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Super Duplex Plate 2507

Super Duplex Plate 2507
Super Duplex Plate 2507
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Product Code : 99
Product Description

Super Duplex Plate 2507 DUPLEX 2507 GRADE

Duplex 2507 (UNS S32750) is a super duplex stainless steel with 25% chromium, 4% molybdenum, and 7% nickel designed for demanding applications which require exceptional strength and corrosion resistance, such as chemical process, petrochemical, and seawater equipment. The steel has excellent resistance to chloride stress corrosion cracking, high thermal conductivity, and a low coefficient of thermal expansion. The high chromium, molybdenum, and nickel levels provide excellent resistance to pitting, crevice, and general corrosion.

Applications OF Duplex 2507:

  • Oil and gas industry equipment
  • Offshore platforms, heat exchangers, process and service water systems, fire-fighting systems, injection and ballast water systems
  • Chemical process industries, heat exchangers, 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

EQUIVALENT GRADES OF DUPLEX 2507:


COUNTRY




EUROPEAN


GERMANY

STANDARDS

ASTM

UNS

EURONORM

EN

ISO

DIN

GRADE

A240

S32750

X2CrNiMoN25.7.4

1.4410

4410-327-50-E

1.4410



COUNTRY

FRANCE

SWEDEN


STANDARDS

NF

SS

AISI

GRADE

Z3CND25.07Az

2328

F53 (A182/ A479)


Characteristics of Duplex 2507:

  • High resistance to chloride stress corrosion cracking
  • High Strength
  • Superior resistance to chloride pitting and crevice corrosion
  • Good general corrosion resistance
  • Suggested for applications up to 600° F
  • Low rate of thermal expansion
  • Combination of properties given by austenitic and ferritic structure
  • Good weldability and workability

CORROSION RESISTANCE:

General Corrosion

  • High chromium and molybdenum content of 2507 makes it extremely resistant to uniform corrosion by organic acids like formic and acetic acid.
  • Provides excellent resistance to inorganic acids, especially those containing chlorides.can be used in dilute hydrochloric acid.
  • Pitting need not be a risk in the zone below the borderline in this figure, but crevices must be avoided.

Intergranural Corrosion

  • Low carbon content greatly lowers the risk of carbide precipitation at the grain boundaries during heat treatment.
  • Is highly resistant to carbide-related intergranular corrosion.

Stress Corrosion Cracking

  • Duplex structure of 2507 provides excellent resistance to chloride stress corrosion cracking (SCC).
  • Superior to 2205 in corrosion resistance and strength.
  • 2507 is especially useful in offshore oil and gas applications and in wells with either naturally high brine levels or where brine has been injected to enhance recovery.

Pitting Corrosion

Different testing methods can be used to establish the pitting resistance of steels in chloride-containing solutions.

Crevice Corrosion

Highly resistant to crevice corrosion.

PROCESSING

Hot forming2507 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 FormingMost 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 Treatment2507 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.

Welding2507 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.

CHEMICAL PROPERTIES:

Typical values (Weight %)

C

Cr

Ni

Mo

N

Others

0.020

25

7

4.0

.27

S=0.001

Mechanical Properties:

Ultimate Tensile Strength, ksi

116 min.

0.2% Offset Yield Strength 0.2%, ksi

80 min.

0.1% Offset Yield Strength 0.2%, ksi

91 min.

Elongation in 2 inches, %

15 min.

Hardness Rockwell C

32 max.

Impact Energy, ft.-lbs.

74 min.

Physical Propertries

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

-in x 10-6

31.5



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