Fatigue assessment
Load cycles, stress concentration, weld geometry, residual stress and corrosion influence fatigue damage. Increasing base-metal yield strength does not automatically raise the fatigue category of a welded detail. Use the approved structural assessment method for the vessel or offshore structure.
Fracture control
Thickness, temperature, stress state, defects and toughness interact. Charpy acceptance is useful material evidence, but it is not a direct prediction of crack growth or critical flaw size. Fracture-mechanics assessment may be required for critical or damaged details.
Through-life evidence
Link inspection intervals and repair criteria to the damage mechanism. Retain weld inspection, thickness surveys and loading history where available. Do not publish a fixed number of years as the service life of all ship plates.
Information to record
- Exact product standard and edition; approved drawing or specification revision.
- Grade, dimensions, final condition and heat-to-piece traceability.
- Acceptance test, inspection document and responsible approving party.
Frequently asked questions
Can a hardness result prove fatigue life?
No. Hardness alone does not characterize the welded detail, crack population or cyclic loading history.
Sources and reference scope
- Procurement and editorial guidance — Cross-checked against product terminology and the cited material rules
Guidance describes checks to request. It is not a claim of available stock, certificates or completed project engineering. - 钢材产品简介 — Slides 3, 5–6, 15–19
Product forms, units and grade vocabulary; not proof of current stock or class certification.