What the category means
The A/D/E/F higher-strength categories are associated with 0/−20/−40/−60°C test temperatures in the referenced W11 tables. Energy requirements can change with strength level, thickness and longitudinal or transverse specimens. Some thin products or approved production routes have special provisions.
Review the actual certificate
Check the full-size or sub-size specimen declaration and the sampling location. Identify individual readings, the average and the applicable re-test conditions. Confirm that the certificate results correspond to the delivered plate and final supply condition.
Use in design
Charpy testing is a comparative notch-toughness acceptance test. It is not a direct fracture-toughness value, a fatigue-life prediction or an operating-temperature guarantee. Critical low-temperature designs may need additional fracture assessment and project-specific testing.
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 I specify −40°C for any hull location?
The design temperature, stress state, thickness, structural category and class rules govern selection. Obtain the designer’s approved requirement.
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. - IACS UR W11 Rev.9 (May 2017) — Sections 1–8; chemistry tables 1–2 and mechanical tables 6–7
Reference values are conditioned on grade, thickness, specimen and project rule. Not ASTM A131 acceptance data. - 中外钢铁牌号速查手册（第4版） — PDF pp. 275–277; printed pp. 264–266, tables 5-4/5-5
GB 712—2011 chemistry is historical reference, not a current contract standard. Table footnotes inspected.