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          • 800-HPALLOY
          • 1985 E 500 N Windfall, IN 46076
            444 Wilson St Tipton, IN 46072
            Post Office Box 40 Tipton, IN 46072
            tel:8004725569

          FERRALIUM 255 (UNS S32550) Description

          Cr 25.5, Ni 5.5, Mo 3.4 C 0.04, Mn 1.5, Si 1.0, Fe bal, N 0.175, S 0.030, Cu 2.00, P 0.040

           

          1. Download FDA statement concerning the use of stainless steels as food contact surfaces of equipment. 154 KB PDF

           

          Request a quote

          Overview

          FERRALIUM 255 is finding many cost effective applications in the chemical, marine, metallurgical, municipal sanitation, plastics, oil and gas, petrochemical, pollution control, wet phosphoric acid, paper making and metalworking industries.

          Called "super" because it is more alloyed than ordinary stainless steels and has superior corrosion resistance, FERRALIUM 255 is being used in areas where conventional stainless' are inadequate or, at best marginal. One good example s in the paper industry which was hit with an epidemic of corrosion problems when environmental laws forced recycling of process liquids In closed systems, chemicals such as chlorides can build up to highly corrosive concentrations over time. Paper makers have found that ordinary stainless equipment, which had previously given good service, was no longer adequate for many applications.

          FERRALIUM 255 is a duplex alloy with a high strength to weight ratio with superior abrasion and cavitation resistance. Resistance to chloride SCC, as well as crevice corrosion and pitting. Good ductility with a high fatigue strength in marine applications. Twice the yield strength of Alloy 20, and stronger than Duplex 2205. An excellent 40°C critical pitting temperature (ASTM G48-Method A), twice that of Alloy 2205.

          Principal Features of Alloy 255 Compared To 300 Series Austenitic Stainless Steels

          • Superior Corrosion Resistance
          • Pitting
          • Crevice Corrosion
          • Chloride Stress Corrosion Cracking
          • General Corrosion In Many Environments
          • Good Ductility
          • High Strength-To-Weight Ratio
          • High Fatigue Strength In Marine Environments
          • Superior Abrasion and Cavitation Erosion Resistance
          • High Mechanical Strength - (over twice the yield strength of austenitic stainless steels)
          • Good Fabricability


           

          Characteristics

          • Density 0.282 lb/in

          • Specific Gravity 7.81

          • Thermal Expansion

          • Coefficient (68° to 600°F) 6.7X10^-6 in/in/°F

          • Thermal Conductivity (68°F) 105 Btu/sqr ft/hr/°F/in

          • Electrical Resisitivity (68°F) 473 Ohms/cir mil ft

          • Dynamic Modulus of Elasticity 30.5x10^6 psi


           

          Applications

          FERRALIUM 255 is a cost effective alternative to materials such as the nickel alloys, 20 type alloys, brass and bronze. Marine environments have long been the domain of admiralty bronze. Alloy 255 is replacing admiralty bronze, and the nickel alloys, in offshore platforms, deck hardware, rudders and shafting.

          Alloy 255 is also making inroads in "borderline" corrosion applications where the nickel alloys and high performance alloys have been used but may not have been absolutely necessary. In some instances, it has even been used to replace high performance Ni-Cr-Mo-F-Cu alloys in the phosphoric acid industry.

          Valves, pumps, shafts, marine environments, Applications in down-hole, waste water, polycarbonate production, and demineralized water production.

          Fluid Flow Applications

          Process

          Temperature

          Corrodant

          Prior Material

          Caffeine Production

          95 °C

          Cholrides

          316

          Waste Odor Removal

          Ambient

          Cholrides

          --

          Wet Process Phos Acid

          180 °F

          H 2 SO 4
          Solids

          317L
          316L

          Sour Gas Downhole
          Instruments

          Up to 350 °F

          H 2 S Chlorides

          316, 410
          Nitronic 50

          Waste Water Treatment

          150-300 °F

          Mixed Acids
          Chlorides

          316 FRP

          Polycarbonate Production 250-300 °F Ambient 2205
          Demineralize Water Ambient Chlorides PVC, Carbon
          Steel, Stainless
          Gold Mine Oxygen Lance
          and Vent
          217 °F H 2 SO 4
          Chlorides
          316, C-276
          600, TI

           

          Chemistry

          FERRALIUM 255's high critical pitting temperature and high critical crevice temperature provide more resistance to pitting and crevice corrosion than lesser alloyed materials. The alloy's very high yield strength combined with good ductility allows lower wall thicknesses in process equipment.

           

          Chemical Requirements

          Ni

          Cr

          Mo

          Mn

          C

          Si

          Fe

          Max

          6.5

          27.0

          3.9

          1.50

          0.04

          1.00

          Bal

          Min

          4.5

          24.0

          2.9


          Tensile Data

          Mechanical Property Requirements

          Ultimate Tensile

          Yield Strength (0.2% OS)

          Elong.

          R/A

          Hardness Brinell

          Min

          110 KSi

          80 KSi

          15%

          Max

          297

          Min

          760 MPa

          550 MPa

          Max


          Specifications

          Specifications

          Form

          Standard

          Metal Type

          UNS S32550

          Bar

          ASTM A479

          Wire

          Sheet

          ASTM A240

          Plate

          ASTM A240

          Fitting

           

          Forging

           

          Weld Wire

           

          Weld Electrode

          E2553

          Din

          1.4507

           

          Is Stronger Than Most Competitive Alloys

          Alloy

          UNS

          Typical Tensile
          (ksi)

          Typical Yeild
          (ksi)

          Typical Elongation
          (%)

          Alloy 255

          S32550

          126

          98

          30

          316L

          S31603

          81

          42

          50

          NiCu400

          N04400

          78

          31

          50

          20Cb-3

          N08020

          92

          47

          39

          2205 Duplex

          S31803

          112

          75

          32

           

          Alloy Comparison

          Chemistry

          Alloy 316SS

          Alloy 2205

          Alloy 255

          CR

          17

          22

          25.3

          NI

          10

          5

          6

          MO

          2

          3

          3

          CU

          --

          --

          2

          N

          --

          0.15

          0.22

           

          Machining

          MACHINING DATA
          Carbide tools are suggested
          for rates better than 50% of Type 304.
          Machining Type Suggested starting rates are:
          Single Point turning : Roughing - 0.15" depth, 0.015"/rev feed -175 SFM
          Finishing - 0.025" depth, 0.007"/rev feed - 200 SFM
          Drilling : 1/4" Dia hole - 0.004"/rev feed - 60 SFM
          1/2" Dia hole - 0.007"/rev feed - 60 SFM
          3/4" Dia hole - 0.010"/rev feed - 60 SFM
          Reaming : Feed - same as drilling - 100 SFM
          Side and Slot Milling : Roughing - 0.25" depth - 0.007"/tooth feed - 125SFM
          Finishing - 0.050" depth - 0.009"/tooth feed - 140SFM
          These rates are for carbide tools,
          Type C-2 for roughing, drilling and reaming.
          Type C-3 for finishing.

          Other Technical Data

          Elongation Comparison

          elongation Comparison

          elongation

          Alloy 316SS Alloy 2205 Ferralium Alloy 255

           

          40

          25

          15

          Hardness Comparison

          Wear Resistance

          Alloy 316SS

          Alloy 2205

          Ferralium Alloy 255

          Hardness

          RB80

          RC21

          RC28

          Critical Pitting Temperature Comparison
          Critical Pitting Temperature

          Alloy 316SS

          Alloy 2205

          Ferralium Alloy 255

          Degree C ASTM
          G48-Method A
          0 20 40
          Pitting Potential - MV Comparison
          Temperature

          Alloy 316SS

          Alloy 2205

          Ferralium Alloy 255

          50 °C 60 370 No Pitting
          60 °C No Test No Test 110
          60 °C No Test No Test 170
          Critical Crevice Comparison
          Critical Crevice Temperature

          Alloy 316SS

          Alloy 2205

          Ferralium Alloy 255

          Degree C ASTM
          G48-Method B
          (10% FE CL 6H 0)
          -2.5 17.5 22.5
          C Ring Stress Cracking Comparison
          C Ring Stress Cracking

          Alloy 316SS

          Alloy 2205

          Ferralium Alloy 255

          80 Degree C Stressed to 100% Yield Strength, H2S
          0.125 Bar, Sour Brine with 46,000 MG/L Chloride
          Cracks Fine Cracks No Cracks
          PREN No. Comparison
          Resistance to Localized Corrosion

          Alloy 316SS

          Alloy 2205

          Ferralium Alloy 255

          PREN No. CR + 3.3(MO) + 16(N) 23.6 34.5 40
          Corrosion Rates Comparison
          Corrosion Rates MPY

          Alloy 316SS

          Alloy 2205

          Ferralium Alloy 255

          10% Sulfuric Boiling 855 206 40
          65% Nitric Boiling 11 21 5
                 

           

          FERRALIUM® is a registered trademark of Langley Alloys LTD.



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