AH36 High Strength Hull Shipbuilding Steel Plate for Marine & Offshore Projects

  IACS Certified 355 MPa Yield Strength Steel with 0°C Impact Toughness  

Overview

The designation AH36 originates from the International Association of Classification Societies (IACS) system. It is not merely a Chinese steel grade, but a universal specification implemented by classification societies and steel mills worldwide. It is an internationally recognized material specification that ensures global consistency in material performance, certification, and acceptance standards for shipbuilding and offshore engineering.

This steel grade is specifically designed for ship hull structures requiring excellent strength performance in standard temperature conditions. Its core performance is characterized by a minimum yield strength of 355 MPa and reliable impact toughness at 0°C, making it an ideal choice for constructing vessels navigating temperate and tropical waters.

Definition and Naming Logic

The designation AH36 originates from the International Association of Classification Societies (IACS) Unified Requirements.

Its logical structure is: 1 letter + 1 letter + 2 digits

First letter (A): Quality grade symbol, representing its impact toughness test temperature at 0°C.
Second letter (H): Strength grade symbol, denoting it as High Strength steel.
Digits (36): Minimum yield strength identifier, in units of 36kgf/mm² (355 MPa).

Code Interpretation

Therefore, when treating AH36 as a code, the correct and complete deciphering is:

"A high-strength shipbuilding structural steel requiring impact testing at 0°C, with a minimum yield strength of 355 MPa."

Value Proposition

Just like the karat standard for gold, the AH36 specification provides the simplest and most reliable common benchmark for complex international procurement. As professional Chinese suppliers, we create our core value by delivering this globally-endorsed quality with optimal cost efficiency and reliable service.

We are a Chinese supplier offering AH36 in spot supply and mill-direct ordering services, with full export service capabilities.

We have served global shipyards and are familiar with classification society inspection processes.

Start Your AH36 Procurement

We provide two procurement options for AH36 steel plates, so you can choose the most cost-effective solution for your project. Backed by competitive prices, strict quality control, and on-time delivery, we make sourcing simple and reliable.

✓ Immediate availability & pricing

✓ Formal quotation in 8 hours

Supply-Available AH36 Ship Plates and Approved Classification Societies 

AH36 steel plates are certified and approved by all major international classification societies, ensuring global acceptance for marine construction projects. The following ranking is in alphabetical order of the classification society abbreviations.

ABS

American Bureau of Shipping

United States

✓ Available
Certified
BV

Bureau Veritas

France

✓ Available
Certified
CCS

China Classification Society

China

✓ Available
Certified
CRS

Croatian Register of Shipping

Croatia

Certified
DNV

Det Norske Veritas  (DNV & GL)

Norway

✓ Available
Certified
IRS

Indian Register of Shipping

India

Certified
KR

Korean Register of Shipping

South Korea

✓ Available
Certified
LR

Lloyd's Register

United Kingdom

✓ Available
Certified
NK

ClassNK

Japan

✓ Available
Certified
PRS

Polish Register of Shipping

Poland

Certified
RINA

Registro Italiano Navale

Italy

✓ Available
Certified
RS

Russian Maritime Register of Shipping

Russia

✓ Available
Certified

Note: In practical applications and certification documents, AH36 is typically prefixed with the specific classification society abbreviation to indicate compliance with that society's specific rules and approval requirements. For example, CCS AH36 (China Classification Society), ABS AH36 (American Bureau of Shipping), BV AH36 (Bureau Veritas), and DNV AH36 (Det Norske Veritas). The exception is the Russian Maritime Register of Shipping (RS), where the steel grade is designated as PC AH36.

Key Advantages of AH36 Steel Grade

Steel Grade
Balanced Strength Performance
Standard Temperature Toughness
Marine Durability
Excellent Fabrication Properties
AH36 Marine Steel 355 MPa minimum yield strength provides optimal balance of strength and toughness for demanding marine applications Maintains stable impact toughness at 0°C for reliable standard temperature performance Specifically designed for medium-high strength vessels operating in temperate and tropical marine environments Superior weldability and formability for efficient shipyard fabrication in various climates

Chemical Composition & Mechanical Properties of AH36 Steel

Chemical Composition (Typical, %)

C Si Mn P S Cu Cr Ni Nb V Ti Mo N Al
≤0.18 ≤0.50 0.90 – 1.60 ≤0.035 ≤0.035 ≤0.35 ≤0.20 ≤0.40 0.02 – 0.05 0.05 – 0.10 ≤0.02 ≤0.08 - ≥0.015

i Chemical Element Explanations

C (Carbon): ≤0.18% - Influences strength and hardness.
Si (Silicon): ≤0.50% - Increases strength, deoxidizer.
Mn (Manganese): 0.90-1.60% - Enhances strength and toughness, desulfurizer.
P (Phosphorus): ≤0.035% - Harmful element, reduces toughness.
S (Sulfur): ≤0.035% - Harmful element, causes hot shortness.
Cu (Copper): ≤0.35% - Improves corrosion resistance.
Cr (Chromium): ≤0.20% - Improves corrosion resistance and hardness.
Ni (Nickel): ≤0.40% - Enhances toughness and low-temperature properties.
Nb (Niobium): 0.02-0.05% - Refines grain structure, improves strength.
V (Vanadium): 0.05-0.10% - Refines grain structure, improves toughness.
Ti (Titanium): ≤0.02% - Refines grain, fixes carbon and nitrogen.
Mo (Molybdenum): ≤0.08% - Improves high-temperature strength and corrosion resistance.
N (Nitrogen): - (Controlled by production process)
Al (Aluminum): ≥0.015% - Deoxidizer, refines grain structure.

* Typical values according to classification society specifications. Actual limits may vary by approval.

Mechanical Properties of AH36 Steel

Thickness (mm) Yield Strength (MPa) Tensile Strength (MPa) Elongation (%) Impact Test Temperature Longitudinal Impact (KV2)/J Transverse Impact (KV2)/J
≤50 mm ≥355 MPa 490 – 630 MPa ≥21% 0°C 34 24
>50~70 mm ≥355 MPa 490 – 630 MPa ≥21% 0°C 41 27
>70~150 mm ≥355 MPa 490 – 630 MPa ≥21% 0°C 50 34

A-Grade Hull Steel: Strength Grade Comparison for Marine Applications

The following table compares different strength grades within the A-Grade hull steel series (all grades impact tested at 0°C), illustrating available options for increasing load-bearing capacity while maintaining the same 0°C impact toughness.

Comparison of A-Grade Marine Steel Plates for Shipbuilding Applications
Steel Grade Impact Test Temperature Yield Strength (Minimum) Typical Application Environment
AH36 0°C ≥ 355 MPa Primary structures for vessels in temperate and tropical waters; most cost-effective high-strength option.
AH32 0°C ≥ 315 MPa Coastal/offshore vessel exposed structures; non-exposed primary structures of ocean-going ships.
AH40 0°C ≥ 390 MPa Key high-stress areas on large vessels in temperate waters (e.g., hatch corners).

36-Class Hull Steel: Quality Grade Comparison for Different Temperature Requirements

This table compares different quality grades within the 36 Class high-strength hull steel series. All grades share the same minimum yield strength (≥355 MPa) but are designed for different service temperatures and marine environments.

Comparison of 36-Class Steel Quality Grades for Different Marine Service Temperatures
Quality Grade Steel Grade Yield Strength (Minimum) Impact Test Temperature Key Selection Insight
 Standard Temperature AH36 ≥ 355 MPa 0°C Most cost-effective high-strength steel for temperate and tropical waters. Optimal balance of strength and cost.
Low-Temperature DH36 ≥ 355 MPa -20°C Basic low-temperature toughness for cold climate service.
Enhanced Low-Temperature EH36 ≥ 355 MPa -40°C Primary steel for global ocean-going vessels. Optimal combination of strength and toughness.

Choose Your Optimal Marine Steel Grade

Compare key specifications across similar grades. Varying parameters are highlighted for quick decision-making.

AH36

CURRENT
Impact Test
0°C ≥34J
Tensile Strength 490-630 MPa
Yield Strength (Min) ≥355 MPa
Key Feature Standard

DH36

Low-Temperature
Impact Test
-20°C ≥34J
Tensile Strength 490-630 MPa
Yield Strength (Min) ≥355 MPa
Key Feature Balanced Performance

EH36

LOW TEMP
Impact Test
-40°C ≥34J
Tensile Strength 490-630 MPa
Yield Strength (Min) ≥355 MPa
Key Feature Arctic Service

FH36

SUPER LOW
Impact Test
-60°C ≥34J
Tensile Strength 490-630 MPa
Yield Strength (Min) ≥355 MPa
Key Feature Extreme Cold

DH32

STANDARD
Impact Test
-20°C ≥31J
Tensile Strength 450-570 MPa
Yield Strength (Min) ≥315 MPa
Key Feature Standard Strength

DH40

HIGH STRENGTH
Impact Test
-20°C ≥41J
Tensile Strength 510-660 MPa
Yield Strength (Min) ≥390 MPa
Key Feature High Strength

Typical Applications of AH36 Marine Steel Plate

Medium-high Strength Hull Structures
AH36 steel plates are the primary choice for constructing the main hull structures of vessels operating in standard temperature waters. Their 355 MPa minimum yield strength ensures structural integrity under heavy loads, providing a reliable and cost-effective solution for high-strength applications.
Decks & Bulkheads
For marine decks and bulkheads, AH36 provides an optimal balance of strength and standard toughness. This makes it ideal for critical areas in vessels operating in temperate and tropical waters, offering excellent weldability and reliable impact resistance at 0°C.
Marine Structural Components
A wide range of marine structural components are fabricated from AH36 due to its guaranteed 355 MPa yield strength and 0°C impact toughness. This combination is essential for parts subjected to dynamic stresses in standard marine conditions, ensuring long-term durability and safety for vessels in warmer climates.
Vessels in Temperate & Tropical Climates
The optimal strength and standard toughness of AH36 marine steel make it the standard choice for the safety of vessels sailing in temperate and tropical climate zones. It provides reliable performance for year-round operations in these common marine environments.
Offshore Structures (Standard Climate)
Offshore oil and gas platforms in non-arctic regions utilize AH36 steel for key structural sections. Its high strength and reliable 0°C toughness ensure stability and integrity under the combined loads of wind and waves, which is paramount for the safety of these infrastructures in standard climatic conditions.

Available Sizes & Supply Conditions for AH36 Steel Plate

Dimensions

Thickness: 6 – 150 mm

Width: Up to 5,300 mm

Length: Up to 18,000 mm

Supply Conditions

Delivery Condition: Normalized (N) / Thermo-Mechanical Control Processed (TMCP) / Hot rolled / Controlled rolling
Standards: ASTM A131, EN 10025-3, JIS G3106, GB/T 712

Quality Control & Certification for AH36 Marine Steel

Inspection & Quality Control

• Chemical composition analysis and verification
• Tensile and elongation testing for mechanical properties
• Charpy V-notch impact testing at 0°C for toughness verification
• Ultrasonic testing (UT) for internal quality assessment
• Third-party inspection available (SGS, Bureau Veritas, TÜV, DNV, etc.)

Certification & Documentation

Each shipment includes comprehensive documentation:

✓ EN 10204 3.1 mill test certificate with full test results
✓ Classification society approval certificate (ABS, LR, BV, DNV, etc.)
✓ Heat number traceability for full material history
✓ Optional EN 10204 3.2 certificate available upon request

Why Choose CEHE Steel for Your Marine Steel Needs?

Discover how our expertise, resources, and commitment make us the preferred partner for marine steel solutions worldwide.

Powerful Resource Network and End-to-End Supply Assurance

Through alliances with 7 top-tier Chinese steel mills, we turn your custom steel requirements into reality—backed by classification society-certified inventory that stands ready to resolve rush orders and critical stockouts at a moment's notice.

Resource & Dimensions
Thickness: 6-150mm, Width: up to 5300mm, Length: up to 18000mm
Strategic Inventory
We have reserved a certain amount of CCS, ABS, BV, RINA in stock for you to quickly solve the urgent needs of ship body repair 
Global Logistics
Professional packaging with real-time tracking worldwide.
Supply Chain Control
We provide custom steel plate service with the fastest delivery cycle of up to 15 days.

Comprehensive Quality System and Transparent Traceability

We implement a quality control and traceability system that exceeds standard requirements, ensuring every steel plate we supply is reliable, compliant, and fully documented.

Full Certification
Meets ABS, DNV, GL, LR, BV, CCS, NK, RINA, KR standards.
Stringent Inspection
Third-party inspection support (SGS, BV) with rigorous internal QC.
Complete Traceability
Unique heat number tracking from mill to project.
Quality Standards
EN 10204 3.1/3.2 certificates with every shipment.

Technical Expertise and Comprehensive Project Support

We position ourselves not just as material suppliers but as technical partners, offering complete service from material selection through to final delivery and beyond.

Expert Consultation
Free technical guidance on material selection, welding, fabrication.
Project Follow-up
Immediate response, risk assessment, contract review, production tracking.
Value-Added Services
Export documentation, logistics arrangement, inspection coordination.
Continuous Support
From order confirmation to post-installation.

Proven Experience and Global Trust Since 2009

Since our founding in 2009, we have built deep expertise in marine steel applications and validated our capabilities through successful projects worldwide.

Industry Experience
Focused exclusively on marine steel since 2009
Global Performance
Successfully supplied major shipbuilding and offshore projects worldwide.
Trusted Partner
Long-term relationships with marine plate distributors and manufacturers.
Project Validation
Validated capabilities through successful global projects.

Frequently Asked Questions

AH36 is primarily used for medium-high strength hull structures, decks, bulkheads, and marine components of vessels operating in standard temperature waters. It is ideal for applications requiring reliable performance with 355 MPa yield strength and 0°C impact toughness in temperate and tropical climate regions.

The main difference is yield strength. Both AH32 and AH36 are impact tested at 0°C, but AH32 has a minimum yield strength of 315 MPa, while AH36 has a higher minimum yield strength of 355 MPa. AH36 provides better load-bearing capacity for applications requiring more strength while maintaining the same standard temperature toughness.

AH36 is impact tested at 0°C (32°F) in accordance with classification society requirements for standard marine service conditions, same as AH32 but with medium-high strength.

We provide EN 10204 3.1 mill test certificates along with classification society approval certificates for each shipment, including specific documentation for 0°C impact testing and 355 MPa yield strength verification.

Yes, we can supply AH36 plates with certifications from major classification societies including ABS (American Bureau of Shipping), BV (Bureau Veritas), DNV (Det Norske Veritas), LR (Lloyd's Register), CCS (China Classification Society), NK (Nippon Kaiji Kyokai), KR (Korean Register), and RINA. We can work with your designated classification society to meet specific project requirements for medium-high strength applications.

Yes, we can arrange third-party inspections from organizations like SGS, Bureau Veritas, TUV, or Lloyd's Register upon customer request, including verification of 0°C impact test results and 355 MPa yield strength testing.

Yes, we specialize in customized solutions. We can supply AH36 plates according to your specified dimensions, thicknesses, and classification society requirements for medium-high strength applications. We also provide EN 10204 3.2 certificates upon request.

Delivery time for customized orders: Approximately 20 days for hot-rolled plates and 35-55 days for normalized plates, depending on specifications.

We offer flexible MOQ options. For hot-rolled plates, typical lead time is around 20 days. For normalized plates, expect 35-55 days depending on specifications and quantity. We do not have a mandatory requirement for the minimum order quantity of medium-high strength shipbuilding steel plates between 10-50mm, and we can basically provide them according to the quantity you need.

The price of AH36 steel plate fluctuates based on raw material costs, thickness, dimensions, purchase volume, and market conditions. AH36 typically commands a moderate premium over AH32 due to its higher strength specifications. For the most accurate and competitive real-time quotation, please contact our sales team with your specific requirements (grade, size, quantity, destination port, and any special certifications needed). We provide competitive pricing and respond within 24 hours.

For marine steel plates (including AH36), our business strategy is customization-oriented, supplemented by spot inventory. To be factual, we maintain spot inventory of various materials in our warehouse, though the stock is not comprehensive—typically ranging from 500 to 1,200 tons per month. Given the specific requirements of shipbuilding plates in terms of classification society certifications, dimensions, and specifications, we do not intentionally stockpile inventory for any particular specification. (Our inventory is generated when a customer's customized order falls short of the mill's minimum order quantity, and we supplement the balance to fulfill the order.) If you happen to have a spot requirement, feel free to click here to check our current inventory.→ stock inquiry system.

Information You May Find Relevant

Pricing Range for AH36

Pricing is typically based on a benchmark price, with additional premiums applied for variations in thickness, width, and supplementary processing requirements. To illustrate, let's assume a base price "a" (denoted in RMB) applies to thicknesses of 14–30mm and widths of 2000–2500mm: 12mm thickness: a + 50 (thickness premium) 10mm thickness: a + 150 (thickness premium) 8mm thickness: a + 350 (thickness premium) 32–40mm thickness: a + 50 (thickness premium) 42–50mm thickness: a + 100 (thickness premium) + 200 (normalizing surcharge) 50–52mm thickness: a + 150 (thickness premium) + 200 (normalizing surcharge)

Request Technical & Commercial Support

Get Professional Support for Your AH36 Project

We supply classification-approved AH36 medium-high strength shipbuilding steel plate with 0°C impact toughness, 355 MPa yield strength, full traceability, flexible inspection options, and coordinated logistics support.

📋 Certification & Quality

• Adhere to classification society specifications and corresponding manufacturing standards

• Mill's EN 10204 3.1 certificate included in quality documentation

• Third-party onsite certification available upon request for customized plates

⚙️ Custom Solutions

• Custom thickness, width, length; widths ≤1600mm can be supplied via split delivery from double-width rolling

• 100% customizable: carbon equivalent, simulated post-weld, Z-direction properties, etc.

• Fastest delivery for hot-rolled custom plates: 10 days

Response Time: We typically respond to all inquiries within 24 hours

📩 Get AH36 Steel Plate Quotation

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