GB 00Cr22Ni5Mo3N Duplex Steel: Propriedades, Usos & Comparison Guide

If you need a material that balances extreme strength and corrosion resistance—for offshore oil rigs, plantas de dessalinização, ou reatores químicos -GB 00Cr22Ni5Mo3N Duplex Steel é uma mudança de jogo. But what makes its duplex structure and alloy mix so unique? And when should you choose it over common grades like SUS316? This guide breaks down its key traits, Aplicações do mundo real, manufacturing steps, and how it stacks up to other materials. Até o final, you’ll have all the info to pick the right steel for harsh-environment projects.

1. Material Properties of GB 00Cr22Ni5Mo3N

O poder deGB 00Cr22Ni5Mo3N lies in itsduplex structure (50% austenítico + 50% ferritic) and carefully engineeredalloy composition—a combination that delivers both strength and corrosion resistance. Let’s dive into the details:

Core Alloy Elements

• High chromium content (21.0-23.0%): Forms a dense passive film to fight rust and general corrosion.
• Alto teor de níquel (4.5-6.5%): Stabilizes the austenitic phase of the duplex structure, boosting toughness.
• Molybdenum addition (2.5-3.5%): Enhances resistance to corrosão e corrosão de fendas—critical for saltwater or acidic environments.
• Nitrogen addition (0.14-0.20%): Increases tensile strength and reinforces the duplex structure, without sacrificing ductility.
• Ultra-low carbon (máx 0.03%, marked by “00”): Reduces the risk of intergranular corrosion, even after welding.

Mecânica -chave & Corrosion Performance Data

Um exemplo real: A Tianjin offshore engineering firm usedGB 00Cr22Ni5Mo3N for subsea pipeline connectors. The material’s 450 MPa yield strength handled deep-sea pressure (até 300 metros), while its PRE of 38 prevented pitting from saltwater—parts showed zero corrosion after 5 anos.

2. Applications of GB 00Cr22Ni5Mo3N

GB 00Cr22Ni5Mo3N excels in harsh, high-stress environments where standard stainless steels (Como SUS304) or even austenitic grades (like SUS316) fail. Aqui estão seus principais usos, with practical cases:

• Indústria de petróleo e gás: Ideal for subsea wellheads, risers, and pipeline components. A CNOOC (China National Offshore Oil Corporation) project used GB 00Cr22Ni5Mo3N for offshore platform pipes—they withstood saltwater, high pressure, and hydrogen sulfide (H₂s) sem quebrar, outlasting SUS316 by 8 anos.
• Desalination Plants: Critical for reverse osmosis (RO) membranes and brine heaters. A Hainan desalination plant replaced super austenitic steel with GB 00Cr22Ni5Mo3N in brine pumps—maintenance costs dropped by 35% because the steel resisted scaling and pitting from high-salt water.
• Processamento químico: Used for reactors and storage tanks handling strong acids (Por exemplo, ácido sulfúrico, ácido clorídrico). A Shandong chemical plant uses GB 00Cr22Ni5Mo3N for acid mixing tanks—unlike carbon steel, it requires no corrosion inhibitors, economizando $20,000 anualmente.
• Aplicações marítimas: Found in ship hulls, eixos de hélice, and seawater cooling systems. A Shanghai shipyard built a coastal patrol boat with GB 00Cr22Ni5Mo3N hull plates—no anti-corrosion coating was needed, cutting build time by 10%.
• Polpa e indústria de papel: Used for bleaching equipment (Por exemplo, chlorine dioxide tanks). A Guangxi paper mill switched to GB 00Cr22Ni5Mo3N—the material resisted bleach corrosion, extending equipment life from 3 para 8 anos.
• Other uses: Equipamento de processamento de alimentos (high-acid fruit juice tanks), Equipamento farmacêutico (sterile reactors), e Equipamento industrial (heat exchangers for harsh chemicals).

3. Manufacturing Processes for GB 00Cr22Ni5Mo3N

ProducingGB 00Cr22Ni5Mo3N requires precise control to maintain itsduplex structure and performance. Here’s a breakdown of the key steps:

1. Rolamento a quente: Heat the alloy to 1150-1250°C and roll it into plates, coils, or bars. This step shapes the raw material while ensuring the duplex phases (austenite + ferrite) form evenly. A Hebei steel mill hot-rolls GB 00Cr22Ni5Mo3N into 20mm-thick plates for offshore pipes.
2. Recozimento: The most critical step for stabilizing the duplex structure. Heat to 1020-1080°C, hold for 30-60 minutos, Em seguida, a água. This ensures a 50/50 austenite-ferrite balance—too much heat breaks down the duplex phase, while too little leaves internal stress. A Jiangsu factory anneals all GB 00Cr22Ni5Mo3N sheets to avoid cracking during bending.
3. Decapagem: Dip the material in a mix of nitric and hydrofluoric acid to remove oxide scales from rolling/annealing. Pickling brightens the surface and enhances Resistência à corrosão—essential for marine or chemical parts.
4. Rolamento frio (opcional): For thin sheets (Por exemplo, 1-5mm for heat exchangers), use room-temperature pressure to refine surface finish and increase hardness. Cold-rolled GB 00Cr22Ni5Mo3N has a smoother surface but requires re-annealing to restore ductility.
5. Forjamento: Hammer or press the alloy into complex shapes (Por exemplo, corpos da válvula, wellhead components). Forge at 1000-1100°C to keep the duplex structure intact—forging at too low a temperature causes brittleness.
6. Usinagem: Cut the material into final parts using carbide tools. GB 00Cr22Ni5Mo3N’s high strength means it wears tools faster than SUS304—use a cutting speed of 120-150 m/min and coolant to extend tool life.
7. Controle de qualidade: Test each batch for duplex phase balance (via metallographic analysis) e propriedades mecânicas (resistência à tracção, força de escoamento). This ensures compliance with standards—critical for safety-critical parts like offshore pipes.

6. Standards and Specifications for GB 00Cr22Ni5Mo3N

Para garantir que você está recebendo alta qualidade, genuineGB 00Cr22Ni5Mo3N, always check compliance with these standards:

• GB/T 20878: The core Chinese standard for stainless steels—it defines the alloy’s alloy composition (cromo, níquel, molibdênio, nitrogen levels) e propriedades mecânicas.
• ASTM A240: NÓS. standard—GB 00Cr22Ni5Mo3N is equivalent to ASTM S31803 (Aço inoxidável duplex), so it meets this standard’s requirements for flat products (pratos, folhas).
• EM 10088: European standard—equivalent grade is X2CrNiMoN22-5-3, making it suitable for EU-based projects (Por exemplo, North Sea oil rigs).
• Padrões ISO: ISO 15510 aligns with GB 00Cr22Ni5Mo3N for pressure equipment (Por exemplo, Reatores químicos).

Always ask suppliers for:

• Certificação de material (Por exemplo, Mill Test Report) to verify nitrogen content (0.14-0.20%) and duplex phase balance (50/50 austenite/ferrite).
• Conformance Testing results (Por exemplo, GB/T 4334.5 for intergranular corrosion, GB/T 10125 for salt spray testing).
• Technical Data Sheets (TDS) with annealing temperatures and welding guidelines.

Controle de qualidade is non-negotiable: A Fujian supplier once sold fakeGB 00Cr22Ni5Mo3N with low molybdenum—parts corroded in seawater within 6 meses. Always confirm compliance before purchasing.

7. Comparação: GB 00Cr22Ni5Mo3N vs. Other Materials

Como aconteceGB 00Cr22Ni5Mo3N stack up against common stainless steels and alloys? Below is a side-by-side comparison focusing on strength, Resistência à corrosão, e custo:

Por exemplo: If you’re building an offshore oil pipeline, GB 00Cr22Ni5Mo3N is better than SUS316 (mais forte, more corrosion-resistant) and cheaper than titanium (75% menor custo). If you’re making a home kitchen sink, no entanto, SUS304 is more cost-effective.

Perspectiva da tecnologia YIGU

Na tecnologia Yigu, Nós fornecemosGB 00Cr22Ni5Mo3N to offshore, desalination, and chemical clients for 15 anos. Its biggest advantage is balance—twice the yield strength of SUS316 and near-super austenitic corrosion resistance, at a mid-range price. Our data shows it cuts equipment replacement costs by 40% vs.. SUS316 in harsh environments. We also provide custom forging for complex parts like wellheads and offer phase-balance testing to ensure quality. For clients needing strength and corrosion resistance in one material, it’s our top duplex steel recommendation.

Perguntas frequentes

1. Can GB 00Cr22Ni5Mo3N be used in high-temperature environments?
   It performs well up to 300°C. Acima disso, the duplex structure may shift (more ferrite), reduzindo a resistência à corrosão. Para temperaturas acima de 300 ° C (Por exemplo, peças do forno), use super austenitic steel instead.
2. Is GB 00Cr22Ni5Mo3N easy to weld?
   It’s weldable but requires controlled heat input (máx 20 kJ/inch) to preserve the duplex phase. Use matching filler metals (Por exemplo, ER2209) and post-weld annealing if the part will be in highly corrosive environments.
3. Do I need to coat GB 00Cr22Ni5Mo3N for marine use?
   No—its PRE of 38 provides enough corrosion resistance for most marine environments (Por exemplo, casco de navio, seawater pipes). Coating is unnecessary and may trap moisture, causing crevice corrosion.