As a top supplier of SS904L stainless steel fittings and flanges, ZIZI specializes in providing high-quality products and professional services to domestic and foreign customers.
Recently, a key customer in Shanghai successfully signed a purchase order for SS904L stainless steel fittings and flanges with our company.
This customer is an A-level key customer of our company, with strict requirements for the supply chain, especially focusing on product quality, packaging, and transportation safety.
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Purchase Details
| ITEM | DESCRIPTION | QTY | UNIT |
| 1 | WNRF DN100 Sch 10S, #150, ASTM A182 F-904L, FORGED ASME B 16.5 | 38 | EA |
| 4 | WNRF DN100 SCH10S PN10 ASTM A182 F-904L FORGED | 26 | EA |
| 5 | ELBOW 90° LR BW SMLS ASTM A403-N08904/SS904L DN100 SCH10S ASME B16.9 | 15 | EA |
| 6 | REDUCER CONCENTRIC DN125 X DN100 SCH10S ASTM A403-N08904/SS904L SMLS ASME B16.9 | 10 | EA |
| TOTAL | 89 | EA |
ASTM A403-N08904 Stainless Steel Buttwelding Pipe Fittings
Benefit of SS904L Stainless Steel
The benefit of N08904 (904L) stainless steel stem from its high alloying composition, including:
Excellent corrosion resistance
Excellent resistance to pitting and crevice corrosion
Good mechanical performance
Machinability and weldability
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu |
| ASTM A403 WP904L | MIN | 23.00 | 19.00 | 4.00 | 1.00 | ||||||
| MAX | 0.02 | 2.00 | 0.045 | 0.035 | 1.00 | 28.00 | 23.00 | 5.00 | 0.10 | 2.00 |
Mechanical Properties
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % |
| ASTM A403 N08904(SS904L) | 490 min | 220 min | 28 min |
ASME B16.9 Butt Weld Pipe Fittings
ASME B16.9 is one of the main production standards for stainless steel butt welded pipe fittings in the United States.
Its scope of application covers nominal sizes ranging from 1/2 inch to 48 inches.
Wall thickness ranges including SCH 10-SCH 160, XXS.
There are various types of products, including butt weld elbows, tees, reducers, caps and stub ends. Which are compatible with various materials such as carbon steel, stainless steel, and alloy steel, and are widely used in various industrial pipeline fields.
Types of Butt Weld Pipe Fittings
There are multiple product types of ASME B16.9 butt weld fittings available for use in pipeline systems with different design requirements.
The common types of butt welded pipe fittings include: 90 degree elbow, 45 degree elbow, tee, cross, cap, concentric reducer, eccentric reducer, stub end.
BW Elbow: used to change the direction of pipeline systems. Diverse product types:
According to the radius: long radius elbow (LR=1.5D) and short radius elbow (SR=1D);
According to the bending angle: 45 degree elbow, 90 degree elbow, and 180 degree elbow;
According to the process: push bending, hot pressing bending, and welded.
Stainless Steel Equal and Reducing tee: used to connect the main and branch pipes in pipeline systems to achieve medium diversion. The appearance is T-shaped, and it is divided into equal tees, reducing tees, and 45 degree lateral tees (Y-shaped tees) according to the diameter size.
Pipe Reducer: The diameters of the pipe ends are different, with one end larger and the other end smaller. Welding reducers are mainly used to connect pipes of different diameters, including two types: concentric reducers and butt eccentric reducers.
Stainless Steel Pipe Cap: Used to seal the end of the pipeline.
SS904L Forged Fittings
Stainless steel forged fittings are pipe fittings made of materials such as stainless steel round bars or steel billets, which have excellent corrosion resistance, high temperature resistance, and high pressure resistance.
ASTM A182 F904L is a forged high alloy austenitic stainless steel (SS904L). By adding copper (Cu) and higher nickel (Ni) and molybdenum (Mo) content, its corrosion resistance far exceeds that of conventional 316/316L stainless steel.
ASTM A182 F904L Material Properties
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 |
Mechanical Properties
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % |
| ASTM A182 F904L (N08904) | 490 min | 215 min | 35 min |
Anti total corrosion
Resistance to localized corrosion
Stress corrosion cracking resistance
Good mechanical performance
Weldability and processability
ASME B16.11 Standard
ASME B16.11 standard for the production of forged fittings is developed by the American Society of Mechanical Engineers and is globally applicable.
It specifies the design, material, dimensional tolerances, pressure and temperature ratings, etc. of forged socket weld and threaded fittings (NPS 1/8-4) and requires non-destructive testing and hydrostatic testing to ensure the safety and reliability of the fittings.
The pressure rating of socket weld fittings is divided into Class 3000, Class 6000, and Class 9000.
Threaded fittings are Class 2000, Class 3000, and Class 6000.
Types of Forged Pipe Fitting
Stainless steel forged fittings are mainly divided into two categories: forged socket weld fittings and forged threaded fittings.
Types of socket welded pipe fittings:
Socket 45deg elbow, 90deg elbow,tee, cross, full coupling, half coupling,cap,union, etc.
Types of threaded fittings:
Threaded 45deg elbow, 90deg elbow,tee, cross, coupling, cap, plug, bushing, nipple,hex nipple, etc.
ASTM A182 F904L Stainless Steel Wled Neck Flange
Weld neck flange made of ASTM A182 F904L material is a high-performance pipeline connection component used in strong corrosion conditions. It combines the excellent corrosion resistance of 904L alloy with the reliable structural integrity of butt welded connections, making it an important component for flange connections in harsh environments such as chemical, petrochemical, and offshore platforms.
ASME B16.5 Standard for Forged Steel Flanges
ASME B16.5 “Pipe Flanges and Flanged Fittings” is one of the important production standards for butt welded flanges.
Product types: WN Flange, SO Flange, SW Flange, TH Flange, LAPJ Flange, Blind Flange.
Size range: from DN15 (1/2 “) to DN600 (24”), and even larger (but B16.5 mainly covers up to 24 inches).
Pressure rating: includes seven levels: Class 150, 300, 400, 600, 900, 1500, and 2500.
Sealing surface form: such as protruding surface (RF), flat surface (FF), ring connecting surface (RTJ), etc.
ASME B16.5 Welding Flange Specification and Dimensions
Class 150 Weld Neck Flange Dimension
| Nominal Pipe Size | A | B | C | D | E | F | G | H | I | J | Weight | |
| inch | mm | mm | mm | mm | mm | mm | mm | mm | Holes | mm | mm | kg / piece |
| 1/2 | 21.30 | 88.90 | 15.70 | 11.20 | 47.80 | 21.30 | 30.20 | 35.00 | 4 | 15.70 | 60.45 | 0.48 |
| 3/4 | 26.70 | 98.60 | 20.80 | 12.70 | 52.30 | 26.70 | 38.10 | 42.90 | 4 | 15.70 | 69.85 | 0.71 |
| 1 | 33.40 | 108.0 | 26.70 | 14.20 | 55.60 | 33.50 | 49.30 | 50.80 | 4 | 15.70 | 79.25 | 1.01 |
| 11/4 | 42.20 | 117.3 | 35.10 | 15.70 | 57.15 | 42.20 | 58.70 | 63.50 | 4 | 15.70 | 88.90 | 1.33 |
| 11/2 | 48.30 | 127.0 | 40.90 | 17.50 | 62.00 | 48.30 | 65.00 | 73.15 | 4 | 15.70 | 98.60 | 1.72 |
| 2 | 60.30 | 152.4 | 52.60 | 19.10 | 63.50 | 60.45 | 77.70 | 91.90 | 4 | 19.10 | 120.7 | 2.58 |
| 21/2 | 73.00 | 177.8 | 62.70 | 22.40 | 69.85 | 73. 15 | 90.4 | 104.6 | 4 | 19.10 | 139.7 | 4.11 |
| 3 | 88.90 | 190.5 | 78.00 | 23.90 | 69.85 | 88.90 | 108.0 | 127.0 | 4 | 19.10 | 152.4 | 4.92 |
| 31/2 | 101.6 | 215.9 | 90.20 | 23.90 | 71.40 | 101.6 | 122.2 | 139.7 | 8 | 19.10 | 177.8 | 6.08 |
| 4 | 114.3 | 228.6 | 102.40 | 23.90 | 76.20 | 114.3 | 134.9 | 157.2 | 8 | 19.10 | 190.5 | 6.84 |
| 5 | 141.3 | 254.0 | 128.3 | 23.90 | 88.90 | 141.2 | 163.6 | 185.7 | 8 | 22.40 | 215.9 | 8.56 |
| 6 | 168.3 | 279.4 | 154.2 | 25.40 | 88.90 | 168.4 | 192.0 | 215.9 | 8 | 22.40 | 241.3 | 10.6 |
| 8 | 219.1 | 342.9 | 202.7 | 28.40 | 101.6 | 219.2 | 246.1 | 269.7 | 8 | 22.40 | 298.5 | 17.6 |
| 10 | 273.0 | 406.4 | 254.5 | 30.20 | 101.6 | 273.0 | 304.8 | 323.8 | 12 | 25.40 | 362.0 | 24.0 |
| 12 | 323.8 | 482.6 | 304.8 | 31.75 | 114.3 | 323.8 | 365.3 | 381.0 | 12 | 25.40 | 431.8 | 36.5 |
| 14 | 355.6 | 533.4 | To be specified by the Purchaser | 35.10 | 127.0 | 355.6 | 400.1 | 412.7 | 12 | 28.40 | 476.3 | 48.4 |
| 16 | 406.4 | 596.9 | 36.60 | 127.0 | 406.4 | 475.2 | 469.9 | 16 | 28.40 | 539.8 | 60.6 | |
| 18 | 457.2 | 635.0 | 39.60 | 139.7 | 457.2 | 505.0 | 533.4 | 16 | 31.75 | 577.9 | 68.3 | |
| 20 | 508.0 | 698.5 | 42.90 | 144.5 | 508.0 | 558.8 | 584.2 | 20 | 31.75 | 635.0 | 84.5 | |
| 24 | 609.6 | 812.8 | 47.80 | 152.4 | 609.6 | 663.4 | 692.1 | 20 | 35.10 | 749.3 | 115 | |