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Grade D marine steel

When a metal is exposed to underwater or wet environments, marine grade metals may be necessary to prevent the material from failing under the conditions. To be considered a marine grade, the material must be able to resist corrosive effects that are common in a water environment. To achieve this, special alloying elements are added to these grades in order to defend against corrosion.

Product Details

Grade D marine steel introduction

Shipbuilding steel plate is hot rolled steel plate which is produced as per Bureau of Shipping Standard and is used for manufacturing hull structure. According to minimum yield strength, it is classified as general strength and high strength hull structural steel. As per CCS standard, general strength structural steel has four grades: CCSA, CCSB, CCSD, CCSE; high strength structural steel has three strength grades, each strength grade has four quality grades.

At present, the four international standards for marine platform steels, namely En10225 and BS7191 (European standard), AP1 (US standardNorsok (North Sea Standard), have clear regulations on the mechanical properties and design and manufacture of steel for offshore platforms.

The main grades of high-strength steel for world marine platforms are yield strengths of 355,420, 460, 500, 550,620, 690 MPa, and lowtemperature performance requirements of at least-40'c, or even -60', resistance to lamellar tearing performance Z To 35%, the corrosionresistance is good.

Requirements for chemical composition of steel for marine engineering.

The factors afecting the performance of steel are: chemical composition, smelting and casting, rolling and heat treatment processes, etc.which are mainly composed of chemica components: sulfur and phosohorus content directly affect the performance of the thickness directionof the steel plate. Sulfur is the most severe element of segregation in continuous casting billets. Sulfur can cause the steel to be hot and britlecausing cracks in the steel during high temperature forging, Many loose and vent holes are produced during welding.

Phosphorus is an element which is second only to the high degree of segregation of sulfurin the continuous casting billet of steel, and thedifusion rate of phosphorus in the iron solid solution is smal, so the segreation of phosphorus is difficult to eliminate, thereby seriouslyafecting the pertormance of the steel. Phosphorus is dissolved in ferrite in the form of a solid solution. This solid solution is very britle, and thephosphorus-rich repion formed promotes britleness of steel and reduces the plasticity, toughness and weldability of steel. it is easy to causecracking of steei curing ot working, ad cracks are ikely to occur curing welding, Phosphorus is an element that owers the surtace tension oiteel. As the phosohorus content increases, the surface tension of the molen stee decreases signifcantly therebv reducing the crackresistance of the steel.

Theretore. the stee piate or ofsnore paorms has strict reauirements on the content of su fur and phosohorus, and the content of su fur is strictly controlled.

Performance requirements for marine engineering steel.

Because the marine platform is immersed in seawater all the vear round, it has to withstand all kinds of bad sea conditions. Therefore,theechnical indexes of steel for offshore platforms are extremely high, not only have high resistance to atmospheric corrosion and seawatercorrosion, but also require good mechanics and processing properties, etc, The performance requirements for steel for marine platformsinclude:

(1) lt has high strength and resists wind current impact above the water surface.
(2) It has good low temperature impact properties.
(3) It has good welding performance.
(4) Steel purity requirements.
(5) Requirements for corrosion resistance.


Kuaima steel is a professional manufacturer and supplier of Shipbuilding Plate with high quality and reasonable price. If you want to know more about Shipbuilding Plate products or Shipbuilding Plate price please feel free to contact us, we will reply you within 24 hours.


Chemical composition & Mechanical Properties of Shipping Plate

Chemical composition of Shipping Plate:

Steel Grade

C. %

Si.%

Mn.%

P.%

S.%

Y.S/MPA

T.S/MPA

EL.%

A

≤0.21

≤0.5

 ≥2.5C

≤0.035

≤0.035

≥235

400-520

≥22

B

≤0.21

≤0.35

0.8-1.2

≤0.035

≤0.035

≥235

400-520

≥22

D

≤0.21

≤0.35

0.6-1.2

≤0.035

≤0.035

≥235

400-520

≥22

E

≤0.18

≤0.35

0.7-1.2

≤0.035

≤0.035

≥235

400-520

≥22

 

Mechanical Properties of Shipping Plate:

Steel Grade

C. %

Si.%

Mn.%

P.%

S.%

Y.S/MPA

T.S/MPA

EL.%

A32

≤0.18

≤0.5

0.9-1.6

≤0.035

≤0.035

≥315

440-570

≥22

D32

≤0.18

≤0.5

0.9-1.6

≤0.035

≤0.035

≥315

440-570

≥22

E32

≤0.18

≤0.5

0.9-1.6

≤0.035

≤0.035

≥315

440-570

≥22

F32

≤0.16

≤0.5

0.9-1.6

≤0.025

≤0.025

≥315

440-570

≥22

A36

≤0.18

≤0.5

0.9-1.6

≤0.035

≤0.035

≥355

490-630

≥21

D36

≤0.18

≤0.5

0.9-1.6

≤0.035

≤0.035

≥355

490-630

≥21

E36

≤0.18

≤0.5

0.9-1.6

≤0.035

≤0.035

≥355

490-630

≥21

F36

≤0.16

≤0.5

0.9-1.6

≤0.025

≤0.025

≥355

490-630

≥21

A40

≤0.18

≤0.5

0.9-1.6

≤0.035

≤0.035

≥390

510-660

≥20

D40

≤0.18

≤0.5

0.9-1.6

≤0.035

≤0.035

≥390

510-660

≥20

E40

≤0.18

≤0.5

0.9-1.6

≤0.025

≤0.025

≥390

510-660

≥20

F40

≤0.16

≤0.5

0.9-1.6

≤0.025

≤0.025

≥390

510-660

≥20


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Why choose us

Behind the growth and success ofuaima Steel is years of hard work and dedication in the steel industry and meeting customers' needs on time. Advanced technology, standard products, certified quality standards and the best customer service make l is years of hard work and dedication in the steel industry and meeting customers' needs on time. Advanced technology, standard products, certified quality standards and the best customer service make Kuaima Steel a true leader in zhe global marker

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lndustries Served

Every industry has its unique set of material specifications and needs. That’s why you can count on the exceptional experience and industry knowledge of the professionals at Kuaima Steel - Meeting the Exact Needs of Every Industry That Uses steel.

  • Machinery manufac- turing industry
  • Power Generation
  • Oil & Gas
  • Manufacturing
  • Construction
  • Ship Building
  • Automobile manufacturing
  • Pipe Fabrication

lndustries Served

Every industry has its unique set of material specifications and needs. That’s why you can count on the exceptional experience and industry knowledge of the professionals at Kuaima Steel - Meeting the Exact Needs of Every Industry That Uses steel.

  • Machinery manufac- turing industry
  • Power Generation
  • Oil & Gas
  • Manufacturing
  • Construction
  • Ship Building
  • Automobile manufacturing
  • Pipe Fabrication

Our main export country

We are a well known worldwide exporter of Shipbuilding steel plate , Ireland, Portugal, Gambia, Thailand, Ukraine, United Kingdom, Netherlands, South Africa, Spain, Turkey, Italy, Libya, Romania, Puerto Rico, Azerbaijan, United Arab Emirates, Pakistan, Philippines, Ghana, Slovakia, Germany, Saudi Arabia, Afghanistan, China, Bolivia, Switzerland, Bangladesh, Taiwan, Oman, Egypt, Greece, Norway, Singapore, Bulgaria, Estonia, Belgium, Yemen, Hong Kong, Ecuador, Sri Lanka, Nepal, Belarus, Finland, Gabon, Iran, Canada, Argentina, Lebanon.

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