2507 (UNS S32750 / SAF 2507) super-duplex stainless steel plate for projects that demand top-tier chloride pitting and crevice resistance combined with high strength; in 2025 typical market prices for 2507 plate range widely depending on country, mill source, thickness and finish — roughly $1,200 to $8,750 per tonne ($1.20–$8.75 per kg) in factory/FOB terms, with higher prices for small orders, certified mill sheets, and finished/heat-treated plates. Buyers should evaluate total landed cost (material + certification + logistics + alloy surcharge) rather than base plate price alone.

What 2507 (S32750) is — quick technical snapshot

We manufacture and supply UNS S32750 (often marketed as SAF-2507 or simply "2507") — a super duplex stainless steel engineered to deliver substantially higher strength and pitting resistance than standard duplex grades such as 2205. Its alloying includes elevated chromium (~25%), molybdenum (~3–4%), nickel (~6–7%), and nitrogen (≈0.2–0.3%), producing a Pitting Resistance Equivalent Number (PREN) that commonly exceeds 40. That chemical balance gives 2507 exceptional durability in chloride-rich environments while retaining good toughness and pressure-vessel capability at ambient temperatures.

Key mechanical and metallurgical properties

We summarize the attributes most important for engineering selection:

• Strength: Yield strength typically ~450–620 MPa (varies with cold work and heat treatment), tensile strength commonly 750–900 MPa for mill-plate conditions.

• Ductility / toughness: Acceptable toughness at ambient and moderately low temperatures; avoid prolonged service above ~300 °C to prevent phase embrittlement.

• Microstructure: Duplex microstructure (ferrite + austenite) that yields high strength with acceptable toughness; careful control of cooling / post-weld treatments is required to avoid sigma phase and other embrittling precipitates.

• Thermal behavior: Lower coefficient of thermal expansion and higher thermal conductivity than austenitic stainless steels — advantageous for some heat-exchanger applications.

• PREN: Typical PREN > 40 (PREN = %Cr + 3.3×%Mo + 16×%N), making it well suited to seawater and chloride-bearing chemistries.

Corrosion resistance profile and critical environments

2507 is chosen where resistance to localized corrosion and stress corrosion cracking is essential:

• Marine and subsea: Excellent resistance to pitting and crevice corrosion in seawater, making it common for offshore risers, manifolds, and umbilicals.

• Desalination: Components exposed to concentrated brines and intermittent chlorides.

• Chemical process: Vessels and piping handling chlorides, acids (depending on concentration/temperature) and other aggressive media.

• Oil & gas: Suitable for many topside and subsea applications, though specific H2S/CO2 environments require careful metallurgy and corrosion assessment.
  Performance depends on temperature, chloride activity, presence of oxidants, and fabrication condition; we always advise application-specific corrosion testing or consulting with metallurgists for extreme services.

Typical specifications, standards and product forms

Common references and shapes:

• Standards / specs: ASTM A240 (plates), UNS S32750 / WNR 1.4410 / EN equivalents, sometimes A182 (for forgings) and various ASTM testing protocols.

• Forms: Hot-rolled plate, cold-rolled sheet, coils, plates cut to size, forgings, bars, and welded fabrications.

• Surface finishes: 2B mill finish, pickled and passivated, polished finishes and special mill treatments for low carbon / controlled nitrogen.

• Thickness and sizes: Standard mill plates from a few mm to large sections (10–100+ mm) depending on mill capability; wide plates and heavy plates are commonly available from stockists or by mill order.

2025 market pricing — global snapshot and comparison table

Market pricing for 2507 plate in 2025 shows notable spread due to region, order size, certification level, and supply constraints. The table below gives representative ranges we observe from multiple suppliers and market listings; treat these as indicative FOB / factory prices, not landed project quotes.

How to read this table. The left column is where the product is offered from; the price shown is the factory/FOB or merchant rate noted publicly in 2025 listings and dealer pages. Very small cut orders, specialized mill certificates (e.g., EN 10204 3.1/3.2), heavy testing (charpy/tensile), or surface treatments will push each figure to the upper end. We recommend requesting an itemized quote that separates base metal, certification, testing, and logistics so you can compare like-for-like.

What drives price: raw materials, processing, certification, and supply chain

Several factors materially change the per-tonne price:

1. Nickel, chromium, and molybdenum commodity costs — 2507 has high levels of Ni, Cr and Mo; alloy surcharges or market nickel and molybdenum spikes rapidly affect quotes. We monitor alloy surcharges published by major mills and adjust pricing accordingly.

2. Order quantity and MOQ — mills give better unit pricing for larger tonnages; small orders or cut-length pieces carry premium processing fees.

3. Thickness and product form — heavy plates are more expensive per ton to produce because of longer rolling and heat-treatment cycles; specially rolled thick plates may be constrained by mill capability.

4. Certification and test requirements — 3.1/3.2 mill test certificates, PMI testing, and third-party inspection add cost and time.

5. Origin and trade barriers — tariffs, export controls, or shipping congestion affect landed cost more than base TON price.

6. Lead time and stock availability — in tight markets, stocked material or "air freight" delivery attracts a premium.

Purchasing best practices — what we check when quoting and inspecting

When we prepare or evaluate a quote for 2507 plate, we methodically verify:

• Exact grade and standard (UNS S32750 / SAF-2507 / EN 1.4410 / ASTM A240) — don’t accept ambiguous grade names.

• Mill test reports — ensure the certificate lists chemical composition, mechanical test results and heat numbers. For pressure or subsea service insist on EN 10204 3.1 or 3.2 as required.

• Traceability — heat numbers must link to test reports; raw material origin should be disclosed for critical projects.

• Surface condition & finish — specify mill finish, pickling, passivation or required post-fabrication treatments.

• Non-destructive testing (NDT) — if the application is critical, include ultrasonic or PMI checks and record acceptance criteria.

• Welding consumables specification — if you need welded assemblies, clarify compatible filler metals and procedures.

• Delivery terms — FOB, EXW, CIF, DDP, and whether packaging for sea shipment or export documentation is included.
  A carefully detailed Purchase Order prevents hidden costs and quality surprises.

Fabrication, welding and heat-treatment notes for fabricators

We advise fabricators and weld shops on these points:

• Welding: Use matched or approved filler metals (typically super duplex or duplex fillers with comparable PREN). Preheat is generally low; interpass temperatures should be controlled to avoid sigma formation. Post-weld solution annealing is rarely practical on completed fabrications — instead control heat input and use qualified procedures.

• Machinability: 2507 is tougher than austenitic grades; tool selection, slower feeds, and effective coolant are recommended; expect higher tool wear.

• Forming: Cold forming is limited compared to softer stainless steels; follow recommended bend radii and consider stress relief strategies.

• Heat treatment: Solution anneal if required to recover properties, but beware distortion for finished parts. Extended exposure to 300–600 °C may reduce toughness due to intermetallic precipitation.

• Passivation: Final pickling and passivation are typically performed to restore corrosion resistance after fabrication.
  We insist that fabricators use qualified welding procedures and maintain welding logs and PWHT records where specified.

Logistics, lead times and packaging considerations

• Typical lead times: Stock material can ship in a few days to weeks; mill orders commonly take several weeks to months depending on capacity and thickness. Express delivery reduces lead time at high cost.

• Packaging: Sea-worthy packaging, wooden skids and corrosion inhibitors are standard; for export we recommend sealed packaging and desiccants for long voyages.

• Shipping cost drivers: Weight, dimensions, special handling (heavy plates), and any oversized cargo rules, plus current freight market conditions.

• Insurance and inspections: Pre-shipment inspection (PSI) and third-party testing increase confidence but also cost and time; include these in tender comparisons.

Quality assurance, traceability and tests we require

For project scopes where 2507 is specified we commonly require:

• Full chemical analysis (heat and product level).

• Mechanical testing: tensile, yield, elongation and sometimes Charpy impact tests.

• NDT: ultrasonic testing (UT) for full plates if indicated, PMI on heat numbers for alloy confirmation.

• Mill certificates: EN 10204 3.1/3.2 when independent verification is contractually required.

• Certification of compliance to relevant standards (ASTM/EN).

• Documentation of mill heat treatment cycles and solution annealing conditions where applicable.
  By making these items explicit in tender documents, owners avoid surprises during manufacturing and commissioning.

Environmental considerations and recyclability

• 2507 is recyclable and contains high amounts of chromium and nickel, which have established recycling routes. Recycled stainless content reduces embodied carbon versus primary metal but prices are still strongly linked to primary alloy commodity markets.

• Select designs to minimize scrap (nesting optimization) and salvage high-value offcuts for return to authorized recyclers.

• For projects targeting sustainability credentials, request cradle-to-gate or supplier environmental declarations that document recycled content and energy footprint.

Frequently asked questions (FAQs)

Q1: How does 2507 compare to 2205 in strength and corrosion resistance?
A: 2507 has substantially higher yield and tensile strength and a significantly higher PREN than 2205, giving improved pitting and crevice resistance in chloride environments. For many subsea and highly corrosive process streams, 2507 is specified where 2205 would be marginal.

Q2: Is 2507 suitable for welding without post-weld heat treatment (PWHT)?
A: Yes — with qualified procedures and matched filler metals it is routinely welded without full PWHT. However, control of heat input and interpass temperature is essential to prevent formation of deleterious phases. For critical pressure components, discuss requirements with the certifying body.

Q3: Why do prices for 2507 vary so much between suppliers?
A: Variability stems from commodity metal surcharges (Ni, Mo, Cr), quantity, thickness, certification level, mill of origin, and local taxes or duties. Small cut orders and rapid delivery options carry premiums.

Q4: What certificates should I insist on for offshore equipment?
A: Require EN 10204 3.1 or 3.2 mill test certificates, full chemical and mechanical test data tied to heat numbers, and third-party inspection or witness testing for critical components.

Q5: Can 2507 be used for continuous high-temperature service?
A: Not recommended for continuous service above approximately 300 °C; prolonged exposure in the 300–600 °C window can cause intermetallic precipitation that reduces toughness. For elevated temperature applications consult a metallurgist to assess microstructural stability.