Duplex Stainless Steel

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Duplex Stainless Steel

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2507 Duplex Stainless Steel

Specifications:ASTM A240 / ASME SA240

Thickness:4mm-100mm

Width:1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc

Length:2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc

Surface:2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, checkered, embossed, hairline, sand

blast, Brush, etching, etc

Finish:Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA NO(8), SATIN (Met with Plastic Coated)

  • Description
  • Specification
  • Standard
  • Process
  • Packing

About Duplex 2507

Duplex 2507 is a super duplex stainless steel designed for applications which demand exceptional strength and corrosion resistance. Alloy 2507 has 25% chromium, 4% molybdenum, and 7% nickel. This high molybdenum, chromium and nitrogen content results in excellent resistance to chloride pitting and crevice corrosion attack and the duplex structure provides 2507 with exceptional resistance to chloride stress corrosion cracking.

Usage of Duplex 2507 should be limited to applications below 600° F (316° C). Extended elevated temperature exposure can reduce both the toughness and corrosion resistance of alloy 2507.

Duplex 2507 possesses excellent mechanical properties. Often a light gauge of 2507 material can be used to achieve the same design strength of a thicker nickel alloy. The resulting savings in weight can dramatically reduce the overall cost of fabrication.

Applications

(1)Oil and gas industry equipment

(2)Offshore platforms, heat exchangers, process and service water systems, fire-fighting systems, injection and ballast water systems

(3)Chemical process industries, heat exchangers, vessels, and piping

(4)Desalination plants, high pressure RO-plant and seawater piping

(5)Mechanical and structural components, high strength, corrosion-resistant parts

(6)Power industry FGD systems, utility and industrial scrubber systems, absorber towers, ducting, and piping

Super Duplex 2507 Plate Thickness (mm)

Super Duplex 2507 Plate Dimensions

1.5

3m x 1.5m

2.0

3m x 1.5m

3.0

3m x 1.5m

5.0

3m x 1.5m / 4m x 2m

6.0

3m x 1.5m / 4m x 2m / 6m x 2m

8.0

3m x 1.5m / 4m x 2m / 6m x 2m

10.0

3m x 1.5m / 4m x 2m / 6m x 2m

12.0

3m x 1.5m / 4m x 2m / 6m x 2m

15.0

4m x 2m / 6m x 2m

20.0

4m x 2m / 6m x 2m

Metric Dimensions

Surface finish

Thickness (mm)

Width (mm)

2B – Cold rolled, heat treated, pickled, skin passed

0.25–8.0

max. 2032

2D – Cold rolled, heat treated, pickled

0.4–6.35

max. 1524

2E – Cold rolled, heat treated, mechanically descaled

0.4–8.0

max. 2032

2R – Cold rolled, bright annealed

0.25–3.5

max. 1524

2H – Work hardened

0.4–6.35

max. 1524

Polished, brushed

0.5–4.0

max. 1524

Imperial Dimensions

Surface finish

Gauge (in)

Width (in)

2B – Cold rolled, heat treated, pickled, skin passed

10–24

max. 72*

2D – Cold rolled, heat treated, pickled

12–24

max. 60

BA Mexinox only

18–28

max. 48

Polished (not brushed)

11–24

max. 60

Temper rolled Mexinox only

13–29

max. 48

GRADE

 

EN

ASTM/UNS

UR™2507

EN 1.4410

X2CrNiMoN 25-7-4

S32750

UR™2507Cu

EN 1.4507

X2CrNiMoCuN 25-6-3

S32520/32550

UR™2507W

EN 1.4501

X2CrNiMoCuWN 25-7-4

S32760

Composition

S32750 / S32760

C

N

P

Si

Mn

Mo

Ni

Cr

S

Other

0.030

0.24/0.32

0.035

0.80

1.20

3.0/5.0

6.00/8.00

24.0/26.0

0.020

Cu:0.50

Mechanical Strength

S32750 / S32760

Density

Melting Point

Yield Strength (0.2%Offset)

Tensile Strength

Elongation

7.8 g/cm3

1350 °C (2460 °F)

Psi - 80000 , MPa - 550

Psi - 116000 , MPa - 800

15 %

Equivalent Material

STANDARD

UNS

WERKSTOFF NR.

Super Duplex S32750

S32750

1.4410

Super Duplex S32760

S32760

1.4410

Density

Density

lb/in3

0.28

Modulus of Elasticity

psi x 106

29

Coefficient of Thermal Expansion
68-212°F/°F

x10-6/°F

7.2

Thermal Conductivity

Btu/h ft °F

8.7

Heat Capacity

Btu/lb/°F

0.12

Electrical Resistivity

W-in x 10-6

31.5

Hot Forming

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

Cold Forming

Most of the common stainless steel forming methods can be used for cold working 2507. The alloy has a higher yield strength and lower ductility than the austenitic steels so fabricators may find that higher forming forces, increased radius of bending, and increased allowance for springback are necessary. Deep drawing, stretch forming, and similar processes are more difficult to perform on 2507 than on an austenitic stainless steel. When forming requires more than 10% cold deformation, a solution anneal and quench are recommended.

Heat Treatment

2507 should be solution annealed and quenched after either hot or cold forming. Solution annealing should be done at a minimum of 1925°F. Annealing should be followed immediately by a rapid air or water quench. To obtain maximum corrosion resistance, heat treated products should be pickled and rinsed.

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.

If welding is to be done on only one surface and post-weld cleaning is not possible, GTAW is suggested for root passes. GTAW or PAW should not be done without a filler metal unless post-weld cleanup is possible. A heat input of 5-38 kJ/in. should be used for SMAW or GTAW. A heat input of about 50kJ/in. can be used for SAW.

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