Detailed product specifications
Product & specification
| Parameter / condition | Value / requirement |
|---|---|
| Steel grade | AH32 |
| Product form | Hot-rolled plate / wide flat for hull structures |
| Technical basis | IACS UR W11 Rev.9 (May 2017), Tables 2, 3, 5 and 7 |
| Reference thickness scope | t ≤ 100 mm; t denotes nominal plate thickness |
| Contract specification | State the required class rule / product standard and edition in the enquiry |
| Ordered dimensions | Thickness × width × length (mm), plate count or tonnage; supply sizes agreed in the quotation |
Chemical composition — mass %
| Parameter / condition | Value / requirement |
|---|---|
| Analysis basis | Ladle analysis; all numeric composition limits below are mass % |
| Carbon C — maximum | 0.18 |
| Manganese Mn | 0.90–1.60; minimum may be 0.70 for t ≤ 12.5 mm |
| Silicon Si — maximum | 0.50 |
| Phosphorus P — maximum | 0.035 |
| Sulfur S — maximum | 0.035 |
| Acid-soluble aluminium Al — minimum | 0.015 when used as the sole grain refiner; combined additions follow Table 2 note 4 |
| Total aluminium alternative | 0.020 minimum if total Al is measured instead of acid-soluble Al; grain-refiner combination provisions apply |
| Niobium Nb | 0.02–0.05 when selected as a grain refiner; the minimum is not compulsory for combined refiners |
| Vanadium V | 0.05–0.10 when selected as a grain refiner; the minimum is not compulsory for combined refiners |
| Titanium Ti — maximum | 0.02 |
| Nb + V + Ti — maximum total | 0.12 |
| Copper Cu — maximum | 0.35 |
| Chromium Cr — maximum | 0.20 |
| Nickel Ni — maximum | 0.40 |
| Molybdenum Mo — maximum | 0.08 |
| Nitrogen N — maximum | No fixed limit in W11 Table 2; report / agree any additional limit |
| Grain refinement | Al, Nb, V or another suitable refiner, singly or combined; these minima do not require all refiners simultaneously |
| Approved chemistry variations | TMCP chemistry and plate above 50 mm may have variations approved by the classification society (W11 §4) |
Mechanical properties
| Parameter / condition | Value / requirement |
|---|---|
| Yield strength ReH — minimum | 315 MPa |
| 0.2% proof strength alternative | Rp0.2 may be used when ReH cannot be determined; same specified minimum |
| Tensile strength Rm | 440–570 MPa |
| Proportional elongation A5 — minimum | 22 % |
| A5 gauge length | L0 = 5.65 × √S0, where S0 is the original specimen cross-sectional area |
| Tensile specimen orientation | For plate / wide flat ≥ 600 mm wide: normally transverse to rolling; other forms follow W11 §12–13 |
| Unit relation | 1 MPa = 1 N/mm² |
Elongation — 200 mm gauge
| Parameter / condition | Value / requirement |
|---|---|
| Specimen basis | Alternative full-thickness flat specimen, width 25 mm, L0 = 200 mm; these are A200 values, not A5 |
| t ≤ 5 mm — minimum | 14 % |
| 5 < t ≤ 10 mm — minimum | 16 % |
| 10 < t ≤ 15 mm — minimum | 17 % |
| 15 < t ≤ 20 mm — minimum | 18 % |
| 20 < t ≤ 25 mm — minimum | 19 % |
| 25 < t ≤ 30 mm — minimum | 20 % |
| 30 < t ≤ 40 mm — minimum | 21 % |
| 40 < t ≤ 50 mm — minimum | 22 % |
Charpy impact properties
| Parameter / condition | Value / requirement |
|---|---|
| Test method | Charpy V-notch (CVN) |
| Test temperature | 0 °C |
| Full-size specimen section | 10 × 10 mm; the energy limits below refer to full-size specimens |
| Minimum average requirement | Arithmetic average of a set of 3 specimens |
| t ≤ 50 mm — Longitudinal average | 31 J minimum |
| t ≤ 50 mm — Transverse average | 22 J minimum |
| 50 < t ≤ 70 mm — Longitudinal average | 38 J minimum |
| 50 < t ≤ 70 mm — Transverse average | 26 J minimum |
| 70 < t ≤ 100 mm — Longitudinal average | 46 J minimum |
| 70 < t ≤ 100 mm — Transverse average | 31 J minimum |
| Individual specimen rule | At most one result below the required average; no result below 70% of that average |
| Orientation selection | Normally longitudinal tests; transverse testing where required by purchaser / class, with transverse properties guaranteed |
| Thin plate provision | Below 10 mm: class may waive the test or use W2 sub-size specimens; below 6 mm generally not required |
| Sampling depth | For plate > 40 mm: specimen longitudinal axis at quarter thickness; other placement rules in W11 §13.2 |
| Acceptance test frequency | Relaxation only by special class agreement with satisfactory occasional check tests |
Carbon equivalent & weldability
| Parameter / condition | Value / requirement |
|---|---|
| Ceq calculation — mass % | C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15, using ladle analysis |
| TMCP Ceq — t ≤ 50 mm | 0.36 % maximum |
| TMCP Ceq — 50 < t ≤ 100 mm | 0.38 % maximum |
| Ceq limit applicability | W11 Table 3: TM / TMCP route only; do not apply these maxima automatically to N / CR / QT material |
| Pcm alternative — mass % | C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B |
| Pcm acceptance | Alternative at class discretion; the classification society sets the required limit |
Delivery condition
| Parameter / condition | Value / requirement |
|---|---|
| Process abbreviations | AR: as rolled; N: normalized; CR / NR: controlled / normalizing rolled; TM: thermomechanically rolled; QT: quenched and tempered |
| Deoxidation practice | Killed and fine-grain treated |
| Nb / V refined — t ≤ 12.5 mm | Any condition permitted by Table 5 / class approval |
| Nb / V refined — 12.5 < t ≤ 100 mm | N / CR / TM |
| Al or Al + Ti refined — t ≤ 20 mm | Any condition permitted by Table 5 / class approval |
| Al or Al + Ti refined — 20 < t ≤ 35 mm | Any; AR needs special class approval |
| Al or Al + Ti refined — 35 < t ≤ 100 mm | N / CR / TM |
Dimensions & tolerances
| Parameter / condition | Value / requirement |
|---|---|
| Thickness tolerance basis | IACS UR W13 Rev.7 (September 2021), for W11 hull plate / wide flat |
| Main W13 dimensional scope | Width ≥ 600 mm and thickness ≥ 5 mm; thinner product follows W13 §1.1 / agreed standard |
| Local nominal-thickness minus tolerance | −0.3 mm within the main W13 scope, except approved alternatives / repair provisions |
| Measured average thickness | Not less than nominal thickness; this is a separate check from the local minus tolerance |
| Positive thickness tolerance | Agreed recognized dimensional standard and ordered class |
| Width / length / flatness | Specify the dimensional standard, class and ordered dimensions in the quotation |
| Thickness measurement plan | At least 2 measuring lines, at least 3 points on each; follow W13 Annex locations |
Inspection & documentation
| Parameter / condition | Value / requirement |
|---|---|
| Chemical analysis record | Heat / ladle analysis including intentional alloy additions |
| Mechanical test record | Yield or proof strength, tensile strength, elongation and applicable CVN results with test temperature / direction |
| Surface condition | Recognized surface standard such as EN 10163 or class-accepted equivalent, with any enhanced order requirements |
| Ultrasonic examination | If ordered: name the accepted inspection standard and acceptance class (W11 §8) |
| Through-thickness properties | If ordered for t ≥ 15 mm: state required Z quality and W14 acceptance (W11 §11.3) |
| Traceability | Connect heat / cast number and piece identity to the supplied plates |
| Class inspection document | Identify the requested society and actual order inspection / certificate scope |
The stated values use the rule edition shown above. Select the contract standard, thickness, delivery condition and test specimen together; the supplied plate certificate records the actual heat results.
About AH32 plate
High-strength ship plate in the 32 family, with the A impact category.
Shipbuilding plate supply
Enquire about AH32 plate for hull, deck and structural applications specified in your project. Include the required standard and class society with the material schedule.
Sizes and delivery condition
Send thickness × width × length and the plate count or tonnage. We will discuss the rolling or heat-treatment condition, inspection requirements and supply arrangements for the order.
Processing and shipment
Need cut-to-size plates, drilling or surface treatment? Include your drawing references and processing requirements. Let us know the destination port and required delivery schedule.
Documentation
State the required mill test certificate, class inspection and supplementary testing in the enquiry. The quotation will confirm the agreed scope.
Specification notes
The table above gives published technical reference values under its stated conditions. The contract standard, approved material schedule and certificate for the supplied plate govern acceptance.
Order parameters
- Thickness / size scope
- Confirm grade/thickness/mill approval combination
- Delivery condition
- Subject to grade, thickness and approved mill route
- Class society requested
- ABS, CCS, DNV, LR, BV, RINA
Society names are enquiry options. Approval and certificate scope must be confirmed for the actual material.
Frequently asked questions
What is required to order AH32 plate?
Specify grade, product standard and edition, class society, thickness × width × length, quantity, delivery condition and supplementary testing.
Is AH32 automatically approved by every class society?
No. Approval scope and the actual plate certificate must match the named project society and ordered product.
Technical sources and specification notes
- 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. - IACS UR W11 Rev.10 (September 2025) — Scope and implementation note
Implementation note refers to 1 January 2027 triggers. Do not automatically apply to an October 2026 order. - 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. - 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 W13 Rev.7 (September 2021) — Sections 1, 3–5 and Annex; checked 2026-10-31
Thickness minus tolerance and average thickness are independent criteria; agreed alternatives and repair provisions may apply.