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Bulb flat steels
Hot rolled bulb flat steel bar

Hot rolled Bulb flat steel bar is mainly used in shipbuilding and bridge-building. It is the auxiliary medium section steel for shipbuilding. Shipbuilding Hot rolled Bulb flat bar has common tensile strength material, like Grade A and B, High Tensile strength material like Grade AH32 and AH36. The size of bulb flat bar we can supply is : 80 × 5/6, 100 × 7/8, 120 × 6/7/8, 140 × 7/8/10, 160 × 7/8/9/11, 180 × 8/9/10/11, 200 × 9/10/1112, 220 × 10/11/12, 240 × 10/11/12, 260 × 10/11/12, 280 × 11/12/13, 300 × 11/12/13, 320 × 12/13/14, 340 × 12/13/14, 370 × 13/14/15, 400 × 14/15/16, 430 × 14/15/17/19/20

Products list:

NK Grade A

LR Grade A

RINA Grade A

ABS Grade A

NK grade D

NK Grade B

LR Grade B

RINA Grade B

ABS Grade B

NK DH36

NK Grade AH32

LR AH32

RINA AH32

ABS AH32

LR/DH32

NK Grade AH36

LR AH36

RINA AH36

ABS AH36

NV/D

BV Grade A

GL Grade A

KR Grade A

DNV Grade A

NV D36

BV Grade B

GL Grade B

KR Grade B

DNV Grade B

AB/DH32

BV AH32

GL AH32

KR AH32

DNV AH32

BV/D

BV AH36

GL AH36

KR AH36

DNV AH36

BV/DH36

KR D32

KR D36

RI/D

RI/D32

RI/D36

GL-D32

GL-D36

NK DH32

LR/D

LR/DH36

NV D32

AB/D

AB/DH36

BV/DH32

KR D

GL-A

 

 

 

 

Hot rolled bulb flats(GB/T9945-2012)

Type

Nominal dimensions (mm)

Sectional area
(cm2)

Mass/Unit length
(kg/m)

b

t

h

r1

r

HP80×5

80

5

19

4

≤1.5

5.41

4.25

HP80×6

80

6

20

4

≤2

6.21

4.88

HP100×7

100

7

22.5

4.5

≤2

8.74

6.86

HP100×8

100

8

23.5

4.5

≤2

9.74

7.65

HP120×6

120

6

23

5

≤2

9.32

7.32

HP120×7

120

7

24

5

≤2

10.52

8.26

HP120×8

120

8

25

5

≤2

11.72

9.20

HP140×7

140

7

26

5.5

≤2

14.43

9.75

HP140×8

140

8

27

5.5

≤2

12.83

10.85

HP140×9

140

9

28

5.5

≤2

15.20

11.93

HP140×10

140

10

29

5.5

≤3

16.63

13.05

HP160×7

160

7

29

6

≤2

14.60

11.46

HP160×8

160

8

30

6

≤2

16.20

12.72

HP160×9

160

9

31

6

≤2

17.80

13.97

HP160×11

160

11

33

6

≤3

21.00

16.49

HP180×8

180

8

33

7

≤2

18.86

14.80

HP180×9

180

9

34

7

≤2

20.66

16.22

HP180×10

180

10

35

7

≤3

22.46

17.63

HP180×11

180

11

36

7

≤3

24.26

19.04

HP200×9

200

9

37

8

≤2

23.66

18.57

HP200×10

200

10

38

8

≤3

25.66

20.14

HP200×11

200

11

39

8

≤3

27.66

21.71

HP200×12

200

12

40

8

≤3

29.66

23.28

HP220×10

220

10

41

9

≤3

29

22.77

HP220×11

220

11

42

9

≤3

31.20

24.50

HP220×12

220

12

43

9

≤3

33.40

26.22

HP240×10

240

10

44

10

≤3

32.49

25.50

HP240×11

240

11

45

10

≤3

34.89

27.39

HP240×12

240

12

46

10

≤3

37.29

29.27

HP260×10

260

10

47

11

≤3

36.11

28.35

HP260×11

260

11

48

11

≤3

38.71

30.39

HP206×12

260

12

49

11

≤3

41.31

32.43

HP260×13

260

13

50

11

≤3

43.85

34.43

HP280×11

280

11

51

12

≤3

42.68

33.50

HP280×12

280

12

52

12

≤3

45.48

35.70

HP280×13

280

13

53

12

≤3

48.28

37.90

HP300×11

300

11

54

13

≤3

46.78

36.70

HP300×12

300

12

55

13

≤3

49.79

39.09

HP300×13

300

13

56

13

≤3

52.79

41.44

HP320×12

320

12

58

14

≤3

54.25

42.60

HP320×13

320

13

59

14

≤3

57.25

45.09

HP320×14

320

14

60

14

≤4

60.85

47.60

HP340×12

340

12

61

15

≤3

58.84

46.20

HP340×13

340

13

62

15

≤3

62.24

48.86

HP340×14

340

14

63

15

≤4

65.54

51.50

HP370×13

370

13

66.5

16.5

≤3

69.70

54.70

HP370×14

370

14

67.5

16.5

≤4

73.40

57.60

HP370×15

370

15

68.5

16.5

≤4

77.10

60.50

HP400×14

400

14

72

18

≤4

81.48

63.96

HP400×15

400

15

73

18

≤4

85.48

67.10

HP400×16

400

16

74

18

≤4

89.48

70.20

HP430×14

430

14

76.5

19.5

≤4

89.70

70.60

HP430×15

430

15

77.5

19.5

≤4

94.19

73.90

HP430×17

430

17

79.5

19.5

≤4

102.79

80.70

HP430×19

430

19

81.5

19.5

≤4

111.39

87.40

HP430×20

430

20

82.5

19.5

≤4

115.00

90.80

Notes: please inquire us for special requirements of thickness.

Bulb flats of old national standard(GB/T9945-2001)

Type

Nominal dimensions (mm)

Sectional area
(cm2)

Mass/Unit length
(kg/m)

b

t

h

r1

r

80×5l Ⅱ

80

5

22

4

≤1.5

5.86

4.61

90×5.5Ⅱ

90

5.5

24

4

≤1.5

7.06

5.55

100×6Ⅱ

100

6

26

5

≤1.5

8.66

6.81

120×6.5Ⅱ

120

6.5

30

5

≤2

11.18

8.78

140×7Ⅱ

140

7

33

6

≤2

14.12

11.10

140×9Ⅱ

140

9

35

6

≤2

16.91

13.30

220×11Ⅱ

220

11

48

8.5

≤3

32.90

25.87

220×13Ⅱ

220

13

50

8.5

≤3

37.30

29.33

240×12Ⅱ

240

12

52

9

≤3

38.87

30.55

204×14Ⅱ

240

14

54

9

≤3

43.67

34.32

270×12Ⅱ

270

12

55

9.5

≤3

43.93

34.53

270×14Ⅱ

270

14

57

9.5

≤3

49.33

38.77

Notes: please inquire us for special requirements of thickness.

Dimension Tolerances of bulb flat

Nominal dimensions (mm)

Tolerances of products (mm)

b

t

h

b

t

h

80

120

5~8

19~30

±1.5

+0.7
-0.3

±0.5

120

180

6~11

26~38

±2.0

+1.0
-0.3

±0.8

180

300

8~14

37~57

±3.0

+1.1
-0.3

±0.95

300

400

11~20

58~8205

±4.0

+1.3
-0.3

±1.1

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