NK KA36 steel plate is a kind of high-strength shipbuilding steel plate that complies with the standards of Nippon Kaiji Kyokai (NK), which is the Japanese classification society. Here is a detailed introduction:

Basic Information

 

 

Rolling Type: It belongs to high-strength ship plates and is designed to meet the specific requirements of modern shipbuilding for materials with better strength and toughness.

 

Mechanical Properties

 

Yield Strength: The yield strength of NK KA36 steel plate is required to be ≥ 355 MPa. This relatively high yield strength enables the steel plate to withstand greater external forces without undergoing plastic deformation prematurely, ensuring the structural integrity of the ship under various working conditions.

 

Elongation: The elongation rate is also an important indicator of its plasticity. For example, when the gauge length is 50 mm, the elongation rate is usually required to be ≥ 21%, showing that the steel plate has a certain degree of plastic deformation ability to absorb and disperse external energy under impact or other dynamic loads.

Impact Toughness

 

NK KA36 steel plate has strict requirements for impact toughness. It needs to maintain good toughness at specific low temperatures. For example, at -20 °C test temperature, the average impact energy of the steel plate in the longitudinal direction should meet the corresponding standards set by the NK classification society to ensure that the steel plate can resist brittle fracture in cold environments that ships may encounter during voyages.

Delivery Condition

 

It can be delivered in various states such as hot rolling, controlled rolling, and thermo-mechanical control process (TMCP). Depending on the specific requirements of users and the actual production situation, different delivery conditions can be selected to optimize the performance of the steel plate. For example, TMCP can refine the grain structure of the steel plate and improve its strength and toughness more effectively.

 

 

 

 

NK KA36high Strength Chemical Composition
Grade	The Element Max (%)
	C	Si	Mn	P	S	Al	N
NK KA36	0.18	0.50	0.90-1.6	0.035	0.035	0.015
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.05-0.10	0.02	0.35	0.2	0.4	0.08

 

 

 

Testing and Certification

 

A series of tests need to be carried out, including tensile tests, impact tests, and ultrasonic flaw detection. The tensile test is used to verify the yield strength, tensile strength, and elongation rate of the steel plate. The impact test is to assess its impact toughness at the specified temperature. Ultrasonic flaw detection is to check for internal defects such as cracks and inclusions in the steel plate.

Once the steel plate passes all the required tests and meets the standards of the NK classification society, it can obtain the relevant certification, which indicates that it is qualified for use in shipbuilding and related fields and can be recognized by the international shipbuilding market.

 

In general, NK KA36 steel plate, with its excellent mechanical properties and good quality, plays an important role in the construction of modern high-performance ships and offshore engineering structures.

 

 

 

 

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