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■ Super Duplex A182 F53, A182 F55, A890 Gr. 5A and A890 Gr. 6A -- material overview ■
Grupo Compás generally holds super duplex A182 F53, A182 F55, A890 Gr. 5A and A890 Gr. 6A gate, globe, check, ball and butterfly valves.
Alloy SAF 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 nitrogen levels provide excellent resistance to pitting, crevice, and general corrosion.
Standards
ASTM/ASME A240 - UNS S32750
EURONORM 1.4410 - X2 Cr Ni MoN 25.7.4
AFNOR Z3 CN 25.06 AzGeneral Properties
Alloy SAF 2507 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 nitrogen levels provide excellent resistance to pitting, crevice, and general corrosion.The impact strength is also high. Alloy SAF 2507 is not recommended for applications which require long exposures to temperatures above 570°F because of the risk of a reduction in toughness.
Applications
• 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
General Corrosion Resistance
The high chromium and molybdenum content of SAF 2507 makes it extremely resistant to uniform corrosion by organic acids like formic and acetic acid. SAF 2507 also provides excellent resistance to inorganic acids, especially those containing chlorides.In dilute sulphuric acid contaminated with chloride ions, SAF 2507 has better corrosion resistance than 904L, which is a highly alloyed austenitic steel grade specially designed to resist pure sulphuric acid.
Stainless steel of type 316L (2.5%Mo) cannot be used in hydrochloric acid due to the risk of localized and uniform corrosion. However, SAF 2507 can be used in dilute hydrochloric acid.
Intergranural Corrosion
SAF 2507's low carbon content greatly lowers the risk of carbide precipitation at the grain boundaries during heat treatment; therefore, the alloy is highly resistant to carbide-related intergranular corrosion.Stress Corrosion Cracking
The duplex structure of SAF 2507 provides excellent resistance to chloride stress corrosion cracking (SCC). Because of its higher alloy content, SAF 2507 is superior to 2205 in corrosion resistance and strength. SAF 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. The data above were measured by an electrochemical technique based on ASTM G 61. The critical pitting temperatures (CPT) of several high-performance steels in a 1M sodium chloride solution were determined. The results illustrate the excellent resistance of SAF 2507 to pitting corrosion. The normal data spread for each grade is indicated by the dark gray portion of the bar.Crevice Corrosion
The presence of crevices, almost unavoidable in practical constructions and operations, makes stainless steels more susceptible to corrosion in chloride environments. SAF 2507 is highly resistant to crevice corrosion. The critical crevice corrosion temperatures of SAF 2507 and several other high-performance stainless steels are shown above.Mechanical and Physical Properties
SAF 2507 combines high tensile and impact strength with a low coefficient of thermal expansion and high thermal conductivity. These properties are suitable for many structural and mechanical components. The low, ambient, and elevated temperature mechanical properties of SAF 2507 sheet and plate are shown below. All of the test data shown are for samples in the annealed and quenched condition.SAF 2507 is not recommended for applications which require long exposures to temperatures in excess of 570°F because of the increased risk of a reduction in toughness. The data listed here are typical for wrought products and should not be regarded as a maximum or minimum value unless specifically stated.
Hot forming
SAF 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 SAF 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 SAF 2507 than on an austenitic stainless steel. When forming requires more than 10% cold deformation, a solution anneal and quench are recommended.Heat Treatment
SAF 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
SAF 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 SAF 2507 because it will produce the appropriate duplex weld structure.
Preheating of SAF 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% N 2 /10% H 2 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.Comparative Standards:
EN/DIN
• 1.4501
• X2CrNiMoCuWN25.7.4
AFNOR
• Z3CND25.06Az
UNS
• S32760
AISI
• F55 (A182 / A276 / A479)
GOST • 12Kh13
NORSOK
• M630 MDS D57 BAR
• M630 MDS D54 FORGINGS
• M630 MDS D55 PLATE
• M630 MDS D56 CASTINGS
• M650 Qualification of Manufacturer
OTHER
• NACE MR01-75
• ISO 15156
• EN 10088-3
• PED 97/23/EC
• ASTM G48 Method A
• ASTM A751 COMPOSITION
• ASTM A388 U/T
• API 6A - PSL 4
Similar to UNS S32550 / S32520 / FERRALIUM 255-SD50 /UNS S32750 / AISI-F53 / 1.4410 / Z3CNDU25.07Az / X2CrNiMoCuN25.6.3/ 1.4507/ Uranus 52N / SAF 25.07 SANMAC
For quotations or further information about our products, please contact Heather Smith (International eCommerce) by phone +34 93 435 1672 or by email: alloy-valves@alloy-valves.com
■ A182 F61, A182 F91, A182 F321, A182 F347, A182 F347H, A182 F44, Duplex A182 F51, Duplex 1.4462, Duplex 1.4470, Duplex UNS S31803, Duplex UNS S32205, Super Duplex UNS S32750, Super Duplex UNS S32760, Super Duplex 1.4501, Super Duplex 1.4410, Super Duplex 1.4507, Ferralium 255, Super Duplex A182 F53, Super Duplex A182 F55, A182 F91, 254 SMO, 6moly, 6mo, Duplex A995 Gr. 4A CD3MN, Duplex A890 Gr. 4A CD3MN, Duplex 2205, Super Duplex A890 Gr. 5A CEMN, Super Duplex A890 Gr. 6A CD3MWCUN, Alloy 20, Carpenter 20, A351 CN7M, A20 UNS 08020, Titanium A182 316Ti, Titanium Gr. 2, Titanium-Palladium Gr. 7, B367 Gr. 2, B381 Gr. II, UNS N08020, Monel 400, Monel K500, Monel A494 M35-1, Monel UNS N04400, Avesta 904L, Inconel A494-CY40, Inconel 600, Inconel 625, Inconel UNS N06600, Inconel UNS N06625, Incoloy 800, Incoloy 800H, Incoloy 800HT, Incoloy 825, Incoloy UNS N08800, Incoloy UNS N08825, Hastelloy C276, Hastelloy C22, Hastelloy B3, Hastelloy A494 CW12MW, A182 F5, A182 F22, A216 WC6, A216 WC9, A217 C5, A182 F11, A351 CG8M, Aluminium Bronze Valves■
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Grupo Compás. Barcelona. Spain..Tlf.: (+34) 93 435 1672...Fax: (+34) 93 550 4076.. Email: alloy-valves@alloy-valves.com
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