• Model NO.：KM-20200509
• Stock：Stock
• Transport Package：in Bundles
• Specification：50-2200mm
• Trademark：kingmetal
• Origin：China
• HS Code：7326901900
• Production Capacity：10000 Ton,Month

0.10~0.50

≤0.04

≤0.04

DH32

≤0.18

0.90~1.60

≥0.015

0.10~0.50

≤0.04

≤0.04

EH32

≤0.18

0.90~1.60

≥0.015

0.10~0.50

≤0.04

≤0.04

AH36

≤0.18

0.7~1.60

≥0.015

0.10~0.50

≤0.04

≤0.04

DH36

≤0.18

0.90~1.60

≥0.015

0.10~0.50

≤0.04

≤0.04

EH36

≤0.18

0.90~1.60

≥0.015

0.10~0.50

≤0.04

≤0.04

C (carbon) is an indispensable strengthening element in steel, but the increase in C content reduces the low-temperature impact toughness of steel and deteriorates the weldability of steel. Therefore, it is necessary to control the C content in the steel.

According to the experience of producing aluminsum-containing steel, in order to ensure the aluminum content in the steel and the fluidity of the molten steel, the method of pre-deoxidation is strictly to control the carbon content of the end point and the alloying of the large-pack alloy to control the oxidation of the molten steel. The way of adding aluminum.

In order to ensure good low temperature impact toughness of the steel grade, the rolling of the 355MPa class ship plate adopts a strict type II controlled rolling process.

Steel Grade

Thickness/mm

Yield point/ MPa

Tensile strength/ MPa

Elongation/ %

V-type impact test

Temperature/ 

ºC

Average impact absorption

workA_kv/J

Vertical

Horizontal

A

≤50

≥235

400~490

≥22

-

-

-

B

≤50

≥235

400~490

≥22

0

≥27

≥20

D

≤50

≥235

400~490

≥22

-10

≥27

≥20

E

≤50

≥235

400~490

≥22

-40

≥27

≥20

AH32

≤50

≥315

440~590

≥22

0

≥31

≥22

DH32

≤50

≥315

440~590

≥22

-20

≥31

≥22

EH32

≤50

≥315

440~590

≥22

-40

≥31

≥22

AH36

≤50

≥355

490~620

≥22

0

≥34

≥24

DH36

≤50

≥355

490~620

≥22

-20

≥34

≥24

EH36

≤50

≥355

490~620

≥22

-40

≥34

≥24

Processing for Different Grades

Grade A and B

The general strength of grade A and B shipbuilding steel plates can meet the requirements of process and mechanical properties through ordinary rolling, so the production process is relatively simple.

Grade D, E (DH32, DH36, EH 32, EH 36)

Grade D and E series (inlcuding AH32/36, DH32, DH36, EH32, EH36) shipbuilding steel plates require good low temperature toughness and good welding performance. The production high-strength shipbuilding steel plate needs to be normalized by means of controlled rolling and controlled cooling or heat treatment processes with more complete equipment. At the same time, the internal steel purity of the supplied billets is required to be high, especially the content of S, P, N, 0 and H in the steel should be strictly controlled.

Alloy Elements Added to Improve Toughness

In order to ensure the performance of high-strength ship plates, micro-alloying technology is adopted. By adding Nb, V, Ti and other alloying elements to the steel, combined with the controlled rolling process, the grain is refined and the toughness is improved.

Direction of Development for Shipbuilding Plate

High strength, high specification, with the ship's large-scale and safety, and changes in coating specifications, the demand for ordinary A-class panels is gradually reduced, and the demand for high-strength panels is increasing, which is concentrated in large ships of 5m wide. Plate, 200-300mm thickness special thick ship board.