We also offer higher yield variants of carbon steel flanges like F52, F60, F65, and F70 (all per A694).

These are heat treated carbon steel with a higher yield strength than common A105 flanges with a 35K yield strength minimum.

If your application calls for low temperature service, consider A350 LF2 carbon flanges (with Charpy V-Notch Impact Tests at -50°F) or the superior LF3 (CVNs at -150°F).


The yield strength is a characteristic of steel in which the material in question can withstand deformation. The point of stress in relation to said material in which plasticity deformation occurs is known as the yield point. This point is the maximum allowable load bearing occurrence upon which the steel material should be subjected. Yielding is a gradual failure measure which occurs over a period of time and in which case deformation is observable.

Forged Flange

A carbon steel heat treated variant with an increased yield strength (the point at which metal undergoes deformation) are most commonly used in applications of higher pressure and temperature, with flanges usually being class 600# and higher.

They are also less brittle compared to mild steel and have a slightly higher carbon content to make this possible. Their overall resistance to wear is their most important quality in applications which require a longer life service.

As mentioned previously, the specifications A694 and MSS-SP44 govern the details of this category of metals ranging from grades F42 to F70.

Our High Yield A694 flanges are often normalized to maintain a superior grain structure.

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