Corten B Corten Weathering Steel

CortenB Corten Weathering Steel

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Corten B is a weather resistant steel which is better suited for heavy and load bearing structures.

 

Corten B Steel is a high-strength, low-alloy steel known for its weathering properties, which allow it to develop a protective rust layer that enhances its durability and aesthetic appeal. Classified as a low-carbon alloy steel, Corten B is primarily composed of iron, with significant alloying elements including copper, chromium, and nickel. These elements contribute to its unique characteristics, making it suitable for various structural applications, particularly in outdoor environments.

 

Corten B full name of atmospheric corrosion-resistant high-strength low alloy steel or atmospheric corrosion-resistant hot-rolled steel, also known as Corten steel, Corten steel is divided into two categories: Corten A, CortenB, is the United States of America Cu-P series of steel on behalf of the steel, belongs to the low alloy high-strength atmospheric corrosion-resistant structural steel, the domestic called weathering steel.

Corten B - Grades and Equivalents

The grades and equivalents of Corten B are given in the following table.

 

Corten	EN 10025-5:2004
Corten B	S355J2W

S355J2W is a medium tensile, low carbon manganese weathering steel which is readily weldable and possess good impact resistance, including in low temperatures. This material is commonly supplied in the untreated or normalized condition.

Machinability of this material is similar to that of mild steel.

 

Alternative Names, Standards, and Equivalents

Standard Organization	Designation/Grade	Country/Region of Origin	Notes/Remarks
ASTM	A588 Gr B	USA	Closest equivalent; designed for structural applications
EN	S355J2W	Europe	Minor compositional differences; similar weathering properties
JIS	SPA-H	Japan	Comparable weathering steel; different alloying elements
ISO	10025-5	International	General standard for structural steels with improved atmospheric corrosion resistance

The differences between these equivalent grades can affect performance in specific environments. For example, while ASTM A588 Gr B and EN S355J2W are similar, the latter may have slightly different mechanical properties due to its European standards.

 

Corten B - Chemical Composition

Corten B Steel is designed to withstand atmospheric corrosion, making it ideal for applications exposed to the elements. The primary alloying elements in Corten B include:

Copper (Cu): Enhances corrosion resistance and contributes to the formation of a protective patina.

Chromium (Cr): Improves overall strength and resistance to oxidation.

Nickel (Ni): Increases toughness and enhances resistance to corrosion in harsh environments.

 

The chemical composition of Corten B are mentioned in the following table.

 

Element	% by mass	Element	% by mass
C	0.19	Al	0.020/0.06
Si	0.30/0.65	V	0.02/0.10
Mn	0.80/1.25	Cu	0.25/0.40
P	0.035	Cr	0.40/0.65
S	0.030	Ni	0.40

Maximum values unless otherwise stated

 

Corten B - Mechanical Properties

The mechanical properties of Corten B are provided in the following table.

 

Grade	Thickness (mm) Strip Products	Plate Products	Yield Strength Rel N/mm² Minimum	Tensile Strength Rm N/mm² Minimum	Elongation A50 % Minimum
Corten B	2 – 13	6 – 40	345	485	19

 

 

 

C	Si	Mn	P	S	Cr	Ni	Cu	V
≤0.19	0.30~0.65	0.80~1.25	≤0.035	≤0.035	0.40~0.65	≤0.40	0.25~0.40	0.02~0.10

 

 

Sampling Direction	Plate Thickness (mm)	σs (MPa)	σb (MPa)	δ5 (％)	AKV 0℃ J	cold bending 180°
Orthogonal	≤100	≥345	≥485	≥19	≥27	d=3a
＞100~125	≥315	≥460
＞125~200	≥290	≥435

 

Physical Properties

Property	Condition/Temperature	Value (Metric)	Value (Imperial)
Density	-	7.85 g/cm³	490 lb/ft³
Melting Point	-	1425 - 1540 °C	2600 - 2800 °F
Thermal Conductivity	20°C	50 W/m·K	34.5 BTU·in/h·ft²·°F
Specific Heat Capacity	-	0.49 kJ/kg·K	0.12 BTU/lb·°F
Electrical Resistivity	-	0.0000017 Ω·m	0.0000017 Ω·ft

Key physical properties such as density and thermal conductivity are significant for applications where weight and heat dissipation are critical, such as in architectural structures and outdoor sculptures.

 

Corrosion Resistance

Corrosive Agent	Concentration (%)	Temperature (°C)	Resistance Rating	Notes
Chlorides	3-5	20-60	Fair	Risk of pitting
Sulfur Dioxide	0.1-0.5	20-40	Good	Moderate resistance
Acids	1-10	20-60	Poor	Not recommended
Alkalis	1-5	20-60	Fair	Risk of stress corrosion

Corten B Steel exhibits excellent resistance to atmospheric corrosion, particularly in urban and industrial environments. However, it is susceptible to pitting in chloride-rich environments, such as coastal areas. Compared to other weathering steels like ASTM A588 and EN S355J2W, Corten B offers similar corrosion resistance but may perform differently under specific conditions due to its unique alloying elements.

 

Heat Resistance

Property/Limit	Temperature (°C)	Temperature (°F)	Remarks
Max Continuous Service Temp	480	900	Suitable for structural use
Max Intermittent Service Temp	600	1112	Short-term exposure
Scaling Temperature	600	1112	Risk of oxidation

At elevated temperatures, Corten B Steel maintains its strength and corrosion resistance, making it suitable for applications in environments where heat exposure is a concern. However, care must be taken to avoid prolonged exposure to temperatures above its scaling limit, which can lead to oxidation and degradation of the material.

 

Weldability

Welding Process	Recommended Filler Metal (AWS Classification)	Typical Shielding Gas/Flux	Notes
MIG	ER70S-6	Argon + CO2	Good for thin sections
TIG	ER70S-2	Argon	Excellent for precision work
SMAW	E7018	-	Requires preheat

Corten B Steel is generally considered to have good weldability. Preheating is recommended to minimize the risk of cracking, especially in thicker sections. Post-weld heat treatment may also be beneficial to relieve stresses.

 

Machinability

Machining Parameter	Corten B Steel	Benchmark Steel (AISI 1212)	Notes/Tips
Relative Machinability Index	60%	100%	Moderate machinability
Typical Cutting Speed	30 m/min	45 m/min	Use sharp tools

Corten B Steel exhibits moderate machinability. Optimal cutting speeds and tooling should be employed to achieve the best results, with attention to tool wear due to its hardness.

 

Formability

Corten B Steel can be formed using both cold and hot processes. It exhibits good formability, allowing for complex shapes and designs. However, care should be taken with bend radii to avoid cracking, particularly in cold forming applications.

 

Heat Treatment

Treatment Process	Temperature Range (°C/°F)	Typical Soaking Time	Cooling Method	Primary Purpose / Expected Result
Annealing	600 - 700 / 1112 - 1292	1-2 hours	Air or water	Softening, improved ductility
Normalizing	850 - 900 / 1562 - 1652	1 hour	Air	Refined grain structure
Quenching	900 - 1000 / 1652 - 1832	30 minutes	Water or oil	Increased hardness and strength

Heat treatment processes such as annealing and normalizing can significantly alter the microstructure of Corten B Steel, enhancing its mechanical properties and performance in various applications.

 

Typical Applications and End Uses

Industry/Sector	Specific Application Example	Key Steel Properties Utilized in this Application	Reason for Selection (Brief)
Architecture	Sculptures and facades	Aesthetic appeal, corrosion resistance	Unique weathering appearance
Construction	Bridges and structural supports	High strength, durability	Long-lasting performance outdoors
Transportation	Railway tracks	Wear resistance, strength	Suitable for heavy loads
Landscaping	Retaining walls	Weathering properties, aesthetic integration	Blends with natural surroundings

Other applications include:

Outdoor furniture

Art installations

Architectural elements in buildings

Corten B Steel is chosen for these applications due to its unique combination of strength, aesthetic appeal, and low maintenance requirements.

 

Important Considerations, Selection Criteria, and Further Insights

Feature/Property	Corten B Steel	Alternative Grade 1 (A588)	Alternative Grade 2 (S355J2W)	Brief Pro/Con or Trade-off Note
Key Mechanical Property	High tensile strength	Similar strength	Slightly lower strength	Corten B may offer better corrosion resistance
Key Corrosion Aspect	Excellent in urban environments	Similar performance	Good but varies with alloying	Corten B excels in atmospheric conditions
Weldability	Good	Excellent	Good	A588 may have better weldability
Machinability	Moderate	High	Moderate	A588 offers easier machining
Formability	Good	Good	Excellent	S355J2W may be better for complex shapes
Approx. Relative Cost	Moderate	Moderate	Lower	Cost varies by region and supplier
Typical Availability	Moderate	High	High	A588 and S355J2W are more widely available

 

 

When selecting Corten B Steel, considerations such as cost, availability, and specific application requirements are crucial. Its unique properties make it suitable for niche applications where aesthetics and durability are paramount. Additionally, safety considerations, such as handling and welding practices, should be adhered to, ensuring optimal performance and longevity in service.

 

CorTen B is a high-strength weathering steel, grade 0400NOR1 chemical composition equivalent to 10CrMoAL, CortenB medium-carbon tempered steel, strength, toughness and hardenability are higher than No. 45 steel, tempering treatment can be obtained after a better overall mechanical properties, cutting and machining performance is still good, but the poor welding performance, cold deformation of the plasticity of the low tempering embrittlement tendency, generally in the tempered state use! The steel is generally used in the tempered condition, and can also be used in the quenched and tempered or normalized condition.

 

Corten B is widely used in gas saving, air preheaters, heat exchangers and evaporators in high sulphur flue gases to resist condensation corrosion of sulphurous flue gases.It has the best resistance to sulfur ions, hydrochloric acid and other acidic corrosion.

 

 

1,Weather Resistance: When Corten B steel plate is exposed to the natural environment, a protective rust-like layer forms on the surface. This rust layer acts as a barrier against further corrosion, giving the steel sheet excellent resistance to atmospheric corrosion.

 

2,Aesthetics: In architectural and artistic applications, the rusted appearance of Corten B is often considered attractive. It is often used to give a rustic or weathered appearance in architectural structures, sculpture and landscaping.

 

3,High Strength: Corten B steel retains its structural strength even when a protective rust layer is developed, making it suitable for a variety of structural applications.

 

4,Low Maintenance: The self-protecting rust layer eliminates the need for regular maintenance and painting, offering significant advantages in terms of cost and effort.

 

5,Versatility: Corten B steel can be used in a variety of applications, including building facades, bridges, cladding, outdoor sculptures, containers and more.

 

 

 

 

 

 

 

 

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