CCS-AH32 AH36 Marine Steel Plate For Ship Building

 

The following are some methods for testing the quality of CCS - AH32 ship plates:

 

Mechanical property testing

 

Tensile test

Yield strength: Conduct the test on a tensile testing machine according to relevant standards (such as GB/T 228.1 - 2010). For CCS - AH32 ship plates, the yield strength should not be lower than 315MPa. If the test result is lower than this value, it may indicate that the quality of the ship plate does not meet the requirements.

Tensile strength: Also in the tensile test, the tensile strength of CCS - AH32 ship plates should be in the range of 440 - 570MPa. The tensile strength value is obtained by measuring the maximum tensile force that the sample can withstand before fracture during the tensile process and dividing it by the original cross - sectional area of the sample to determine whether it meets the standard.

Elongation: The elongation reflects the plasticity of the material. After the tensile test, measure the ratio of the elongation of the sample after fracture to the original gauge length. The elongation of CCS - AH32 ship plates should meet the corresponding standard requirements. Generally, the elongation is required to be not less than 22% to ensure that the ship plate has sufficient plasticity during the force - deformation process.

 

 

Specification we supply：

Thickness	3-200mm
Width	1500-4000mm
Length	5000-15000mm

 

 

Impact test

Low - temperature toughness: CCS - AH32 ship plates need to have good low - temperature toughness, and the impact test is usually carried out at - 20 °C (in accordance with the GB/T 229 - 2020 standard). Use an impact testing machine to impact the samples with V - shaped or U - shaped notches and measure the impact absorption energy. If the impact absorption energy is too low, it indicates that the ship plate is prone to brittle fracture in a low - temperature environment, and there may be problems with the quality.

 

Chemical composition analysis

 

Element content determination

Elements such as carbon (C) and manganese (Mn): Use equipment such as a spectral analyzer to conduct a chemical composition analysis on the ship plate. In CCS - AH32 ship plates, the carbon content generally does not exceed 0.18%, and the manganese content is between 0.9 - 1.65%. Accurately determine the content of these elements to ensure that they are within the specified range, because the content of these elements has a direct impact on the strength, toughness and other properties of the ship plate.

Impurity element control: In addition to the main alloying elements, attention should also be paid to the content of impurity elements. For example, the content of sulfur (S) and phosphorus (P) should generally be controlled not to exceed 0.035% respectively. Excessive impurity element content will reduce the quality and performance of the ship plate.

 

Appearance quality inspection

 

Surface quality

Flatness: Check whether the surface of the ship plate is flat and smooth by visual observation and using a straightedge. There should be no obvious unevenness, waviness and other defects to ensure that it will not affect the stability and sealing of the structure during subsequent processing and use.

Defect inspection: Carefully check whether there are cracks, inclusions, delamination and other defects on the surface of the ship plate. These defects may lead to stress concentration and reduce the bearing capacity and service life of the ship plate. For some minor defects, flaw detection equipment such as ultrasonic flaw detector or magnetic particle flaw detector can be used for detection.

 

 

Welding performance test

 

Welding procedure qualification

Welding joint strength test: Use the same welding process as in the actual shipbuilding process (such as manual arc welding, gas shielded welding, etc.) to weld the ship plate, and then conduct tensile tests, bending tests, etc. on the welded joint to test whether the strength and toughness of the welded joint meet the requirements. The strength of the welded joint should not be lower than that of the base metal to ensure that the welded part will not become a weak link during the operation of the ship.

Welding crack sensitivity test: Observe whether cracks appear in the weld during and after welding. Methods such as metallographic analysis can be used to conduct a microscopic structure analysis on the weld to evaluate the quality of the welded joint and judge the welding performance of the ship plate. If the ship plate is prone to cracks during welding, it may affect the safety of the ship structure.

 

 

 

 

 

 

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 CCS-AH32 AH36 Marine Steel Plate For Ship Building, 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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