Flat Bulb Steel for Ship Building, Alloy Steel Plates, Mumbai, India

Flat-bulb Steel for Ship Building: Purchasing Specification

Requirement	What to specify
Grade and society	State the steel grade (for example A, B, D, E, AH32, DH32, EH32, FH32 or AH36) and the classification society that will certify it.
Size	Plate thickness × width × length, or section size (for example a bulb flat, flat bar or angle designation), in mm; number of pieces or total weight.
Condition	Supply condition as required (as rolled, controlled rolled, TMCP or normalised) and Z-quality (Z15, Z25 or Z35) if through-thickness properties are needed.
Surface	Blast cleaning to Sa 2.5 and shop primer of 15–35 µm, if required, as the plate page lists.
Marking	Manufacturer, heat and batch number, grade, size and the classification society stamp.
Documents	Mill test certificate and society certificate, with impact test results where the grade requires them.

Flat-Bulb Steel Sizes and Weights

type	size(mm)					CSA (cm2)	weight (kg/m)	allowable deviation (mm)
type	b	t	h	rl	r	CSA (cm2)	weight (kg/m)	b	t	h
80×5 80×6	80	5	19	4	≤1.5	5.41	4.25	±1.5	+0.7 -0.3	±0.5
80×5 80×6	80	6	20	4	≤2	6.21	4.88
100×7 100×8	100	7	22.5	4.5	≤2	8.74	6.86
100×7 100×8	100	8	23.5	4.5	≤2	9.74	7.65
120×6 120×7 120×8	120	6	23	5	≤2	9.32	7.32
		7	24			10.52	8.26
		8	25			11.72	9.20
140×7 140×8 140×10	140	7	26	5.5	≤2	12.43	9.75	±2.0	+1.0 -0.3	±0.8
		8	27		≤2	13.83	10.85
		10	29		≤3	16.63	13.05
160×7 160×8 160×9 160×11	160	7	29	6	≤2	14.60	11.46
		8	30			16.20	12.72
		9	31			17.80	13.97
		11	33		≤3	21.00	16.49
180×8 180×9 180×10 180×11	180	8	33	7	≤2	18.86	14.80
		9	34		≤2	20.66	16.22
		10	35		≤3	22.46	17.63
		11	36		≤3	24.26	19.04
200×9 200×10 200×11 200×12	200	9	37	8	≤2	23.66	18.57	±3.0	+1.1 -0.3	±0.95
		10	38		≤3	25.66	20.14
		11	39			27.66	21.71
		12	40			29.66	23.28
220×10 220×11 220×12	220	10	41	9	≤3	29.66	22.27
		11	42			29.00	24.50
		12	43			31.20	26.22
240×10 240×11 240×12	240	10	40	10	≤3	33.49	25.50
		11	45			34.89	27.39
		12	46			37.29	29.27
260×10 260×11 260×12	260	10	47	11	≤3	36.11	28.35
		11	48			38.71	30.39
		12	49			41.31	32.43
280×11 280×12 280×13	280	11	51	12	≤3	42.68	33.50
		12	52			45.48	35.70
		13	53			48.28	37.90
300×11 300×12 300×13	300	11	54	13	≤3	46.78	36.70
		12	55			49.79	39.09
		13	56			52.79	41.44
320×12 320×13 320×14	320	12	58	14	≤3	54.25	42.60	±4.0	+1.3 -0.3	+1.10
		13	59		≤3	57.25	45.09
		14	60		≤4	60.85	47.60
340×12 340×13 340×14	340	12	61	15	≤3	58.84	46.20
		13	62		≤3	62.24	48.86
		14	63		≤4	65.54	51.50
370×13 370×14 370×15	370	13	66.5	16.5	≤3	69.70	54.70
		14	67.5		≤4	73.40	57.60
		15	68.5		≤4	77.10	60.50
400×14 400×15 400×16	400	14	72	18	≤4	81.48	63.96
		15	73			85.48	67.10
		16	74			89.48	70.20
430×14 430×15 430×17 430×19 430×20	430	14	76.5	19.5	≤4	89.70	70.60
		15	77.5			94.19	73.90
		17	79.5			102.79	80.70
		19	81.5			111.39	87.40
		20	82.5			115.00	90.80

Reading the table: CSA is the cross-sectional area in cm². The letters b, t, h and r are the dimensions of the section (width or height, thickness, bulb height and radii); the page does not include the sketch, so confirm them against the standard your drawing cites. The “≤” entries under the radius columns are maximum radii, and “±” entries are allowable deviations in mm. Sizes are written as height × thickness.

How the Four Ship Building Pages Differ

The four pages cover steel for ship building and oil platforms: classified plate in one page and three rolled section types, bulb flats, flat bars and angles, in the others. The plate page lists the grades by classification society; the section pages give size, weight and tolerance tables.

Page	What it covers	Product form
PLATE	Plate sizes, standards and the classification society grade table	Plate, 3–180 mm thick
FLAT BULB (this page)	Bulb-flat size table with area, weight and allowable deviation	Section, 80 × 5 up to 430 × 20
FLAT BAR	Flat-bar size table with area, weight and allowable deviation	Section, 8 × 100 up to 30 × 450
ANGLE	Angle size table with section area and weight, and JIS G3192 tolerances	Section, L200 × 90 and larger

State the grade, classification society and size on your enquiry; section sizes are listed as designations on the pages.

Related plates in this range

Applications for Flat-bulb Steel for Ship Building

Typical uses include ship hulls and decks, oil platforms, and ship stiffeners and framing such as bulb flats, flat bars and angles. Tell us the load, temperature and service conditions so the right grade and thickness can be quoted.

Cutting, Fabrication and Welding

Champak Industries describes full and part plate/profile supply and a plasma-cutting service. Send drawings, quantities, tolerances and edge preparation for your parts. Shipbuilding plate and sections can be cut to size and shape to your drawings through our plasma-cutting and cutting services. Send the grade, society, size and quantity. Weld with consumables and a procedure approved by the classification society.

Testing, Inspection Documents and Traceability

Requirement	What to identify in the order
Classification certificate	Society (ABS, BV, DNV, GL, KR, LR, NK or RINA, as the plate page lists) and certificate type
Mill test certificate	EN 10204 3.1 showing grade, heat number, chemistry and mechanical properties
Impact test	Charpy temperature and energy for the grade (A, B, D, E and the AH, DH, EH and FH grades)
Z-quality	Z15, Z25 or Z35 through-thickness test, if required
Traceability	Heat number and plate number marked on the material

See the company’s Quality Policy for its published policy.

Source Flat-bulb Steel for Ship Building from Champak Industries

Champak Industries’ company profile records its establishment in Mumbai in 1978 and its stockist, import and export activities. Flat-bulb Steel for Ship Building can be requested together with other plates in the Ship Building Plates Lloyds A range.

What Determines the Quotation?

Grade and brand, thickness, plate size, quantity, cutting, testing and packing all affect the quotation. Say whether pricing is needed per kilogram, per plate or per finished piece.

Packing, Dispatch and Export Requirements

Give the delivery address, required date and unloading constraints. For export orders, include the destination port, delivery terms and document list.

WANT TO KNOW MORE?

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0982 0944 724

Flat-bulb Steel for Ship Building: Frequently Asked Questions

What is Flat-bulb Steel for Ship Building?

Flat-bulb steel for ship building is listed in sizes from 80 × 5 up to 430 × 20, with a table of section dimensions, cross-sectional area, weight per metre and allowable deviation.

Which sizes does the page list?

Bulb flats from 80 × 5 up to 430 × 20 mm, with several thicknesses for each height, for example 120 × 6, 7 and 8.

What does the table give for each size?

The section dimensions, cross-sectional area (cm²), weight per metre (kg/m) and the allowable deviation for each dimension.

Which standard applies?

The page names no standard; state the standard and classification society on your enquiry.

Can Flat-bulb steel be welded?

Yes; shipbuilding steels are made for welded construction. Use consumables and a procedure approved by the classification society, and follow the mill’s preheat advice for the grade and thickness.

Which certificate should I request?

A mill test certificate (EN 10204 3.1) plus the classification society certificate, showing the grade, heat number, chemistry and mechanical properties and any impact test results.

Can another grade replace Flat-bulb steel?

Shipbuilding grades are approved by classification societies; substitutions need the society’s agreement, so confirm any change with your surveyor or the society.

Can Flat-bulb steel be cut to size?

Yes. Champak Industries lists a plasma-cutting service; send drawings, quantities and tolerances with your enquiry.

Which sizes are available?

Availability depends on the grade, society and size; send the size you need and it will be confirmed at quotation.

How do I get a price and delivery date?

Send the grade and society, size, quantity, destination and required date through the enquiry form below, by WhatsApp or by phone.

Flat-bulb Steel for Ship Building