RINA Grade A B D E Marine Steel Plate

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RINA Grade A B D E Marine Steel Plate

RINA is a founding member of the International Association of Classification Societies(IACS),formed in 1968. The RINA fleet is recognized by approximately 116 international flag authorities. RINA integrated services for the complate shipping cycle including design, building, shipyard management, inspection and testing of materials/components and regular inspections to maintain the class are used by freight, ferries, ro-ro, passenger ships, yachts, cruise ships, navy, LGN and other

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Overview

Brief introduction of marine steel plate

Marine steel plate refers to structural steel used in ship building. It is considered a marine grade and 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 agaist corrosion.While most carbon steel is not suited for marine environments, there are several marine grade carbon steels that have been approved by the different societies for shipbuilding applications.

Structural steel for ship hulls is divided into strength classes according to its minimum yield strength: general strength structural steel and high strength structural steel. Maine steel plate refers to hot rolled steel plate produced in accordance with the requirements of the classication society for the construction of ship hull structures.

There are 9 main classification societies in worldwide.
A.B.S    American Bureau of Shipping
B.V.     Bureau Veritas
C.C.S.   China Classification Society
D.N.V   Det Norske Veritas
G.L.    Germanischer Lloyd
K.R.    Korean Register of Shipping
L.R.    Lloyd’s Register of Shipping
N.K.    Nippon Kaiji Kyokai
R.I.N.A Registro Italiano Navale

RINA A steel is a kind of hot rolled general tensile strength steel. General-strength RINA shipbuilding steel comes in 12 grades of 3 strengths,Grade A is one of the grades. Grade A steel plates have yield strength of 235 MPa, and ultimate tensile strength of 400-520 MPa. All the RINA A shipbuilding Steel offered by Gnee can be certificated by RINA

RINA is a founding member of the International Association of Classification Societies(IACS),formed in 1968. The RINA fleet is recognized by approximately 116 international flag authorities. RINA integrated services for the complate shipping cycle including design, building, shipyard management, inspection and testing of materials/components and regular inspections to maintain the class are used by freight, ferries, ro-ro, passenger ships, yachts, cruise ships, navy, LGN and other specialist carrier vessels.
Grade A steel is the impact force subjected to 20 ° C
Grade B steel impact force at 0 ° C
Grade D steel impact force at -20 ° C
Grade E steel impact force at -40 ° C

Shot blasting service
Shot blasting is a method used to clean or polish steel when enhanced surface finishes are required. Shot blasting is used in almost every industry we serve. Especially in shipbuilding, rail,structural fabrication and more.

Specifications range
Thickness:2.5-120mm
Width:1000-3000mm
Length: As request

Chemical composition and mechanical properties

Chemical Composition

Steel grade	C	Si	Mn	P	S	Als
Grade A	≤0.21	≤0.50	≥2.5C	≤0.035	≤0.035	-
Grade B	≤0.21	≤0.35	0.8-1.2	≤0.035	≤0.035	-
Grade D	≤0.21	≤0.35	0.6-1.2	≤0.035	≤0.035	≥0.015
Grade E	≤0.18	≤0.35	0.7-1.2	≤0.035	≤0.035	≥0.015

Processing for Different Grades
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.

Mechanical Properties

Steel grade	Yield point/MPa	Tensile point /MPa	Elongation/%	Temperature/° C	V-type impact test
					Akv/J
					≤50MM	50-70MM	70-100MM
Grade A	235	400-520	≥22	20	-	34/24	41/27
Grade B	235	400-520	≥22	0	27/20	34/24	41/27
Grade D	235	400-520	≥22	-20	27/20	34/24	41/27
Grade E	235	400-520	≥22	-40	27/20	34/24	41/27

About us

Founded in 2014, Jiyue Steel Co., Ltd. initially focused on providing high-quality steel for the rapid development of China's infrastructure. Based on the advantages of steel resources and good reputation in the domestic market, combined with the huge demand for steel products in the international market, the company started its international business in 2016 and successfully passed the ISo9001:2008 quality management system certification.

With high quality steel products and professional services, Jiyue has won international praise in infrastructure, shipbuilding, petroleum and other industries, and gradually grew into a shining star in the steel export industry. With the exploration and innovation of the company, gradually formed the advantages of steel plate products, and established its own machining center, in order to meet the diversified requirements of customers.

Packaging & shipping

Packaging and loading:

Packaging: According to customers' needs, use wrapping paper. If the transportation period exceeds 10 days or encounters special climate, we will use waterproof packaging and add plastic film to prevent moisture, water and rust.

Loading: We use the wooden pallet,triangular wood to fix the coil,and the steel wire rope to hold on the both side. That can prevent from the crush injury effectively.