600LB/900LB SS Flange
High-Pressure Flanges for Critical Process Applications
SSM manufactures premium 600LB and 900LB stainless steel flanges that meet ASME B16.5 standards for the most demanding industrial applications. Our heavy-class flanges are engineered for refinery, petrochemical, and power generation systems requiring superior pressure containment.
600LB/900LB Flange Specifications
1. Technical Comparison
| Parameter | 600LB Flanges | 900LB Flanges |
|---|---|---|
| Size Range | ½" - 24" | ½" - 24" |
| Pressure Rating | 1440 psi @ 100°F | 2160 psi @ 100°F |
| Hub Thickness | 30-50% thicker than 300LB | 50-70% thicker than 300LB |
| Bolt Circle | Reinforced design | Extra-heavy pattern |
| Common Materials | 316L, 317L, 321 | 316L, 317L, 321, 347 |
2. Enhanced Design Features
| Feature | 600LB/900LB Benefits |
|---|---|
| Extended Hub | Better stress distribution |
| Precision RTJ Grooves | Metal-to-metal sealing |
| Thickened Flange Body | Higher pressure containment |
| Heavy Bolt Pattern | Maintains seal under vibration |
3. Pressure-Temperature Ratings
| Temp (°F) | 600LB (psi) | 900LB (psi) |
|---|---|---|
| 100 | 1440 | 2160 |
| 200 | 1310 | 1965 |
| 300 | 1200 | 1800 |
| 400 | 1100 | 1650 |
| 500 | 1100 | 1650 |
Manufacturing Process
Heavy-Duty Production
Special Alloy Selection - High-yield strength materials
Precision Forging - 10,000-ton hydraulic presses
Controlled Heat Treatment - For optimal microstructure
CNC Machining - ±0.025mm tolerance on critical surfaces
Non-Destructive Testing - Full UT/RT examination
Quality Assurance
100% Dimensional Verification
Positive Material Identification
Liquid Penetrant Inspection
Ultrasonic Testing (UT)
Radiographic Testing (RT) for 900LB
Hardness Testing Across Sections
Available Configurations
Flange Types
Weld Neck - Full penetration weld prep
RTJ Blind - High-pressure closures
Special Heavy Hub - For extreme conditions
Integral Reinforced - For cyclic service
Material Options
316L - Standard corrosion resistance
317L - Enhanced acid resistance
321/347 - High-temperature stability
Duplex 2205 - For chloride environments
Alloy 20 - Special chemical resistance
Industry Applications
Critical Service Uses
• Refinery high-pressure piping
• Petrochemical reactor systems
• Power plant steam headers
• Offshore production risers
• LNG processing equipment
Why Choose SSM Heavy-Class Flanges?
✔ Full ASME B16.5 Compliance
✔ Extra Material Certifications (NACE, PED)
✔ Radiographic Testing Standard on 900LB
✔ Competitive Lead Times for heavy-class flanges
✔ Engineering Support for critical applications
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