ステンレス鋼 二相系 2205

Duplex 2205 (S31803 / S32205) is a nitrogen-enhanced duplex stainless steel that consists of a microstructure of both austenite and ferrite (50/50 mix). This unique structure gives it twice the yield strength of 316L and significantly superior resistance to pitting and Stress Corrosion Cracking (SCC) in chloride environments. While it is a difficult material to machine due to its high strength and toughness, Jucheng Precision has the heavy-duty CNC equipment and technical expertise to process 2205 effectively. We are a trusted partner for the Oil & Gas and Desalination industries, delivering robust components that withstand the harshest marine and chemical conditions.

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Duplex 2205 Stainless

Duplex 2205 Machining Capabilities

能力 技術的説明 Juchengの強み
Heavy-Duty Turning 2205 is twice as strong as 316 and extremely tough. We use high-rigidity lathes with geared spindles to handle the high cutting forces. Our capability to machine large diameter flanges and valve bodies (up to 800mm) ensures stability and chatter-free finishes.
Chip Control Strategies Duplex produces strong, stringy chips that are hard to break. We utilize high-pressure coolant (70 bar) and specialized chip-breaking inserts. Prevents chip wrapping and tool damage, allowing for automated production of critical oil & gas components.
深穴加工 Drilling manifolds in 2205 requires specialized carbide drills to penetrate the work-hardened surface without seizing. We successfully machine high-pressure fluid channels with precise straightness and surface finish.
ねじフライス加工 Cutting large API or NPT threads in Duplex using thread mills to minimize tool pressure and risk of tap breakage. Ensures perfect thread profiles for high-pressure sealing applications where a stripped thread means a scrapped expensive part.

Fabrication Guidelines for Duplex 2205

Machinability Warning:
Duplex 2205 is significantly harder to machine than 316L. Cutting speeds must be reduced by ~20%, and tool life is shorter. ヒント: Plan for higher machining costs due to increased cycle time and tooling consumption.

加工硬化:
Like austenitic stainless, Duplex work-hardens, but more rapidly. ヒント: Use aggressive feed rates and never let the tool dwell. “Babying” the cut will cause immediate surface hardening.

Stress Corrosion Resistance:
The primary reason to use 2205 is its resistance to Chloride Stress Corrosion Cracking (SCC), which causes 304/316 to fail in hot saltwater. ヒント: Ideal for subsea or desalination equipment.

主な用途

石油・ガス産業
Subsea manifolds, Christmas tree valves, and downhole tools exposed to sour gas (H2S) and high pressure.

Desalination Plants
High-pressure pumps, reverse osmosis piping, and evaporators handling hot, concentrated brine.

化学処理
Pressure vessels and heat exchangers handling aggressive chlorides and acids where 316L life is too short.

Pulp & Paper
Digesters and bleaching equipment requiring high strength and corrosion resistance.

特性

密度 7.80 g/cm³
引張強度 620 - 800 MPa
降伏強度 450 MPa
硬さ 31 HRC (293 HB)
破断伸び 25%
熱伝導率 19.0 W/m-K
PREN (Pitting Resistance) 35+
被削性評価 低
溶接性 良好
SCC耐性 優れた
Max Service Temp 300 °C
最大部品サイズ 2000 x 800 x 600 mm