Shipbuilding Steel Plate RINA Spec. AH32 AH36 AH40 A B D E

 

 

Grades A, B, D, E

 

Grade A: This is a basic grade with moderate strength and toughness requirements. It is suitable for general shipbuilding applications where the operating conditions are not overly demanding.

Grade B: Has slightly improved properties compared to Grade A, providing better performance in terms of strength and toughness.

Grade D: Offers enhanced low - temperature toughness compared to the previous grades. This is crucial for ships operating in colder waters or in environments where low - temperature impacts are a concern.

Grade E: Has the highest low - temperature toughness among these grades. It is designed for ships that operate in extremely cold conditions or in areas where the risk of brittle fracture at low temperatures is high.

 

Specification we supply：

Thickness	2-200mm
Width	1000-4000mm
Length	5000-15000mm

 

The acceptance standards for shipbuilding steel plates mainly include the following aspects:

 

Chemical Composition

 

Requirements for Element Content: The chemical composition of shipbuilding steel plates must comply with the relevant standard regulations. For example, for common shipbuilding steels such as AH32 and DH36, the contents of elements such as carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S) have strict range limitations. For example, the carbon content is generally controlled at a low level to ensure good welding performance and toughness; the contents of impurity elements such as sulfur and phosphorus should be as low as possible to reduce the brittleness of the steel.

Furnace analysis and product analysis: Furnace analysis is required during acceptance to ensure that the chemical composition of each furnace of molten steel meets the requirements. At the same time, product analysis of the finished steel plate is also required to verify the uniformity of its chemical composition.

 

Toughness Indexes:

Impact Toughness: It is measured by impact test, and it is required that the shipbuilding steel plate has sufficient impact absorption energy at a certain temperature (such as - 20 °C, - 40 °C, etc.) to prevent brittle fracture in a low - temperature environment. For example, for ships sailing in cold sea areas, the impact toughness requirements of the shipbuilding steel plates used at low temperatures are higher.

Elongation: It measures the plastic deformation ability of the steel before tensile fracture. Generally, the elongation requirement of shipbuilding steel plates is about 20% - 25%. The higher the elongation, the better the plasticity of the steel, and it is less likely to break suddenly during the stress deformation process.

 

Dimensions and Shapes

 

Dimensional Tolerances: The thickness, width, and length of shipbuilding steel plates should meet the specified dimensional tolerance range. For example, the thickness tolerance is usually between ±0.3 - ±1.0mm, depending on the thickness specification of the steel plate. There are also corresponding standards for the tolerances of width and length to ensure the assembly accuracy of the steel plates during the shipbuilding process.

Shape Requirements: The shape indexes such as flatness and straightness of the steel plate also need to meet the acceptance standards. Excessive flatness deviation will affect the welding quality and the flatness of the hull structure; poor straightness will bring difficulties to the manufacturing and assembly of hull sections.

 

 

 

Non - destructive Testing

 

Ultrasonic Flaw Detection: Use ultrasonic flaw detection to detect whether there are defects such as delamination and slag inclusion inside the steel plate. The flaw detection results should meet the corresponding flaw detection standards, such as the flaw detection sensitivity and defect amplitude parameters should be within the specified range.

Magnetic Particle Flaw Detection or Penetrant Flaw Detection: For surface and near - surface defects, magnetic particle flaw detection (suitable for magnetic materials) or penetrant flaw detection (suitable for non - magnetic materials) can be used for detection. These flaw detection methods can detect fine cracks and other defects to ensure the surface quality of the steel plate.

 

 

 

 

 

 

Why Choose Us?
We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our Shipbuilding Steel Plate RINA Spec. AH32 AH36 AH40 A B D E, and develop new technical specifications and processes.
Our customers trust us to deliver high-quality Cold-rolled Steel products on time and on budget.
We strictly implement the warm and thoughtful after-sales service, adhere to the development of good professional ethics.
We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
We adhere to the customer-centric and brand-oriented business philosophy, and continue to provide customers with reliable and excellent products and services.
Our factory is committed to upholding the highest standards of safety and quality.
All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
Our Cold-rolled Steel products are known for their durability and reliability.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

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