1. Produced in strict accordance with ASME SA-335 / SA-335M core standard, also compliant with ASTM, GB, DIN, EN and JIS international standards, covering seamless, ERW and SAW alloy steel pipe types
2. Comprehensive size range: Outer diameter 6mm–1080mm (1/8''~26''), wall thickness SCH STD / 30 / 40 / 60 / 80 / 120 / 140 / 160 / XS / XXS, wall thickness 1mm–135mm
3. Flexible length customization: Single random length, double random length, fixed cut length up to maximum 23m, customized length per client demand
4. Multiple pipe end forms: Plain end, beveled end, threaded end with protective plastic caps to avoid transportation damage
5. Diversified surface anti-corrosion treatment options: Black paint, varnish, 3PE coating, hot galvanizing (10~50 g/m² zinc layer), bare tube or custom coating
6. Complete non-destructive testing before delivery: Ultrasonic examination, eddy current inspection, hydrostatic pressure test to eliminate internal defects
7. Full series standard grades available: P11, P12, P22, P5, P9, P91, T5, T11, T22, 12CrMo, 15CrMo, 4140 and other boiler heat-resistant alloy steel grades
8. Complete certification system: API 5L/5CT, ISO, PED certificates; flexible trade terms (FOB/CIF/CFR) and payment modes (T/T, L/C) to support global project cooperation

This ASME SA-335 / SA-335M alloy steel seamless pipe is a high-performance heat-resistant alloy tubular product specially developed for high-temperature, high-pressure industrial working conditions. It adopts hot rolling and cold drawing forming processes, with uniform internal metallographic structure and stable high-temperature mechanical properties, widely recognized in energy and chemical heavy industries.

We supply three production processes: seamless pipe, electric resistance welded (ERW) pipe and submerged arc welded (SAW) pipe. All OD, wall thickness and length tolerances strictly implement ASTM A450, A530 and ASME SA-335 tolerance standards to meet precise assembly requirements of boilers, power plants and petrochemical pipelines.

Optional multi-layer anti-corrosion surface coatings effectively resist oxidation and medium erosion. Standardized bundled packaging design prevents rust and collision damage during long-distance sea transportation. Each batch of pipes undergoes full physical and chemical inspection to guarantee long-term safe operation under high temperature and pressure.

• Chromium-molybdenum alloy structural steel with excellent high-temperature creep resistance and oxidation resistance
• Stable mechanical performance under continuous high-temperature service; minimum tensile strength 415MPa, minimum yield strength 205MPa, elongation ≥30%
• Good ductility, supporting cutting, bending, welding and secondary CNC machining for complex pipeline layout
• Balanced chromium & molybdenum composition resists high-temperature oxidation and medium corrosion in boiler, furnace and petrochemical systems
• Compatible with various anti-corrosion coating processes without peeling or failure of protective layer
• Preferred material for high-pressure boiler tubes, superheater tubes, heat exchange tubes and high-temperature fluid transmission pipelines

We provide matched seamless pipes, welded pipes, flanges and machined fittings covering heat-resistant alloy steel, carbon steel, stainless steel and nickel-based alloys for diversified industrial working conditions:

1. ASME SA-335 / SA-213 Heat Resistant Alloy Steel: P11, P12, P22, P5, P9, P91, T5, T11, T12, T22, 12CrMo, 15CrMo, 1Cr9Mo, 4140
2. Carbon Steel Pipe Grades: A106 Gr.A/B/C, ASTM A53, 10#, 20#, 45#, S235JR, Q195/Q235/Q345
3. Austenitic & Duplex Stainless Steel: 304, 316L, 310S, 904L, 2205, 2507
4. Nickel-Based Corrosion Resistant Alloys: Nickel 200/201, Monel 400, Inconel 625, Hastelloy C276 (ASTM B167 Tube, ASTM B564 Flange)
5. Matching Auxiliary Products: Welded alloy steel pipe, heavy-wall forged hollow bar, alloy steel blind/weld neck flanges

Chromium-molybdenum alloy formula maintains stable tensile and yield strength under long-term high temperature and high pressure, ideal for boiler, power station and thermal furnace pipeline systems.

Cr-Mo elements inhibit high-temperature oxidation; optional 3PE, hot galvanized coatings further extend service life in petrochemical acidic & alkaline fluid environments.

Full coverage of outer diameter, wall thickness, length, pipe end shape and surface coating; strict hot-rolled/cold-drawn dimensional tolerances meet precision engineering assembly standards.

Each pipe passes ultrasonic, eddy current and hydrostatic testing to eliminate internal cracks, pores and leakage risks for critical high-pressure process pipelines.

Uniform steel strip bundling, end plastic caps, unified batch marking; same furnace number, grade and specification bundled together to avoid confusion and rust during long-distance transportation.

Minimum elongation of 30% allows bending, cutting and complex forming; compatible with mainstream welding processes for on-site pipeline splicing and installation.

• Power plant & boiler industry: High-temperature superheater tubes, reheater tubes, waste heat recovery pressure pipelines
• Petrochemical & chemical industry: High-temperature oil/gas transmission pipes, acid medium reactor heat exchange tubes
• Energy & thermal engineering: Furnace flue pipelines, high-pressure fluid conveying system pipes
• Aerospace & military industry: High-temperature pressure-resistant fluid tubular components
• Metallurgy & thermal processing: High-temperature oxidation resistant furnace pipeline systems
• General industrial high-pressure vessel supporting piping

We provide integrated forging and precision machining services, and can produce finished components strictly according to customer drawings:

Turning, milling, planing, drilling, boring, grinding

Gear cutting, CNC precision machining

Sizing cutting, surface treatment and finishing

We have supplied a wide range of forged and machined parts including shafts, cylinders, hollow bars, pistons, tube sheets, rings and disc bearings to customers worldwide.

We have a professional QC inspection team and complete testing equipment to ensure stable and reliable product quality:

Ultrasonic testing (UT) for internal defects

Tensile and hardness testing for mechanical properties

High-precision dimensional measurement

Spectrometer for chemical composition verification

Metallographic microstructure inspection

Every batch of products undergoes strict inspection before delivery to meet the quality requirements of various engineering projects.

Inner packaging: waterproof polybag for moisture and dust protection

Outer packaging: reinforced wooden case / wooden pallet, suitable for long-distance international transportation

Custom packaging solutions available upon request

Normally 10 – 45 days after receipt of advance payment

Exact delivery time depends on order quantity, specification complexity and machining requirements