UNS 32750 Super Duplex Stainless Steel Welded Tube And Pipe OD2-120mm

 

Alloy SAF2507 UNS S32750 is 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, highthermal conductivity, and a low coefficient of thermal expansion.

Super duplex grades have enhanced pitting and crevice corrosion resistance when compared with 300-series austeniticstainless steel or conventional duplex alloys. This can be attributed to the enhanced levels of chromium, molybdenum and nitrogen found in these materials. Alloy 2507 is the most common “super” duplex grade.

Usage of Duplex 2507 should be limited to applications below 6000 F (3160 C). Extended elevated temperature exposure can reduce both the toughness and corrosion resistance of alloy 2507.The high chromium, molybdenum, and nitrogen levels provide excellent resistance to pitting, crevice, and general corrosion.the duplex structure provides 2507 with exceptional resistance to chloride stress corrosion cracking.

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 saving in weight can reduce the overall cost of fabrication.

Super Duplex Corrosion Resistance, The high chromium and molybdenum content of Super Duplex makes it extremely resistant to uniform corrosion by organic acids like formic and acetic acid. Super Duplex also provides excellent resistance to inorganic acids, especially those containing chlorides.

•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 6000 F
•Low rate of thermal expansion
•Combination of properties given by austenitic and ferritic structure
•Good weldability and workability

Super Duplex Applications:
 

• Heat exchangers, tubes and pipes for production and handling of gas and oil,
• Heat exchangers and pipes in desalination plants,
• Mechanical and structural components,
• Power industry FGD systems,
• Pipes in process industries handling solutions containing chlorides,
• Utility and industrial systems, rotors, fans, shafts and press rolls where the high corrosion fatigue strength can be utilized,
• Cargo tanks, vessels, piping and welding consumables for chemical tankers.
• High-strength, highly resistant wiring. Product Information for 2507 Super Duplex stainless steel pipe

   

  	Sizes				Standard Tolerances
  Products	OD	Wall	Lengths and/or coils	Grades	OD	Wall	Lengths
  Pressure &Corrosion Tubing Meets or exceeds requirements forwelded Specification: ASTM-A789	1/16" (1.59 mm) to 4" (101.6 mm) Metric sizes available	0.010" (0.25 mm) to 0.220" (5.59 mm)	Random or cut lengths up to 40' (12.2 m) Coils to 1-1/2" OD	Super Duplex 2507	<1-1/2" (38.1 mm) ±0.005" (0.13 mm) 1-1/2" (38.1 mm) to 3" (76.2 mm) ±0.010" (0.25 mm) 3-1/2" (88.9 mm) to 4" (101.6 mm) ±0.015" (0.38 mm)	±10%	Randoms up to +2" (50.8 mm) Cuts +1/8" (3 mm) -0" Coils to 80,000' (24,384 m)
  Subsea Umbilical Tubing Specifications: ASTM-A789 and ASTM-A790	3/8" (9.53 mm) to 1-1/2" (38.1 mm)	0.039" (0.99 mm) to 0.125" (3.18 mm)	Cut lengths to 60' (18.3 m) Coils to 1-1/2" OD*	Super Duplex 2507	±0.005" (0.127 mm)	±10%	Coils to 80,000' (24,384 m)

  
  Physical Properties of Super Duplex 2507 Alloys in the Annealed Condition at -20°F to +100°F

  			Tensile Strength			Yield Strength
  Alloy	UNS	Spec.	psi	MPa	ksi	psi	MPa	ksi	Elongation in 2 in. (min.) %	Grain Size Req.	Max. Hardness	Modulus of Elasticity (x106 psi)	Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6)	Thermal Conductivity (BTU-in/ ft2-h-°F)
  SuperDuplex2507	S32950	A789,A790	100,000	690	100	70,000	485	70	20	—	30.5 Rc	—	—	—
  Super Duplex 2507	S32750	A789, A790	116,000	800	116	80,000	550	80	15	—	32 Rc	27.5	7.2	98

  
  Composition of Super Duplex 2507 stainless steel tube

  Grade	Super Duplex 2507
  UNS Designation	S32750
  Carbon (C) Max.	0.030
  Manganese (Mn) Max.	1.20
  Phosphorous (P) Max.	0.035
  Sulphur (S) Max.	0.020
  Silicon (Si) Max.	0.80
  Chromium (Cr)	24.0–26.0
  Nickel (Ni)	6.0–8.0
  Molybdenum (Mo)	3.0–5.0
  Nitrogen (N)	0.24–0.32
  Iron (Fe)	Bal.
  Copper (Cu)	0.50
  Other Elements	—

  
  |Super Duplex 2507 Product Range

  Alloy	UNS Designation	Werkstoff NR.	Specifications*
  Super Duplex 2507	S32750	1.4410	A/SA789, A/SA790

Standard:

ASTM/ASME A240 -UNS S32750

EURONORM: 1.4410-X2 CrNi MoN 25.7.4

AFNOR:23CN 25.06Az

Description:

Super Duplex Stainless Steel is a highly alloyed, good performance duplex steel with a pitting resistance. Super duplex offers good resistance to pitting and crevice corrosion.Super duplex is suited for use in aggressive environments. It has good resistance to stress corrosion cracking in chloride and sour environments and has good resistance to erosion corrosion and corrosion fatigue.

Application:

Oil and gas industry equipment.

Offshore platforms, heat exchangers,process and service water systems, fire-fighting systems, injection and ballast water system.

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 idustrial scrubber systems, absorber towers, ducting, and piping.

 

Chemical composition%

C	Cr	Ni	Mo	N	Others
0.020	25	7	4.0	27	S=0.001
Pren=(Cr%)+3.3(Mo%)+16(N%) not less than 40

Mechanical Performance:

Ultimate Tensile Strength, Ksi	116min
0.2%Offset Yield Strength 0.2%,Ksi	80min
0.1%Offset Yield Strength 0.2%,Ksi	91min
Elongation in 2 inches, %	15 min
Hardness Rockwell C	32 max
Impact Energy, ft.-lbs.	74min

 

Low Temperature Impact Properties:

Temperature 0F	RT	34	-4	-40
Ft -lbs	162	162	155	140
Temperature 0F	-76	-112	-148	-320
Ft -lbs	110	44	30	7

 

Elevated temperature Tensile Properties:

Temperature 0F	68	212	302	392	482
0.2%Offset Yield Strength,Ksi	80	65	61	58	55
Ultimate Tensile Strength, Ksi	116	101	98	95	94

 

Processing:

Hot forming

2507 should be hot worked between 18750F and 22500F. This should be followed by a solution anneal at 19250F 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 austentic 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 hot or cold forming solution annealing should be done at a minimum of 19250F. (1025-1125 centigrade) 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, gas tungsten arc welding, plasma arc welding, flux cored wire or submerged arc welding. 2507/P100 filler metal is suggested when welding 2507 because it will produce the appropriate duplex weld structure.