Can AH36 Take the Place of AH32 Marine Steel Plate?

AH this brand is not the standard brand of China, but the international standard. It is specialized in marine steel. It is the brand of professional steel.

AH36, "A" is the impact-test class at 0 °C (the other classes being D at -20 °C, E at -40 °C and F at -60 °C), "H" denotes high-strength hull steel, and the number indicates the yield class: 32 = 315 MPa and 36 = 355 MPa minimum yield strength.

AH32: is a high strength grade a ship steel with a pressure of 315 Mpa. There is a difference that can not be replaced!

AH36 delivery status: according to the performance and user needs, the steel plate can be hot-rolled, controlled rolling, normalizing, annealing, tempering, normalizing + tempering, quenching and tempering and other delivery;

AH36 flaw detection and thickness direction performance: can produce additional inspection requirements and Z15-Z35 anti tear (thickness direction performance) steel plate, also can press ASTM, A770 and other standards to provide Z performance steel plate.

AH32 and AH36 are both marine steel plate. Shipbuilding steel, used for the manufacture of ship and inland ship hull structures, usually of high quality carbon steel and high quality low alloy steel. Marine steel requires a certain strength, toughness and a certain resistance to low temperature and corrosion resistance, and requires good welding performance.

Generally AH36 refers to the hot-rolled hull structural steel that are produced for hull structures according to the construction specifications of the classification society. It is the special steel for order, production and sales, commonly including the ship plate, section steel and so on.

As a kind of shipbuilding steel plates, AH32 steel is mainly produced for the hull, deck ,etc. of ocean, coastal and inland waterway ships.
AH36 Marine Steel Plate, H stands for high strength while 36 for 355 MPa, A is the steel grade that can be divided into 4 grades( A, B, D, E). So the meaning of this code is the high strength class A shipbuilding steel with 355 MPa Yield strength.

AH32: the pressure is the high strength grade A shipbuilding steel with 315 MPa yield strength.
The shipbuilding steel plates refer to the hot-rolled steel plates according to the construction specification of the classification society and are mainly used in the hull, deck, etc. of ocean, coastal and inland waterway ships. Due to the following main reasons, the hull structure desires for high-quality steels:
1) The ship works in a tough environment, and the hull shell is subjected to the chemical corrosion, electrochemical corrosion as well as marine life and microbial corrosion.
2) It withstands the impact of large waves and alternating load.
3) It is complicated for the ship processing formation and so on.
Good toughness is the most critical point. Besides, it demands high strength, good corrosion resistance, welding property, processing molding performance and surface quality.

Cost: AH36 costs slightly more per ton, but thinner plates can offset the difference.

Weldability: both grades weld with standard shipyard procedures; consumables should match the strength level.

Certification: the substituted grade must be certified by the relevant classification society with mill certificates.

More information about AH32 ship plate and AH36 Marine Steel Plates application and introduction, and if you need factory price of AH32 and AH36 steel stock and price, contact us at any time. Welcome to call for us. We strive for excellence in quality and meticulous in service. We hope to cooperate with us in the near future.

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If you want to learn about or purchase other ship plates from GNEE, you can send an email to info@gneesteels.com. We will be very happy to serve you.

FAQ

Q: Can AH36 be used instead of AH32?
A: Yes - AH36 meets or exceeds all AH32 requirements (355 MPa versus 315 MPa yield, same 0 °C impact class), so it can substitute with a strength margin after design re-verification.

Q: What is the difference between AH32 and AH36?
A: The minimum yield strength (315 MPa versus 355 MPa) and the tensile range; both are 0 °C impact class hull steels.

Q: Is AH36 more expensive than AH32?
A: Slightly, per ton; the higher strength allows thinner plates, which can reduce the total material cost for load-critical designs.

Q: Do the welding requirements differ?
A: Both use standard shipyard procedures; consumables should match the strength level, and preheat follows the WPS for thicker sections.

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