Name: ASTM A335 / ASME SA335 Grade P11 Alloy Steel Seamless Pipe for Power Plant
Brand: Yuhong Group Co.,Ltd
SKU: ASTM A335 P11 Alloy Steel Seamless Pipe
Price: 100000 USD
Availability: InStock

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ASTM A335 / ASME SA335 Grade P11 Alloy Steel Seamless Pipe for Power Plant

Product Details:

Place of Origin:	CHINA
Brand Name:	YUHONG
Certification:	ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Model Number:	ASTM A335 P11 Alloy Steel Seamless Pipe

Payment & Shipping Terms:

Minimum Order Quantity:	500KGS
Packaging Details:	plywood case, bundle with plastic cap
Delivery Time:	7 DAYS
Payment Terms:	L/C,T/T

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Detailed Product Description

Product Name:	Alloy Steel Seamless Pipe	Standard:	ASTM A335 / ASME SA335
Material:	Grade P11	O.D.:	1/2" TO 24 " Or Large
W.T.:	SCH 5 TO SCH XXS	Length:	Single Random, Double Random & Cut Length
End:	Plain End, Beveled End
Highlight:	ASTM A335 P11 alloy steel pipe , ASME SA335 seamless boiler tube , power plant alloy steel piping

ASTM A335 / ASME SA335 P11 Alloy Steel Seamless Pipe for High‑temperature Service

ASTM A335 / ASME SA335 Grade P11 is a seamless, chromium‑molybdenum alloy steel pipe designed for high‑temperature service in power plants and petrochemical plants. Its nominal composition of 1.25% Cr – 0.5% Mo provides enhanced creep strength and oxidation resistance up to ~570°C, making it suitable for superheater tubes, main steam lines, and headers in subcritical boilers and HRSGs.

In power plants, P11 pipes are used in boilers, superheaters, heat exchangers, and high-pressure steam lines where materials must resist creep, oxidation, and thermal fatigue at elevated temperatures (typically up to ~570–600°C / 1050–1110°F).

Key Properties for Power Plant Use

Property	Benefit
High-temperature creep resistance	Withstands long-term stress at up to ~570°C without excessive deformation.
Oxidation resistance	Chromium forms a protective oxide layer in steam/combustion gases.
Good thermal fatigue resistance	Handles cyclic heating/cooling in boilers.
Weldability	Acceptable with preheat (150–200°C) and post-weld heat treatment (PWHT).
Resistance to hydrogen attack	Suitable for high-pressure hydrogen service (e.g., refinery/power applications).

Specifications of Alloy Steel Seamless Pipe

Standard	ASTM A335, ASME SA335
Grade	Gr. P5, P9, P11, P12, P21, P22 , P91, P92
Size	1/2" TO 24 "IN OD & NB or custom
Schedule	SCH 5- SCH XXS, or custom
Type	Seamless
Length	Single Random, Double Random & Cut Length
End	Plain End, Beveled End

Chemical composition(%) of ASTM A335 P-series Alloy Steel Seamless Pipe

Grade	C	Mn	P≤	S≤	Si	Cr	Mo
P11	0.05-0.15	0.30-0.60	0.025	0.025	0.50-1.00	1.00-1.50	0.44-0.65
P22	0.05-0.16	0.30-0.60	0.025	0.025	≤0.50	1.90-2.60	0.87-1.13
P5	≤0.15	0.30-0.60	0.025	0.025	≤0.50	4.00-6.00	0.45-0.65
P9	≤0.15	0.30-0.60	0.025	0.025	0.25-1.00	8.00-10.00	0.90-1.10
P91	0.08-0.12	0.30-0.60	0.020/0.010	0.020/0.010	0.02-0.50	8.00-9.50	0.85-1.05
P92	0.07-0.13	0.30-0.60	0.020/0.010	0.020/0.010	≤0.50	8.50-9.50	0.30-0.60

Mechanical properties of of ASTM A335 P-series Alloy Steel Seamless Pipe

Grade	Tensile strength	Yield strength	Elongation
P11, P22, P5, P9	≥415	≥205	≥30/20
P91	≥585	≥415	≥20
P92	≥620	≥440	≥20

Fabrication and Welding Requirements (for power plant)

Preheating Required: 150–200°C (300–400°F) before welding.
Post‑Weld Heat Treatment (PWHT) Mandatory: 700–760°C (1290–1400°F), hold 1 hour per 25 mm thickness.
Filler metals – Use matching composition: AWS A5.5 E8018-B2 (electrode) or ER80S-B2 (wire).
Nondestructive Examination (NDE) – Usually 100% radiography (RT) or ultrasonic (UT) for power plant high‑energy piping.

Applications

1. Superheater and Reheater Tubing

2. Main Steam Piping

3. Hot Reheat Piping
4. Boiler Headers and Manifolds
5. Heat Exchanger Tubing (Feedwater Heaters & Economizers)
6. High‑Pressure Steam Lines in Combined Cycle HRSGs
7. Chemical Injection / Sampling Lines

8. Power Plant

ASTM A335 / ASME SA335 Grade P11 Alloy Steel Seamless Pipe for Power Plant 0