300LB High-pressure SS Flange

300-Pound Pressure Rated Flanges for Demanding Industrial Applications SSM manufactures premium 300LB stainless steel flanges that meet ASME B16.5 standards for high-pressure piping systems. Our flanges are engineered for critical service applications in oil & gas, petrochemical, and power...

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Product Introduction

300-Pound Pressure Rated Flanges for Demanding Industrial Applications

SSM manufactures premium 300LB stainless steel flanges that meet ASME B16.5 standards for high-pressure piping systems. Our flanges are engineered for critical service applications in oil & gas, petrochemical, and power generation industries.

300LB Flange Technical Specifications

1. Key Parameters

Specification	Details
Pressure Rating	300 psi at 100°F (720 psi at ambient)
Size Range	½" to 24" (DN15 to DN600)
Temperature Range	-20°F to 850°F (-29°C to 454°C)
Face Types	Raised Face (RF), Ring Joint (RTJ)
Material Grades	ASTM A182 F304/L, F316/L, F321, F347

2. Enhanced Design Features

Feature	Benefit
Thicker Hub Section	Increased pressure containment
Precision Machined RTJ Grooves	Superior high-pressure sealing
Reinforced Bolt Circle	Higher load capacity
Smoother Weld Bevel	Better weld integrity

3. Pressure-Temperature Chart

Temperature (°F)	Max Working Pressure (psi)
100	720
200	655
300	600
400	550
500	550

Manufacturing Excellence

Production Process

Material Certification - ASTM A182 compliant

Heavy-Duty Forging - For superior grain structure

Precision Machining - CNC-controlled to ±0.05mm

Heat Treatment - Solution annealed for corrosion resistance

Quality Validation - Full NDE testing protocol

Quality Assurance Tests

100% Dimensional Verification

Positive Material Identification (PMI)

Liquid Penetrant Inspection

Ultrasonic Testing (UT)

Hardness Testing (HRB scale)

Hydrostatic Testing (optional)

Available Configurations

Flange Types

Weld Neck - For highest pressure integrity

Slip-On - With reinforced hub design

Blind - High-pressure closures

Special RTJ - For ring-type joint gaskets

Material Options

304/304L - General high-pressure service

316/316L - Enhanced corrosion resistance

321/347 - High-temperature stability

Duplex/Super Duplex - Special order

Industry Applications

Critical Service Uses

• Oil & gas production systems
• Refinery high-pressure piping
• Chemical reactor connections
• Power plant steam lines
• Offshore platform piping

Why Choose SSM 300LB Flanges?

✔ ASME B16.5 Certified
✔ Heavy-Wall Construction for safety margins
✔ Full Material Traceability
✔ Competitive Lead Times
✔ Technical Support for high-pressure applications

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