Last updated: 2025-12-26
Stainless steel material grades are defined by chemical composition, mechanical properties, and performance in different service environments. Selecting the correct stainless steel grade is critical for ensuring corrosion resistance, strength, temperature stability, and long service life in industrial applications.
We supply a full range of stainless steel materials including austenitic, stabilized, duplex, and super duplex grades. This page provides DIN / EN equivalents, key alloy characteristics, and typical applications to assist engineers and procurement professionals in material selection for flanges, pipes, fittings, and plates.
| ASTM / AISI | DIN / EN No. | UNS | Type | Key Alloy Feature | Typical Applications |
|---|---|---|---|---|---|
| 304 / 304L | 1.4301 / 1.4307 | S30400 / S30403 | Austenitic | General corrosion resistance, excellent weldability | General industry, food processing, piping systems |
| 316 / 316L | 1.4401 / 1.4404 | S31600 / S31603 | Austenitic | Mo added for chloride corrosion resistance | Chemical plants, marine/coastal, oil & gas |
| 317 / 317L | 1.4438 | S31700 / S31703 | Austenitic | Higher Mo than 316 for stronger pitting resistance | Chemical processing, pulp & paper, corrosive media |
| 316Ti | 1.4571 | S31635 | Stabilized Austenitic | Ti stabilized + Mo; good at elevated temperature service | Heat exchangers, chemical equipment, welded structures |
| 321 | 1.4541 | S32100 | Stabilized Austenitic | Ti stabilized for high-temperature resistance | High temperature piping, exhaust systems, petrochemical |
| 347 | 1.4550 | S34700 | Stabilized Austenitic | Nb stabilized for long-term high-temperature service | Power generation, boilers, refinery piping |
| 310S | 1.4845 | S31008 | Heat Resistant Austenitic | High Cr & Ni for oxidation resistance at high temperature | Furnaces, heat treatment, high-temp equipment |
| 904L | 1.4539 | N08904 | Super Austenitic | High Ni & Mo; strong resistance to acids and chlorides | Acid service, chemical plants, pollution control |
| Duplex 2205 | 1.4462 | S32205 / S31803 | Duplex | High strength; excellent SCC & pitting resistance | Offshore, seawater, oil & gas, desalination |
| Super Duplex 2507 | 1.4410 | S32750 | Super Duplex | Superior corrosion resistance in aggressive environments | Offshore oil & gas, seawater systems, chemical processing |
Note: DIN / EN equivalents are commonly used references. For critical projects, always confirm required specifications and certification documents.
Austenitic stainless steels such as 304, 316, 317, 316Ti, 321, 347, 904L and 310S are widely used due to their corrosion resistance, weldability, and formability. Stabilized grades (321, 347, 316Ti) are designed for elevated temperature service to reduce the risk of intergranular corrosion in welded structures.
Suggested reading:
Stainless Steel 304 vs 316
Stainless Steel 321 vs 347
Duplex 2205 and super duplex 2507 combine high strength with excellent resistance to stress corrosion cracking and pitting corrosion, making them ideal for offshore, marine, and aggressive chloride environments.
Suggested reading:
Duplex 2205 vs Super Duplex 2507
| Service Condition | Recommended Grades |
|---|---|
| General industrial use | 304 / 304L |
| Chloride environment (marine/coastal) | 316 / 316L, 317 / 317L, 316Ti |
| High temperature service | 321, 347, 310S |
| Strong acid service | 904L |
| Offshore / seawater / SCC risk | Duplex 2205, Super Duplex 2507 |
304 is a general-purpose austenitic stainless steel grade widely used for its good corrosion resistance, excellent weldability, and cost effectiveness. It is suitable for general industrial piping, food processing equipment, and standard stainless steel applications.
316 contains molybdenum (Mo), providing improved pitting and crevice corrosion resistance in chloride environments. It is commonly used in marine/coastal projects, chemical processing, and oil & gas piping systems where enhanced corrosion resistance is required.
317 is an austenitic stainless steel grade with higher molybdenum content than 316, offering stronger resistance to pitting corrosion. It is often selected for more corrosive chemical processing environments.
316Ti is a titanium-stabilized version of 316, designed to improve resistance to intergranular corrosion after welding and to enhance performance in elevated temperature service. It is widely used for heat exchangers and chemical equipment.
321 is a titanium-stabilized stainless steel grade suited for high temperature applications. It provides improved resistance to intergranular corrosion in welded structures exposed to elevated temperatures.
347 is niobium-stabilized stainless steel designed for continuous high temperature service, offering enhanced structural stability and suitability for power generation and refinery applications.
310S is a heat-resistant austenitic stainless steel with high chromium and nickel content, providing excellent oxidation resistance at high temperatures. It is commonly used in furnaces and heat-treatment equipment.
904L is a super austenitic stainless steel grade with high nickel and molybdenum content, offering excellent resistance to strong acids and chloride corrosion. It is commonly used in chemical plants and corrosion-critical equipment.
Duplex 2205 provides higher strength than austenitic stainless steels and excellent resistance to stress corrosion cracking. It is widely used in offshore, seawater systems, and desalination projects.
Super duplex 2507 offers superior corrosion resistance and strength for highly aggressive environments such as offshore oil & gas and seawater systems, providing long service life and reliable performance.
All stainless steel materials supplied comply with applicable ASTM, DIN, and EN standards. Chemical composition and mechanical properties are inspected under strict quality control. EN 10204 3.1 mill test certificates are available upon request.
Used for fluid and gas transportation and heat exchangers.
Common standards:
Austenitic: ASTM A312
Duplex / Super Duplex: ASTM A790
Used for pressure vessels, tanks, and fabrication.
Common standard:
ASTM A240
Used to connect pipes, valves, and equipment.
Common standards:
ASTM A182 (Material)
ASME B16.5 (Dimensions)
Used to change flow direction or pipe size.
Common standards:
Austenitic: ASTM A403
Duplex / Super Duplex: ASTM A815
17-4ph S17400 Round Bar Manufcturer
17-4ph Round Bar size range
Diameter Range: 3 mm to 300+ mm (1/8” to 12”+)
Lengths: 1 meter, 3 meter, 12 ft standard; or custom cut
Tolerances: as per ASTM/AMS specs
17-4ph S17400 ASTM A564 Grade 630 Round bar Read More »
ASTM A358 Tp316L CL 1 EFW Welded Pipe Manufacturer
ASTM A358 is the specification for electric fusion welded (EFW) austenitic stainless steel pipe suitable for high-temperature and corrosive environments.
Available in various sizes & schedules ( 10S, 40S, 80S, etc.)
Outer Diameter (OD): 8″ to 48″ (1200mm) or larger
Wall Thickness: Based on ASME B36.19 (for stainless steel)
ASTM A358 Tp316L CL 1 EFW Welded Pipe Read More »
ASTM A193 B6 Stud bolt Manufacturer
ASTM A193 Grade B6 refers to a martensitic class of stainless steel, AISI 410. which is Intended to make the stud bolt used in general purposes.
Standard Dimensions: ASME B18.2.1 / ASME B18.31.2
Threading: UNC (Coarse), UNF (Fine), or Metric per ASME B1.1 / B1.13M
Size: ¼ to 4″ [6-100 mm]
Length: Available in standard and custom cut lengths
ASTM A193 B6 Stud bolt AISI 410 with A194 gr.6 Hex nuts Read More »
Stainless steel Pipes/tubes are the most widely used due to their excellent corrosion resistance, high strength, and superior weldability. They are commonly found in oil & gas, chemical processing, pharmaceuticals, food & beverage, marine, and power plant applications.
You can find the general standard of stainless steel pipe & tubes
General Standard of Stainless Steel Pipes,Tubes Read More »
ASTM A453 Grade 660 is a high-strength, corrosion-resistant, austenitic stainless steel alloy designed for high-temperature and high-pressure applications. It is commonly used in power plants, petrochemical industries, aerospace, and offshore applications due to its superior strength and oxidation resistance at elevated temperatures.
Thread Type: UNC (Coarse), UNF (Fine), Metric (ISO)
Size:3/8″ to 4″ in imperial and upto M100 in metric sizes
Thread Standard: ASME B1.1 (Inch), ASME B1.13M (Metric)
ASTM A453 grade 660 A/B/C/D Stud Bolt,Hex Nuts Read More »