AH36 is the 355 MPa minimum-yield member of the higher-strength hull steel family.
Global Steel Supply & Processing
IACS UR W11 · AH36 / A36 · Higher-strength hull plate · Mill & class verification
Submit your AH36 plate thicknesses, cut dimensions, total tonnage and nominated classification society. Get a factory-supply quotation that addresses strength, impact testing and project delivery.
*34 J longitudinal minimum average impact energy at 0°C for plate up to 50 mm; test conditions and approval follow the relevant classification rules.
Specify the 36 strength class, plate dimensions, producing mill approval and Charpy document requirements alongside the order quantity.
| Steel grade | AH36 (A36 / HA36 in applicable class designations) |
| Grade family | Higher-strength hull structural steel, 36 strength class |
| Technical basis | IACS UR W11 Rev.9 and the specified classification society rules |
| Minimum yield strength | 355 MPa |
| Tensile strength | 490–630 MPa |
| Elongation | 21% min. for the standard proportional gauge (test provisions apply) |
| Impact temperature | 0°C for Grade AH36 (A36) |
| Reference plate thickness | IACS UR W11 grade provisions primarily apply to plates through 100 mm; actual mill approval governs supply |
| Plate size | Thickness × width × length, confirmed against your RFQ |
| Delivery condition | Class-approved AR / N / NR / TMCP route according to thickness and approved grain-refining process |
| Material documents | Verified heat number, tensile and Charpy test results, required class material certificates |
| Quoted supply | Grade AH36, approving class, size list, plate quantity / MT, required delivery and port |
Values are IACS reference requirements. The actual mill approval, thickness range, specimen requirements and classification survey procedures govern acceptance.
Confirm the 0°C Charpy requirement for each thickness and specimen orientation in your approved hull material schedule.
| Nominal thickness | Impact temperature | Longitudinal min. avg. | Transverse min. avg. |
|---|---|---|---|
| t ≤ 50 mm | 0°C | 34 J | 24 J |
| 50 < t ≤ 70 mm | 0°C | 41 J | 27 J |
| 70 < t ≤ 100 mm | 0°C | 50 J | 34 J |
AH36 is the 355 MPa minimum-yield member of the higher-strength hull steel family.
Verify 0°C impact toughness, plate thickness, test orientation and the required class certificate.
Confirm producing mill approval, applicable thickness range and ordered plate inspection records.
Review the killed, fine-grain-treated steel composition and request actual heat analysis and weldability data for the material supplied.
| Element | IACS Reference Requirement |
|---|---|
| Carbon (C) | ≤ 0.18% |
| Manganese (Mn) | 0.90–1.60%* |
| Silicon (Si) | ≤ 0.50% |
| Phosphorus (P) | ≤ 0.035% |
| Sulfur (S) | ≤ 0.035% |
| Acid-soluble aluminium (Al) | ≥ 0.015% where the Al route applies |
| Copper (Cu) | ≤ 0.35% |
| Chromium (Cr) | ≤ 0.20% |
| Nickel (Ni) | ≤ 0.40% |
| Molybdenum (Mo) | ≤ 0.08% |
The selected steelmaking practice may use aluminium, niobium, vanadium, titanium or an approved combination of grain-refining elements.
*For thickness up to 12.5 mm, the manganese minimum may be reduced to 0.70% under the IACS conditions. Fine-grain elements and chemistry variations follow the applicable class-approved manufacture and delivery route.
When your shipyard specifies high-heat-input welding or through-thickness testing, include the applicable requirements with your order so the approved mill and plate condition can be verified.
Review the AH36 grade callouts on hull construction drawings, including load-carrying components and the approved impact-test scope.
Source class‑approved AH36 hull plates for welded shell strakes, block construction and structural reinforcements.
Include deck components, welded webs and associated plate details from your shipyard steel schedule.
AH36 grade plate used in selected hull zones according to the vessel structural specification.
Deck and supporting structural parts cut to the required drawings and dimensions.
Plate brackets, connection panels and internal hull reinforcement details.
Welded longitudinal and transverse webs forming part of the approved hull design.
Replacement hull sections matched to the approved grade and class documentation.
Grade-traceable plate lots for scheduled newbuilding or repair procurement.
Send the class, thickness schedule, tonnage and required delivery port in one RFQ.
Confirm the producing works is approved for AH36, the ordered thickness and rolling condition. Classification survey and material documentation should match the project specification.
Verify approval of the actual producing steelworks for Grade AH36, including thickness range and delivery condition.
Request 355 MPa yield results, 490–630 MPa tensile acceptance, and the appropriate 0°C Charpy test records.
Confirm the issued class certificate, heat number, plate identification and inspection records with the shipment.
Specify the plate surface, thickness and edge tolerances that your AH36 shipyard cutting and welding procedures require.
Nominal thickness, cut dimensions and inspection tolerances guide the acceptance plan.
For AH36 the approved route depends on plate thickness, grain-refining elements and the producing works approval.
Thin-plate routes follow IACS Table 5; above certain thresholds, as-rolled supply requires class permission and satisfactory impact testing.
For thicker grade A36 plates the approved mill may supply normalized or normalizing-rolled material under the class rules.
Order the approved TMCP process where specified, with the associated heat analysis and carbon-equivalent requirements.
Provide any high-heat-input welding, Z-direction or supplementary impact requirements early for mill approval review.
Our value is in steel-scale purchasing, verifying your class-required documents and coordinating delivery for your vessel schedule.
Our company-wide annual output of 8 million MT supports steel sourcing programs. The approved producing works for AH36 is confirmed per order.
Regular inventory across steel products reaches 1 million MT; ask for a thickness-specific AH36 availability check.
Match the producing mill approval, 355 MPa strength class, impact testing and inspection documentation to your purchase order.
Coordinate AH36 plate dimensions, packing units, customs-related documents and receiving port through a single quotation.
BAOSTEEL METAL operates at 8 million metric tons of actual annual steel production across all product lines, supported by 500,000 m² factory premises and more than 1,000 employees. The steelworks approval for the specific AH36 plate, thickness and processing route is checked with your enquiry.
Send your AH36 plate schedule and nominated society to check current stock or approved production possibilities. Company-wide regular inventory is approximately 1 million metric tons across steel categories.
Order acceptance depends on the actual producing steelworks and the classification rules for AH36. Include the appropriate survey, impact and MTC records in the enquiry.
Use the nominal hull plate thickness, width and length to estimate your AH36 order tonnage before confirming packaging and delivery terms.
Nominal plate density: 7,850 kg/m³. Commercial tonnage follows the agreed measurement and contract.
Include the specifications that control price, approval and delivery.
Share your shipyard plate schedule and approved project documents for review.
Send shipyard cutting drawings and edge requirements together with the ordered plate dimensions. Available processes are confirmed by thickness and class acceptance scope.
Profile cutting assessed by plate thickness and cutting drawing.
Available processing routes reviewed for marine plate blanks.
Finished parts and hole requirements quoted as specified.
Confirm plate bundle sizes, markings, required survey records, loading equipment and receiving port. Shipment terms follow your agreed supply contract.
Compare 315 MPa and 355 MPa strength classes alongside 0°C, −20°C, −40°C and −60°C Charpy grades for the specified vessel construction.
Each grade follows separate strength, impact, chemistry and delivery requirements. Select the material designated by your vessel specification.
355 MPa minimum yield and 0°C impact grade for hull construction.
315 MPa minimum yield and the same 0°C AH impact temperature.
View grade →355 MPa minimum yield with a −20°C reference Charpy temperature.
View grade →IACS UR W11 specifies 355 MPa minimum yield, 490–630 MPa tensile strength and 21% minimum proportional elongation for grade A36/AH36. The actual test acceptance follows the approved plate specification.
AH36 uses a 0°C reference temperature. For full-size specimens, the minimum average longitudinal impact energy is 34 J up to 50 mm, 41 J over 50 to 70 mm and 50 J over 70 to 100 mm.
Provide the classification society, vessel or project requirements, plate dimensions and delivery condition. We will check the proposed mill approval scope and the required material survey documentation for your order.
Send your grade, thickness list, widths, lengths, quantity, delivery schedule, class society, inspection requirements and destination port.
Include cutting drawings, finished dimensions, hole details and required tolerances. Processing feasibility and the applicable acceptance route are confirmed with your quotation.
IACS AH36, also designated A36 by class rules, is a higher-strength ship hull material. ASTM A36 is a separate carbon structural steel specification. State AH36 and the nominated classification society for marine plate orders.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.