EN 10028-3 P355N Boiler And Pressure Vessel Steel Plate

Overview Chemical Composition Mechanical Properties Applications Technical Documentation FAQ Get a Quote

Overview

EN10028-3 P355N Boiler And Pressure Vessel Steel Plate is a kind of non-alloy or low-alloy high-strength steel plate. The steel plate has sufficient strength, toughness, weldability and fatigue resistance in pressure-bearing environments, and is suitable for pressure-bearing equipment under medium-temperature and high-pressure environments.

EN10028-3 P355N Boiler And Pressure Vessel Steel Plate is a weldable fine-grained normalized steel defined in the EN10028-3 standard. It has the core advantages of 355MPa grade yield strength, good low-temperature toughness and weldability, and is widely used in boilers, pressure vessels and other pressure-bearing equipment. Its production and inspection must strictly comply with the standard requirements to ensure safety and reliability in medium-temperature and high-pressure environments.

Chemical Composition

Grade	EN10028-3 P355N
Element	C	Si	Mn	P	S	Al
Content(%)	≤0.20	≤0.60	1.70	≤0.025	≤0.010	≥0.020

Mechanical Properties

Grade	Yield Strength(MPa)	Tensile Strength(MPa)	Elongation (%)	Impact Energy (KV)
EN10028-3 P355N	≥355	470-630	≥20	≥40 J at -50°C

Applications

Due to its high strength, good weldability and low-temperature toughness, EN10028-3 P355N Boiler And Pressure Vessel Steel Plate is mainly used in:

1. Power station boilers (e.g., steam boiler drums, water-cooled walls).

2. Pressure vessels (e.g., reactors and storage tanks in the chemical and petroleum industries).

3. Pressure pipeline components (e.g., heads, flanges).

4. Structural parts requiring resistance to medium temperatures (≤400°C) and high pressure

Technical Documentation

FAQ

Q1:

What custom processing services do you offer for LR Grade AH36 shipbuilding steel plates?

A:

We provide one-stop value-added processing services, including precision cutting, bending, drilling, beveling, surface derusting, shot blasting, anti-corrosion treatment, and heat treatment, to meet all custom manufacturing and installation requirements for high-standard offshore engineering projects.

Q2:

Does your LR Grade AH36 shipbuilding steel plate support third-party inspection?

A:

Yes. All of our LR Grade AH36 shipbuilding steel plates fully support third-party inspections by internationally recognized organizations such as SGS and BV. They come with complete official LR certification and original factory test certificates, ensuring comprehensive quality traceability.

Q3:

What is the application of LR Grade AH36 shipbuilding plate?

A:

LR Grade AH36 shipbuilding steel plate is a high-strength hull structural steel certified by Lloyd’s Register (LR). It is primarily used in ultra-large ocean-going vessels, deep-sea offshore platforms, heavy-duty offshore engineering facilities, and high-load-bearing ship structures, and serves as a core load-bearing material for high-grade offshore engineering projects.

Q4:

Is LR Grade AH36 marine steel plate compatible with other classification society standards?

A:

Yes. This product fully complies with the relevant marine steel standards of major classification societies such as CCS, ABS, BV, and DNV. We can provide dual or multiple classification society joint certifications based on customer requirements to meet marine engineering acceptance standards in different countries or regions.

Q5:

What is the main difference between LR Grade AH32 and LR Grade AH36 shipbuilding steel plates?

A:

Both are high-strength hull structural steels certified by Lloyd’s Register (LR). The key difference lies in their yield strength grades: LR AH32 has a minimum yield strength of 315 MPa, while LR AH36 has a minimum yield strength of 355 MPa.

Therefore, LR AH32 is suitable for conventional-tonnage vessels and general offshore engineering projects, offering better cost-effectiveness; LR AH36, on the other hand, is intended for applications requiring higher strength, such as ultra-large vessels and high-load-bearing offshore structures.

Q6:

Does your LR Grade AH32 shipbuilding steel plate support third-party inspection?

A:

Yes. All of our LR Grade AH32 shipbuilding steel plates support inspections by internationally recognized third-party organizations such as SGS, BV, and DNV. They come with complete official LR certification and original mill test certificates, ensuring full quality traceability.

Q7:

What processing services can you provide for LR Grade AH32 shipbuilding steel plates?

A:

We offer one-stop value-added processing services, including precision cutting, bending, drilling, beveling, surface derusting, shot blasting, anti-corrosion treatment, and heat treatment, to meet all custom manufacturing and installation requirements for offshore engineering projects.

Q8:

Does LR Grade AH32 shipbuilding steel plate require special welding procedures?

A:

LR Grade AH32 shipbuilding steel plate offers excellent overall weldability, stable material properties, and a low carbon equivalent. It is suitable for all conventional shipbuilding welding processes and does not require complex preheating or special protective measures.

Standard marine welding operating procedures ensure consistent weld quality, effectively reduce construction difficulties, and improve project efficiency.

Q9:

What is the application of LR Grade AH32 shipbuilding steel plate?

A:

LR Grade AH32 shipbuilding steel plate is primarily used in the construction of commercial vessels, conventional offshore platforms, coastal marine infrastructure, and the maintenance of marine equipment. It is suitable for various marine engineering applications that require high strength and stable overall structural performance.

Q10:

What is the weldability of LR Grade E shipbuilding steel plates?

A:

The weldability is good, and the carbon equivalent (CEV) is typically controlled at ≤ 0.40% (depending on the specific thickness).

For thicknesses of 40 mm or less, preheating is generally not required at ambient temperatures (≥0°C), but low-hydrogen electrodes must be used.

For plates thicker than 40 mm or highly constrained joints, preheating to 50°C–100°C is recommended to reduce the cooling rate and prevent cold cracks.

Important Note: Welding consumables approved by the classification society and compatible with LR Grade E must be used.

Q11:

What is the main difference between LR Grade D and Grade E marine steel?

A:

The basic strength parameters of the two grades are the same; the key difference lies in low-temperature impact resistance and application scenarios.

LR Grade D must pass an impact test at -20°C and is suitable for conventional cold-water regions; LR Grade E must pass an impact test at -40°C and offers superior low-temperature toughness and resistance to brittle fracture, making it suitable for polar and extremely cold marine environments.

Q12:

What is the application of LR Grade E shipbuilding steel plates?

A:

LR Grade E shipbuilding steel plate is a high-performance, ordinary-strength marine structural steel plate with exceptional impact toughness at ultra-low temperatures of -40°C. It is primarily used in polar icebreakers, polar research vessels, ultra-cold ocean-going vessels, extremely cold offshore structures, and high-end marine infrastructure requiring resistance to brittleness at extremely low temperatures. It serves as an upgraded replacement for LR Grade D shipbuilding steel plate in polar and extremely cold marine environments.

Q13:

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

A:

The standard delivery conditions for LR Grade D shipbuilding steel plates are as follows:

1) Hot-rolled (HR): Suitable for thin plates with a thickness of ≤12 mm; this is the standard supply condition.

2) Thermomechanically Controlled Process (TMCP): The primary delivery condition for medium- and thick plates; grain refinement ensures compliance with impact toughness requirements at -20°C without the need for additional heat treatment.

3) Normalized (N): Suitable for thick plates with a thickness of ≥50 mm; used for critical components with stringent low-temperature toughness requirements.

All delivery conditions must pass LR third-party inspection prior to shipment.

Q14:

What processing services do you offer for LR Grade D marine steel plates?

A:

We provide one-stop value-added processing services, including precision cutting, bending, drilling, beveling, surface derusting, shot blasting, anti-corrosion treatment, and heat treatment, to meet all custom manufacturing and installation requirements for extreme-low-temperature offshore engineering projects.

Q15:

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

A:

Yes. All of our LR Grade D shipbuilding steel plates are fully compatible with 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.