Yuhong Group Co.,Ltd
| Delivery Time | 7 DAYS |
| Standard | ASTM A335 / ASME SA335 |
| Length | Single Random, Double Random & Cut Length |
| End | Plain End, Beveled End |
| High Light | ASTM A335 P22 Alloy Steel Seamless Pipe, Cr-Mo Alloy Steel Pipe |
| Packaging Details | BUNDLE, PLYWOOD CASE |
| Product Name | Alloy Steel Seamless Pipe |
| Schedule | sch.10 to sch.XXS |
| Application | Power generation plants, Oil and gas industry,Chemical processing,etc. |
| Payment Terms | L/C,T/T |
| Type | Seamless |
| O.D. | 1/8" to 24" or custom |
| Material | P22 |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Model Number | ASTM A335 P22 Alloy Steel Seamless Pipe |
| Place of Origin | CHINA |
| Brand Name | YUHONG |
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Product Specification
| Delivery Time | 7 DAYS | Standard | ASTM A335 / ASME SA335 |
| Length | Single Random, Double Random & Cut Length | End | Plain End, Beveled End |
| High Light | ASTM A335 P22 Alloy Steel Seamless Pipe, Cr-Mo Alloy Steel Pipe | Packaging Details | BUNDLE, PLYWOOD CASE |
| Product Name | Alloy Steel Seamless Pipe | Schedule | sch.10 to sch.XXS |
| Application | Power generation plants, Oil and gas industry,Chemical processing,etc. | Payment Terms | L/C,T/T |
| Type | Seamless | O.D. | 1/8" to 24" or custom |
| Material | P22 | Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Model Number | ASTM A335 P22 Alloy Steel Seamless Pipe | Place of Origin | CHINA |
| Brand Name | YUHONG | ||
| High Light | 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.
PT TEST
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou... Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
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