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LR Grade DH32 Shipbuilding Steel Plate - High-Strength Marine Structural Steel

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LR Grade DH32 shipbuilding steel plate is a high-quality, low-temperature-resistant, high-strength structural steel plate certified by Lloyd’s Register (LR). It is widely used in shipbuilding and offshore engineering applications that require low-temperature resistance and stable structural performance. We supply LR Grade DH32 shipbuilding steel plates in a full range of specifications, accompanied by complete LR certification and factory test certificates. Upon request, we can also provide dual or multiple certifications from major classification societies such as CCS, ABS, BV, NK, and DNV.

Certification :
LR Rules
Grade :
LR Grade DH32 (LR DH32)
Thickness :
5.0 - 150.0 mm
Width :
1,500.0 - 4,000.0 mm
Length :
6,000.0 - 18,000.0 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

1. What is LR Grade DH32 shipbuilding steel plate?

LR Grade DH32 shipbuilding steel plates are high-strength hull structural steel plates certified by Lloyd’s Register (LR) for use in low-temperature environments. They feature excellent impact toughness at -20°C, stable high-strength mechanical properties, good weldability and formability, as well as outstanding resistance to seawater corrosion and fatigue.

LR Grade DH32 shipbuilding steel plates effectively resist wave impact, structural fatigue, and low-temperature brittle fracture in complex marine environments. They are widely used in ocean-going vessels, offshore platforms in cold regions, offshore engineering facilities, marine auxiliary structures, and port equipment.

2. Meaning of the Designation

LR: Certified by Lloyd’s Register (LR)

D: Quality grade D (Must meet the requirements of the impact test at -20°C)

H: High strength

32: Minimum yield strength: 315 MPa (≈ 32 kgf/mm²)

Available Specifications and Dimensions

Product Name	LR Grade DH32 Shipbuilding Steel Plate
Certification	LR (Supports dual or multiple certifications from major classification societies such as CCS, ABS, BV, DNV, and NK.)
Grade	LR DH32
Classification	High-Strength Structural Steel for Ship and Ocean Engineering
Thickness	5 - 150 mm
Width	1,500 - 4,000 mm
Length	6,000 - 18,000 mm
Delivery Conditions	Hot Rolled (HR), Thermo-Mechanical Controlled Processed (TMCP), Normalized (N).
Surface Conditions	Original hot-rolled scale, No cracks, scarring, delamination, inclusions, or deep scratches.
Machining Services	Precision cutting, bending, drilling, beveling, surface rust removal, shot blasting, anti-corrosion coating, and customized secondary processing.
Inspection	Charpy V-notch impact test, Ultrasonic testing (UT), Z-direction property test (Grades Z15/Z25/Z35), Third-party test (such as SGS, BV), etc.
Applications	Widely used in the hulls, sides, bottoms, and decks of ocean-going vessels operating in low-temperature environments, as well as in the load-bearing structures of offshore platforms.
MOQ	20 tons (small orders can be negotiated).
Delivery Time	15 - 20 days after order confirmation (urgent orders accepted)
Packaging	Standard export packaging for sea transport, or as required.
Country of origin	China

Chemical Composition

(Heat Analysis, wt %)

Grade	C	Si	Mn	P	S	Cu	Cr	Ni	Nb	V	Ti	Mo	Als
LR DH32	≤ 0.18	≤ 0.50	0.90 - 1.60	≤ 0.025	≤ 0.025	≤ 0.35	≤ 0.20	≤ 0.40	0.02 - 0.05	0.05 - 0.10	≤ 0.02	≤ 0.08	≥ 0.015

Carbon Equivalent

Thickness (mm)	5 - 50	50 - 150
Typical CEV (wt %)	≤ 0.36	≤ 0.38

Calculation formula (IIW): CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15

Mechanical Properties

Grade	Yield Strength (ReH), MPa	Tensile Strength (Rm), MPa	Elongation (A), %
LR DH32	≥ 315	450 - 570	≥ 22

Impact Properties

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
LR DH32	≤ 50	- 20	≥ 31	≥ 22
	> 50 - 70	- 20	≥ 38	≥ 26
	> 70 - 150	- 20	≥ 46	≥ 31

Characteristics and Advantages

1. Authoritative Certification by LR

Officially certified by Lloyd’s Register (LR), this steel fully meets the requirements for global shipyard tenders, offshore engineering project delivery, and cross-border customs clearance, ensuring smooth project acceptance.

2. Stable, High-Strength Mechanical Properties

With stable yield strength and tensile strength, this steel can effectively withstand long-term alternating structural stresses, wave impacts, and seawater pressure in medium-load offshore engineering projects.

3. Excellent Low-Temperature Toughness

It maintains stable impact toughness at -20°C, effectively mitigating the risk of structural brittle fracture in cold waters and low-temperature marine environments.

4. Good Weldability and Workability

It is easy to cut and weld with precision on-site and does not require complex post-weld heat treatment, significantly improving construction efficiency and reducing overall project costs.

5. Reliable Resistance to Marine Corrosion

It combines excellent resistance to seawater corrosion, salt spray aging, and wet-dry cycling, ensuring long-term structural stability and extending service life.

6. Superior Fatigue Resistance

An optimized internal microstructure enhances the structure’s fatigue resistance, effectively reducing the risk of fatigue failure in ships and offshore facilities during long-term operation.

Applications

1. Shipbuilding

Used in critical components of medium- and large-sized ocean-going vessels, bulk carriers, oil tankers, and container ships, including main hull plates, load-bearing decks, reinforced bulkheads, and bottom load-bearing structures.

2. Offshore Engineering

Suitable for oil and gas drilling platforms in temperate and cold waters, offshore wind turbine foundations, hull structures of Floating Production, Storage, and Offloading (FPSO) units, as well as core load-bearing components and support facilities for shallow-water engineering equipment.

3. Port Auxiliary Equipment

Used in critical load-bearing structures of port equipment such as floating cranes, offshore support vessels, and dredgers operating in seasonal low-temperature and cold environments.

4. Ship Repair and Structural Reinforcement

Used for hull structure replacement, localized reinforcement, and safety upgrades for ocean-going vessels and coastal facilities.

FAQ

Q1:

What is the main difference between LR EH32 and LR DH32 marine steel plates?

The key difference between the two lies in their low-temperature impact toughness ratings.

LR EH32: Requires impact toughness at -40°C, offers excellent resistance to brittle fracture, and is suitable for polar and extremely cold marine environments;

LR DH32: Requires impact toughness at -20°C only; it is suitable for conventional low-temperature scenarios but does not meet the safety standards for polar projects.

Both have a minimum yield strength of 315 MPa, but LR EH32 has a broader low-temperature operating range and is suitable for more severe polar conditions.

Q2:

What are the available delivery conditions for LR Grade DH32 shipbuilding steel plates?

Common delivery conditions include: AR (hot-rolled), TMCP (thermomechanically controlled rolling), and normalized (N).

Steel plates thicker than 50 mm are typically required to be delivered in the normalized or TMCP condition.

Special heat treatments can be customized according to LR specifications and customer technical requirements. Thickness-direction strength grades Z15, Z25, and Z35 are available.

Q3:

What processing services do you offer for LR DH32 shipbuilding steel plates?

We provide one-stop value-added processing services, including precision cutting, bending, drilling, beveling, surface rust removal, shot blasting, anti-corrosion coating, and heat treatment, to fully meet the customized manufacturing needs of offshore engineering projects in cold regions.

Q4:

Does your LR Grade DH32 shipbuilding steel plate support third-party inspection?

Yes. All of our LR Grade DH32 shipbuilding steel plates fully support inspections by internationally recognized third-party organizations such as SGS, BV, and DNV. They come with complete official LR certification and original factory test reports, ensuring comprehensive quality traceability.

Q5:

What is the difference between LR DH32 and LR DH36 marine steels?

LR DH32 has a minimum yield strength of 315 MPa and is suitable for offshore projects with moderate loads; it offers better weldability and lower costs. LR DH36 has a minimum yield strength of 355 MPa and is suitable for heavy-duty deep-sea projects. LR DH32 is more cost-effective for traditional offshore structures in temperate waters with moderate load requirements.

Q6:

Is LR Grade DH32 marine steel plate compatible with other classification society standards?

Yes. Our LR Grade DH32 marine steel plate fully complies with the relevant marine steel standards of major classification societies, including CCS, ABS, BV, DNV, and NK. We can provide dual or multiple classification society joint certifications based on customer requirements to meet the acceptance standards for ships and offshore engineering projects in cold waters across different countries and regions.