High yield strength with good toughness. Excellent through-thickness properties. Clean steel with minimal inclusions. Controlled yield-to-tensile ratios. Proven performance in autofrettage conditions.
Stringent procedure qualification testing. Full mechanical property characterization. Fracture mechanics testing of welds. Residual stress measurement. Long-term creep testing for high-temperature service.
Redundant pressure containment designs. Leak-before-break considerations. Multiple pressure relief paths. Robust support systems for heavy walls. Fatigue analysis for cyclic service.
100% volumetric examination of welds. Automated ultrasonic testing with TOFD. Hydrostatic testing to 1.5-2x design pressure. Strain gauge monitoring during testing. Final dimensional verification.
More frequent inspection intervals. Advanced NDT techniques for crack detection. Strict control of repair procedures. Pressure testing after any modification. Comprehensive record-keeping.
