What's the hull structural steel?

Shipbuilding steel generally refers to hull structural steel, which refers to the steel used to manufacture hull structures produced according to the requirements of classification society construction specifications. It is often used as a special steel for ordering, scheduling, and sales including shipbuilding plates, angles and section steel.

At present, several major iron and steel enterprises in China have hull sttructural steel production line, and can produce shipbuilding steel in different countries according to user requirements, such as the United States, Norway, Japan, Germany, France, etc. The specifications are as follows: CCS, ABS, GL, BV, DNV, KDK, LR.

Category for hull sttructural steel

The structural grades of hull structural steel according to its minimum yield point are: general strength structural steel and high strength structural steel.

The general strength structural steels of China Classification Society are divided into four quality grades: A, B, D, and E; the high strength structural steels of China Classification Society have three strength grades and four quality grades: AH32,  DH32, EH32, FH32, AH36, DH36, EH36, FH36, AH40, DH40, EH40, FH40

Mechanical properties and chemical composition

General strength structural steel technical data

High strength structural steel technical data

Precautions for acceptance inspection of ship steel:

1. Review of quality certificate:

The steel mill must deliver according to the user's requirements in accordance with the specifications agreed in the contract and provide the original quality certificate. The certificate must have the following:

(1) Specification requirements;

(2) Number of quality record and certificate number;

(3) Furnace batch number, technical grade;

(4) chemical composition and mechanical properties;

(5) Certificate of approval of classification society and signature of surveyor.

2. Physical examination:

For the delivery of marine steel, the manufacturer's logo should be on the physical object. Specifically:

(1) Classification society approval mark;

(2) Use paint to frame or paste marks, including technical parameters such as furnace batch number, standard level, length and width dimensions, etc .;

(3) The appearance is smooth and smooth, without defects.