ASTM A335 Alloy Steel Pipe | High-Temperature Seamless Pipe Manufacturer – Huaga
Huagang Industrial supplies ASTM A335 seamless alloy steel pipes engineered for high-temperature and high-pressure service. Manufactured with precision cold-drawn technology, our A335 pipes deliver superior mechanical strength, consistent wall thickness, and reliable performance for boilers, power plants, petrochemical systems, and automotive applications. Get technical data, sizes, grades, and custom solutions.
Product Info
ASTM A335 Alloy Steel Pipe | High-Temperature Seamless Pipe Manufacturer – Huagang Industrial
ASTM A335 alloy steel pipe is specifically designed for high-temperature and high-pressure service in power plants, petrochemical facilities, and refinery units. As a dedicated manufacturer of cold-drawn precision seamless steel tubes, Zhangjiagang Huagang Industrial Co., Ltd. provides A335 pipes that deliver superior strength, stable performance, and excellent long-term reliability under harsh operating conditions. With nearly 20 years of manufacturing expertise, advanced production equipment, and strict quality control systems aligned with ISO/TS 16949 and national pressure pipeline certifications, Huagang ensures consistent quality for every A335 grade we supply.
What is ASTM A335 Alloy Steel Pipe?
ASTM A335 is a specification covering seamless ferritic alloy steel pipes intended for high-temperature service. The alloying elements-primarily chromium and molybdenum-enhance the material's creep strength, oxidation resistance, and thermal stability. This makes A335 pipes essential components in boiler systems, superheaters, reheaters, steam lines, and high-pressure pipelines where long-term durability is critical.
Huagang's production is fully based on cold-drawn manufacturing, enabling tighter dimensional tolerances and improved mechanical properties compared with hot-rolled alternatives. This process ensures that A335 pipes maintain excellent structural integrity even under continuous thermal cycling.
Available Sizes
Item | Specification |
Outer Diameter (OD) | 10.3 mm – 1219 mm (1/2" – 48") |
Wall Thickness (WT) | 1.5 mm – 200 mm |
Pipe Length | 5.8m, 6m, 11.8m, 12m, or random length / fixed length |
Manufacturing Process | Hot Rolled / Hot Expanded / Cold Drawn |
Wall thickness: 1.5mm-200mm | Outer diameter: 10.3mm-1219mm |
Key Features and Performance Advantages
Huagang's ASTM A335 alloy steel pipes offer:
Strong high-temperature resistance enabling continuous operation under elevated pressures and temperatures.
Enhanced oxidation and corrosion resistance provided by chromium-molybdenum alloying.
Superior wall thickness consistency and dimensional accuracy thanks to cold drawn manufacturing.
Smooth internal and external surfaces improving flow efficiency and weld integrity.
Strong mechanical performance including tensile strength, yield strength, and impact toughness.
These advantages position our A335 pipes as a reliable long-term solution for energy and industrial systems requiring high thermal stability.
Applications of ASTM A335 Alloy Steel Pipe
A335 pipes are widely used across high-temperature and high-pressure systems, including:
Power plant boilers, superheaters, reheaters
Steam pipelines and high-pressure headers
Petrochemical heater tubes
Refinery reformer tubes
High-temperature structural and pressure-bearing systems
Heat-exchanger tubes requiring elevated-temperature strength
The A335 series comprises multiple grades designed for various temperature ranges and stress conditions. A335 P11 is widely used in medium-temperature boiler tubes and heater coils, while A335 P22 provides enhanced strength for steam lines and high-pressure headers. For critical high-temperature service, A335 P91 offers exceptional creep resistance and is the preferred material in modern power plants and superheater assemblies. Huagang's cold-drawn manufacturing route ensures uniform wall thickness, improved surface finish, and superior metallurgical stability across all supplied grades.
Product Properties
Chemical Composition (ASTM A335 Requirements)
Element | P1 (%) | P2 (%) |
Carbon (C) | 0.10–0.20 | 0.10–0.20 |
Manganese (Mn) | 0.30–0.60 | 0.30–0.60 |
Chromium (Cr) | 0.44–0.65 | 0.44–0.65 |
Molybdenum (Mo) | 0.44–0.65 | 0.44–0.65 |
Element | P11 (%) | P22 (%) | P91 (%) |
Carbon (C) | 0.05–0.15 | 0.05–0.15 | 0.08–0.12 |
Chromium (Cr) | 1.00–1.50 | 1.90–2.60 | 8.00–9.50 |
Molybdenum (Mo) | 0.44–0.65 | 0.87–1.13 | 0.85–1.05 |
Nickel (Ni) | ≤ 0.40 | ≤ 0.40 | ≤ 0.40 |
Vanadium (V) | - | - | 0.18–0.25 |
Nitrogen (N) | - | - | 0.03–0.07 |
Mechanical Properties (Minimum Requirements)
Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
P1 | 380 | 205 | 30 |
P2 | 415 | 205 | 30 |
P5 | 415 | 205 | 30 |
P9 | 415 | 205 | 30 |
P11 | 415 | 205 | 20 |
P22 | 415 | 205 | 20 |
P91 | 585 | 415 | 20 |
Technological Advantages & Quality Control
Technological Advantages
With nearly two decades of expertise, Huagang is recognised as a top precision seamless steel tube manufacturer. We integrate R&D, production, quality management, logistics, and global customer service, enabling customers to secure stable supply and consistent product performance.
Our long-term partnerships with global brands demonstrate our capability to meet rigorous quality expectations.
Adopting cold drawn precision seamless technology to ensure high dimensional accuracy, smooth surface, and uniform wall thickness of steel tubes.
After heat treatment and surface treatment, the mechanical properties and corrosion resistance of the steel tube are further improved.
Adopting cold drawn precision seamless technology to ensure high dimensional accuracy, smooth surface, and uniform wall thickness of steel tubes. | After heat treatment and surface treatment, the mechanical properties and corrosion resistance of the steel tube are further improved. |
Delivery Status:
Designation | Symbol | Description |
Cold drawn / hard | +C (BK) | After the last cold forming no heat treatment. |
Cold drawn / soft | +LC (BKW) | After the last heat treatment, follows the cold drawing there is a light finishing pass. |
Cold drawn and stress relieved annealed | +SR (BKS) | After the final cold drawing process, the tubes are stress-relieved and annealed in a controlled atmosphere. |
Annealed | +A (GBK) | After the last cold drawing process, the tubes are annealed in a controlled atmosphere. |
Normalized | +N (NBK) | After the last cold drawing process, the tubes are normalized in a controlled atmosphere. |
Quality Control
Strict Testing Chemical composition analysis: Ensure that the material composition meets the standard requirements. Mechanical performance testing: Including tensile testing, impact testing, etc., to ensure that the steel tube has sufficient strength and toughness. Non destructive testing: Using ultrasonic, eddy current, or radiographic testing techniques to detect internal defects in steel tubes. Hydraulic test: Each steel tube undergoes a hydraulic test to ensure good sealing and pressure bearing capacity in high-pressure environments. | Testing Standards Compliant with international standards such as GB3087, DIN17175, ASTM A53, ASTM A519, ASTM A106, ASTM A179, ASTM A192, etc. Each batch of products comes with detailed quality inspection reports and certificates of conformity. | Certification Guarantee Obtained ISO/TS16949:2009 quality system certification and obtained the national special equipment pressure pipeline component manufacturing license. |
