In early April, we received an order for stainless steel 904L flange from an Italian regular customer. This order requires to purchase EN1092-1 standard stainless steel 904L butt welding flange, plate flange, and blind flange, with a pressure of PN40. The customer was also exposed to stainless steel 904L material for the first time. We patiently answered their questions about the material and provided testing reports for chemical composition and mechanical properties according to the material standards, thus winning the customer’s trust. We quickly received an order from the customer.
Purchase Order List
| Description of Goods |
| FLG EN1092-1/11/C 1.4539 ( 904L ) SCH.40 PN 16/40 DN25 |
| FLG EN1092-1/11/C 1.4539 ( 904L ) SCH.40 PN 16/40 DN40 |
| FLG EN1092-1/11/C 1.4539 ( 904L ) SCH.40 PN40 DN50 |
| FLG EN1092-1/11/C 1.4539 ( 904L ) SCH.40 PN40 DN100 |
| FLG EN1092-1/01/C 1.4539 ( 904L ) PN 25 DN300 |
| FLG EN1092-1/01/D 1.4539 ( 904L ) PN 25 DN300 |
| FLANGIA EN1092-1/05/D – DN25 PN40 – 1.4539 (904L) |
| FLANGIA EN1092-1/05/D – DN40 PN40 – 1.4539 (904L) |
| FLANGIA EN1092-1/05/D – DN50 PN40 – 1.4539 (904L) |
ASTM A182 F904L Flange
Stainless steel 904L flange is forged from ASTM A182 F904L stainless steel material, which contains 23% nickel and 19% chromium in its chemical composition. Other important elements include carbon, manganese, silicon, phosphorus, sulfur, copper, and 4% molybdenum. This helps it demonstrate excellent performance under corrosive conditions. ASTM A182 F904L flange is a key component in the pipeline system, and its excellent performance can ensure the safe and stable operation of the pipeline system.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu |
| ASTM A182 F904L (N08904) | MIN | 23.00 | 19.00 | 4.00 | 1.00 | ||||||
| MAX | 0.02 | 2.00 | 0.040 | 0.030 | 1.00 | 28.00 | 23.00 | 5.00 | 0.10 | 2.00 |
ASTM A182 F904L flange contains a high proportion of elements such as nickel, chromium, and molybdenum, which give it excellent corrosion resistance. It can resist the erosion of various acid, alkali, and salt media, especially in high temperature and high pressure environments.
Mechanical Properties
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % |
| ASTM A182 F904L (N08904) | 490 min | 215 min | 35 min |
Stainless steel 904L flange also has good resistance to stress corrosion cracking, making it widely used in various industries.
How to Inspect of Stainless Steel 904L Flange
The process of inspecting stainless steel 904L flanges usually involves multiple aspects to ensure that their quality, chemical composition, mechanical properties, and corrosion resistance comply with relevant standards and regulations. Here are some common inspection steps and methods:
1.Chemical composition testing:
Use spectroscopic or chemical analysis methods to test the chemical composition of stainless steel 904L flange, ensuring that the content of key elements such as nickel, chromium, and molybdenum meets the requirements of ASTM A182 F904L or other relevant standards.
2.Mechanical performance inspection:
Tensile test: tests the tensile strength, yield strength, and elongation of the flange.
Impact test: Evaluate the toughness of flanges at low temperatures.
Hardness testing: To measure the hardness of a flange through Brinell, Rockwell, or Vickers hardness testing.
3.Non destructive testing:
Ultrasonic testing (UT): Check for defects inside the flange, such as cracks, inclusions, etc.
Radiographic Testing (RT): Inspection of welding areas or other critical parts of flanges for defects using X-rays or gamma rays.
Magnetic particle testing (MT) or penetration testing (PT): used to detect cracks or other defects on the surface of flanges.
4.Dimensional inspection:
Use measuring tools (such as calipers, gauges, etc.) to check whether the outer diameter, inner diameter, thickness, bolt hole spacing, and other dimensions of the flange meet the standards or design requirements.
5.Appearance inspection:
Visually inspect the surface quality of the flange, including any defects such as rust, scratches, cracks, etc.
Check if the marking of the flange is clear, including material grade, specifications, size, pressure, manufacturer information, etc.
Types of EN1092-1 Flange
EN1092-1 is a flange standard of European.Its specifies requirements for the dimensions, types, materials, and manufacturing of flanges under different pressure levels. This standard ensures the interchangeability and compatibility of flanges, allowing pipe fittings produced by different manufacturers to be smoothly connected. EN1092-1 flanges include a variety of flange types, such as TYPE01 plate flanges; TYPE02 loose plate flanges with weld on plate collar or for lapped pipe end; TPYE05 blind flanges; TYPE11 butt welding flanges; and so on. Each type has different dimensional requirements, such as flange diameter, flange thickness, bolt hole diameter, and bolt quantity.
| Type No | Description |
| 01 | Plate flange for welding |
| 02 | Loose plate flange with weld-on plate collar or for lapped pipe end |
| 04 | Loose plate flange with weld-neck collar |
| 05 | Blind flange |
| 11 | Weld-neck flange |
| 12 | Hubbed slip-on flange for welding |
| 13 | Hubbed threaded flange |
| 21a | Integral flange |
| 32 b | Weld-on plate collar |
| 33 a,b | Lapped pipe end |
| 34 b | Weld-neck collar |
| 35 b | Weldring neck |
| 36 b | Pressed collar with long neck |
| 37 b | Pressed collar |
| NOTE Type numbers have been made non-consecutive to permit possible future additions. | |
| a This is an integral part of a pressure equipment or a component. b Type numbers 32,33,35,36 and 37 are for use with type 02 flanges and type number 34 for use with type 04 flanges. | |
Stainless Steel 904L Flange Application
Oil and Gas Industries
Food Processing Industries
Pipeline
Power Industries
Ship Building Industries
Paper Industries
Cement Industries
Chemical Industries
Zizi Engineering Co Ltd is a leading industrial Pipes Fittings & Flanges supplier for construction, petrochemical and oilfield customers. Stainless steel 904L flange is one of our main products. We specialize in foreign trade business and have rich experience in serving customers. We not only provide customers with high-quality products, but also customers provide value-added services such as quality inspection, packaging, and transportation. With years of product experience and meticulous and comprehensive services, we won the trust of many regular customers.