Technical center

UNS32750 Super duplex stainless steel seamless pipe


A: Grade and production size range

2507 / S32750 / X2CrNiMoN25-7-4/ 2328/ 1.4410

OD  Φ6mm~Φ860mm,Thickness 1mm~60mm

B: Features:

1.     An austenitic-ferritic super duplex stainless steel with nitrogen.

2.     High resistance to stress corrosion cracking in environments containing hydrogen sulfide or chloride-bearing environments

3.     Excellent resistance to spot corrosion, gap corrosion and uniform corrosion, high resistance to erosion corrosion and corrosion fatigue

4.     Good weldability, good hot-working properties because of good physical properties and very high mechanical strength

5.     Application for mechanical and structural components that require both high strength and high corrosion resistance and burning (waste) gas purification equipment. 

C: Chemical composition(%):

C≤0.03     Si≤0.8       Mn≤1.2     P≤0.035    S≤0.002     NI 6.0-8.0 

Cr 24-26    Mo 3.0-3.5   N 0.24-0.32   Cu≤0.5      Fe balance

D: Mechanical properties:

Tensile strength(Rm Mpa) ≥800

Yield strength(RP0.2 Mpa) ≥550

Elongation(%) ≥25

Hardness(HRC) ≤32

E: Standard:

ASTM A789/ASME SA789   ASTM A790/ASME SA790   EN 10216-5, NFA 49-217

F: Applications 

Oil and gas exploration
and production

Chloride-containing environments such as seawater handling and process systems. Hydraulic and process fluid tubes in umbilicals

Seawater cooling

Tubing for heat exchangers in refineries, chemical industries, process industries and other industries using seawater or chlorinated seawater as coolant

Salt evaporation

Evaporator tubing for production of corrosive salts, e.g. chlorides, sulfates and carbonates

Desalination plants

Pressure vessels for reverse osmosis units, tube and pipe for seawater transport, heat exchanger tubing

Geothermal wells

Heat exchangers in geothermal exploitation units, systems exposed to geothermal or high salinity brines, tubing and casing for production

Oil refining and petrochemical and gas processing

Tubes and pipes where the process environment contains a high amount of chlorides, or is contaminated with hydrochloric acid

Pulp and paper production

Material for chloride-containing bleaching environments

Chemical processing

Organic acid plants, also when process solutions are contaminated with e.g. chlorides

Mechanical components requiring high strength

Propeller shafts and other products subjected to high mechanical load in seawater and other chloride-containing environments

Desulfurization units

As reheater tubes in flue gas desulfurization systems. The good mechanical and corrosion properties make SAF™ 2507 an economical choice in many applications by reducing the life cycle cost of equipment.

About 2507 / S32750 / X2CrNiMoN25-7-4/ 2328/ 1.4410 Special

1, the PRE number (Pitting Resistance Equivalent) and The PRE is defined as, in weight-% PRE = %Cr + 3.3 x %Mo + 16 x %N

The minimum PRE-value is 41.

2, Solution annealing: Slow heating up to 1000°C (1830°F). Annealing at 1050-1125°C (1920-2060°F), followed by quenching.