Stainless Steel 904L Flanges Manufacturer, Supplier and Exporter

What are Stainless Steel 904L Flanges?

Stainless Steel 904L Flanges are corrosion-resistant pipe connection components made from a super austenitic stainless steel grade containing high nickel, chromium, molybdenum, and copper. These flanges offer excellent resistance to chloride attack, pitting, crevice corrosion, and acidic environments. Common standards include ASTM A182 F904L and ASTM B649 UNS N08904, and they are widely used in chemical processing, marine, and oil & gas industries.

ASTM B649 UNS N0890 Flanges Suppliers

SS 904L Flanges are high-alloy, low-carbon stainless steel components designed for superior corrosion resistance in aggressive environments. These flanges are widely used in chemical processing, offshore platforms, marine systems, oil & gas, pharmaceutical plants, and heat exchangers where standard stainless steel grades may fail.

We supply and export premium quality SS 904L Flanges manufactured to international standards and engineered for reliable sealing, pressure handling, and long service life. Our range includes Alloy 904L Pipe Flanges, Superaustenitic 904L Flanges, and customized solutions in various pressure classes and dimensions.

Manufactured according to international specifications including ASTM B649 UNS N08904 Flanges, ASTM A182 F904L Flanges, and ASME SB649 Alloy 904L Flange, our products are available with complete material traceability and quality documentation.

What are SS 904L Flanges?

SS 904L Flanges are engineered pipe connection fittings used to connect valves, pumps, pipelines, and equipment safely and efficiently. Grade 904L is recognized for its enhanced resistance to sulfuric acid and chloride-rich conditions.

This material is often referred to as:

UNS N08904 Flange
WERKSTOFF NR. 1.4539 Flanges
Superaustenitic 904L Flanges
ASTM A182 F904L Flanges
ANSI B16.5 904L SS Flanges

Compared with conventional stainless steel grades, 904L provides greater durability in highly corrosive and high-temperature service environments.

Key Features and Benefits of Alloy 904L Pipe Flanges

Excellent resistance to pitting and crevice corrosion
High strength and long operational life
Strong performance in sulfuric and phosphoric acid environments
Reliable sealing under pressure
Excellent weldability and fabrication properties
Reduced maintenance and replacement costs
Suitable for elevated temperature applications

Types of Stainless Steel 904L Flanges We Supply

Our product range includes multiple configurations suitable for industrial applications.

SS 904L Slip On Flanges (SORF)

These flanges slide over the pipe and are welded internally and externally for reliable alignment and installation.

904L Stainless Steel Blind Flanges (BLRF)

Used to close the ends of piping systems and facilitate future maintenance and expansion.

ASTM B649 904L Weld Neck Flanges (WNRF)

Designed with a tapered hub that reduces stress concentration and improves performance under pressure and temperature cycles.

Alloy 904L Socket Weld Flange

Suitable for small-diameter high-pressure piping where leak prevention is critical.

SS 904L Threaded / Screwed Flanges

Installed without welding, making them useful for low-pressure and maintenance-sensitive applications.

Stainless Steel 904L Lap Joint Flanges

Commonly selected for systems requiring frequent dismantling and alignment flexibility.

UNS N08904 Ring Type Joint (RTJ) Flange

Built for high-pressure and high-temperature sealing applications.

904L SS Spectacle Blind Flange

Used for isolating pipeline sections while enabling operational flexibility.

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Stainless Steel 904L Flanges Specification

Specification	Details
Product	Stainless Steel 904L Flanges
Material Grade	Stainless Steel 904L
Standard	ASTM A182, ASTM B649, ASME SB649
UNS	UNS N08904
Werkstoff	1.4539
Flange Standard	ANSI B16.5, ASME B16.47
Size Range	½” NB to 48” NB
Pressure Class	150#, 300#, 600#, 900#, 1500#, 2500#
Surface Finish	RF, FF, RTJ
Manufacturing	Forged / Machined
Origin	India

Chemical Composition of Stainless Steel 904L Flanges

Element	Percentage
Chromium	19.0–23.0%
Nickel	23.0–28.0%
Molybdenum	4.0–5.0%
Copper	1.0–2.0%
Carbon	Max 0.02%
Iron	Balance

Mechanical Properties of ASTM A182 F904L Flanges

Property	Value
Tensile Strength	490 MPa
Yield Strength	220 MPa
Elongation	35%
Density	8.0 g/cm³
Hardness	Approx. 70–90 HRB

904L SS Flange Dimensions Chart

Nominal Size	Outside Diameter	Thickness
½”	90 mm	11 mm
1”	117 mm	13 mm
2”	152 mm	16 mm
4”	229 mm	24 mm
6”	279 mm	26 mm
8”	343 mm	30 mm

Applications of Stainless Steel 904L Flanges

Our Stainless Steel 904L Flanges are widely used across industries:

Chemical processing plants
Petrochemical industries
Oil and gas pipelines
Offshore and marine systems
Power generation facilities
Heat exchangers
Pharmaceutical manufacturing
Water treatment plants
Fertilizer industries
Pulp and paper processing

Manufacturing Process of Stainless Steel 904L Flanges

Related SS Flanges Grades

Why Choose Us for ASTM B649 UNS N08904 Flanges?

We focus on delivering reliable flange solutions that match project requirements and international quality expectations.

Wide inventory availability
Customized sizes and finishes
Competitive pricing
Export-grade packaging
Fast delivery schedules
Technical support from experienced teams
Consistent product quality

Whether you need standard ASME SB649 Alloy 904L Flange products or custom-engineered solutions, we support industrial requirements with dependable supply capabilities.

Global Reach

ASC LLP 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.

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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.