Rolled Steel for Shipbuilding (Inverted Angles)｜Heavy-duty Machined Products｜Products

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

Standard cross-section dimensions（mm）

Cross-sectional area

Unit mass

A×B

t₁

t₂

r₁

r₂

（cm²）

（kg/m）

200×90

27.80

29.66

21.8

23.3

200×91

31.66

24.8

250×90

8.5

34.31

35.12

37.47

40.61

42.95

26.9

27.6

29.4

31.9

33.7

300×90

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
Type	Class	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
High tensile strength steel	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 (%)
Type	Material code	Deoxidization	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		0.21 or lower		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 (%)
Type	Material code	Deoxidization	Cr	Ni	Mo	T・AL	Nb	V	Ti	Carbon equivalent (%)
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