Bulb Flat

Bulb Flat is a unique steel profile widely recognized in the shipbuilding industry for its ability to deliver strength, stability, and efficiency in demanding environments. The bulb-like edge provides greater resistance against buckling compared to flat bars, while reducing weight and saving material costs. Engineers, shipbuilders, and steel buyers consider Bulb Flat Steel as one of the essential products in naval and offshore projects.

What is Bulb Flat Steel?

Bulb Flat Steel is a rolled steel product with a flat body and a small “bulb” along one edge. This shape provides superior structural strength, making it highly effective in shipbuilding and marine applications. Compared to traditional flat bars, Bulb Flat Bar offers improved stiffness and reduced welding time due to its design.

The Bulb Flat Section is used as a stiffener in ship hulls, decks, and offshore structures, ensuring greater resistance to stress and improving safety standards. In addition, the Bulb Flat Profile is manufactured in various steel grades such as S235, S275, and S355 to meet international shipbuilding standards.

Bulb Flat Sizes, Bulb Flat Dimensions, Bulb Flat Weight Chart

	b	t	c	r	Kesit	Metrik	Yüzey	dx	lxx	Wxx
Ölçü	(mm)	(mm)	(mm)	(mm)	(cm²)	Ağırlık	Alanı	(cm)	(cm4)	(cm³)
						(kg/m)	(m²/m)
60 x 4	60 ±1,5	4 +0,7 / -0,3	13	3,5	3,58	2,81	0.146	3,82	12,2	3,2
60 x 5	60 ±1,5	5 +0,7 / -0,3	13	3,5	4,18	3,28	0.148	3,7	14,4	3,89
60 x 6	60 ±1,5	6 +0,7 / -0,3	13	3,5	4,78	3,75	0.150	3,62	16,4	4,55
80 x 5	80 ±1,5	5 +0,7 / -0,3	14	4	5,41	4,25	0.189	4,9	33,87	6,91
80 x 6	80 ±1,5	6 +0,7 / -0,3	14	4	6,21	4,88	0.191	4,78	38,7	8,15
80 x 7	80 ±1,5	7 +0,7 / -0,3	14	4	7	5,5	0.194	4,69	43,3	9,24
80 x 8	80 ±1,5	8 +0,7 / -0,3	14	4	7,8	6,12	0.196	4,62	48	10,39
100 x 6	100 ±1,5	6 +0,7 / -0,3	15,5	4,5	7,74	6,08	0.234	5,98	76,1	12,7
100 x 7	100 ±1,5	7 +0,7 / -0,3	15,5	4,5	8,74	6,86	0.236	5,87	85,3	14,5
100 x 8	100 ±1,5	8 +0,7 / -0,3	15,5	4,5	9,74	7,65	0.238	5,78	94,3	16,3
120 x 6	120 ±1,5	6 +0,7 / -0,3	17	5	9,32	7,32	0.276	7,21	133	18,5
120 x 7	120 ±1,5	7 +0,7 / -0,3	17	5	10,52	8,26	0.278	7,07	149	21
120 x 8	120 ±1,5	8 +0,7 / -0,3	17	5	11,72	9,2	0.280	6,96	165	23,6
140 x 7	140 ±2	7 +1 / -0,3	19	5,5	12,43	9,75	0.320	8,32	241	29
140 x 8	140 ±2	8 +1 / -0,3	19	5,5	13,83	10,85	0.322	8,18	266	32,5
140 x 9	140 ±2	9 +1 / -0,3	19	5,5	15,2	11,9	0.324	8,07	291	36
160 x 7	160 ±2	7 +1 / -0,3	22	6	14,6	11,46	0.365	9,55	373	38,6
160 x 8	160 ±2	8 +1 / -0,3	22	6	16,2	12,72	0.367	9,5	411	43,9
160 x 9	160 ±2	9 +1 / -0,3	22	6	17,8	13,97	0.369	9,37	449	47,9
180 x 8	180 ±2	8 +1 / -0,3	25	7	18,86	14,8	0.411	10,89	609	55,9
180 x 9	180 ±2	9 +1 / -0,3	25	7	20,86	16,22	0.413	10,73	664	61,8
180 x 10	180 ±2	10 +1 / -0,3	25	7	22,46	17,63	0.415	10,59	717	67,7
180 x 11	180 ±2	11 +1 / -0,3	25	7	24,26	19,04	0.417	10,47	770	73,5
200 x 9	200 ±3	9 +1 / -0,4	28	8	23,66	18,57	0.457	12,12	942	77,7
200 x 10	200 ±3	10 +1 / -0,4	28	8	25,66	20,14	0.459	11,96	1017	85,1
200 x 11	200 ±3	11 +1 / -0,4	28	8	27,66	21,71	0.461	11,82	1091	92,3
200 x 12	200 ±3	12 +1 / -0,4	28	8	29,66	23,28	0.463	11,69	1164	99,5
220 x 10	220 ±3	10 +1 / -0,4	31	9	29	22,77	0.503	13,35	1396	105
220 x 11	220 ±3	11 +1 / -0,4	31	9	31,2	24,5	0.506	13,19	1496	114
220 x 12	220 ±3	12 +1 / -0,4	31	9	33,4	26,22	0.507	13,04	1595	122
240 x 10	240 ±3	10 +1 / -0,4	34	10	32,49	25,5	0.547	14,77	1865	126
240 x 11	240 ±3	11 +1 / -0,4	34	10	34,89	27,39	0.549	14,58	1997	137
240 x 12	240 ±3	12 +1 / -0,4	34	10	37,29	29,27	0.551	14,42	2127	148
260 x 10	260 ±3	10 +1 / -0,4	37	11	36,11	28,35	0.591	16,22	2434	150
260 x 11	260 ±3	11 +1 / -0,4	37	11	38,71	30,39	0.593	16	2605	163
260 x 12	260 ±3	12 +1 / -0,4	37	11	41,31	32,43	0.595	15,81	2774	175
280 x 11	280 ±3	11 +1 / -0,4	40	12	42,68	33,5	0.637	17,44	3333	191
280 x 12	280 ±3	12 +1 / -0,4	40	12	45,48	35,7	0.639	17,23	3647	206
280 x 13	280 ±3	13 +1 / -0,4	40	12	48,28	37,9	0.641	17,04	3757	221
300 x 11	300 ±3	11 +1,2 / -0,4	43	13	46,78	36,7	0.681	18,9	4192	222
300 x 12	300 ±3	12 +1,2 / -0,4	43	13	49,79	39,09	0.683	18,7	4459	239
300 x 13	300 ±3	13 +1,2 / -0,4	43	13	52,79	41,44	0.685	18,45	4722	256
320 x 12	320 ±4	12 +1,2 / -0,4	46	14	54,25	42,6	0.728	20,12	5525	275
320 x 13	320 ±4	13 +1,2 / -0,4	46	14	57,45	45,09	0,73	19,89	5849	294
320 x 14	320 ±4	14 +1,2 / -0,4	46	14	60,85	47,6	0.732	19,68	6168	313
340 x 12	340 ±4	12 +1,2 / -0,4	49	15	58,84	46,2	0.772	21,69	6,757	313
340 x 13	340 ±4	13 +1,2 / -0,4	49	15	62,24	48,86	0.774	21,34	7,152	335
340 x 14	340 ±4	14 +1,2 / -0,4	49	15	65,54	51,5	0.776	21,1	7,54	357
370 x 13	370 ±4	13 +1,2 / -0,4	53,5	16,5	69,7	54,7	0.840	23,54	9,469	402
370 x 14	370 ±4	14 +1,2 / -0,4	53,5	16,5	73,4	57,6	0.842	23,29	9,98	429
370 x 15	370 ±4	15 +1,2 / -0,4	53,5	16,5	77,1	60,5	0.844	23,06	10,483	456
400 x 14	400 ±4	14 +1,2 / -0,4	58	18	81,48	63,96	0.908	25,49	12,924	507
400 x 15	400 ±4	15 +1,2 / -0,4	58	18	85,48	67,1	0.910	25,24	13,573	538
400 x 16	400 ±4	16 +1,2 / -0,4	58	18	89,48	70,2	0.912	25	14,211	568
430 x 14	430 ±4	14 +1,2 / -0,4	62,5	19,5	89,7	70,6	0.975	27,7	16,46	594
430 x 15	430 ±4	15 +1,2 / -0,4	62,5	19,5	94,19	73,9	0.976	27,46	17,249	629
430 x 17	430 ±4	17 +1,2 / -0,4	62,5	19,5	102,79	80,7	0.980	26,95	18,853	700
430 x 19	430 ±4	19 +1,2 / -0,4	62,5	19,5	111,39	87,4	0.984	26,53	20,413	770
430 x 20	430 ±4	20 +1,2 / -0,4	62,5	19,5	115	90,8	0.986	26,3	21,18	804

Bulb Flat Standard

Every Bulb Flat Standard follows specific international norms to guarantee performance and safety. Common standards include:

EN 10025 (Europe) – S235, S275, S355 grades
ASTM A36 / A572 (USA) – commonly used in global shipbuilding projects
JIS SS400 / SM490 (Japan) – widely used in Asian shipyards

Compliance with classification societies such as DNV, ABS, BV, and LR is also essential in ensuring that Bulb Flat for Shipbuilding meets maritime regulations.

Bulb Flat for Shipbuilding

Bulb Flat for Shipbuilding is an integral component of naval construction. It is primarily used for hull reinforcement, stiffeners in decks, bulkheads, and internal structural framing. Shipyards value its efficiency, as Shipbuilding Bulb Flat reduces welding time and material consumption compared to standard flat bars.

The marine environment demands products that are both durable and resistant to corrosion. That is why Marine Bulb Flat is often delivered with additional treatments such as shot blasting, priming, or galvanizing, extending the lifespan of vessels and offshore structures.

Marine Bulb Flat and Shipbuilding Bulb Flat

The terms Marine Bulb Flat and Shipbuilding Bulb Flat are often used interchangeably, but both highlight the same application – reinforcement of ship structures. Offshore platforms, ports, and coastal facilities also rely on these products for their durability and cost-effectiveness.

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Commercial Perspective – Suppliers and Manufacturers

Working with a reliable Bulb Flat Steel Supplier or certified Bulb Flat Steel Manufacturer is critical for securing quality products. Suppliers provide a wide range of sizes and ensure conformity with the required standard.

Key benefits of selecting an experienced supplier include:

Access to international stock
Technical support and documentation
Certifications for quality assurance
On-time delivery for global projects

Bulb Flat Price

The Bulb Flat Price depends on several factors:

Steel grade (S235, S275, S355)
Dimensions and sizes
Surface treatment (as-rolled, painted, galvanized)
Quantity and order volume
Delivery terms (EXW, FOB, CIF)

Bulk orders often come with discounts, while special treatments may increase the cost. Reliable suppliers offer transparent pricing that includes all elements defined in the specification.

Bulb Flat Specification

The Bulb Flat Specification is a technical document detailing the product’s chemical composition, mechanical properties, dimensional tolerances, and surface conditions. It ensures compliance with international standards and provides classification approvals required by shipbuilding authorities.

Key information in a specification includes:

Yield strength and tensile strength
Elongation percentage
Thickness and width tolerances
Surface quality and finish options
Certification according to EN 10204 (3.1 / 3.2)

By following the specification, engineers and procurement managers can confidently select the right product for their projects.

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Conclusion

From Bulb Flat Steel to Bulb Flat Bar, Bulb Flat Section, and Bulb Flat Profile, this product group is essential in shipbuilding and marine engineering. Understanding Bulb Flat Sizes, Bulb Flat Dimensions, and consulting the Bulb Flat Weight Chart helps optimize projects. Ensuring compliance with the correct Bulb Flat Standard and reviewing the Bulb Flat Specification provides confidence in performance and safety.

Commercially, partnering with the right Bulb Flat Steel Supplier or Bulb Flat Steel Manufacturer guarantees quality and availability. With modern procurement channels, it is easier than ever to Buy Bulb Flat Online and secure competitive Bulb Flat Price options for global delivery. In summary, Bulb Steel Flat is more than just a steel profile – it is a cornerstone of shipbuilding efficiency, marine safety, and structural reliability.

This article explores everything about Bulb Flat Steel, including Bulb Flat Bar, Bulb Flat Section, Bulb Flat Profile, along with details on Bulb Flat Sizes, Bulb Flat Dimensions, Bulb Flat Weight Chart, Bulb Flat Standard, and Specification. It also provides commercial insights about Bulb Flat Steel Supplier, global availability to factors influencing Bulb Flat Price.

Shipbuilding Steel Plates | Marine Grades AH36, DH36, EH36

Shipbuilding Steel Plates: Overview

Shipbuilding Steel Plates—also called marine steel plates—are engineered for hulls, decks, bulkheads, and offshore structures where strength, toughness, and corrosion resistance are critical. Their balanced chemistry and controlled rolling deliver reliable weldability and consistent performance in demanding marine environments.

Key Properties

High Mechanical Strength

Modern grades deliver high yield-to-weight ratios, improving payload capacity while maintaining structural integrity.

Impact Toughness

Designed to resist brittle fracture at low service temperatures—essential for Arctic routes and cold seawater exposure.

Corrosion & Coating Compatibility

Optimized for marine coatings, primers, and optional shot-blast & shop-primer finishes for faster fabrication.

Weldability & Formability

Controlled carbon equivalent supports efficient cutting, bending, and welding with reduced preheat requirements.

Grades & Standards

Classification Societies

Plates are certified by international bodies, including ABS, LR, DNV, BV, RINA, and CCS to ensure compliance with ship design rules.

Common Strength Levels

Typical higher-strength marine grades include AH36, DH36, EH36, and FH36, selected according to location in the vessel, design loads, and service temperature profile.

Optional Requirements

Ultrasonic testing (UT) for internal soundness
Z-direction properties (e.g., Z25/Z35) for through-thickness performance
Charpy impact testing at specified temperatures
Shot-blasting & shop-priming for immediate weld-line readiness

Applications

Hull structures of bulk carriers, tankers, containers, RO-RO and LNG vessels
Decks, bulkheads, stringers, and longitudinal frames
Offshore platforms, jackets, topsides, and subsea support structures
Naval and coast-guard craft requiring robust, weight-efficient plate solutions

Dimensions & Customization

Standard Size Range

Thickness: ~4–200 mm (project-dependent)
Width: up to ~4000 mm
Length: up to ~20,000 mm

Processing Options

Cut-to-length, beveling, drilling, and edge preparation
Flattening and heat-treatment options per project spec
Marking & traceability to mill heat and certificate

Quality Documentation

MTR/EN 10204 3.1 or 3.2 certificates, society stamps, and test reports accompany each delivery.

Commercial Perspective

Supply & Lead Times

Global availability from mills and service centers enables a mix of ex-stock and mill orders. Lead times depend on grade, thickness, certification queue, and finishing requirements.

Price Drivers

Raw materials and energy costs
Exchange rates and freight/logistics
Certification scope (ABS/LR/DNV/BV/RINA/CCS)
Thickness/width rarity and MOQ constraints
Additional tests (UT, Z-properties) and shop-priming

Buyer Tips

Request dual or multi-society approval when multi-yard use is possible
Align plate sizes with nesting plans to reduce scrap
Book UT/Z-properties early for critical joints

Why Choose Us

Certified Inventory

Wide range of AH36/DH36/EH36 with leading society approvals, ready for rapid dispatch.

Technical Support

Application engineering for grade selection, welding procedures, and coating compatibility.

Global Logistics

Sea, road, and multimodal options with export documentation and customs support.

Conclusion

Shipbuilding Steel Plates remain the backbone of safe, efficient marine structures. With certified grades, robust properties, and tailored processing, they empower shipyards and offshore projects to meet modern performance targets while controlling weight, cost, and risk.

Shipbuilding Steel Plates — Technical Table

Grade	Classification Approvals	Yield Strength ReH (MPa) (typical min, t ≤ 50 mm)	Tensile Strength Rm (MPa)	Elongation A5 (%)	Impact Toughness (Charpy V)	Delivery Condition	Typical Thickness Range (mm)	Typical Uses	Weldability Typical CE_Q (max)
A / B (Normal Strength)	ABS, LR, DNV, BV, RINA, CCS	≥ 235	400 – 520	≥ 22	≥ 27 J @ 0 °C (L)	AR / N / TMCP	4 – 50	Hull plating, decks, bulkheads	≤ 0.35
D (Normal Strength)	ABS, LR, DNV, BV, RINA, CCS	≥ 235	400 – 520	≥ 22	≥ 27 J @ −20 °C (L)	N / TMCP	6 – 80	Cold-service areas, frames	≤ 0.35
E (Normal Strength)	ABS, LR, DNV, BV, RINA, CCS	≥ 235	400 – 520	≥ 22	≥ 27 J @ −40 °C (L)	N / TMCP	6 – 80	Low-temperature zones, stringers	≤ 0.36
AH36 (Higher Strength)	ABS, LR, DNV, BV, RINA, CCS	≥ 355	490 – 620	≥ 21	≥ 34 J @ 0 °C (L)	N / TMCP	6 – 120	Primary hull, decks, heavy scantlings	≤ 0.40
DH36 (Higher Strength)	ABS, LR, DNV, BV, RINA, CCS	≥ 355	490 – 620	≥ 21	≥ 34 J @ −20 °C (L)	TMCP / N	8 – 150	Cold-route hulls, longitudinals	≤ 0.42
EH36 (Higher Strength)	ABS, LR, DNV, BV, RINA, CCS	≥ 355	490 – 620	≥ 21	≥ 34 J @ −40 °C (L)	TMCP	8 – 150	Arctic service, critical joints	≤ 0.43
FH36 (Higher Strength)	ABS, LR, DNV, BV, RINA, CCS	≥ 355	490 – 620	≥ 20	≥ 34 J @ −60 °C (L)	TMCP	10 – 120	Extreme low-temp structures	≤ 0.43

Dimensions, Processing, and QA Options

Parameter	Typical Capability / Option	Notes
Plate Width	Up to ~4000 mm	Project-specific wider widths on request
Plate Length	Up to ~20,000 mm	Cut-to-length for nesting optimization
Surface Preparation	Shot-blasted & Shop-Primed (Sa 2.5)	Typical primer 15–25 μm; weld-line ready
UT (Ultrasonic Testing)	EN 10160 S1/E1, S2/E2	Higher classes for critical zones
Through-Thickness (Z properties)	Z15 / Z25 / Z35	For thickness transitions & high triaxial stress
Dimensional Tolerances	EN 10029 Class N (or per society)	Flatness/rectangularity per PO
Edge & Bevel	Mill edge / flame-cut; V/Y bevels	Prepared to WPS requirements
Certificates	EN 10204 3.1 / 3.2 + Society Stamp	ABS / LR / DNV / BV / RINA / CCS
Heat Treatment	N (Normalized), TMCP	Choose TMCP for strength + low CE_Q
Traceability	Heat-numbered plates, barcode labels	Full batch trace, MTR linkage

Notes: Values shown are typical minima/availability ranges used in international practice. Final acceptance criteria, impact test temperatures/energy, delivery condition, and tolerances must follow the applicable classification society rules and the project specification/Purchase Order.

Bulb Flat

Bulb Flat

What is Bulb Flat Steel?

Bulb Flat Sizes, Bulb Flat Dimensions, Bulb Flat Weight Chart

Bulb Flat Standard

Bulb Flat for Shipbuilding

Marine Bulb Flat and Shipbuilding Bulb Flat

Click Here for Steel Sheets

Commercial Perspective – Suppliers and Manufacturers

Bulb Flat Price

Bulb Flat Specification

Click Here for Our Steel Service Center Services

Conclusion

Shipbuilding Steel Plates: Overview

Key Properties

High Mechanical Strength

Impact Toughness

Corrosion & Coating Compatibility

Weldability & Formability

Grades & Standards

Classification Societies

Common Strength Levels

Optional Requirements

Applications

Dimensions & Customization

Standard Size Range

Processing Options

Quality Documentation

Commercial Perspective

Supply & Lead Times

Price Drivers

Buyer Tips

Why Choose Us

Certified Inventory

Technical Support

Global Logistics

Conclusion

Shipbuilding Steel Plates — Technical Table

Dimensions, Processing, and QA Options

HL Metal Demir Çelik Sanayi