2205 Duplex Stainless Steel Pipe: Properties, Price & Supplier

2205 duplex stainless steel pipe: A Practical Buying Guide

Looking for a reliable 2205 duplex stainless steel pipe supplier? Huaxiao Stainless keeps 100,000 tons of inventory, ships in 15 days, and is certified to ISO/TS16949. Before you request a quote, here is what actually matters when specifying and sourcing 2205 duplex stainless steel pipe.

Why Choose 2205 Duplex Stainless Steel Pipe

2205 duplex stainless steel pipe is a roughly 50/50 mix of austenite and ferrite. That microstructure is the trick: it gives roughly twice the yield strength of 304 or 316 while resisting chloride pitting and crevice corrosion far better (PREn about 34-35). For seawater, brine and many chemical streams, duplex lets you specify a thinner wall for the same pressure – and a lower material cost than super-austenitic or 6Mo grades.

2205 (UNS S31803 / S32205) sits between standard 316 and super-duplex 2507. It is the default choice when 316 keeps pitting but the budget cannot stretch to 2507, and it is weldable with careful procedure (controlled heat input, no preheat, proper filler).

Specifications, Sizes & Surface Finish

We supply 2205 (UNS S32205) pipe to ASTM A789 / A790 as both seamless and welded. OD runs from 1/2″ to 24″ (21.3 mm to 610 mm), in schedules SCH 5S, 10S, 40S, 80S and 160. Wall thickness spans 1.0 mm to 30 mm.

• Structure: ferrite balance 35-65% (verified by ferrite scope / PMI)
• Finish: pickled and passivated, or sand-blasted; polished on request
• Length: 6 m standard, up to 12 m or cut to order
• Testing: hydrostatic, ultrasonic, PMI and ferrite measurement on every heat

Typical chemistry: Cr 22%, Ni 4.5-6.5%, Mo 3.0-3.5%, N 0.14-0.20%. Yield strength ~450 MPa minimum – roughly double 316.

2205 Duplex Stainless Steel Pipe Price Factors

The 2205 duplex stainless steel pipe price per kg sits above 316 (because of higher Cr/Mo/N) but well below 2507 super-duplex or 6Mo. The real saving is structural: at ~2x the yield strength you often drop a schedule or two, so the installed cost per metre can beat 316 despite the higher per-kg price.

• Grade premium: duplex vs 316 is the biggest single swing
• Diameter/schedule: heavy walls and small bores carry a premium
• Form: seamless costs more than welded for the same size
• Testing: PMI + ferrite scope + UT add processing cost but are essential

Give us the bore, schedule and service fluid and we will quote the thinnest safe wall to cut both weight and cost.

Common Applications

2205 pipe is specified for desalination and seawater intake lines, heat-exchanger and condenser tubing, pulp-and-paper bleach plants, chemical-process and flue-gas-scrubber piping, offshore topsides and risers, brine and chloride service, bridges and structural members in corrosive zones, and any line where 316 pits but 2507 is over-budget.

How to Choose a Reliable Supplier

Duplex has one unique failure mode: bad ferrite balance. If the ferrite is outside 35-65% the pipe loses both toughness and corrosion resistance, so a ferrite scope reading on the heat is non-negotiable. Also confirm PREn from the chemistry, demand full PMI, and check the weld procedure if you will fabricate on site.

A dependable 2205 duplex stainless steel pipe supplier provides ferrite scope, PMI and mill certificate up front. Huaxiao Stainless holds 100,000 tons of stainless inventory, dispatches within 15 days, and operates under ISO/TS16949 with full traceability on every heat.

Frequently Asked Questions About 2205 duplex stainless steel pipe

Get a Quote for 2205 duplex stainless steel pipe

2205 duplex stainless steel pipe in stock: 100,000 tons available, 15-day delivery, certified to ISO/TS16949. Browse our 2205 duplex stainless steel pipe product page or contact us for a quote to get a competitive price today.