Heat Treatment

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Except for flanges of A105 materials in Classes 150 and 300, which are normally sold in the "as forged" condition, all flanges 400 PSI and heavier are required to be heat treated. When required by the purchase order, A105 Class 150 and 300 must also be heat treated. Standard heat treatments used on flange forgings are:

A. Normalize — Heat the forging to a temperature in the austenitic range and hold for a sufficient time to allow uniform heating of the piece. Then cool in still air.	C. Quench and Temper — Heat the forging to a temperature in the austenitic range and hold for sufficient time to permit uniform heating of the piece. Remove from the furnace and immerse in an agitated tank of a suitable medium. Quenchant temperature must be controlled to provide a suitable rapid cooling rate. The piece must then be tempered as described below.
B. Anneal — Heat the forging to a temperature in the austenitic range and hold for a sufficient time to allow uniform heating of the piece. Furnace cool to 800°F and remove from furnace.	D. Temper — Heat the forging to a temperature below the lower critical temperature (usually between 1100°F and 1250°F for carbon steels), hold for a sufficient time to ensure uniform heating of the piece and then cool in still air.

The heat treatments listed below may also be combined to include Normalize and Temper, Double Normalize, or Double Normalize and Temper. Customer requirements for special heat treatment of forgings will add to lead time and cost.

Table 2:

HEAT TREATMENT
	_{_{_A105}}	_{_{_A350-LF2}}	_{_{_{A350 LF6,C1}}}	_{_{_A350-LF9}}	_{_{_A694}}	_{_{_{A707 L1,C2}}}	_{_{_{A707 L3,C3}}}	_{_{_{A707 L5,C4}}}
As Forged	X*	-	-	-	-	-	-	-
Normalize	X	X	X	X	X	X	X	X
Anneal	X	-	-	-	-	X	X	X
Quench & Temper	X	X	X	X	X	X	X	X
Quench & Precip. Heat Treat	-	-	-	-	X	X	X	X
Normalize & Temper	-	X	X	X	X	X	X	X
Norm. & Precip. Heat Treat	-	-	-	-	X	X	X	X

* Applies to Class 150 and Class 300 Only.