|
 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) |
Chemical elements of High intension steel( melt component) |
|
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 |
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) |
|
|
steel grade |
chemical components of normal intension steel( melt composition)% |
|
|
C |
Si |
Mn |
P |
S |
Als |
|
A |
≤ 0.21 |
≤ 0.50
|
≥ 2.5C
|
≤ 0.035 |
≤ 0.035
|
- |
|
B |
≤ 0.21
|
≤ 0.35
|
0.80-1.20
|
≤ 0.035
|
≤ 0.035
|
- |
|
D |
≤ 0.21
|
≤ 0.35
|
0.60-1.20 |
≤ 0.035
|
≤ 0.035
|
0.015
|
|
E |
≤ 0.18
|
≤ 0.35
|
0.70-1.20
|
≤ 0.035
|
≤ 0.035
|
0.015
|
|
|
