Categories | Petrochemical Pipe |
---|---|
Brand Name: | NEW FORCE |
Model Number: | P91 |
Certification: | MTC |
Place of Origin: | China |
MOQ: | 10 tons or negotiable |
Payment Terms: | L/C, T/T |
Supply Ability: | 200000 tons |
Delivery Time: | 4~15 weeks |
Packaging Details: | bare and loose |
Material: | Alloy Steel |
Standard: | ASTM A335 |
Manufacture: | Hot Rolled |
Application: | Petrochemical & Refinery |
Max. Size: | 48'' |
Form: | Seamless |
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
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 | |||||||||
Grade | UNS Designation | Composition, % | |||||||
C | Mn | P max | S max | 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
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
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.
Friendly Links: www.everychina.com
Home| Products| Suppliers| Quality Suppliers| Site Map |About Us |Help