Product - Shipbuilding Plate Processing

Ship structure plate is called in brief ship plate. Because of the poor environment of ship, ship husk is apt to chemical erosion by sea water, E-chemical erosion and erosion by microbes. Ship body has to suffer wind and tide attack and stress alternation,. Shipshape is quite complicated for its process method, therefore the requirement for ship body structure steels is very high. First excellent tenacity is the key requirement. Besides, high intension, anti-erosion ability, welding ability, face quality and molding ability are also needed. In order to guarantee quality and enough tenacity, the requirement for the amount of manganese and carbon is restricted.

NCG series of digital controlled fire shearers in our company is high-efficiency, high precision and high reliability hot cutting equipment which combines computer control, precision mechanical transmission and oxygen fuel gas cutting, takes advantage of automatic program instead of annoying and low efficiency manual computation . therefore those shapes including beeline, round arc, non-round arc and combination of above mentioned shapes of plates and all shapes of spare parts can be cut exactly. It is fit for hot cutting steels for manufacturing industry such as shipbuilding industry.

properties and specification: Three strength grades and four quality grades of high intension structure steel classified by China classification society.

normal intension structure steel in quality classified by International and CCS : A,B,D,E.

according to its minimum yield point, strength of ship body structure steel classified as: normal intension structure steel and high intension structure steel.

Ship body structure steel( mechanical properties)
steel grade	yield point σs(MPa) not less than	tensile strength σb MPa	elongation not less than
A B D E	235	400-520	22
A32 B32 D32 E32	315	440-570	22
A36 B36 D36 E36	355	490-630	21
A40 B40 D40 E40	390	510-660	20

steel grade	chemical components of normal intension steel( melt composition)%
	C	Si	Mn	P	S	Als
A	≤ 0.21	≤ 0.50	≥ 2.5C	≤ 0.21	≤ 0.50	≥ 2.5C
B	≤ 0.21	≤ 0.35	0.80-1.20	≤ 0.21	≤ 0.35	0.80-1.20
D	≤ 0.21	≤ 0.35	0.60-1.20	≤ 0.21	≤ 0.35	0.60-1.20
E	≤ 0.18	≤ 0.35	0.70-1.20	≤ 0.18	≤ 0.35	0.70-1.20

Chemical elements of High intension steel( melt component)
steel grade		A32 A35 A40 D32 D36 D40 E32 E36 E40	F32 F36 F40
chemical composition %	C	≤ 0.18	≤ 0.16
	Si	≤ 0.50	≤ 0.50
	Mn	0.90~1.60	0.90~1.60
	S	≤ 0.035	≤ 0.025
	P	≤ 0.035	≤ 0.025
	Als	≥ 0.015	≥ 0.015
	Nb	0.02~0.05	0.02~0.05
	V	0.05~0.10	0.05~0.10
	Ti	≤ 0.02	≤ 0.02
	Cu	≤ 0.35	≤ 0.35
	Cr	≤ 0.20	≤ 0.20
	Ni	≤ 0.40	≤ 0.8
	Mo	≤ 0.08	≤ 0.08
	N		≤0.09(如含AIJF, ≤0.012)

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