| Customization: | Available |
|---|---|
| Standard: | ANSI, DIN, GB, JIS, GOST, BSW, ISO |
| Type: | Alloy Steel Flange |
|
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Primary Standard: ASTM A182 (Forged Steel Pipe Flanges, Fittings, Valves)
Complementary Standards:
ASME B16.5 (Dimensions for NPS ½"-24")
NACE MR0175 (Sour Service Compliance)
EN 1092-1 (EU Flange Standard)
| Parameter | Tolerance (ASME B16.5) |
|---|---|
| OD Tolerance | ±1.5 mm (≤24") / ±3 mm (>24") |
| Bolt Hole Spacing | ±0.8 mm (≤24") / ±1.5 mm (>24") |
| Thickness | +3 mm, -1 mm |
High-Temp Resistance - F91 (9Cr-1Mo-V) withstands 593°C in power plants
Corrosion Resistance - F316 (Mo-added) resists pitting in chloride environments
Sour Service - NACE-compliant F22/F316L for H2S applications
Chemical Composition (Key Grades):
| Grade | Cr | Ni | Mo | C |
|---|---|---|---|---|
| F304 | 18-20% | 8-11% | - | ≤0.08% |
| F316 | 16-18% | 10-14% | 2-3% | ≤0.08% |
| F91 | 8-9.5% | - | 0.85-1.05% | 0.08-0.12% |
Mechanical Tests:
F316: Hardness ≤217 HB, Tensile ≥515 MPa
F91: Tensile ≥585 MPa, Yield ≥415 MPa
Oil & Gas: Wellhead flanges (F22/F316)
Power Plants: Steam headers (F91)
Chemical Processing: Acid lines (F316L)
Export Packaging: Edge protectors + waterproof wrapping
Certification: EN 10204-3.1 MTC with PMI report
| Service Condition | Recommended Grade |
|---|---|
| General Corrosion | F304/F304L |
| Chloride Exposure | F316/F316L |
| High-Temp Steam | F91 |
Stainless Steel: Solution Annealed at 1010-1120°C + Quench
Alloy Steel: Normalized at 950-980°C + Tempered at 730-780°C
Material required for flanges and flanged fittings commonly are:
| Equipment |
| 3-axis, 4-axis and full 5-axis processing equipment, CNC lathe, centering machine, turning and milling compound, wire cutting, EDM, grinding, etc |
| Processing |
| CNC machining, CNC Turning, CNC Milling, Welding, Laser Cutting, Bending, Spinning, Wire Cutting, Stamping, Electric Discharge Machining (EDM), Injection Molding |
| Our Advantages |
| 1)24 hours online service & Quickly Quote/Delivery. 2)100% QC quality inspection before delivery, and can provide quality inspection form. 3)10+ years of experience in the CNC machining area and have a senior design team to offer perfect modification suggestions |
| Quality Assurance |
| 100% Inspect Before Shipment, ISO9001:2015, ISO13485:2016, SGS, RoHs, TUV |
| Serface Treatment |
| Aluminum parts:Clear Anodized, Color Anodized, Sandblast Anodized, Chemical Film, Brushing, Polishing Stainless Steel parts:Polishing, Passivating, Sandblasting, Laser engraving, Electrophoresis black, Oxide black Steel parts:Zinc Plating, Oxide black, Nickel Plating, Chrome Plating, Carburized, Heat treatment Brass parts:Nickel Plating, chrome plating, Electrophoresis black, Oxide black, Powder coated |
The pressure-temperature rating is the maximum allowable working pressure (bar unit) of the material and grade used at the rated temperature (Celsius).
Whether flange joints are used at high or low temperatures, leakage due to external forces and moments generated by the connected piping or equipment should be considered. To prevent leakage, pipe flanges and flanged fittings should avoid the application of severe external loads and sharp thermal gradients.
Application at temperatures in the creep range will result in decreasing bolt loads as relaxation of flanges, bolts, and gaskets takes place. Flanged joints subjected to thermal gradients may likewise be subject to decreasing bolt loads. Decreased bolt loads diminish the capacity of the flanged joint to sustain loads effectively without leakage. At temperatures above 200°C (400°F) for Class 150 and above 400°C (750°F) for other class designations, flanged joints may develop leakage problems unless care is taken to avoid imposing severe external loads, severe thermal gradients, or both.
Some materials, especially some carbon steel materials, exhibit a significant decrease in ductility when used at low temperatures, and thus cannot withstand impact load, sudden stress changes, and high stress concentrations. Some regulations require an impact test even when the temperature is above -29 °C (−20°F).
No pressure test is required on the flange.
Flanged fitting should be tested for shell pressure.
Shell Pressure Test for Flanged Fittings
The shell pressure test for flanged fittings shall be at a pressure no less than 1.5 times the 38°C (100°F) pressure rating rounded off to the next higher 1 bar (25 psi) increment.
|
Flanged Fittings Size |
Duration, Sec |
|---|---|
|
NPS ≤ 2 |
60 |
|
2 1/2 ≤ NPS ≤ 8 |
120 |
|
NPS ≥ 10 |
180 |
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