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LR marine grade steel plates for shipbuilding use

LR marine grade steel plates for shipbuilding use

LR marine grade steel plates for shipbuilding use

Thickness: 3-150mm
Width: 1220-4200mm
Length: 5000-18000mm Note:coil thickness≤25mm

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LR marine grade steel plates are intended primarily for use in ship construction. LR marine grade steel plates are also known as LR shipbuilding steel plates and LR hull structural steel plates. According to the minimum yield point, LR marine grade steel plates can be divided into general strength LR marine grade steel plates and higher strength LR marine grade steel plates.

The general strength LR marine grade steel plates mainly cover below steel grades:
LR grade A, LR grade B, LR grade D, LR grade E.

The higher strength LR marine grade steel plates mainly cover below steel grades:
LR grade AH32, AH36, AH40, DH32, DH36, DH40, EH32, EH36, EH40, FH32, FH36, FH40.

Chemical composition of ordinary-strength LR marine grade steel plates:


Element

LR grade A

LR grade B

LR grade D

LR grade E

 

Deoxidation and Thickness (t) in mm

 

t>2.0 in [50mm]

t>2.0 in [50mm]

t>1.0 in [50mm]

 

C

0.21

0.21

0.21

0.18

Mn min

2.5XC

0.6

0.6

0.7

Si

0.5

0.35

0.10-0.35

0.10-0.35

P

0.035

0.035

0.035

0.035

S

0.035

0.035

0.035

0.035

Ni

-

-

-

 

Cr

-

-

-

-

Mo

-

-

-

-

Cu

-

-

-

-

C+Mn/6

0.4

0.4

0.4

0.4


Chemical composition of higher-strength LR marine grade steel plates:


Element

Chemical composition (heat analysis% max)

 

AH/DH/EH32 AH/DH/EH36
and AH/DH/EH40

FH32/36/40

C

0.18

0.16

Mn

0.90-1.60

0.90-1.60

Si

0.10-0.50

0.10-0.50

P

0.035

0.025

S

0.035

0.025

Al min

0.015

0.015

Cb

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

0.40

Mo

0.08

0.08

N

-

0.009


Mechanical properties of ordinary-strength and higher-strength LR marine grade steel plates:


Grade

Tensile Strength ksi [Mpa]

Yield Strength min ksi [Mpa]

Elongation in 8 in [200mm] %

Elongation in 2 in [50mm] min %

Ordinary strength

58-75 [400-520]

34 [235]

21

24

A B D E

Higher strength

 

AH32 DH32 EH32 FH32

64-85 [440-590]

46 [315]

19

22

AH36 DH36 EH36 FH36

71-90 [490-620]

51 [355]

19

22

AH40 DH40 EH40 FH40

74-94 [510-650]

57 [390]

19

22

LR marine grade steel plates are mainly used to build the hull structure of ocean going, coastal and inland navigation ships. Other than LR, we also cooperated with ABS, BV, CCS, DNV GL, RINA, NK, KR, RMRS, etc. classification societies. The lower marine grade steel plates thickness limit we have is 3mm.

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Address: XICHENG SCIENCE & TECHNOLOGY BUILDING HIGH-TECH DEVELOPMENT ZONE, ZHENGZHOU, CHINA
Tel: +86-371-86151827
E-mail: [email protected]
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