7/31/2019 Duplex Stainless Steel 2507-Spec-Sheet

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A 25Cr Duplex Stainless Steel

Specifcation Sheet: 2507 (UNS S32750)

2507 05/11 5000

Alloy 2507 is a super duplexstainless steel with 25% Chromium,4% Molybdenum, and 7% Nickeldesigned or demanding applicationswhich require exceptional strengthand corrosion resistance, such aschemical process, petrochemical,and seawater equipment. The steelhas excellent resistance to chloridestress corrosion and high thermalconductivity, with a low coecient othermal expansion. The high chromi-um, molybdenum, and nitrogen levelsprovide excellent resistance to pit-ting, crevice, and general corrosion.

The impact strength is also high.Alloy 2507 is not recommended orapplications which require longexposures to temperatures above570F because o the risk o areduction in toughness.

Applications Oil and gas industry equipment Offshore platforms, heat exchang-

ers, process and service watersystems, re-ghting systems,injection and ballast water systems

Chemical process industries, heatexchangers, vessels, and piping

Desalination plants, high pressureRO-plant and seawater piping

Mechanical and structuralcomponents, high strength,corrosion-resistant parts

Power industry FGD systems,utility and industrial scrubber

systems, absorber towers,ducting, and piping

Standards

ASTM/ASME ..A240 - UNS S32750

EURONORM .. 1.4410 - X2 Cr NiMoN 25.7.4

AFNOR............ Z3 CN 25.06 Az

Corrosion ResistanceGeneral Corrosion

The high chromium andmolybdenum content o 2507 make itextremely resistant to uniorm corro-

sion by organic acids like ormic andacetic acid. 2507 also providesexcellent resistance to inorganic acids,especially those containing chlorides.

In dilute suluric acid contaminatedwith chloride ions, 2507 has bettercorrosion resistance than 904L,which is a highly alloyed austeniticsteel grade specially designed toresist pure suluric acid.

Stainless steel o type 316L (2.5%Mo) cannot be used in hydrochloric aciddue to the risk o localized and uniorm corrosion. However, 2507 can be usedin dilute hydrochloric acid. Pitting need not be a risk in the zone below theborderline in this gure, but crevices must be avoided.

Intergranular Corrosion2507s low carbon content greatly lowers the risk o carbide precipitation

at the grain boundaries during heat treatment; thereore, the alloy is highlyresistant to carbide-related intergranular corrosion.

Stress Corrosion CrackingThe duplex structure o 2507 provides excellent resistance to chloride stress

corrosion cracking (SCC).Because o its higher alloy content, 2507 is superior to 2205 in corrosion

resistance and strength. 2507 is especially useul in oshore oil and gasapplications and in wells with either naturally high brine levels or where brinehas been injected to enhance recovery.

Pitting CorrosionDifferent testing methods can be used to establish the pitting resistance of

steels in chloride-containing solutions. The data above were measured by anelectrochemical technique based on ASTM G 61. The critical pittingtemperatures (CPT) of several high-performance steels in a 1M sodium chloride

solution were determined. The results illustrate the excellent resistance o 2507to pitting corrosion. The normal data spread or each grade is indicated by thedark gray portion o the bar.

Crevice CorrosionThe presence o crevices, almost unavoidable in practical constructions

and operations, makes stainless steels more susceptible to corrosion inchloride environments. 2507 is highly resistant to crevice corrosion.The critical crevice corrosion temperature o 2507 and several otherhigh-perormance stainless steels are shown above.

Isocorrosion curves, 0.1 mm/year, in suluricacid with an addition o 2000 ppm chloride ions

Isocorrosion curves, 0.1 mm/year, in hydrochloricacid. Broken line curve represents the boiling point

Critical Pitting Temperature (CPT) range forvarious alloys in 1M NACl

Critical Crevice Corrosion Temperature (CCT) orvarious alloys in 10% FeCl3

www.SandmeyerSteel.com

SANDMEYER STEEL COMPANYONE SANDMEYER LANE PHILADELPHIA, PA 19116-3598

800-523-3663 +1-215-464-7100 FAX +1-215-677-1430

Providing Solutions, With Materials andValue Added Products, for Process Industries

7/31/2019 Duplex Stainless Steel 2507-Spec-Sheet

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Mechanical Properties

Mechanical and Physical Properties2507 combines high tensile and impact strength with a low coecient o

thermal expansion and high thermal conductivity. These properties aresuitable or many structural and mechanical components. The low, ambient,and elevated temperature mechanical properties o 2507 sheet and plate areshown below. All o the test data shown are or samples in the annealed andquenched condition.

2507 is not recommended or applications which require long exposures totemperatures in excess o 570F because o the increased risk o a reductionin toughness. The data listed in this document are typical or wrought productsand should not be regarded as a maximum or minimum value unlessspecically stated.

Heat Treatment2507 should be solution annealed

and quenched ater either hot or coldorming. Solution annealing should bedone at a minimum o 1925F

Annealing should be ollowedimmediately by a rapid air or waterquench. To obtain maximum corro-sion resistance, heat treated productsshould be pickled and rinsed.

Welding2507 possesses good weldability

and can be joined to itsel or othermaterials by shielded metal arc weld-ing (SMAW), gas tungsten arc welding(GTAW), plasma arc welding (PAW),fux cored wire (FCW), or submergedarc welding (SAW). 2507/P100 llermetal is suggested when welding2507 because it will produce theappropriate duplex weld structure.

Preheating of 2507 is not neces-sary except to prevent condensationon cold metal. The interpass weldtemperature should not exceed 300F

or the weld integrity can be adverselyaected. The root should be shieldedwith argon or 90% N2/10% H2purging gas or maximum corrosionresistance. The latter provides bettercorrosion resistance.

I welding is to be done on onlyone surace and post weld cleaningis not possible, GTAW is suggestedfor root passes. GTAW or PAWshould not be done without a llermetal unless post weld cleanup ispossible. A heat input o 5-38 kJ/in.should be used for SMAW or GTAW.

A heat input o about 50kJ/in. can be

used or SAW.NOTE

2205 Code Plus Two is a registeredtrademark of Outokumpu Stainless AB, Inc. 254SMO and 654 SMO are registered trademarks ofOutokumpu Stainless AB.

This technical data and inormationrepresents our best knowledge at the time oprinting. However, it may be subject to someslight variations due to our ongoing researchprogram on corrosion resistant grades.

We, thereore, suggest that inormation beveried at time o inquiry or order. Furthermore,in service, real conditions are specic or eachapplication. The data presented here is only orthe purpose o description and may only beconsidered as guarantees when our Companyhas given ormal written approval.

SANDMEYERSTEEL COMPANY

Chemical AnalysisTypical Values (Weight %)

C Cr Ni Mo N Others

0.020 25 7 4.0 0.27 S = 0.001

PREN = [Cr %] + 3.3 [Mo %] + 16 [N %] 40

Ultimate Tensile Strength, ksi 116 min.

0.2% Offset Yield Strength, ksi 80 min.

1% Offset Yield Strength, ksi 91 min.

Elongation in 2 inches, % 15 min.

Hardness, Rockwell C 32 max.

Impact Energy, ft-lbs 74 min.

Mechanical Properties

Temperature F RT 32 -4 -40

Ft-lbs 162 162 155 140

Temperature F -76 -112 -148 -320

Ft-lbs 110 44 30 7

Temperature F 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

Density lb/in3 0.28

Modulus of Elasticity psi x 106 29

Coefcient of Thermal Expansion 68-212F/F x10-6/F 7.2

Thermal Conductivity Btu/h t F 8.7

Heat Capacity Btu/lb F 0.12

Electrical Resistivity -in x 10-6 31.5

Low Temperature Impact Properties

Elevated Temperature Tensile Properties

Physical Properties

ProcessingHot Forming

2507 should be hot worked between 1875F and 2250F. This should beollowed by a solution anneal at 1925F minimum and a rapid air or water quench.

Cold FormingMost o the common stainless steel orming methods can be used or cold

working 2507. The alloy has a higher yield strength and lower ductility than theaustenitic steels so abricators may nd that higher orming orces, increasedradius of bending, and increased allowance for springback are necessary. Deepdrawing, stretch orming, and similar processes are more dicult to perorm on2507 than on an austenitic stainless steel. When orming requires more than10% cold deormation, a solution anneal and quench are recommended.