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Rolled Steel for Shipbuilding
(Inverted Angles)

Our inverted angles are widely appreciated in the shipbuilding industry as shipbuilding stern frames. Also compliant with PSPC,* and highly rated at shipyards for their work performance.

*PSPC: Performances Standard for Protective Coatings, criteria related to coatings applied to ships set by the International Maritime Organization (IMO).

Shape/Dimensions

◆Cross-section dimensions, cross-sectional area, mass

Standard cross-section dimensions(mm) Cross-sectional area Unit mass
A×B t1 t2 r1 r2 (cm2 (kg/m)

200×90

200×90

8

9

14

14

14

14

7

7

27.80

29.66

21.8

23.3

200×91

10

14

14

7

31.66

24.8

250×90

250×90

250×90

250×90

250×90

9

9

10

11

12

14

15

15

16

16

17

17

17

17

17

8.5

8.5

8.5

8.5

8.5

34.31

35.12

37.47

40.61

42.95

26.9

27.6

29.4

31.9

33.7

300×90

300×90

300×90

300×90

10

11

12

13

16

16

17

17

19

19

19

19

9.5

9.5

9.5

9.5

43.38

46.22

49.84

52.67

34.1

36.3

39.1

41.3

◆Type, class, material code

Type Class Material code
NK LR DNV BV ABS KR GL CCS CR
Mild steel Grade A steel

KA

A

NV A

A

A

A

GL-A

A

A

Grade B steel

KB

B

NV B

B

B

B

GL-B

B

B

Grade D steel

KD

D

NV D

D

D

D

GL-D

D

D

Grade E steel

KE

E

-

E

E

E

-

E

E

High tensile
strength steel
32-kg grade
steel

KA32
KD32
KE32

AH32
DH32
EH32

NV A32
NV D32
 

AH32
DH32
EH32

AH32
DH32
EH32

AH32
DH32
EH32

GL-A32
GL-D32
 

AH32
DH32
EH32

AH32
DH32
EH32

36-kg grade
steel

KA36
KD36
KE36

AH36
DH36
EH36

NV A36
NV D36
 

AH36
DH36
EH36

AH36
DH36
EH36

AH36
DH36
EH36

GL-A36
GL-D36
 

AH36
DH36
EH36

AH36
DH36
EH36

◆Chemical composition

Type Material
code
Deoxidization Chemical composition (%)
C Si Mn P S Cu
Mild steel KA

Killed

0.21
or lower

0.50
or lower

2.5×C
or higher

0.035
or lower

0.035
or lower

-

KB

0.21
or lower

 

0.35
or lower

0.80
or higher

KD

0.60
or higher

KE

Fine grain killed

0.18
or lower

0.70
or lower

High tensile
strength stee
KA32

Fine grain killed

0.18
or lower

0.50
or lower

0.90~1.60

0.035
or lower

0.035
or lower

0.35
or lower

KD32
KE32
KA36
KD36
KE36
Type Material
code
Deoxidization Chemical composition (%) Carbon
equivalent (%)
Cr Ni Mo T・AL Nb V Ti
Mild steel KA

Killed

-

-

-

-

-

-

-

-

KB
KD
KE

Fine grain
killed

0.020
or higher

High tensile
strength stee
KA32

Fine grain
killed

0.20
or lower

0.40
or lower

0.080
or lower

0.020
or higher

0.020~0.050 0.050~0.100 0.020
or lower
0.36
or lower
KD32
KE32
KA36
KD36
KE36

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