Duplex 2205 Stainless Steel Coil ASTM A240 Cold Rolled 0.5mm-3mm 2b Surface Strong Corrosion Resistance Seawater Equipment 2205

Global Leader in Stainless Coil Sheet Fabrication Services

Zhejiang Zhongzheng stainless steel Co., Ltd. specializes in crafting premium Duplex 2205 Stainless Steel Coils, conforming to ASTM A240 standards. Our offerings range in thickness from 0.3mm to 16mm, engineered to meet rigorous standards such as ASTM, ASME, ISO, UNS, and EN. Duplex 2205 is a superior austenitic-ferritic stainless steel, outshining 304 and 316 in performance and corrosion resistance. This alloy's unique microstructure and additives provide exceptional resistance to stress corrosion cracking, pitting, and induced crevice corrosion. With oxidation resistance up to 980°C, it's ideal for numerous applications, though caution is needed for prolonged exposure between 300°C and 1000°C. Zhongzheng's Alloy 2205 stainless steel strip, coil, and sheet are versatile for a broad range of uses.

Founded in 2003, Zhongzheng has rapidly ascended to the forefront of China's stainless steel industry. With two decades of innovation and growth, we specialize in premium stainless steel materials and processing services.

For over 20 years, Zhongzheng has excelled in the global market. In 2022, our export revenue surpassed US$100 million, ranking us among China's leading stainless steel trade and processing firms. With three export service bases in China and strategic partnerships with top engineering firms, steel mills, and international traders, we continuously enhance our capabilities to serve and expand in overseas markets.

Zhongzheng International offers a comprehensive stainless steel chain supermarket service, in collaboration with numerous renowned steel mills worldwide. Our inventory boasts 60,000 tons of standard stainless steel and 20,000 tons of specialty metals, including duplex steel, nickel-based alloys, and heat-resistant steel. We guarantee impeccable quality and adherence to all specifications and delivery requirements.

Equipped with advanced steel processing machinery and a state-of-the-art physical and chemical testing center, Zhongzheng provides a range of specialized services including cutting, grinding, forming, beveling, welding, heat treatment, machining, and spraying.
Our services span over 30 industries, such as automotive, home appliances, elevators, new energy, vacuum semiconductors, food and beverage/bio-fermentation, petrochemicals, and energy equipment. Collaborating with steel mills and research institutions, we offer comprehensive solutions from project design and material development to process optimization.

GENERAL PROPERTIES

Duplex 2205 is a superior two-phase, ferritic and austenitic stainless steel, expertly alloyed with 22% chromium, 3% molybdenum, and 5-6% nickel. As the most widely used duplex stainless steel grade, it boasts a yield strength twice that of standard austenitic grades. Additionally, it offers remarkable fatigue strength and outstanding resistance to stress corrosion cracking, crevice, pitting, erosion, and general corrosion, even in the most challenging environments.

APPLICATIONS

• Chemical Processing, Transport, and Storage - Ideal for pressure vessels, tanks, piping, and heat exchangers.

• Oil and Gas Exploration and Processing Equipment - Perfect for piping, tubing, and heat exchangers.

• Marine and High-Chloride Environments - Provides exceptional durability and longevity.

• Effluent Scrubbing Systems - Ensures efficient and reliable operation.

• Pulp and Paper Industry - Suitable for digesters, bleaching equipment, and stock-handling systems.

• Cargo Tanks for Ships and Trucks - Guarantees safety and performance.

• Food Processing Equipment - Maintains hygiene and operational efficiency.

• Biofuels Plants - Supports sustainable energy production.

STANDARDS

• ASTM/ASME: A240 UNS S32205/S31803

• EURONORM: 1.4462 X2CrNiMoN 22.5.3

• AFNOR: Z3 CrNi 22.05 AZ

• DIN: W.Nr 1.4462

CORROSION RESISTANCE

• Thanks to its high chromium, molybdenum, and nitrogen content, Duplex 2205 offers superior corrosion resistance compared to 316 and 316L in most environments.

• The chromium, molybdenum, and nitrogen content also ensures high resistance to pitting and crevice corrosion, even in oxidizing and acidic solutions.

• Resistant to chloride stress corrosion cracking and effective at temperatures up to approximately 302°F (150°C).

• The ferrite presence enhances the performance of Duplex 2205 in caustic environments.

HEAT RESISTANCE

• Similar to other duplex stainless steels, Duplex 2205 exhibits excellent oxidation resistance at high temperatures.

• However, it is prone to embrittlement when exposed to temperatures above 572°F (300°C) for even short periods, making it unsuitable for use beyond this temperature.

WELDING CHARACTERISTICS

• Duplex 2205 showcases good weldability.

• Generally, it should not be welded without filler metal to avoid excessive ferrite formation.

HEAT TREATMENT

• The annealing temperature range is between 1868 to 2012°F (1020 to 1100°C).

• It cannot be hardened by heat treatment, though it does work-harden.

• Special considerations are necessary to compensate for a higher coefficient of thermal expansion, preventing warping and distortion.

PROCESSING - HOT FORMING

• Most producers recommend a maximum hot forming temperature between 2010 and 2100°F (1100 to 1150°C). If the workpiece shape is not compact, the edges may cool faster than the bulk, risking cracks in cooler regions.

PROCESSING - COLD FORMING

• Duplex 2205 exhibits excellent formability across a variety of fabrications. However, the high strength inherent in Duplex 2205 can present challenges. Even with adequately powerful equipment, allowances must be made for the increased spring-back due to the grade's elevated strength.

MACHINABILITY

Duplex 2205 is marginally more challenging to machine compared to 300 series austenitic stainless steels. This demands higher cutting forces, leading to accelerated tool wear. Key machining guidelines include: A) Employ powerful, rigid machinery with robust, secure mounting of tools and workpieces, B) Minimize vibration by maintaining short tool extensions, C) Utilize a nose radius on the tool that is only as long as necessary, ensuring sharp edges on carbides with adequate strength, and D) Design machining sequences to always achieve a depth of cut below the work-hardened layer from previous passes.

Features of Duplex 2205 Stainless Steel Coils

• Type 2205 is a duplex (austenitic/ferritic) stainless steel enriched with chromium, molybdenum, and nitrogen, enhancing its performance and corrosion resistance compared to 304 and 316 stainless steels. The alloy's mixed austenite/ferrite microstructure, coupled with these additives, provides formidable resistance to stress corrosion cracking, pitting, and ***-induced crevice corrosion. Alloy 2205 maintains acceptable oxidation resistance up to 980°C. However, specific applications should be considered, as the material can become brittle when exposed to temperatures between 300°C and 1000°C for prolonged periods. Type 2205 stainless steel strip, coil, and sheet are suitable for a diverse range of applications.

Commonly Used Surface Finishes of Stainless Steel Coils

The surface finish of 201 stainless steel coils can vary based on the cold rolling processes and subsequent surface treatments employed. Available treatments include NO.1, 2B, 4, HL, 6, 8, BA, TR hard, heavy rolling bright 2H, polished bright, and other specialized finishes:

• NO.1: This surface finish is achieved after hot rolling, heat treatment, and pickling of stainless steel strip. It removes black oxide scale formed during hot rolling and heat treatment. The No. 1 surface is silvery white and matte, ranking highest in surface treatment. It is typically utilized in heat-resistant and corrosion-resistant industries that do not require high surface gloss, such as the alcohol industry, chemical industry, and large container manufacturing.

• 2B: In contrast to the 2D surface, the 2B surface is refined by a light roller, resulting in a brighter finish. The surface roughness Ra value, measured by equipment, ranges from 0.1 to 0.5μm, a standard value for most processing types. This surface has the greatest adaptability and is suitable for industries like chemicals, papermaking, petroleum, medical fields, and building curtain walls.

• TR Hard Surface: TR stainless steel, also known as hard steel, includes grades such as 304 and 301. It is used in high-strength, high-hardness applications like railway vehicles, conveyor belts, springs, and washers. The aim is to leverage the work-hardening characteristics of austenitic stainless steel to enhance the strength and hardness of steel plates through cold working methods such as rolling. To replace the flatness of the 2B base surface, the hard material undergoes gentle rolling by a few percent to tens of percent, without annealing post-rolling. Thus, the TR hard surface reflects the rolled finish after cold rolling.

• Re-rolled Bright 2H: Following the rolling operation, the stainless steel strip undergoes a sophisticated bright annealing process. Utilizing a continuous annealing line, the strip is rapidly cooled while traveling at a speed of 60-80m/min. This method ensures the surface finish achieves a re-rolled bright 2H appearance, delivering superior quality and luster.

• No. 4: The No. 4 surface boasts an impressive polishing effect, significantly brighter than No. 3. This finish is achieved by polishing the cold-rolled stainless steel plate with a 2D or 2B surface using a sanding belt with a particle size of 150-180#. The surface roughness (Ra) ranges between 0.2 and 1.5μm, measured meticulously by specialized tools. Widely recognized for its versatility, the No. 4 surface finds extensive applications in restaurants, cooking equipment, medical instruments, architectural decoration, containers, and more.

• HL: The HL surface, or hairline finish, is a hallmark of sophistication. Defined by the Japanese JIS standard, it features a continuous hairline abrasive surface produced using a 150-240# abrasive belt. The Chinese GB3280 standard provides less clarity on the specifics, yet HL remains a favorite for architectural decoration, including elevators, escalators, and exterior walls, thanks to its elegant and polished appearance.

• No. 6: The No. 6 surface undergoes additional polishing on top of the No. 4 finish using a Tampico brush or W63 grit abrasive material as specified in the GB2477 standard. This process results in a surface with excellent metallic luster, softness, gentle reflection, and no imaging. These properties make it ideal for curtain walls, tassel decorations, and high-quality cooking supplies.

• BA: The BA surface is achieved through a bright heat treatment after cold rolling. This involves annealing in a protective atmosphere to prevent oxidation and retain the glossy cold-rolled finish. The surface is then polished with a high-precision smooth roller to enhance brightness. Its surface roughness is evaluated to be between 0.05-0.1μm, nearing mirror-like quality. BA surfaces are highly versatile, suitable for food utensils, household appliances, medical devices, automotive parts, and decorative applications.

• No. 8: The No. 8 surface, also known as the mirror finish, offers maximum reflectivity with no abrasive particles. Referred to as 8K board in the stainless steel processing industry, it requires minimal polishing if made from BA material. Its stunning, reflective surface makes it ideal for building entrances and interior decoration, adding a touch of elegance.

Q1: What products can you offer?

A: We provide an extensive range of steel types including 310S, 316L, 304, 304L, 201, 904L, 316H, 316, 316L, 300 series, and duplex stainless steels like 2205, 2304, 2101, 2507, among others. Additionally, we offer high-nickel alloys such as 904L, 800H, and 600H.
400 series, and duplex stainless steel like 2205, 2304,2101,2507,etc. 904L, 800H, 600H high-nickel alloy.

Q2. Can you produce the products according to my own drawings?

Yes, we can manufacture products precisely according to your drawings, ensuring they meet your utmost satisfaction.

Q3. How does your factory do regarding quality control?

Quality is our top priority. We consistently emphasize comprehensive quality control from the initial stages to the final product.

Q4. Can I request to change the form of packaging and transportation?

Yes, we can modify the packaging and transportation forms based on your requests,
however, you will be responsible for any additional costs and differences incurred during this period.

Q5. How does your factory do regarding quality control?

Quality is our utmost priority. From inception to completion, we meticulously control every stage of the production process to ensure unparalleled excellence.

Q6. How long is the delivery time?

A: Typically, delivery takes between 7 to 20 working days after payment confirmation.

In urgent cases, we expedite the process to ensure your order is completed ahead of schedule.

Q7. What is your Payment?

A: 100% T/T in advance, Western Union (for small orders)

B: 30% T/T deposit with the balance 70% due before shipment

C: 100% Irrevocable LC at sight (for large orders)

Q8: Can you make DDQ (Deep Drawing Quality)?

A: Absolutely. Our materials are suitable for deep drawing applications like stainless steel pots, sinks, and bowls. Share your specific usage requirements, and we will tailor the mechanical properties to meet your needs.

Q9: How to get a sample?

A: FREE samples are available for your inspection and testing. For smaller pieces, we may cover the courier cost, depending on the circumstances.

Q10: Which countries have you exported to?

A: To date, our stainless steel materials have been exported to Vietnam, Thailand, Turkey, Russia, Morocco, South Korea, India, Pakistan, the UAE, Ukraine, and several other countries.