Flange Materials
Comprehensive guide to flange materials from carbon steel to exotic alloys. Technical properties, specifications, and application selection guidance.
Explore MaterialsMaterial Categories
Select the right material for your application's temperature, pressure, and corrosion environment.
Carbon Steel
Industry-standard material for most industrial applications. Cost-effective and reliable for moderate temperatures and pressures. ASTM A105 and A350 LF2 are primary grades.
Temperature Range:
-20°F to 650°F
Primary Use:
General industrial piping
Stainless Steel
Excellent corrosion resistance for corrosive environments, chemical processing, and food/pharma applications. A182 F304 and F316 are most common.
Temperature Range:
-20°F to 1000°F (with derating per ASME B16.5 Table 2-2.X)
Primary Use:
Corrosive and food service environments
Alloy Steel
Chrome-molybdenum steel for elevated temperature service. Essential for power generation, steam systems, and high-temperature piping.
Temperature Range:
Up to ~1200°F for F91; F22 to ~1050°F; F11 to ~900°F continuous service per ASME B31.3
Primary Use:
Power generation and high-temperature service
Exotic Alloys
Specialized materials for extreme environments. Duplex, super-duplex, Inconel, Hastelloy, and titanium for maximum corrosion resistance and extreme service conditions.
Temperature Range:
Highly variable by alloy
Primary Use:
Extreme pressure, temperature, and corrosion
Material Selection Guide
Consider these factors when selecting the appropriate material for your application.
Temperature Service
Material properties degrade at elevated temperatures. Higher-alloyed materials maintain strength at temperature.
Examples:
Carbon <650°F, Alloy Steel to 1050°F+
Corrosion Environment
Some materials resist specific corrosive chemicals and media better than others. Stainless and exotics for aggressive service.
Examples:
Stainless for mild corrosion, Duplex/Hastelloy for severe
Pressure Requirements
Higher pressures benefit from stronger materials, though most materials can handle standard industrial pressures.
Examples:
Carbon adequate for most, exotics for extreme pressure
Cost Constraints
Material cost varies significantly. Carbon steel is most economical; exotic alloys are premium pricing.
Examples:
Carbon <Stainless <Alloy <Exotics
Code Requirements
Applicable piping codes often specify or restrict material grades. ASME section VIII, ASME B31.3, etc.
Examples:
ASME approved materials list per code section
Impact Resistance
Cryogenic and low-temperature service requires materials with good toughness. Low-temp grades tested per ASME.
Examples:
ASTM A350 LF2 for cryogenic service
Material Properties Comparison
| Material | Strength | Corrosion Resistance | Cost | Best For |
|---|---|---|---|---|
| Carbon Steel | Good | Fair (requires coating) | Low | General industrial |
| Stainless | Very Good | Excellent | Moderate | Corrosive environments |
| Alloy Steel | Excellent (high temp) | Good | Moderate | Elevated temperature |
| Exotic Alloys | Outstanding | Superior | High | Extreme conditions |
ASTM Material Standards
ASTM International standards define material specifications for flange production.
Carbon Steel Standards
- ASTM A105: Carbon steel forgings for piping applications
- ASTM A350 LF2: Low-temperature carbon steel
- ASTM A516 Gr.70: Pressure vessel plates
- ASTM A694: High-strength carbon steel
Stainless Standards
- ASTM A182 F304: Austenitic stainless steel
- ASTM A182 F316: Molybdenum stainless steel
- ASTM A182 F304L: Extra-low carbon F304
- ASTM A182 F316L: Extra-low carbon F316
Alloy & Exotic Standards
- ASTM A182 F11/F22: Chrome-molybdenum alloys
- ASTM A182 F91: Advanced chrome-molybdenum
- ASTM A182 F51: Duplex stainless
- Custom alloys: Inconel, Hastelloy, Titanium
Temperature Service Ratings
Room Temperature Service
For applications at or near ambient temperature (-20°F to 100°F):
- ✓ Carbon Steel: Excellent choice, economical
- ✓ Stainless: Better corrosion resistance if needed
- ✓ All materials suitable for non-corrosive service
Elevated Temperature Service
For applications above 200°F up to 1050°F+:
- ✓ Alloy Steel (F11, F22, F91): Required above 600°F
- ✓ Material strength decreases with temperature
- ✓ ASME provides derating curves for all materials
Low Temperature Service
For cryogenic and low-temperature applications below -20°F:
- ✓ ASTM A350 LF2: Specifically designed for low-temp
- ✓ Impact testing required per ASME
- ✓ Carbon steel brittleness must be avoided
Corrosive Environments
For applications with corrosive media or atmospheres:
- ✓ Stainless Steel: General corrosion resistance
- ✓ Duplex/Super-Duplex: Severe corrosion environments
- ✓ Hastelloy/Inconel: Extreme chemical service
Detailed Material Specifications
Carbon Steel
Detailed specifications, applications, and properties for carbon steel flanges.
View Details →Stainless Steel
Comprehensive guide to stainless steel grades and corrosion resistance properties.
View Details →Alloy Steel
Chrome-molybdenum alloys and high-temperature service specifications.
View Details →Exotic Alloys
Specialty alloys for extreme pressure, temperature, and corrosion conditions.
View Details →Need Material Selection Guidance?
Our material engineers can help you select the optimal material for your application requirements and operating conditions.
Consult Our Engineers