ASTM A335 P91 Alloy Steel Seamless Pipes (NPS 2, 6, 10) for High-Temperature Power Plants
ASTM A335 P91 Alloy Steel Seamless Pipes (NPS 2, 6, 10) for High-Temperature Power Plants
YUHONG GROUP'S P91 and P92 steels are common grades that meet ASTM A335 or SA335 standards and are used for piping and power plant components because of their high strength at elevated temperatures.
Chemical composition comparison showed below:(%)
| Grade | C | Si max | Mn | P | S | Ni max | Cr | Mo | W |
| P91 | 0.08-0.12 | 0.50 | 0.30-0.60 | 0.02 | 0.01 | 0.4 | 8.0-9.5 | 0.85-1.05 | / |
Alloy Steel Pipe A 335/ ASME SA335 P91
Size : 1/2" TO 24 "IN OD & NB
Schedule: SCH20, SCH30, SCH40.
Type : Welded / Fabricated / Seamless
Length : Single Random, Double Random & Cut Length.
End : Plain End, Beveled End.
MATERIALS :
Alloy Steel Pipe A335 P91 – AS Pipe A335 P91
ASTM A335, Gr. P5, P9, P11, P12, P21, P22 & P91
Mechanical properties
| Grade | Tensile strength | Yield strength | Elongation |
| P11, P22, P5, P9 | ≥415 | ≥205 | ≥30/20 |
| P91 | ≥585 | ≥415 | ≥20 |
| P92 | ≥620 | ≥440 | ≥20 |
| Pipes Type | Seamless - Hot Rolled / Cold Drawn |
| Pipes Ends | Plain Ends / Beveled Ends / Coupling |
| Pipes Coating | Epoxy Coating / Colour Paint Coating / 3LPE Coating. |
| Other Testing | Tensile Test, Transverse Tension Tests, Flattening Test, Metal Structure and Etching Tests, Photomicrographs, Hardness Tests, etc. |
| Pipes Packaging | Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector |
| Pipes Shipment & Transportation | By Road - Truck / Train, By Sea - Break-bulk Conventional Vessel / FCL (Full Container Load) / LCL (Less Container Load) / 20 Feet Container / 40 Feet Container / 45 Feet Container / High Cube Container / Open Top Container, By Air - Freighter Civil Passenger and Cargo Planes |
ASTM A335 P91 Seamless Pipes heat treatment
| P5, P9, P11, and P22 | |||
| Grade | Heat Treatment Type | Normalizing Temperature Range F [C] | Subcritical Annealing or Tempering Temperature Range F [C] |
| P91 | Normalize and Temper | 1900-1975 [1040 – 1080] | 1350-1470 [730 – 800] |
| Quench and Temper | 1900-1975 [1040 – 1080] | 1350-1470 [730 – 800] |
ASTM A335 P91 Seamless Pipes Permissible Variation in Wall Thickness
| NPS [DN] Designator | Tolerance, % from Specified | |
| Over | Under | |
| 1/8 to 2 1/2 [6 to 65] incl., all t/D ratios | 20.0% | 12.5% |
| Above 2 1/2 [65], t/D < or = 5% | 22.5% | 12.5% |
| Above 2 1/2 [65], t/D > 5% | 15.0% | 12.5% |
| (t = Specified Wall Thickness; D = Specified Outside Diameter) | ||
Application for:
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Power generation
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Petrochemicals
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Gas processing
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Petrochemical Plants
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Heaters
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Oilfield services
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