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  INFORMATION - CASTING vs FORGED  
 

Benefits of purchasing steel castings from Southwest Steel Casting Company verses the use of forged steel parts.

 
 
     Relative Properties  
 
WELDABILITY:

Steel castings tend to have better weldability than steel forgings.

PART GEOMETRIES:
Steel castings lend themselves more easily to complex shapes than do steel forgings.

CHEMICAL REQUIREMENTS:
Unique chemistries tend to be better (less expensively produced) with steel castings. Also, the class of steels commonly referred to as “work-hardenable steels” (13% Mn) are not forgeable, but are readily made in a casting.

MECHANICAL PROPERTIES:
Steel castings are ISOTROPIC - meaning “similar properties in all directions”. Steel forgings are ANISOTROPIC - meaning “similar properties in the direction of flow’’. Thus, in the direction of flow (material deformation), a steel forging’s strength is highest along its longitudinal axis, and decreases in the transverse direction. Whereas, in a steel casting, the properties are similar in all directions.

CORROSION RESISTANCE:
In certain stainless steels, castings tend to have better corrosion resistance than equivalent forgings this is due to controlled amounts of ferrite present in castings.

WEIGHT:
Steel castings are almost always lighter their forged counterparts “redesign from forgings to castings usually results in substantial savings in weight”. For example - a forged cannon muzzle brake weighed 600 lbs; this same part as a casting weighed 400 lbs. (and lasted over three times longer).
 
 
     Advantages of Castings  
 
STEEL CASTINGS WILL TEND TO HAVE THE ADVANTAGE OVER EQUIVALENT STEEL FORGINGS WHEN ANY OF THE FOLLOWING INSTANCES OCCUR:

     An unusual chemistry is required (i.e., a chemistry other than that which
          is the norm for steel mills)
     The part being considered is relatively large or has complex geometry.
     ► Stresses to be applied to the part are multi-axial.
     The material call-out is for a high manganese (approximately 13%),
          work-hardenable steel.
     ► Minimal set-up and tooling costs are a factor.
 
 
     Sources of Information  
 
CASTINGS vs FORGINGS - A REALISTIC EVALUATION”, Malcolm Blair, Raymond
   Monroe, SFSA
STEEL CASTINGS HANDBOOK”, 5th Edition, SFSA
FORGING HANDBOOK”, Forging Industry Association, ASM
WELDABILITY of CAST STEELS”, Literature Review, SFSA Special Report # 21
 
 
   
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