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ASTM / ASME 335 Standard P91

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ASTM / ASME 335 Standard P91

ASTM / ASME 335 Standard P91
ASTM / ASME 335 Standard P91 ASTM / ASME 335 Standard P91

Large Image :  ASTM / ASME 335 Standard P91

Product Details:

Place of Origin: China
Brand Name: NEW FORCE
Certification: MTC
Model Number: P91

Payment & Shipping Terms:

Minimum Order Quantity: 10 tons or negotiable
Packaging Details: bare and loose
Delivery Time: 4~15 weeks
Payment Terms: L/C, T/T
Supply Ability: 200000 tons
Detailed Product Description
Material: Alloy Steel Standard: ASTM A335
Manufacture: Hot Rolled Application: Petrochemical & Refinery
Max. Size: 48'' Form: Seamless
High Light:

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Petrochemical & Refinery Seamless Steel Pipe ASTM / ASME 335 Standard P91
The pipe of P91 is mainly used in petrochemical & refinery field. Mechanical properties and dimensions are uniform in longitudinal & transversal directions. Pipe has better surface and without any defects.
1. Reference Documents

  • ASTM A999/A 999M Specification for General requirements for Alloy and Stainless Steel Pipe.
  • ASTM E 213 Practice for Ultrasonic Examination of metal Pipe and Tubing
  • ASTM E 309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
  • ASTM E 381 Method of Macroetch testing Steel Bars, Billets, Blooms, and Forgings
  • ASTM E 570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
  • ASME B26.10M Welded and Seamless Wrought Steel Pipe

2. Standards:
ASTM A335 Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
3. Application:
For high pressure boiler and steam header pipes; petrochemical industry pipes; thermal power plant; nuclear power plant; USC boiler.
4. Ordering Information
Quantity (feet, meters, or number of lengths),
Name of material (seamless alloy steel pipe),
Grade (P91),
Manufacture (hot-finished or cold-drawn),
Size using one of the following:
NPS and schedule number;
Outside diameter and nominal wall thickness;
Outsider diameter and minimum wall thickness;
Inside diameter and nominal wall thickness;
Inside Diameter and minimum wall thickness.
Length (specific or random)
End finish (plain end or bevel end)
5. Chemical Requirements

Chemical Requirements



Composition, %
C Mn P
Si Cr Mo Others
P91 K91560 0.08-0.12 0.30-0.60 0.020 0.010 0.20-0.50 8.00-9.50 0.85-1.05 V 0.18-0.25
N 0.030-0.070
Ni 0.40max
Al 0.02max
Cb 0.06-0.10
Ti 0.01 max
Zr 0.01max

6. Available Size Range

OD Thickness
mm inch mm SCH
88.9~1422 3''~ 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.

7. Tensile Requirements
Tensile Strength min.: 85ksi / 585MPa
Yield Strength min.: 64ks / 415MPa
8. Inspection & Test
Chemical composition, mechanical properties ( tensile strength, yield strength, elongation, flaring, flattening, bending, hardness, impact test), surface and dimension, NDE, hydrostatic test.
9. Manufacture
Hot Rolled for 8'' and above or Cold Drawn for 6'' and below
10. Manufacturing Process
Raw Material Inspection → Cold Centering → Heating → Piercing & Rolling → SIzing → Heat Treatment → Testing → Finishing → NDE → Visual & Dimension Inspection → Marking → Storing & Shipping
11. Heat Treatment
Normalizing for all product forms shall be performed within the temperature range of 1040-1080°C. Once the surface temperature of the component has exceeded 1040°C, the minimum time at temperature shall be specified in the table below.
The product shall be air cooled outside of the furnace and away from any source of heat or other conditions that would retard the rate of cooling or cause non-uniform cooling. Cooling shall be continuous down to at least 95°C at the metal surface before tempering.
The rate of cooling shall be at least 5°C/min from the normalization temperature to 600°C. Note that for components greater in wall thickness than 75mm, forced air-cooling or oil quenching or the equivalent from the normalizing temperature to a surface metal temperature below 600°C may be necessary to achieve the required mechanical properties.

Section or Wall Thickness Minimum Hold Period After Metal Surface Temperature has Exceeded 1040°C
≤50mm (2 inch) 10 minutes
>50mm (2 inch), ≤75mm (3 inch) 30 minutes
>75mm (3 inch), ≤100mm (4 inch) 45 minutes
>100mm (4 inch), ≤125mm (5 inch) 75 minutes
>125mm (5 inch), ≤150mm (6 inch) 90 minutes

Tempering for all product forms is to be performed within the temperature range of 770-790°C. Time at the tempering temperature shall be at least one hour per 25mm of thickness, with a minimum tempering time of 10 minutes. The product may be furnace cooled or cooled in still air from the tempering temperature, so long as excessive distortion, excessive thermal stresses, and over-tempering are avoided.
ASTM / ASME 335 Standard P91 0

Contact Details
Xi'an New Force Energy Engineering Co.,Ltd

Contact Person: zaya_z

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