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You are here : section steel--Katalor steel > News > 正文Why ASTM A355 P91 Steel Pipe is Different?

Why ASTM A355 P91 Steel Pipe is Different?

Grade 91 contains 9 % Chromium and 1 % Molybdenum compared to 2.5 % Chromium in the next best P22 grade. More important than the alloying elements is the formation of this alloy steel. The steel is formed by normalizing at 1050 °C, air cooling down to 200 °C.

Advantages of P91

Compared to its predecessor, the T22 or P22 grade, grade 91 exhibits high strength up to temperatures in the range of 600 °C. Also the oxidation temperature limits are higher.

ASTM A335 P91 Chemical Compositions (%)

Compositions	Data
UNS Designa-tion	K91560
Carbon (max.)	0.08-0.12
Manganese	0.30-0.60
Phosphorus (max.)	0.025
Silicon (max.)	0.50
Chromium	4.00-6.00
Molybdenum	0.45-0.65
Other Elements	…

Mechanical propertiesfor ASTM A335 P91

Properties		Data
Tensile strength, min, (MPa)		415 Mpa
Yield strength, min, (MPa)		205 Mpa
Elongation, min, (%), L/T		30/20

Inspection and Test of P91 Steel Pipe:

Chemical Composition Inspection, Mechanical Properties Test(Tensile Strength, Yield Strength, Elongation, Flaring, Flattening, Bending, Hardness, Impact Test), Surface and Dimension Test, No-destructive Test, Hydrostatic Test.

ASTM A355 P91 Specification：

1, Products: Alloy Pipe

2, standard: CB/T8162-2008, ASTM A335/A335M, ASTM A213/A213M,DIN17175-1979, JISG3467-1988

3, OD: 14-457mm Wall Thickness: 2-60mm

We can supply any size based on customer's requirements

Welcome new and old customers come to visit Katalor mill and company in china, we are professional ASTM A355 P91 Steel Pipe supplier and exporter for many years. If you cooperate with us, I assure you that we definitely won’t disappoint you.