Our Metal Stock

Useful Steel Data

CLICK THE SIGN BELOW FOR PHOTOS

Metal Stock Inc. Aluminum, Brass, Carbon, Alloy Steels

Business Hours:
Monday - Friday
8:00 a.m. until 5:00 p.m.

Need A Quick Quote?
Click the button below.


Metal Stock, Inc.


We carry seamless and welded stainless steel and carbon steel pipe. Check out our inventory of steel tubing and piping.

Click the link below to download a printable PDF reference of seamless and welded pipe data
.

Pipe Dimensions PDF.


4340:

BACK TO ALLOY STEEL BARS PAGE

Disclaimer: The content of this page is for general information only and is not to be used for engineering or design. The content of this material specification page was compiled from available public sources and authorities on material properties. Although we believe the information to be corrrect, Metal Stock, Inc. is not responsible for the accuracy of any of the material specifications and only presents this data as general information for our customers.

4340 Annealed: Because of richer alloy content, 4340 possesses much deeper hardenability than the 4100 series. This advantage is realized principally where high strength is required in heavy sections. In addition, unusually high hardenability ensures maximum toughness and ductility at the desired strength level. The fatigue-tensile ratio makes this grade ideal for highly stressed parts. It maintains its strength, ductility, and toughness at relatively high temperatures. It has remarkable non-distorting properties for an alloy steel. Thus, for high strength in heavy sections, for highly stressed parts operating under the most severe conditions, or where the greatest margin of safety is desired, this is the steel to use.

General Information about 4340:


APPLICATIONS:

4340 can be used in automotive and marine crank shafts, diesel engine crank shafts and other heavy-duty shafting, axle shafts, dies, subs, gear shafts, gears, mine-drilling parts, oil-well fishing tools, perforating gun bodies, etc.

MACHINING AND WELDING:

4340 has a machinability rating in the annealed condition of approximately 57% of 1212. Surface cutting speed is approximately 95 feet per minute. 4340 is difficult to weld, but can be welded by any of the common welding processes, providing the section is preheated and stress relieved after welding. The grade of welding rod to be used depends upon thickness of section, design, service requirements, etc.

HEAT TREATING - Forging, Normalizing and Annealing:

Forging:
Heat to 2200º - 2300ºF.

Normalizing:
Heat to 1600º - 1700ºF. Cool in air. Average Brinell Hardness is 363.

Annealing:
Heat to 1500º - 1600ºF. Cool slowly in furnace. Average Brinell Hardness is 197.

Hardening:
Standard hardening range is between 1475º - 1575º F. Quench in oil. A wide range of mechanical properties can be obtained by tempering between 400º and 1200ºF.

 

BACK TO ALLOY STEEL BARS PAGE


Site By: Thierry Boehm 2012 | Photos and Videos By: Randy Boehm