalize— 1600°/1700°F
Austenitize—1525°/1600°F
Quench—Oil
Temper—700°/1300°F




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