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P91 Material High Pressure Boiler Tube , Alloy Steel Pipe ASTM A335 Standard

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P91 Material High Pressure Boiler Tube , Alloy Steel Pipe ASTM A335 Standard

Brand Name : XOOS
Model Number : 48''
Certification : MTC
Place of Origin : China
MOQ : 10 tons or negotiable
Payment Terms : L/C, T/T
Supply Ability : 200000 tons per month
Delivery Time : 5~10 weeks
Packaging Details : bare and loose
Steel : Alloy Steel
Application : High Pressure Boiler
Material : P91
Standard : ASTM A335
Size : 1219mm x 140mm
OD : 48''
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P91 Material High Pressure Boiler Tube , Alloy Steel Pipe ASTM A335 Standard

Grade 91 contains 9 % Chromium and 1 % Molybdenum compared to 2.5 % Chromium in the next best P22 grade. Chromium improves high temperature strength and increases oxidation resistance. Molybdenum increases the creep resistance. Also present are smaller quantities of Nickel and Manganese which increase the hardenability of the steel.

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. It is then tempered by heating to 760 °C. The temperatures and the cooling rates are very important. This produces the microstructure that results in the high creep strength properties.

1. Standards

ASTM A335 ——Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service

2. Application

For the high-pressure boiler and steam pipes, and the petrochemical industry pipes;
Power plant; Chemical Fertilizer; Petrochemicals; Offshore Oils; Gas Productions; Refineries and etc.

3. Dimensional Tolerance

Pipe typesOD (mm)ToleranceWT (mm)Tolerance
High Pressure Boiler Tube219~457±1.0%≤20-10% ~ +12.5%
20~40-10% +10%
457~1422±0.9%>40~70-7%, +9%
>70~20-6%, +8%

4. Chemical Composition:

GradeUNS DesignationComposition, %
P91K915600.08-0.120.30-0.600.020.010.20-0.508.00-9.500.85- 0.030-0.070
Al 0.02max
Cb 0.06-0.10
Ti 0.01 max
Zr 0.01max

6. Mechanical Properties

Steel pipes No.Tensile strengthYield strengthElongationImpact energyHardness

7. Available Size Range:

88.9~14223''~ 56''2.11~140≥SCH10
*If the steel grades and size you are looking for are not listed above, please contact us for further information.

MTC sample could be provided upon request.

For additional requirements on chemical composition, mechanical properties, and supplementary requirements, please contact us for customization!

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seamless steel tube


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