What material-environment couples are most susceptible to SCC?

High-strength steel in H2S (sour service, NACE MR0175). Austenitic stainless steel in hot chlorides. Aluminium alloys in NaCl. Copper alloys in ammonia. Titanium in methanol. SCC requires simultaneous presence of tensile stress, susceptible material, and specific environment.

How is KISCC measured?

KISCC is typically measured by pre-cracked specimens exposed to the environment at defined K levels. At K < KISCC no crack growth occurs; above KISCC, da/dt follows a threshold-plateau-fast fracture pattern. KISCC for high-strength steel in H2S may be only 20–30% of KIC in air.

Stress Corrosion Cracking Threshold (KISCC) Calculator

Calculate stress intensity at a crack tip K = Yσ√(πa) and compare with KISCC (environment-specific threshold). Assess susceptibility to SCC for material-environment combinations.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the scenario you are assessing. Calculate stress intensity at a crack tip K = Yσ√(πa) and compare with KISCC (environment-specific threshold). Assess susceptibility to SCC for material-environment combinations. Use the kiscc threshold result to inform your calculation.

Stress Corrosion Cracking Threshold (KISCC) Calculator

How to Use

Frequently Asked Questions

What material-environment couples are most susceptible to SCC?

How is KISCC measured?