Austenitic, duplex, and nickel alloy tubes for corrosive, sanitary, and high-purity applications.
Stainless steel tubes are tubular products manufactured from corrosion-resistant steel alloys containing a minimum of 10.5% chromium, which forms a passive protective oxide layer on the surface. This chromium-rich film provides exceptional resistance to corrosion, oxidation, and chemical attack, making stainless steel tubes indispensable in demanding industrial environments.
Stainless steel tubes are developed with a focus on "long, special, superior, high, precision, and cutting-edge" characteristics, covering ultra-long specifications, special steel grades, high-quality, high-end, precision, and advanced import-substitution products.
Produced through hot extrusion, piercing, cold rolling, cold drawing, and bending processes. Seamless tubes offer superior reliability under high pressure and extreme conditions.
Applications: High-pressure boilers, nuclear power plants, heat exchangers, precision instruments, oil and gas extraction.
Manufactured using advanced forming technologies including FFX, JCO, and ODF. Welded tubes provide cost-effective solutions for large-diameter applications.
Applications: Large-diameter fluid pipelines, structural applications, heat exchangers, condensers, chemical processing.
Bi-metallic tubes combining stainless steel or corrosion-resistant alloy layers with carbon steel backing, providing cost-effective corrosion protection for large-diameter applications.
| Application Category | Specific Product Types |
|---|---|
| Oil & Gas | CRA-OCTG (Corrosion-Resistant Alloy Oil Country Tubular Goods), SG-U tubes, HRB/MLP/WOL, nickel-based alloy OCTG |
| Power Generation | USC boiler tubes (ultra-supercritical), high/low pressure heater tubes (U-tubes), nuclear power tubes (Grade 1/2/3) |
| Food Processing | Food-grade sanitary tubes, dairy and beverage processing lines |
| Semiconductor | High-purity precision tubes with strict cleanliness requirements |
| Instrumentation | Precision instrument tubes, control and measurement system tubes |
| Kitchen & Bathroom | Mirror-finished and brushed decorative tubes for sanitary ware and fixtures |
| Heat Exchange | Heat exchanger tubes, condenser tubes, finned tubes, coiled tubes |
| Chemical & Petrochemical | Corrosion-resistant process piping, reactor tubes |
| Marine & Shipbuilding | Shipbuilding tubes, offshore platform tubes, submarine pipeline tubes |
| Grade | UNS | Characteristics | Applications |
|---|---|---|---|
| 304 / 304L / 304H | S30400 / S30403 / S30409 | General-purpose corrosion resistance; low carbon (L) for weldability; high carbon (H) for elevated temperature | Food processing, kitchen equipment, general industry |
| 316 / 316L | S31600 / S31603 | Molybdenum addition for enhanced pitting resistance; widely used in marine and sanitary applications | Food processing, marine, chemical, pharmaceutical, kitchen/bathroom |
| 321H | S32109 | Titanium stabilized for intergranular corrosion resistance | High-temperature service, thermal cycling |
| 347H | S34709 | Niobium stabilized for high-temperature strength | Superheaters, high-temperature boilers |
| 317L | S31703 | Higher molybdenum for severe corrosion resistance | Aggressive chemical environments |
| 310S | S31008 | High chromium and nickel for extreme oxidation resistance | Furnace tubes, high-temperature applications |
| Grade | UNS | Characteristics |
|---|---|---|
| S31803 | S31803 | Standard duplex; high strength and corrosion resistance |
| S32205 | S32205 | Enhanced chemistry over S31803; superior properties |
Nickel-based alloy tubes are essential for extreme service conditions including nuclear power steam generators, deep oil and gas wells, and severe corrosive environments.
| Alloy Series | Grade Examples | Characteristics | Applications |
|---|---|---|---|
| Inconel | Alloy 600, 625, 690, 718 | High nickel-chromium content; exceptional oxidation and corrosion resistance; 690 grade used in nuclear steam generators | Nuclear power, aerospace, chemical processing, high-temperature service |
| Incoloy | Alloy 800, 800H, 800HT, 825 | Iron-nickel-chromium alloy; good creep resistance; 825 offers excellent resistance to sulfuric and phosphoric acids | Heat exchangers, petrochemical, sour gas environments |
| Hastelloy | C-276, C-22, B-2, B-3 | Nickel-molybdenum-chromium alloys; outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in severe chemical environments | Chemical processing, flue gas desulfurization, pharmaceutical, semiconductor manufacturing |
| Product | Description |
|---|---|
| CRA-OCTG | Corrosion-resistant alloy OCTG for wells with high H₂S and CO₂ content; applicable for wells 4,000–6,500m depth |
| Nickel-Based Alloy OCTG | High-alloy materials for severe sour service environments |
Lightweight, highly corrosion-resistant; used in aerospace, chemical processing, and marine applications.
| Material | Characteristics |
|---|---|
| Superalloys / Specialty Alloys | For extreme environments including nuclear fusion and deep-sea exploration |
Advanced surface treatment technologies are employed to meet diverse application requirements, from food-grade hygiene to semiconductor purity and decorative aesthetics.
| Code | Description | Typical Applications |
|---|---|---|
| AP (Acid Pickling) | Acid pickling removes oxide scale and surface impurities; standard industrial finish | Chemical processing, general industrial applications |
| MP (Mechanical Polishing) | Polishing using abrasives to achieve smooth surface; eliminates surface imperfections | Food processing, pharmaceutical, architectural, kitchen/bathroom |
| BA (Bright Annealing) | Bright annealing in controlled atmosphere (hydrogen/nitrogen) produces a reflective, oxide-free surface; inherent to the heat treatment process | Semiconductor, precision instruments, high-purity applications |
| EP (Electropolishing) | Electrochemical polishing removes a microscopic surface layer; superior corrosion resistance and cleanliness; achieves mirror-like finish with exceptional smoothness | Semiconductor, pharmaceutical, food & beverage, ultra-high-purity systems |
Technical Note: Electropolished surfaces exhibit significantly higher critical pitting temperatures (CPT) compared to mechanically ground or acid-pickled surfaces, providing superior corrosion resistance in aggressive environments.
| Finish Type | Description | Applications |
|---|---|---|
| Mirror Finish | Highly reflective, polished surface; typical Ra ≤ 0.4 μm | Kitchen and bathroom fixtures, architectural trim, decorative applications |
| Brushed Finish | Directional satin finish achieved by abrasive brushing | Kitchen appliances, building products, decorative panels |
| Matte Finish | Non-reflective, uniform surface | Industrial and functional applications |
Coiled tubes are continuous-length tubes wound on spools or coils, enabling long, uninterrupted runs for applications requiring minimal joints.
| Attribute | Details |
|---|---|
| Product Types | Seamless and welded coiled tubes in stainless steel and nickel alloys |
| Applications | Heat exchangers (coil-type heaters, coolers, reactors), process instrumentation, subsea umbilicals, marine heating systems |
| Key Features | Continuous lengths reduce welding requirements; improved reliability in critical applications |
| Tube Type | OD Range (mm) | Wall Thickness Range (mm) |
|---|---|---|
| Seamless Tubes | 6 – 219 | 0.5 – 18 |
| Welded Tubes | 8 – 2540 | 0.5 – 30 |
Coiled Tubes: Available in various sizes with continuous lengths optimized for customer requirements.
| Length Type | Range |
|---|---|
| Fixed Length | 5.8 m, 6.0 m, 11.8 m, 12.0 m |
| Single Random Length (SRL) | 5.0 – 7.0 m |
| Double Random Length (DRL) | 10.0 – 14.0 m |
| Extended Lengths | Available on special order |
| Coiled / Continuous | Continuous lengths for coil-wound applications |
| Standard | Description |
|---|---|
| ASTM A213 / ASME SA213 | Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat exchanger tubes |
| ASTM A249 | Welded austenitic steel boiler, superheater, heat exchanger, and condenser tubes |
| ASTM A269 | Seamless and welded austenitic stainless steel tubing for general service |
| ASTM A312 | Seamless and welded austenitic stainless steel pipe |
| ASTM A511 | Seamless stainless steel mechanical tubing |
| ASTM A789 | Seamless and welded ferritic/austenitic stainless steel tubing for general service |
| ASME / ASTM Boiler Codes | For power generation and boiler applications |
| PED 97/23/EC | EU Pressure Equipment Directive |
| NACE MR0175 / ISO 15156 | Materials for H₂S-containing environments |
| Standard | Description |
|---|---|
| GB/T 14976 | Seamless stainless steel tubes for fluid transportation |
| GB/T 13296 | Seamless stainless steel tubes for boilers and heat exchangers |
| GB/T 21832 | Welded stainless steel tubes for fluid transportation |
| GB/T 24593 | Welded stainless steel tubes for boilers and heat exchangers |
