How shipbuilding steel plate is manufactured and released

From heat to plate

Steel chemistry and deoxidation are controlled at the heat stage. Slab identity must remain traceable through reheating, rolling and any specified heat treatment. Controlled rolling and cooling schedules are part of the approved manufacturing route.

Production controls

Record heat analysis, rolling and heat-treatment batches, plate dimensions and test-unit grouping. Plan sample locations and destructive tests before cutting or subdividing the parent plate. A cut piece should retain a documented link to its parent certificate.

Release package

The delivery package should connect the order, plate list, test results, dimensional inspection and class documents. Nonconforming material needs identified segregation and an approved disposition. Mill capability statements do not substitute for the actual heat and plate records.

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

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  GB 712—2011 chemistry is historical reference, not a current contract standard.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.