The inspection and test method standards for shipbuilding steel plates mainly include the following specific contents:
I. Chemical composition analysis
Spectral analysis
Use atomic emission spectrometers or other suitable spectral equipment to conduct chemical composition analysis on shipbuilding steel plates.
It can quickly determine the content of various elements in the steel plate, such as major elements such as carbon, silicon, manganese, sulfur, and phosphorus, as well as some alloy elements.
During the analysis process, the sample needs to be prepared to ensure a flat and pollution-free surface to obtain accurate analysis results.
Chemical analysis
React chemical reagents with steel plate samples, and then determine the element content by methods such as titration and gravimetry.
Although the chemical analysis method is relatively cumbersome and time-consuming, it has higher analysis accuracy for some elements.
It is usually used as a supplementary method for spectral analysis to accurately determine key elements or verify spectral analysis results.

Standard: ABS, LR, GL, DNV, BV , NK, KR, RINA, CCS

Steel Grade : AH32, AH36, AH40, DH32, DH36, DH40, EH32, EH36, EH40, FH32, EH36, FH40, API 2HCR50

 

 

 

II. Mechanical property testing
Tensile test
Take standard samples from shipbuilding steel plates and conduct tensile tests on a tensile testing machine.
Measure the relationship between force and deformation of the sample during the tensile process to determine mechanical property indicators such as the yield strength, tensile strength, and elongation of the steel plate.
During the test, parameters such as test temperature and loading speed must be strictly controlled to ensure the accuracy and comparability of the test results.
Impact test
Use an impact testing machine to conduct impact tests on shipbuilding steel plates.
Impact tests are usually conducted at different temperatures to evaluate the toughness of the steel plate.
Measure the impact absorption energy to judge the anti-fracture ability of the steel plate when subjected to impact loads.
Hardness test
Use a hardness tester to conduct hardness tests on shipbuilding steel plates, such as Brinell hardness, Rockwell hardness, or Vickers hardness.
Hardness testing can quickly understand the hardness distribution of the steel plate and indirectly reflect the strength and heat treatment state of the steel plate.
For some steel plates with special requirements, microhardness testing may also be required to evaluate the hardness changes in local areas.

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