Austenitic stainless steels are the most widely used category of stainless steel, renowned for their excellent corrosion resistance, high ductility, and good mechanical properties across a wide temperature range. BENKOO METAL's seamless pipes are manufactured using state-of-the-art processes to ensure superior metallurgical structure, dimensional accuracy, and performance consistency.
Key Characteristics:
Non-Magnetic: Typically non-magnetic in the annealed condition.
Excellent Corrosion Resistance: Superior resistance to a wide range of atmospheric, chemical, and organic corrodents.
High Ductility & Toughness: Excellent formability and impact resistance, even at cryogenic temperatures.
Good Weldability: Can be welded by all standard fusion and resistance methods.
Hygienic Surface: Smooth, non-porous surface ideal for sanitary applications.
Material Specifications & Grades
BENKOO METAL offers an extensive portfolio of austenitic stainless steel grades to suit various corrosive environments and service conditions.
American Standard (ASTM/UNS) Grades
Grade (Common Name) | UNS Number | Key Characteristics & Typical Composition | Primary Applications |
304 / 304L | S30400 / S30403 | 18% Cr, 8% Ni, low carbon (L). Excellent general-purpose corrosion resistance, formability, and weldability. | Food processing equipment, chemical containers, architectural trim, household appliances. |
304H | S30409 | Higher carbon version of 304 for improved high-temperature strength. | High-temperature applications like heat exchangers, boiler tubes, superheaters. |
316 / 316L | S31600 / S31603 | 16-18% Cr, 10-14% Ni, 2-3% Mo. Enhanced resistance to pitting and crevice corrosion, especially from chlorides. | Marine environments, chemical processing, pharmaceutical equipment, coastal architectural facades. |
316H | S31609 | Higher carbon version of 316 for high-temperature service. | High-temperature, high-pressure chemical processes, power generation. |
317 / 317L | S31700 / S31703 | Higher Mo (~3-4%) than 316. Superior resistance to aggressive chemicals and sulfuric acid. | Pulp & paper industry, chemical processing with severe conditions. |
321 | S32100 | Stabilized with Titanium (Ti). Resists chromium carbide precipitation during welding, preventing intergranular corrosion. | Aircraft exhaust manifolds, expansion joints, furnace parts. |
347 | S34700 | Stabilized with Niobium (Nb). Similar to 321, with excellent intergranular corrosion resistance. | Welded assemblies in corrosive environments, high-temperature aircraft components. |
310 / 310S | S31000 / S31008 | High chromium (25%) and nickel (20%). Outstanding oxidation resistance at high temperatures. | Heat treating equipment, furnace components, radiant tubes. |
904L | N08904 | High-alloy austenitic (20-25% Cr, 24-26% Ni, 4-5% Mo, 1-2% Cu). Exceptional resistance to a wide range of acids, especially sulfuric. | Chemical processing, pollution control, seawater cooling, acid production. |
6Mo Super Austenitic (e.g., 254 SMO®) | S31254 | Very high Mo (6%), N addition. Extremely high resistance to pitting and crevice corrosion (PREN > 40). | Seawater desalination, offshore oil & gas, flue gas desulfurization, aggressive chemical environments. |
European Standard (EN/DIN) Grades
Material Number (EN) | Old DIN Designation | Common Name / Similar U.S. Grade | Key Features |
1.4301 | X5CrNi18-10 | AISI 304 | Standard austenitic grade, general purpose. |
1.4307 | X2CrNi18-9 | AISI 304L | Low carbon version of 1.4301, excellent weldability. |
1.4401 | X5CrNiMo17-12-2 | AISI 316 | Molybdenum-bearing for improved corrosion resistance. |
1.4404 | X2CrNiMo17-12-2 | AISI 316L | Low carbon version of 1.4401. |
1.4541 | X6CrNiTi18-10 | AISI 321 | Titanium-stabilized against intergranular corrosion. |
1.4571 | X6CrNiMoTi17-12-2 | AISI 316Ti | Titanium-stabilized molybdenum-bearing grade. |
1.4845 | X8CrNi25-21 | AISI 310S | High-temperature resistant grade. |
Japanese Industrial Standard (JIS) Grades
JIS Grade | Symbol | Similar U.S. Grade | Key Features |
SUS 304 | - | AISI 304 | General-purpose austenitic stainless steel. |
SUS 304L | - | AISI 304L | Low carbon version of SUS 304. |
SUS 316 | - | AISI 316 | Molybdenum-added for pitting resistance. |
SUS 316L | - | AISI 316L | Low carbon version of SUS 316. |
SUS 321 | - | AISI 321 | Titanium-stabilized grade. |
SUS 347 | - | AISI 347 | Niobium-stabilized grade. |
SUS 310S | - | AISI 310S | Heat and oxidation resistant grade. |
International Standards Compliance
BENKOO METAL seamless pipes are manufactured, tested, and certified to comply with a comprehensive range of international standards, ensuring global acceptance and performance reliability.
Product & Material Standards
Standard System | Standard Number | Title / Scope |
American (ASTM/ASME) | ASTM A213/A213M | Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes |
| ASTM A269/A269M | Seamless and Welded Austenitic Stainless Steel Tubing for General Service |
| ASTM A312/A312M | Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes |
| ASME SA213 / SA269 / SA312 | ASME Boiler and Pressure Vessel Code versions of ASTM standards. |
European (EN) | EN 10216-5 | Seamless steel tubes for pressure purposes – Part 5: Stainless steel tubes |
German (DIN) | DIN 17456 | Seamless circular stainless steel tubes – Technical delivery conditions |
Japanese (JIS) | JIS G3459 | Stainless steel pipes for ordinary piping |
| JIS G3463 | Stainless steel pipes for boiler and heat exchanger |
International (ISO) | ISO 1127 | Stainless steel tubes — Dimensions, tolerances and conventional masses per unit length |
| ISO 2037 | Stainless steel tubes for the food industry |
Supplementary & Testing Standards
Chemical Analysis: ASTM A484, EN 10088-1
Mechanical Testing: ASTM A370, ISO 6892-1
Hardness Testing: ASTM E10/E18, ISO 6506/6507/6508
Non-Destructive Testing (NDT): ASTM E213 (Ultrasonic), ASTM E426 (Eddy Current), EN 10246 series
Hydrostatic/Pressure Testing: ASTM A999, ISO 3458
Certification: EN 10204 3.1 / 3.2 Type Inspection Certificates
Applications of BENKOO METAL Austenitic Stainless Steel Pipes
Our seamless pipes are engineered for excellence in critical applications across multiple industries:
Industry Sector | Specific Applications | Recommended BENKOO METAL Grades |
Oil, Gas & Petrochemical | Process piping, heat exchanger tubes, refinery equipment, umbilicals, catalyst carrier tubes. | 316/316L, 317L, 904L, 6Mo Alloys (for severe chloride/acid service) |
Chemical & Pharmaceutical | Reactor vessels, distillation columns, transfer lines, clean utility piping (WFI, CIP), fermentation tanks. | 304/304L, 316/316L, 904L, Electropolished 316L for high purity. |
Food & Beverage | Processing lines, pasteurizers, mixing tanks, brewing vessels, dairy piping, sanitary fittings. | 304/304L, 316/316L (for salt/vinegar), highly polished finishes. |
Power Generation | Boiler tubes, feedwater heaters, condenser tubes, cooling water systems (fresh & seawater), FGD systems. | 304/304H, 316/316H, 321, 347, 6Mo Alloys for aggressive cooling water. |
Pulp & Paper | Digester piping, bleach plant equipment, paper machine showers, black liquor recovery lines. | 316L, 317L, 904L, 6Mo Alloys. |
Marine & Offshore | Seawater cooling pipes, ballast systems, deck piping, desalination plant tubing, offshore platform fittings. | 316L, 6Mo Super Austenitics (254 SMO®), Duplex grades for strength. |
Architecture & Construction | Handrails, curtain wall supports, roof cladding, structural elements in coastal areas. | 304, 316 (for high chloride/saline atmospheres). |
Automotive & Aerospace | Exhaust systems, fuel lines, hydraulic tubing, aircraft ducting and engine components. | 304, 321, 347 (for high-temp exhaust parts). |
Why Choose BENKOO METAL?
Extensive Grade Portfolio: From standard 304/316 to premium super austenitic alloys.
Global Standards Expertise: In-depth knowledge and compliance with ASTM, JIS, DIN, EN, and other major standards.
Superior Quality Assurance: Rigorous testing protocols including PMI, NDT, and hydrostatic testing ensure defect-free products.
Technical Support: Our engineering team provides expert guidance on material selection, corrosion resistance, and application design.
Reliable Supply Chain: Consistent inventory and efficient logistics to meet project timelines globally.
Customer-Centric Approach: Dedicated to providing tailored solutions and building long-term partnerships.
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