Material Properties & Compatibility
Room-temperature strength, physical/thermal properties and first-pass chemical compatibility for common alloys used in petrochemical and marine service.
CS A106
Mechanical Properties
Yield
240MPa
Tensile
415MPa
Elongation
30%
Hardness
143HB
Modulus
200GPa
Density
7,850kg/m³
Physical & Thermal
Poisson
0.30
CTE
12.010⁻⁶/K
Th. cond.
54W/m·K
Sp. heat
486J/kg·K
Max service
425°C
PREN
—
Chemical Resistance
Wet H₂S / sour
ISO 15156 / NACE MR0175 limits apply
Seawater / chlorides
Ambient, flowing and oxygenated
Fresh water / condensate
Near-neutral, low chloride
Hydrochloric acid
Dilute, ambient screening
Sulfuric acid
Dilute, ambient screening
Nitric acid
Dilute, ambient screening
Phosphoric acid
Dilute, ambient screening
Hydrofluoric acid
Screening only — highly hazardous
Acetic acid
Organic acid, ambient screening
Caustic soda (NaOH)
Dilute, ambient screening
Ammonia / amines
Watch alkaline & amine SCC
Wet chlorine / hypochlorite
Strong oxidizing halogen
Service noteEconomical, but corrosion allowance or lining is commonly required. Sour service depends on hardness, heat treatment and ISO 15156 limits.
Sour service: ISO 15156 / NACE MR0175
A material family cannot be marked simply “NACE compliant.” Qualification depends on the exact grade and condition, hardness, H₂S partial pressure, pH, chloride level, temperature and elemental sulfur. Use the limits for the applicable material group in the edition adopted by the project.