Take note.
ASTM A-516 Gr. 65 is a carbon steel plate used to manufacture pressure vessels that will work at moderate and lower temperatures. It is suitable when improved notch toughness (as measured by the impact, or Charpy, test) is required. Metallurgically, it's a fine grain, aluminum killed steel (and hence the suitability for lower temperatures and improved impact toughness).
Its chemical composition is the following:
Carbon: depends on the thickness. For thicknesses up to and including 1/2 inch: 0.24%. For thicknesses larger than 1/2 up to and including 2 inches: 0.26%.
Manganese: 0.85 to 1.20%
Silicon: 0.15 to 0.40%
Phosporus and sulphur: 0.035 maximum.
Mechanical properties are the following:
Yield strength: 35,000 psi minimum
Tensile strength: 65,000 - 85,000 psi (hence the identification as Gr 65).
After manufacturing, tensile test at the steel mill is mandatory. Other tests, as impact, may be carried out at the request of the purchaser.
The number 516 is just a sequential number. It means that the standard ASTM A-516 comes after the 515 and before the 517.
For welding A-516 steel, the material should be warm to the hand. Stress relief depends on the thickness. For pressure vessels (I don't know what's for pigs), it is to be carried out when the thickness exceeds 3/4 inch.
Giovanni S. Crisi
Sao Paulo - Brazil
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