Stainless Steel 904L Flanges
- Superior Corrosion Resistance: Particularly in chloride settings, 904L material provides outstanding resistance to pitting, crevice, and stress corrosion cracking.
- Custom Sizes: Available in diameters ranging from 2” to 24” and customized thicknesses to meet specific project needs.
- Seamless Traceability: Completely traceable thanks to strict inspection procedures and ISO 9001 quality management.
- Adaptable Uses: It can be used in many different industries, including as power generating, shipbuilding, chemicals, and petroleum.
Technical Specifications
| Item | Specification |
| Product Name | 904L Flanges |
| Material | 904L Stainless Steel |
| Flange Types | Slip-on, Welding Neck, Socket, Threaded, Blind, Spectacle Blind |
| Manufacturing Standards | ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 |
| Flange Sizes | 2” – 24” |
| Pressure Grades | Class 150~ Class 2500 |
| Tolerance | ±0.05 mm |
| Material Standards | ANSI, ISO, JIS, DIN, BS, GB, SH, HG, QOST |
| Application | Petroleum, Chemical, Shipbuilding, Metallurgy, Power Generation |
| Sample Availability | 2 pcs free samples available |
| Lead Time | 15-35 days |
| Quality Control | ISO 9001:2008, PMI, PT, MT, UT, RT, VT |
| Testing Reports | 3.1/3.2 Mill Test Reports available |
Raw Materials
We produce and purchase raw materials strictly according to customer requirements, ensuring full compliance with project specifications, mechanical properties, and international standards.
Main steel grades we produce:
Steel Grade | Standards | Classification | Products |
1.4301, 1.4307, 1.4401, 1.4404, 1.4541, 1.4871 | EN 10222-5 | L | Forged flanges and Forged parts |
F304, F304L, F316, F316L, F321, F316T, F310, F904L | ASTM A182 | L | Forged flanges and Forged parts |
F51, F53, F55, F60 | ASTM A182 | L | Forged flanges and Forged parts |
LF2 | ASTM A350 | V | Forged flanges and Forged parts |
F11, F22 | ASTM A182 | V | Forged flanges and Forged parts |
A105 | ASTM A105 | N | Forged flanges and Forged parts |
CNC Machining Capabilities
We operate multiple machining lines and CNC centers engineered to deliver tight tolerances, superior surface finishes, and consistent quality for complex forged components.
Equipments and Quantities | ||
Item No. | Equipments | Quantities |
1 | Ramp CNC lathe | 6 |
2 | Normal lathe | 8 |
3 | Machining center | 4 |
4 | CNC lathe | 10 |
Inspection & Quality Control
To ensure the high quality of non-standard flanges, we are equipped with professional testing and inspection systems:
- 3D Measurement Equipment
- Ultrasonic Cleaning Machine
- Physical & Chemical Testing
- Dimensional Inspection
Packaging for Non-Standard Flanges
We provide protective packaging options according to customer needs:
- Anti-rust treatment
- Plastic film wrapping
- Wooden cases
- Wooden pallets
- Custom packaging available
Why Choose Boberry
Complete In-House Manufacturing
Integrated forging, heat treatment, machining, and inspection ensure stable quality, faster lead times, and full control over every production stage.
European-Market Proven Quality
Long-term supply to Germany, Austria, Switzerland, and Nordic countries demonstrates our ability to meet strict technical standards and customer expectations.
Custom Engineering Support
Tailor-made stainless-steel parts based on your drawings, with trial samples available to validate design, performance, and fit before full-scale production.