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Wholesale Price Concentric Reducer Stainless Steel Duplex Steel 2507 S32750 F53 Sch10 Ansi
Product name | 2507(UNS S32750) Duplex Stainless Steel fittings |
Standard | ASTM A789,A790,A450,A530,GB/T14976,GB/T14975,GB/T13296,etc |
Tolerance | a) Outer Diameter: +/- 0.2mm b) Thickness: +/- 0.02mm c) Length: +/- 5mm |
Surface | Picked, polished |
Specification | 1).Heat exahanger tube for petrochemical,chemical and ocean
development 2).Industrial furnace and heater tubes 3).for gas turbine and prochemical processing 4).Condenser tubes,sulfuric and phosphoric acids tubes,API tubing 5).Construction and ornament 6).Acid production,waste incineration,FGD,paper processing industrial etc |
Material | Alloy : Alloy 20/28/31; Hastelloy: Hastelloy B / B-2/B-3/C22/C-4/S/
C276/C-2000/G-35/G-30/X/N; 600 series: 13-8ph,15-5ph,17-4ph,17-7ph(630,631),660A/B/C/D, Duplex: 2205(UNS S31803/S32205),2507(UNS S32750),UNS
S32760,2304,LDX2101.LDX2404,LDX4404,904L |
Delivery conditions | Cold Drawn and annealed |
Note | We can produce other standard as the customers’ requirement. |
General Properties
Duplex Stainless Steel 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 2507 is not recommended for applications which require long exposures to temperatures above 570F because of the risk of a reduction in toughness.
Standards
ASTM/ASME .......... A240 - UNS S32750
EURONORM............ 1.4410 - X2 Cr Ni MoN 25.7.4
AFNOR.................... Z3 CN 25.06 Az
Corrosion Resistance
General Corrosion
The high chromium and molybdenum content of 2507 makes it extremely
resistant to uniform corrosion by organic acids like formic and
acetic acid. 2507 also provides excellent resistance to inorganic
acids, especially those containing chlorides.
In dilute sulfuric acid contaminated with chloride ions, 2507 has better corrosion resistance than 904L, which is a highly alloyed austenitic steel grade specially designed to resist pure sulfuric 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, 2507 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
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 2507 provides excellent resistance to
chloride stress corrosion cracking (SCC). Because of its higher
alloy content, 2507 is 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. 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 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
susceptable to corrosion in chloride enviroments. 2507 is highly
resistant to crevice corrosion. The critical crevice corrosion
temperatures of 2507 and several other high-performance stainless
steels are shown above.
Chemical Analysis
Typical values (Weight %)
C Cr Ni Mo N Others
0.020 25 7 4.0 .27 S=0.001
PREN = [Cr%] + 3.3 [Mo%] + 16 [N%] ≥ 40
Mechanical Properties
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 2507 sheet and plate are shown below. All of the test
data shown are for samples in the annealed and quenched condition.
2507 is not recommended for applications which require long exposures to temperatures in excess of 570F 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.
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.
Hot forming
2507 should be hot worked between 1875F and 2250F. This should be
followed by a solution anneal at 1925F 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
1925F. 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 300F 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.
Chemical Composition
Grade | C max | Si max |
Mn max | P max | S max | Cr | Ni | Mo | N | Cu |
S32750 | 0.030 | 0.8 | 1.2 | 0.030 | 0.015 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | 0.5max |
Physical Properties
Grade | Y.S.MPa min | T.S.Mpa min | Elongation % | Hardness HRC |
S32750 | 550 | 800 | 15 | 31 |
Speciality and advantages: