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1 NIMONIC alloy alloy 75 (UNS N06075 & ) is an 80/20 nickel - chromium alloy withcontrolled additions of titanium and carbon. Firstintroduced in the 1940s for turbine blades in theprototype Whittle jet engines, it is now mostly used forsheet applications calling for oxidation and scalingresistance coupled with medium strength at highoperating temperatures. It is still used in gas turbineengineering and also for industrial thermal processing,furnace components and heat-treatment equipment.

2 It isreadily fabricated and physical properties for NIMONIC alloy 75 aregiven in Tables 2-4. Thermal expansion data in Table 3were determined on fully heat-treated material. The dataare subject to a variation of approximately 5%according to processing variables. The dynamicmodulus data in Table 4 were obtained from fully heat-treated cylindrical specimens vibrated in the flexuralmode. The recommended heat treatments are quoted inthe Heat Treatment section of this PPrrooppeerrttiieessTTaabbllee 11- Limiting Chemical Composition, %(as in BS HR 203)Carbon.

3 **Reference to the balance of the alloy composition does not guaranteethis is exclusively of the element mentioned but that it predominatesand others are present only in minimal 22- Physical PropertiesDensity*, Range, C ..1340-1380 F ..2450-2520 Specific Heat, J/kg C ..461 at 20 CBtu/lb F .. at 68 FThermal Conductivity, W/m C .. at 20 CBtu in/ft2 h F .. at 68 FElectrical Resistivity, m .. at 20 C circ mil/ft ..656 at 68 F*Dependent on processing 33- Mean Coefficient of Linear Thermal Expansion CC1100--66// FF FF1100--66// CCTT aabbllee 44- Dynamic Young s Modulus CC110033kkssiiGGPPaa FFTT eemmppeerraattuurreeTensile properties for bar are shown in Figure 1, and forsheet in Figure 2.

4 Creep-rupture properties are shownby Larson-Miller presentation in Figure all these tests, bar material was heat-treated for30-60 minutes at 1050 C (1920 F) and air-cooled, andsheet material was heat-treated for 5-10 minutes at1050 C (1920 F) and PPrrooppeerrttiieessPublication Number SMC-058 Copyright Special Metals Corporation, 2004 (Sept 04)NIMONIC, INCONEL, and MONEL are trademarksof the Special Metals Corporation group of data contained in this publication is for informational purposes only andmay be revised at any time without prior notice.

5 The data is believed to beaccurate and reliable, but Special Metals makes no representation or warranty ofany kind (express or implied) and assumes no liability with respect to theaccuracy or completeness of the information contained herein. Although thedata is believed to be representative of the product, the actual characteristics orperformance of the product may vary from what is shown in this contained in this publication should be construed as guaranteeing theproduct for a particular use or aallllooyy 7755280080060402060040020004008002004006 008001000 1200 1400 1600 1800120016001000 Temperature, CTemperature, FStress, MPaElongation, %Tensile Proof StressStress.

6 Ksi220020406080100120140160180200 FFiigguurree properties of NIMONIC alloy 75 C MPaSheetBarFFiigguurree properties of NIMONIC alloy 75 bar and 1200 1400180016006004002008060402008004000200 400600800800 Temperature, CTemperature, FStress, MPaElongation & Reduction of Area, %Reduction of AreaElongationTensile Proof StressStress, ksi220020406080100120140160180200 FFiigguurree properties of NIMONIC alloy 75 Parameter, T(20 + log t) x10-3, T in K, t in hoursNNIIMMOONNIICC aallllooyy 77553 INCONEL alloy HX100+20-20-60-100-140-180-2000200400600 800 Hours of Cyclic OxidationWeight Change, mg/cm2 Type 304 Stainless Steel*Type 309 Stainless Steel*INCOLOY alloy 800H*NIMONIC alloy 263 NIMONIC alloy 75 INCONEL alloy 601 NIMONIC alloy 86 FFiigguurree oxidation resistance.

7 Cycles of 20 minutesheating/5 minutes cooling except where marked * where theheating cycles were 15 RReessiissttaanncceeOxidation resistance data are presented in Tables 5 and 6,and in Figure 4. For the continuous heating tests (Table 5),the specimens were oxidized in still air and the weight losswas determined after descaling electrolytically in 55- Oxidation Resistance (Continuous Heating)AAllllooyy11110000 CC((22001100 FF))11000000 CC((11883300 FF))995500 CC((11774400 FF))990000 CC((11665500 CC))880000 CC((11447700 FF))NIMONIC 66- Oxidation Resistance (Intermittent Heating*)AAllllooyy11110000 CC((22001100 FF))11000000 CC((11883300 FF))995500 CC((11774400 FF))

8 990000 CC((11665500 FF))WWeeiigghhtt LLoossss ((mmgg//ccmm22)) aafftteerr 110000 hhoouurrss aattWWeeiigghhtt LLoossss ((mmgg//ccmm22)) aafftteerr 110000 hhoouurrss aatt*Cooled to room temperature every 24 alloy 75 has a stable, austenitic, solid solution atall temperatures below the solidus and, apart fromrecrystallization and grain growth, is unaffected by heattreatment. Typically, three phases are visible:1) Oxide or silicate inclusions that arise from de-oxidationof the molten metal, visible in the polished condition assmall, dark inclusions frequently present as stringersoriented in the principle working ) Intergranularly occurring primary carbides, nitrides orcarbonitrides of the general type M(CN) where M isusually titanium.

9 They are visible in the polishedcondition as substantially equiaxed, roughly spherical orcuboid inclusions whose color varies from white topurple for the carbide, to yellow for the ) chromium -rich grain boundary carbides, usually of thetype M23C6. The carbides will dissolve into the matrixwith heat, but at a temperature much higher than thenormal annealing etches for NIMONIC alloy 75 are:1) A 4% aqueous solution of sulfuric acid usedelectrolytically at approximately ) Fry s Reagent (4 g cupric chloride dissolved in 20 cm3concentrated hydrochloric acid and 20 cm3water).

10 FFaabbrriiccaattiioonn && WWeellddiinnggNIMONIC alloy 75 s work-hardening characteristics arecompared with a range of other alloys in Figure 5. HHeeaatt--TTrreeaattmmeennttFor bar30-60 minutes at 1050 C (1920 F) followed byair sheet 5-10 minutes at 1050 C (1920 F) followed by aircooling or, before welding, 5-10 min/1050 C(1920 F)/AC + an optional 10 min/1050 C(1920 F) WWoorrkkiinnggNIMONIC alloy 75 can be hot worked in the range 1220-950 C (2230-1740 F).CCoolldd WWoorrkkiinnggThe good ductility and malleability of annealed NIMONIC alloy 75 make it amenable to many methods of colddeformation.