SA335/A335 Seamless Alloy Pipe
SA335/A335 P91 Seamless Alloy Pipe is mainly used for high temperature service. It’s equivalent to UNS K91560.
SA335/A335 P91 not only has high oxidation resistance and resistance to high temperature steam corrosion, but also has good impact
toughness, high and stable long-lasting plasticity and heat strength properties. In the use of temperature below 620 ℃, its use of stress
is higher than the austenitic stainless steel. Above 550℃, the recommended design stress is about 2 times of T91 and 2.25Cr-1Mo steel.
SA335/A335 P91 is an American standard chromium-molybdenum alloy steel, in the medium temperature (350-480 ℃) in the
hydrogen environment with the prevention of hydrogen embrittlement, hydrogen corrosion, hydrogen stripping, sulfide corrosion,
and at the same time has a good low tempering brittleness, is widely used in fertilisers, petrochemicals, and power plant equipment
manufacturing, such as ammonia reactors, coal gasification furnaces, converter furnaces, and hydrogenation reactors.
In addition, SA335/A335 P91 can be used as high-temperature superheater and reheater tubes for subcritical and supercritical boilers
with wall temperature ≤ 625℃, high-temperature header tanks and steam pipes with wall temperature ≤ 600℃, and also can be used
as heat exchangers for nuclear power and furnace tubes for cracking devices.
SA335/A335 P91(Type 1) Chemical Composition:
C: 0.08-0.12,Mn:0.3-0.6,P:0.02(Max),S:0.01(Max),Si:0.2-0.5,Cr:8-9.5,Mo:0.85-1.05, and others.
SA335/A335 P91(Type 1) Mechanical Property:
Tensile Strength: 585 Mpa(Min), Yield Strength: 415 Mpa(Min),Elongation: 20%(Min)
PS: SA335/A335 P91 also has Type 2, the mechanical property is same for Type 1 & Type 2, but the chemical composition is a little
different. And SA335/A335 P91 Type 2 is used less than Type 1. But both are available for us.
boiler pipe, alloy pipe
