Name: ASTM A335 P22 Alloy Steel Seamless Pipe High-temperature Ferritic Alloy Steel Pipe Boiler
Brand: Yuhong Group Co.,Ltd
SKU: Tubo sin soldadura del acero de aleación de ASTM A335 P22
Price: 1000000 USD
Availability: InStock

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ASTM A335 P22 Alloy Steel Seamless Pipe High-temperature Ferritic Alloy Steel Pipe Boiler

Datos del producto:

Lugar de origen:	Porcelana
Nombre de la marca:	YUHONG
Certificación:	ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Número de modelo:	Tubo sin soldadura del acero de aleación de ASTM A335 P22

Pago y Envío Términos:

Cantidad de orden mínima:	500kg
Detalles de empaquetado:	PAQUETE, CAJA DE LA MADERA CONTRACHAPADA
Tiempo de entrega:	7 dias
Condiciones de pago:	LC, T/T

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Descripción detallada del producto

Nombre del producto:	Tubo sin soldadura del acero de aleación	Estándar:	Se aplicarán los siguientes requisitos:
Material:	P22	sobredosis:	1/8" A 24" o personalizado
Cronograma:	sch.10 a sch.XXS	Longitud:	Longitud de corte aleatoria simple, aleatoria doble
tipo:	Sin costura	Fin:	Extremo liso, extremo biselado
Solicitud:	Plantas de la producción de energía, industria del petróleo y gas, proceso químico, etc.
Resaltar:	ASTM A335 P22 alloy steel pipe , high-temperature ferritic alloy pipe , seamless boiler steel tube

ASTM A335 P22 / UNS K21590 Alloy Steel Seamless Pipe 2.25Cr-1Mo Steel Pipe for High-temperature Service

YUHONG Group supplies ASTM A335 / ASME SA335 alloy steel pipes worldwide, with our product portfolio covering the most popular ASTM A335 materials, including P5, P9, P11, P22, P91, and P92 ... ASTM A335 P22 is a life-limited consumable item. It is a seamless ferritic pipe, heat-treated (Normalized + Tempered), engineered to deliver reliable creep-rupture strength up to 550°C, specifically for superheaters, reheaters, and high-pressure steam headers. It is a pipe that must be ordered with hardness limits, grain-size requirements, and impact-testing added to the PO. If you buy it without these 'Supplementary Requirements,' the official ASTM definition gives the mill permission to ship you a pipe that technically passes chemistry but may fail in 5 years instead of 20.

ASTM A335 P22 Pipe Specification

Standard	ASTM A335 P22, SA335 P22
Size	1/8"- 24" or custom
Schedules	sch.10 to sch.XXS
Type	Seamless
Length	Single Random, Double Random & Cut Length
A335 P22 Pipe End	Plain End, Beveled End, Treaded
Usage	Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service

Chemical composition % of ASTM A335 P22 Alloy Steel Seamless Pipe High-temperature Ferritic Alloy Steel 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 ASTM A335 P22 Alloy Steel Seamless Pipe High-temperature Ferritic Alloy Steel Pipe

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

Hydrogen Service Limits (The Nelson Curve Nuance)

P22 is widely used in hydrogen reformer boilers. Websites mention "resistant to hydrogen attack," but they rarely spell out the Nelson Curve partial pressure limit.
The hidden fact: For P22, the safe operating limit is roughly 3.0 MPa (435 psi) hydrogen partial pressure at 540°C. However, if your feedwater carries chlorides that hydrolyze to HCl, the hydrogen permeation rate doubles. Even more obscure: The mill's deoxidation practice (Silicon vs. Aluminum killed) drastically affects this. Aluminum-killed P22 has finer, more stable AlN precipitates that pin grain boundaries, significantly improving the Nelson Curve threshold—yet standard P22 orders do not specify Al content unless you add a supplementary requirement (S2/S3) to the purchase order.

Applications

This grade is the workhorse of conventional thermal power plants and industrial boilers. Specific uses include:

Superheaters & Reheaters: Pipes carrying superheated steam from the boiler drum to the turbine.
Water Wall Tubes: Furnace walls where radiant heat is absorbed.
Header Pipes: Main steam headers and feedwater headers operating in the creep range.
Heat Exchangers: In petrochemical plants handling high-pressure, high-temperature hydrocarbons.
Fossil Fuel Power Plants: Sub-critical and super-critical boiler piping systems.