Stainless Steel 904L Flanges: Overview, Properties, and Advantages
Welcome to ASC LLP, your trusted partner for high-quality stainless steel products. In this article, we delve into the specifics of Stainless Steel 904L Flanges, including their properties, advantages, and applications. If you’re looking for durable and high-performance flanges for demanding environments, 904L stainless steel flanges are an excellent choice.
What are 904L Stainless Steel Flanges?
904L Stainless steel flanges are integral components in piping systems, used to connect pipes and equipment. These flanges are manufactured from 904L stainless steel, providing all the inherent benefits of this high-performance material. Their robust properties make them ideal for use in demanding applications, including chemical processing, petrochemical industries, and marine environments.

Properties of 904L Stainless Steel Flanges
- Corrosion Resistance: 904L stainless steel flanges exhibit excellent resistance to various forms of corrosion, including pitting, crevice corrosion, and stress corrosion cracking. This makes them suitable for use in harsh environments where other materials might fail.
- High Strength: The high tensile strength of 904L stainless steel ensures that the flanges can withstand significant pressure and mechanical stress, making them durable and reliable under extreme conditions.
- Heat Resistance: These flanges maintain their structural integrity and performance even at elevated temperatures, making them suitable for applications involving high heat.
- Non-Magnetic: Unlike some stainless steels, 904L is non-magnetic, which is advantageous in certain industrial applications where magnetic properties can interfere with processes.
- Excellent Formability: 904L stainless steel can be easily formed into complex shapes, allowing for the production of flanges with intricate designs and specifications.
Advantages of 904L Stainless Steel Flanges
- Superior Durability: The exceptional corrosion resistance and strength of 904L stainless steel flanges ensure a long service life, reducing the need for frequent replacements and maintenance.
- Enhanced Safety: By providing reliable connections in piping systems, 904L stainless steel flanges contribute to the safety and efficiency of industrial operations, minimizing the risk of leaks and failures.
- Cost-Effective: While 904L stainless steel may have a higher initial cost compared to other materials, its durability and resistance to corrosion can lead to significant cost savings over time due to reduced maintenance and replacement needs.
- Versatility: These flanges are suitable for a wide range of applications, from chemical processing and oil refining to marine and power generation industries.
- Compliance with Standards: 904L stainless steel flanges are manufactured in accordance with industry standards, ensuring compatibility and reliability across various applications and systems.


Schedule and Size Chart
Nominal Pipe Size (NPS) | Schedule Number | Outer Diameter (OD) (inches) | Flange Thickness (inches) | Bolt Circle Diameter (BCD) (inches) | Number of Bolts |
1/2″ | SCH 40 | 2.875 | 0.75 | 3.875 | 4 |
1″ | SCH 40 | 4.000 | 0.75 | 5.500 | 4 |
2″ | SCH 40 | 6.000 | 0.75 | 7.500 | 4 |
3″ | SCH 40 | 8.625 | 0.75 | 9.625 | 4 |
4″ | SCH 40 | 10.750 | 0.75 | 11.750 | 8 |
6″ | SCH 40 | 15.000 | 0.75 | 15.750 | 8 |
8″ | SCH 40 | 18.000 | 0.75 | 19.750 | 8 |
Mechanical Properties Chart
Property | Value |
Tensile Strength | 670 MPa (97,000 psi) |
Yield Strength | 500 MPa (72,500 psi) |
Elongation | 40% |
Hardness | 215 HB (Rockwell B) |
Modulus of Elasticity | 200 GPa (29,000 ksi) |
Specifications Chart
Specification | Value |
Material | 904L Stainless Steel |
Standard | ASTM B564, ANSI B16.5 |
Type | Slip-on, Weld Neck, Blind, Threaded |
Finish | Plain, Raised Face, Flat Face |
Pressure Rating | 150, 300, 600, 900, 1500 |
Chemical Composition Chart
Element | Percentage (%) |
Chromium (Cr) | 19.0 – 23.0 |
Nickel (Ni) | 23.0 – 28.0 |
Molybdenum (Mo) | 4.0 – 5.0 |
Copper (Cu) | 1.0 – 2.0 |
Carbon (C) | ≤ 0.020 |
Manganese (Mn) | ≤ 2.0 |
Silicon (Si) | ≤ 1.0 |
Sulfur (S) | ≤ 0.020 |
Phosphorus (P) | ≤ 0.045 |
Physical Properties Chart
Property | Value |
Density | 8.00 g/cm³ (8000 kg/m³) |
Melting Point | 1400 – 1450°C (2552 – 2642°F) |
Thermal Conductivity | 15.0 W/m·K |
Thermal Expansion | 16.0 x 10⁻⁶ /°C |
Electrical Resistivity | 0.72 µΩ·m |
Application Chart
Industry | Applications |
Chemical Processing | Handling of aggressive chemicals and acids |
Petrochemical | Equipment in refineries and oil rigs |
Marine | Components in seawater environments |
Power Generation | High-temperature and pressure systems |
Pharmaceutical | Hygienic and corrosion-resistant applications |
Why Choose ASC LLP?
At ASC LLP, we pride ourselves on offering top-quality stainless steel products, including 904L stainless steel flanges. Our commitment to excellence is reflected in the following:
- Quality Assurance: We source our materials from reputable suppliers and adhere to strict quality control processes to ensure that our flanges meet the highest industry standards.
- Expertise: Our team of professionals has extensive experience in the industry, allowing us to provide expert advice and tailored solutions for your specific needs.
- Customer Service: We are dedicated to delivering exceptional customer service, from providing detailed product information to assisting with your order and delivery requirements.
- Competitive Pricing: We offer competitive pricing without compromising on quality, ensuring that you receive the best value for your investment.
- Custom Solutions: If you require custom flanges or specific configurations, our skilled team can accommodate your requirements, ensuring that you get precisely what you need.
At ASC LLP, we are committed to providing high-quality 904L SS flanges that meet the rigorous demands of various industrial applications. Our flanges offer superior corrosion resistance, strength, and durability, making them a reliable choice for critical systems.
If you have any questions or need further information about our 904L SS flanges, feel free to contact us. Our team of experts is here to help you find the right solutions for your needs.
Explore our range of SS flanges 904L and experience the unmatched performance and reliability that our products offer. Whether you’re looking to enhance the efficiency of your operations or ensure long-term durability, our 904L flanges are the perfect choice for your high-performance requirements.
Global Reach
Amardeep Steel Centre boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality Stainless Steel 904L Flanges. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.

Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.