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ASTM A335 / ASME SA335 P91 K90901 / 1.4903Alloy Steel Seamless Pipe

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ASTM A335 / ASME SA335 P91 K90901 / 1.4903Alloy Steel Seamless Pipe

Country/Region	china
City & Province	ningbo zhejiang
Categories	Metal Casting Machinery

Product Details

ASTM A335 / ASME SA335 P91 Alloy Steel Seamless Pipe for High-Temperature Service

ASTM A335/SA335 P91 is a ferritic alloy steel that has very high strength properties, which do not deteriorate with time, and are creep resistant. It is also called 9 Cr 1 Mo steel, or chrome moly pipe, based on its composition. Alloy P91 pipe is primarily composed of chromium (Cr), molybdenum (Mo), and vanadium (V) as key alloying elements. The specific composition of P91 typically includes around 9% chromium and 1% molybdenum, in addition to other elements like carbon, manganese, silicon, and nitrogen. Other alloy grades may have different compositions tailored for specific applications.

Main Materials

ASTM A335 (Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service)

ASTM A335 P1, P2, P5, P9, P12, P11, P22, P91

ASTM 213(Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes)
ASTM A213 T1, T2, T11, T5, T9, T22, T23, T91, T92

A335 Grade P91 Pipe Equivalent Material

ASTM	ASME	Equivalent material
A335 P 91	ASME SA 335 P91	1.4903, K90901, X10CrMoVNb9-1

A335 Grade P91 Pipe Equivalent Material Chemical Requirements

Element	Grade	P-5	P-9	P-11	P-22	P-91	P-91 shall also include the following:
Element	UNS Designation	K41545	S50400	K11597	K21590	K91560	P-91 shall also include the following:
Carbon		0.15 max	0.15 max	0.05 – 0.15	0.05 – 0.15	0.08 – 0.12	V at 0.18 – 0.25
Manganese		0.30 – 0.60	0.30 – 0.60	0.30 – 0.60	0.30 – 0.60	0.30 – 0.60	N at 0.030 – 0.070
Phosphorous, max		0.025	0.025	0.025	0.025	0.020	Ni at 0.40 max
Sulfur, max		0.025	0.025	0.025	0.025	0.010	Al at 0.02 max
Silicon		0.50 max	0.25 – 1.00	0.50 – 1.00	0.50 max	0.20 -0.50	Cb at 0.06 – 0.10
Chromium		4.00 – 6.00	8.00 – 10.00	1.00 – 1.50	1.90 – 2.60	8.00 – 9.50	Ti at 0.01 max
Molybdenum		0.45 -0.65	0.90 – 1.10	0.44 – 0.65	0.87 – 1.13	0.85 – 1.05	Zr at 0.01 max

Mechanical Properties
Grade	Tensile strength(MPa)	Yield strength(MPa)	Elongation(%)	Impact energy(J)	Hardness
P11	≥ 415	≥ 205	≥ 22	≥ 35	≤ 163HB
P12	≥ 415	≥ 220	≥ 22	≥ 35	≤ 163HB
P22	≥ 415	≥ 205	≥ 22	≥ 35	≤ 163HB
P5	≥ 415	≥ 205	≥ 22	≥ 35	≤ 187HB
P91	585~760	≥ 415	≥ 20	≥ 35	≤ 250HB
P92	≥ 620	≥ 440	≥ 20	≥ 35	250HB

The difference between alloy P91 pipe and other alloy grades commonly used in the industry:

Alloy Composition: Alloy P91 pipe is primarily composed of chromium (Cr), molybdenum (Mo), and vanadium (V) as key alloying elements. The specific composition of P91 typically includes around 9% chromium and 1% molybdenum, in addition to other elements like carbon, manganese, silicon, and nitrogen. Other alloy grades may have different compositions tailored for specific applications.
High-Temperature Strength: One of the main differentiating factors of P91 is its exceptional strength at elevated temperatures. It offers superior creep strength and resistance to thermal fatigue compared to many other alloy grades. This makes it suitable for high-temperature applications in power plants, boilers, and petrochemical industries.
Carbon Content: P91 has a higher carbon content compared to some other alloy grades, which contributes to its increased strength and hardness. However, this higher carbon content also leads to challenges during welding, requiring precise control of heat input and post-weld heat treatment.
Fabrication and Weldability: Alloy P91 has specific requirements when it comes to fabrication and welding. It necessitates precise preheating, interpass temperature control, and post-weld heat treatment to avoid detrimental effects on the material's microstructure and properties. Other alloy grades may have different welding procedures and considerations.

Application

A335/SA335 P91 is suitable for bending, flanging (vanstoning), and similar forming operations and for fusion welding. Its commonly used in below usages.