Chemical Processing Solutions
Specialty alloys for aggressive chemical environments.
Overview
Chemical processing plants expose flanges to sulfuric acid, caustic, chlorine gas, hydrogen peroxide, and dozens of other aggressive chemicals. Corrosion rates, stress corrosion cracking, and erosion dominate design considerations. Material selection is critical; using the wrong alloy can result in catastrophic failure within weeks.
Applications
Sulfuric acid concentration and handling
Caustic (NaOH) circulation systems
Chlor-alkali plant piping
Organic acid and polyol processing
Hydrogen peroxide decomposition
Fertilizer and nitric acid plants
Phenolic and adhesive reactor connections
Relevant Standards
- •ASME B16.5 (base standard)
- •ASTM G31 (corrosion testing)
- •ISO 3506 (fastener materials)
- •ASTM G35 (stress corrosion testing in polythionic acid)
Material Grades
ASTM A182 F304L
austenitic base
ASTM A182 F316L
molybdenum-enhanced
Duplex 2205
dual-phase corrosion resistance
Super-duplex 2507
extreme chloride
Hastelloy C-276
HCl and mixed acid service
Common Pressure Classes
Class
150
Class
300
Class
600
Class
900
Typical Service Specifications
Chemical plants operate across 150-900 PSI at 32-400°F. Material selection depends on specific chemistry; corrosion data sheets from suppliers like NACE and material producers guide selection. Flanges often require passivation (ASTM A967) and electropolish for contamination control.
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