2507 Super Duplex Forged Ring & Hollow Bar

• 2507(SAF2507) super‑duplex stainless steel ring & hollow bar, UNS S32750 / W.Nr 1.4410, compliant with ASTM A182 F53 and ASTM A479 specifications
• Balanced 50:50 austenite‑ferrite dual‑phase microstructure; PREn ≥40, outstanding resistance to chloride pitting, crevice and stress‑corrosion‑cracking(SCC)
• NACE MR0175 / ISO15156‑3 qualified for sour‑gas offshore service; yield strength nearly double compared to conventional 316L austenitic stainless steel
• Good erosion‑corrosion & corrosion‑fatigue performance for seawater, brine and high‑chloride process media; fully magnetic for convenient NDT field inspection
• Supplied in solution‑annealed water‑quenched condition for balanced duplex phase ratio and good machinability for ring / hollow‑bar CNC fabrication
• Custom OD, ID, wall‑thickness, height / length; full CNC machining strictly per customer CAD/PDF drawings
• Premium raw stock for offshore oil‑gas rolled ring forgings, seawater desalination hollow sleeves, heat‑exchanger components, flanges and high‑pressure chemical‑process hardware

This series of 2507 super duplex rings and hollow bars are manufactured by hot forging / hot piercing extrusion, followed by strict solution annealing and rapid water quenching to obtain well‑balanced austenite‑ferrite 50/50 duplex microstructure. Standard delivery is solution‑annealed soft blank ready for rough‑and‑finish CNC machining.

2507 (SAF2507, UNS S32750 / 1.4410 F53) is widely‑used high‑alloy super‑duplex stainless steel. High chromium‑molybdenum‑nitrogen composition delivers high PREn value, excellent local chloride corrosion resistance and much higher yield strength than common austenitic grades. It is approved for NACE sour‑gas working environments. Widely processed into seamless rolled rings, hollow‑bar sleeves, flanges, heat‑exchanger components and downhole hardware for offshore‑oil‑gas, seawater‑desalination, petrochemical and power‑plant FGD industries.

• Super‑duplex stainless steel with balanced austenite‑ferrite dual‑phase microstructure; non‑hardenable via quenching or aging treatment
• PREn ≥40; excellent pitting, crevice corrosion and chloride‑SCC resistance, outperforms standard duplex 2205 for severe chloride‑containing service conditions
• NACE MR0175 compliant for H₂S‑containing sour‑gas environments; high yield strength allows lightweight thin‑wall component design
• Good erosion‑corrosion and corrosion‑fatigue performance for flowing seawater, brine and particle‑containing process fluid media
• Ferromagnetic property, convenient for on‑site magnetic particle non‑destructive inspection; good weldability, strict post‑weld heat‑control required to avoid sigma‑phase precipitation
• Reminder: Long‑term continuous service temperature shall not exceed 300 °C to prevent harmful sigma‑phase formation and toughness degradation

表格

表格

• Duplex / Super‑Duplex Stainless Steel: 2205(S32205),2507(S32750),S32760(Zeron100)
• Super‑Austenitic: 904L, 254SMO
• Inconel Series: 600, 601, 625, 718
• Incoloy Series: 800H / 800HT, 825, 925
• Hastelloy Series: C‑4, C22, C276, B3
• Heat‑Resistant Stainless: 253MA, 310S
• PH Stainless Steel:17‑4PH,15‑5PH
• Alloy Steel:4140, F22, F91, A105

1 High PREn Chloride Corrosion ResistancePREn ≥40 delivers excellent pitting, crevice and chloride‑SCC resistance, well‑suited for seawater, brine and high‑chloride offshore process media, performance superior to standard duplex 2205.

2 High‑Strength Duplex Dual‑Phase Structure
Yield strength nearly double of 300‑series austenitic stainless steels; enables thinner‑wall lightweight ring‑hollow‑bar component design for pressure‑bearing equipment.

3 NACE‑Qualified Sour‑Gas Service Capability
Complies with NACE MR0175 / ISO15156‑3 standard, suitable for H₂S‑containing sour‑oil‑gas downhole and topside hardware applications.

4 Good Erosion‑Corrosion & Corrosion‑Fatigue Performance
Withstands high‑velocity seawater and particle‑laden brine media; ideal for desalination, cooling‑water circulating system ring‑hollow‑bar parts.

5 Cost‑Effective Nickel‑Alloy Alternative
Competitive material option for heavy‑chloride working conditions compared to high‑grade nickel‑base superalloys.

• Offshore & Sour Oil‑Gas: Seamless rolled ring forgings, downhole hollow‑bar sleeves, seawater‑injection component blanks, sour‑service flange preforms
• Seawater Desalination: RO high‑pressure ring hardware, brine‑handling hollow‑bar components, desalination plant heat‑exchanger blanks
• Chemical‑Processing Industry: High‑chloride reactor ring parts, circulating‑pump hollow‑bar housings, corrosive‑media flange forgings
• Power‑Plant FGD: Flue‑gas desulfurization scrubber ring segments, condensate‑exposed hollow‑bar structural blanks
• Marine & Geothermal Engineering: Offshore‑platform seawater‑system ring‑hollow‑bar components, geothermal‑well pressure‑resistant hardware

We provide integrated hot‑forging / hot‑pierced hollow‑bar & seamless rolled‑ring production, full custom CNC machining per customer CAD/PDF drawings:

• Cut‑to‑length / ring‑height sizing, facing, centering, OD turning, ID boring, chamfering
• Precision threading, internal‑external groove machining, cylindrical grinding & surface polishing for ring‑hollow‑bar parts
• Technical consultation for super‑duplex welding procedure and sigma‑phase‑prevention guidance for thermal‑processing
• Pickling, passivation anti‑corrosion surface finishing

We supply 2507(S32750) rolled‑ring forgings, hollow‑bar blanks and fully‑machined components for offshore‑oil‑gas, desalination, chemical‑processing and global industrial clients.

• 100% UT ultrasonic + eddy‑current inspection for forging / piercing internal segregation, inclusion and surface crack defects
• Full‑batch tensile, yield, elongation & Charpy‑impact mechanical‑property testing for each heat lot; NACE‑relevant hardness verification if required
• Spectrometer full‑spectrum chemical‑composition verification per heat number (strict check Cr‑Ni‑Mo‑N key duplex‑forming elements)
• Metallographic duplex‑phase‑balance inspection, verify 50/50 austenite‑ferrite ratio and absence of harmful sigma precipitates
• High‑precision micrometer & CMM inspection for OD, ID, wall‑thickness, height / length and dimensional‑tolerance control

Mill Test Certificate EN 10204 3.1 / 3.2 can be issued and delivered together with shipment documents before delivery.

Packing - Inner: Independent anti‑rust plastic sleeve + waterproof film full wrap for ring / hollow‑bar surface scratch protection - Outer: Reinforced fumigated wooden pallet / wooden case with separation blocks to avoid collision & deformation - Custom heavy‑duty export packaging for large‑diameter rings & heavy‑wall hollow bars available upon request

Lead Time
Normally 20‑60 working days after receiving advance payment. Exact lead time depends on ring / hollow‑bar dimension, wall‑thickness, order quantity and custom‑machining demands.

Please specify part type (ring / hollow bar), OD‑ID‑wall‑thickness‑dimension, drawings and whether you require raw forging blank or fully‑machined finished parts. Our super‑duplex‑steel metallurgy team will provide competitive factory price within 24 hours. Free offshore‑sour‑gas & high‑chloride‑medium material‑matching technical consultation!