Duplex2507 stainless steel 1.4410（UNS32750）

What is Duplex2507 nerez?

Duplex 2507 (US S32750) is a super duplex stainless steel with 25% chrom, 4% molybden, a 7% nikl navržený pro náročné aplikace, které vyžadují výjimečnou sílu a odolnost proti korozi, například chemický proces, petrochemický, a vybavení mořské vody. Ocel má vynikající odolnost vůči praskání koroze chloridu, vysoká tepelná vodivost, a nízký koeficient tepelné roztažnosti. The high chromium, molybden, and nickel levels provide excellent resistance to pitting, crevice, and general corrosion.

Super duplex 2507 stainless steel 1.4410 Products Form

• Flanges (Socket Weld, Weld Neck, Závitu, Blind, Orifice, Slip on, Lap Joint)
• Wire
• Bar
• Talíř
• Fittings (returns, blinds, pipe nipples, potrubí, caps, tees, weld-necks, stub-ends, elbows, reducers, long welding necks, crosses, tube fittings)
• Sheet
• Pipe & Trubice (svařované & bezproblémový)

Applications for Duplex2507 nerez

• Oil and gas industry equipment
• Offshore platforms, výměníky tepla, process and service water systems, fire-fighting systems, injection and ballast water systems
• Chemical process industries, výměníky tepla, vessels, and piping
• Desalination plants, high pressure RO-plant and seawater piping
• Mechanical and structural components, high strength, corrosion-resistant parts
• Power industry FGD systems, utility and industrial scrubber systems, absorber towers, ducting, and piping

Equivalents of grade 2507

EU V	USA –	Francie Afnor	Švédsko Ss
X2CrNiMoN25-7-4	S32750	Z3CND25-06Az	2328

Composition ranges for 2507 grade of stainless steel

1.4410 Super duplex Chemické složení StupeňCNMoCrV1.4410 (S32750 – F53)%0.03 Max%0.24 – 0.32%3 – 5%24 – 26%6 – 8

Mechanické vlastnosti

Temper	Annealed
Tensile Rm	115	KSI (min)
Tensile Rm	800	MPa (min)
R.p. 0.2% Yield	80	KSI (min)
R.p. 0.2% Yield	550	MPa (min)
Prodloužení (2” or 4D gl)	15	% (min)

Fyzikální vlastnosti

Konkrétní teplo (0-100°C)	500	J.kg-1.°K-1
Thermal Conductivity	15	W.m -1.°K-1
Thermal Expansion	11	mm/m/°C
Modulus Elasticity	200	GPa
Electrical Resistivity	8.12	μohm/cm
Hustota	7.8	g/cm3

Corrosion Resistance

32750 has excellent general corrosion resistance, superior to virtually all other stainless steels. It has

high resistance to intergranular corrosion and very high resistance to stress corrosion cracking in

both chloride and sulphide environments. It is the grade of choice for severe high temperature

marine environments and for chemical and petrochemical processing, even including some

solutions of strong acids.

Tepelné zpracování

2507 by mělo být roztok žíhané a zhášené po vytvoření horkého nebo studeného. Solution annealing should be done at a minimum of 1925°F. Žíhající by mělo být okamžitě dodržováno rychlým zhášením vzduchu nebo vody. Získat maximální odolnost proti korozi, Tepelně ošetřené výrobky by měly být nakládány a propláchnuty.

Hot working

2507 should be hot worked between 1875ºF and 2250ºF. This should be followed by a solution anneal at 1925ºF minimum and a rapid air or water quench.

Cold working

Většinu metod vytváření nerezové oceli lze použít pro práci na studeném chladu 2507. Slitina má vyšší výnosovou sílu a nižší tažnost než austenitické oceli, takže výrobci mohou zjistit, že síly vyšších formování, zvýšený poloměr ohýbání, a zvýšená příspěvek pro Springback je nezbytný. Hluboký kresba, Stretch Formoring, a podobné procesy jsou obtížnější provádět 2507 než na austenitické nerezové oceli. Při formování vyžaduje více než 10% deformace studené, Doporučujeme se žíhání a zhádření řešení.

Welding

2507 possesses good weldability and can be joined to itself or other materials by shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), plasma arc welding (PAW), flux cored wire (FCW), or submerged arc welding (SAW). 2507/P100 filler metal is suggested when welding 2507 because it will produce the appropriate duplex weld structure.

Preheating of 2507 is not necessary except to prevent condensation on cold metal. The interpass weld temperature should not exceed 300°F or the weld integrity can be adversely affected. The root should be shielded with argon or 90% N2/10% H2 purging gas for maximum corrosion resistance. The latter provides better corrosion resistance.

Key Benefits of Duplex2507 Stainless Steel

Duplex2507 stainless steel offers numerous benefits for industrial applications. Its combination of strength and corrosion resistance is unmatched by many other materials. These properties ensure reliability under challenging conditions.

The alloy’s cost-effectiveness is another advantage. Despite its excellent performance, it is more affordable than many nickel-based alternatives. This makes it an attractive option for budget-conscious projects.

Here are some key benefits of Duplex 2507:

• High strength-to-weight ratio
• Excellent oxidation resistance
• Resistance to fatigue and abrasion

Fabrication and Handling Considerations

Important considerations include:

• Using specific welding techniques
• Controlling heat treatment processes
• Following industry standards

These practices help preserve the steel’s corrosion resistance and mechanical strength. Proper handling ensures durability and performance in demanding applications.

Conclusion

Duplex2507 stainless steel is a remarkable material known for its strength and corrosion resistance. It plays a vital role in challenging environments, offering durability and cost-effectiveness. For engineers and builders, it stands as a reliable choice for various demanding applications.