By Shape

By Grades

Comparisons

Finish

Maintenance

FH550 | High-Strength Shipbuilding Steel

FH550 | High-Strength Shipbuilding Steel

SteelPRO Group offers FH550 high-strength structural steel plates for shipbuilding.

Class Cert.: ABS/BV/CCS/DNV/KR/LR/NK/RINA/RS/PRS
Material: 
High-Strength Low-Alloy Steel
Thickness:
6-100 mm, or customized
Width: 900-4800 mm, or customized
Length: 3000-25000 mm, or customized
Condition of Delivery: TMCP/Q&T/TMCP+T, or as request
Additional Requirements: Z-Direction Performance (Z15, Z25, Z35), UT Testing, Impact Toughness Test, etc.
Stock: In stock
Origin: Hebei/Henan/Jiangsu, China
Port: Qingdao

Looking for other Grade 550 high-strength steel?
Click here for DH550.

Description

What Is FH550?

FH550 steel is a high-strength, low-alloy structural steel primarily composed of iron, carbon, and alloying elements like manganese and silicon, with possible additions of chromium, molybdenum, or nickel to improve corrosion resistance and strength. The “F” denotes its excellent toughness at -60°C, and the “H” signifies high yield strength. With a yield strength of 550 MPa, it can endure significant stress without permanent deformation.

One of FH550 steel’s key advantages is its combination of strength and formability, making it both durable and easy to process. It also offers excellent weldability, reducing the risk of cracking during welding due to its low carbon content.

FH550 is widely used in shipbuilding, bridges, offshore platforms, and large industrial structures, particularly in cold environments such as polar marine engineering. Its high strength and relatively light weight make it ideal for pressure vessels and cranes where both durability and weight savings are crucial.

Characteristics of FH550

Here are the major characteristics of FH550 steel:

  • High strength for heavy-duty applications.
  • Excellent toughness at low temperatures.
  • Resistant to impact and fatigue.
  • Suitable for use in harsh marine environments.
  • Good weldability and formability.

Chemical Compositions

ElementMax %
Carbon, C0.18
Manganese, Mn1.60
Silicon, Si0.10-0.55
Sulfur, S0.025
Phosphorus, P0.025
Copper, Cu0.35
Chromium, Cr0.20
Nickel, Ni0.80
Molybdenum, Mo0.08
Aluminum, Al0.020 min
Niobium, Nb0.20-0.05
Vanadium, V0.05-0.10
Titanium, Ti0.0007-0.05
Nitrogen, N0.009

Physical Properties

PropertyMetricImperial
Density7.8 g/cm³0.282 lb/in³
Melting Point1425°C – 1450°C2597°F – 2642°F
Thermal Conductivity16.2 W/(m·K)9.35 BTU/(hr·ft·°F)
Electrical Conductivity1.20 MS/m6.95% IACS
Specific Heat Capacity460 J/(kg·K)0.110 BTU/(lb·°F)
Thermal Expansion Coefficient11.7 x 10⁻⁶ /K6.5 x 10⁻⁶ /°F
Electrical Resistivity83.3 nΩ·m830 μΩ·in

Mechanical Properties

Yield Strength (Min Mpa)Tensile Strength (Mpa)Elongation (Min %)Temperature (°C)Charpy V Impact Test Transverse (J)Charpy V Impact Test Longitudinal (J)
550670-830≥16-603755

Industries & Applications

IndustryCommon Products
ShipbuildingHull structures, Deck plates, Bulkheads, Masts
Offshore EngineeringPlatforms, Rig supports, Underwater pipelines, Anchors
Bridge ConstructionSuspension cables, Bridge decks, Girders, Piers
Heavy MachineryExcavator arms, Bulldozer frames, Crane booms, Loaders

Machining

Heat Treatment

  • Preheat: Heat the steel slowly to 600-650°C to reduce thermal shock.
  • Austenitizing: Increase the temperature to 880-920°C and hold until uniform heat distribution is achieved.
  • Quenching: Rapidly cool the steel by quenching in oil or water to achieve martensitic transformation.
  • Tempering: Reheat the steel to 500-700°C depending on desired hardness and toughness. Hold for 1-2 hours, then cool in air.
  • Stress Relieving (optional): After quenching, reheat to 150-200°C to relieve residual stresses, then cool slowly.

Surface Treatment

  • Anodizing: Enhances corrosion resistance and appearance.
  • Powder Coating: Provides a durable and protective finish.
  • Electroplating: Adds a metal layer for corrosion and wear resistance.
  • Polishing: Improves surface smoothness and shine.
  • Sandblasting: Cleans and textures the surface.

*Customization is available upon request.

Our Service

SteelPRO Group – manufacturer and solution provider for special steel, offering multi-industry application solutions and customised services, 100% quality free, accompanying customers in their growth!

Our Quality Control

  • Roundness
  • Tolerance
  • Microstructure
  • Non-Destructive Testing
  • Destructive Testing
  • Process Control

Service Integration Processing

  • Welding
  • Metal Fabrication
  • CNC Machining
  • Lathe
  • Forming

QUESTION 1

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Optio, neque qui velit. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur.

QUESTION 2

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Optio, neque qui velit. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur.

QUESTION 3

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Optio, neque qui velit. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur.

QUESTION 4

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Optio, neque qui velit. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur.

QUESTION 4

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Optio, neque qui velit. Magni dolorum quidem ipsam eligendi, totam, facilis laudantium cum accusamus ullam voluptatibus commodi numquam, error, est. Ea, consequatur.

CONTACT

Please enable JavaScript in your browser to complete this form.

CONTACT

Please enable JavaScript in your browser to complete this form.

Certifications

Other Products

Scroll to Top

Send Message

Please enable JavaScript in your browser to complete this form.
Case study Page 1
Case study Page 2
Case study Page 3
Case study Page 4