A312 A999 UNS S31254 Super Duplex Stainless Steel Pipe
Brand Name:TOBO/TPCO/TISCO/VALIN/METAL
Certification:ISO/PED/TUV/SGS/LR/BV
Model Number:Seamless PIPE
Minimum Order Quantity:20 pcs
Delivery Time:Within 7-10 days
Payment Terms:D/A, D/P, T/T, Western Union, MoneyGram
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Product Details
Seamless Austenitic Stainless Pipe A312 A999 UNS S31254 ASME ANSI Alloy Steel Titanium
FEATURES
S31254 is a high performance austentic stainless steel. Its high alloying elements content imparts excellent resistance to uniform, pitting and crevice corrosion, and stress cprrosion cracking, It was riginally developed to withstand the corrosion of acids, especially in the presence of halide ions, such as hydrochloric acid, hydrochloric acid, phosphoric acid, and sulphuric acid contaminated with chlorides. In certain environments it is an alternative to more expensive Alloy alloys and titanium alloys.
APPLICATIONS
Chemical processing equipment, plup and paper industr bleachin equipment, desalination plant seawater piping, food and beverage industry, pharmaceuticals, and hydrometallurgy.
| Product name | 31254 Duplex Stainless Steel Pipe |
| 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
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.
A312 A999 UNS S31254 Super Duplex Stainless Steel Pipe
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