Difference Between Inconel and Titanium

Difference Between Inconel and Titanium

If you not sure which material would be most suitable for your application, here we’ve writtent the content with main features & material properties that differentiate Difference Between Inconel and Titanium.

Inconel

Inconel® is a registered trademark (of Special Metals Corporation) referring to a family of austenitic nickel-chromium super alloys. Inconel® is a material that is specifically optimized for some of the toughest use conditions to be found in manufacturing while Titanium is a chemical element with symbol Ti and atomic number 22. It is a lustrous transition metal with a silver color, low density, and high strength.

Inconel Material Specification

  • Inconel 600
    Solid solution strengthened.
  • Inconel 601
  • Inconel 625
    Acid resistant, good weldability. The LCF version is typically used in bellows. Ideal for hardware and components in the power, aerospace and chemical processing industries. Offered in sheet, plate, bar and forgings.
  • Inconel 718
    Gamma double prime strengthened with good weldability. The preferred material for cryogenic storage tanks, turbines, downhole shafts and wellhead parts offered in sheet, plate and bar.
  • Inconel X750
    Commonly used for gas turbine components, including blades, seals and rotors.
  • Inconel 907
  • Inconel 909
  • Inconel 706
  • Inconel 617
  • Inconel 751
    Increased aluminium content for improved rupture strength in the 1600 °F range.
  • Inconel 792
    Increased aluminium content for improved high temperature corrosion properties, used especially in gas turbines.
  • Inconel 939
    Gamma prime strengthened to increase weldability.
  • Inconel 188
    Readily fabricated for commercial gas turbine and aerospace applications. Offered in sheet, plate and bar.
  • Inconel 690
    Low cobalt content for nuclear applications, and low resistivity.
  • Inconel 713C
    Precipitation hardenable nickel-chromium base cast alloy.
  • Inconel 230
    Inconel 230 Plate & Sheet mainly used by the power, aerospace, chemical processing and industrial heating industries, Aerospace Materials.

Inconel Composition

Inconel Element (% by mass)
Ni Cr Fe Mo Nb Co Mn Cu Al Ti Si C S P B
600 72.0 14.0–17.0 6.0–10.0 1.0 0.5 0.5 0.15 0.015
617 44.2–56.0 20.0–24.0 3.0 8.0–10.0 10.0–15.0 0.5 0.5 0.8–1.5 0.6 0.5 0.15 0.015 0.015 0.006
625 58.0 20.0–23.0 5.0 8.0–10.0 3.15–4.15 1.0 0.5 0.4 0.4 0.5 0.1 0.015 0.015
690 59.5 30 9.2 0.35 0.01 0.02 0.35 0.019 0.003
718 50.0–55.0 17.0–21.0 balance 2.8–3.3 4.75–5.5 1.0 0.35 0.2–0.8 0.65–1.15 0.3 0.35 0.08 0.015 0.015 0.006
X-750 70.0 14.0–17.0 5.0–9.0 0.7–1.2 1.0 1.0 0.5 0.4–1.0 2.25–2.75 0.5 0.08 0.01

Inconel alloys

Alloys of inconel include:

  • Inconel 600: Solid solution strengthened
  • Inconel 601
  • Inconel 625: Acid resistant, good weldability. The LCF version is typically used in bellows.
  • Inconel 690: Low cobalt content for nuclear applications, and low resistivity
  • Inconel 713C: Precipitation hardenable nickel-chromium base cast alloy
  • Inconel 718: Gamma double prime strengthened with good weldability
  • Inconel 751: Increased aluminium content for improved rupture strength in the 1600 °F range
  • Inconel 792: Increased aluminium content for improved high temperature corrosion properties, used especially in gas turbines
  • Inconel 939: Gamma prime strengthened to increase weldability

Inconel Equivalent Grades

STANDARD WERKSTOFF NR. UNS GOST AFNOR JIS BS EN OR
Inconel 600 2.4816 N06600 МНЖМц 28-2,5-1,5 NC15FE11M NCF 600 NA 13 NiCr15Fe ЭИ868
Inconel 601 2.4851 N06601 XH60BT NC23FeA NCF 601 NA 49 NiCr23Fe ЭИ868
Inconel 617 2.4663 N06617            
Inconel 625 2.4856 N06625 ХН75МБТЮ NC22DNB4M NCF 625 NA 21 NiCr22Mo9Nb ЭИ602
Inconel 690 2.4642 N06690            
Inconel 718 2.4668 N07718            
Inconel 725 - N07725            
Inconel X-750 2.4669 N07750            

Inconel Melting Point, Density and Tensile Strength

  Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
600 8.47 g/cm3 1413 °C (2580 °F) Psi – 95,000 , MPa – 655 Psi – 45,000 , MPa – 310 40 %
601 8.1 g/cm3 1411 °C (2571 °F) Psi – 80,000 , MPa – 550 Psi – 30,000 , MPa – 205 30 %
617 8.3g/cm³ 1363°C ≥ 485 MPa ≥ 275 MPa 25 %
625 8.4 g/cm3 1350 °C (2460 °F) Psi – 135,000 , MPa – 930 Psi – 75,000 , MPa – 517 42.5 %
690 8.3g/cm³ 1363°C ≥ 485 MPa ≥ 275 MPa 25 %
718 8.2 g/cm3 1350 °C (2460 °F) Psi – 135,000 , MPa – 930 Psi – 70,000 , MPa – 482 45 %
725 8.31 g/cm3 1271°C-1343 °C 1137 MPa 827 MPa 20 %
X-750 8.28 g/cm3 1430°C 1267 MPa 868 MPa 25 %

Titanium

Titanium Grade 2 Titanium Alloy Inconel Grade 625 Stainless Steel 321 Stainless Steel 304
Temperature rating 450°C 800°C 1100°C 950°C 860°C
Typical Weight/M 3" Tube 1.28kg 0.96-1.28kg 1.00-1.40kg 1.7-2.26kg 2.26kg
  • Titanium is lighter
  • Titanium is harder to mark and you will see less scratches.
  • Inconel is a bit stiffer than Titanium

Advantages of Titanium
• Highest strength to weight ration of any metal
• High corrosion resistance
• High fatigue resistance
• Non-toxic

Disadvantages of Titanium
• Material stiffness not as good as aluminum alloys or carbon fiber
• Comparatively high cost

Grade Description
Titanium Grade 1 Unalloyed titanium, low oxygen, low strength
Titanium Grade 2 Unalloyed titanium, standard oxygen, medium strength
Titanium Grade 3 Unalloyed titanium, medium oxygen, high strength
Titanium Grade 4 Unalloyed titanium, high oxygen, extra high strength
Titanium Grade 5 Titanium alloy (6% aluminum, 4% vanadium)
Titanium Grade 7 Unalloyed titanium plus 0.12% to 0.25% palladium, standard oxygen, medium strength
Titanium Grade 9 Titanium alloy (3% aluminum, 2.5% vanadium), high strength. Mainly aerospace applications
Titanium Grade 11 Unalloyed titanium plus 0.12% to 0.25% palladium, low oxygen, low strength
Titanium Grade 12 Titanium alloy (0.3% molybdenum, 0.8% nickel), high strength
Titanium Grade 13 Titanium alloy (0.5% nickel, 0.05% ruthenium), low oxygen
Titanium Grade 14 Titanium alloy (0.5% nickel, 0.05% ruthenium), standard oxygen
Titanium Grade 15 Titanium alloy (0.5% nickel, 0.05% ruthenium), medium oxygen
Titanium Grade 16 Unalloyed titanium plus 0.04% to 0.08% palladium, standard oxygen, medium strength
Titanium Grade 17 Unalloyed titanium plus 0.04% to 0.08% palladium, low oxygen, low strength
Titanium Grade 18 Titanium alloy (3% aluminum, 2.5% vanadium plus 0.04% to 0.08% palladium),
Titanium Grade 19 Titanium alloy (3% aluminum, 8% vanadium, 6% chromium, 4% zirconium, 4% molybdenum)
Titanium Grade 20 Titanium alloy (3% aluminum, 8% vanadium, 6% chromium, 4% zirconium, 4% molybdenum) plus 0.04% to 0.08% palladium
Titanium Grade 21 Titanium alloy (15% molybdenum, 3% aluminum, 2.7% niobium, 0.25% silicon)
Titanium Grade 23 Titanium alloy (6% aluminum, 4% vanadium, extra low interstitial, ELI)
Titanium Grade 24 Titanium alloy (6% aluminum, 4% vanadium) plus 0.04% to 0.08% palladium
Titanium Grade 25 Titanium alloy (6% aluminum, 4% vanadium) plus 0.3% to 0.8% nickel and 0.04% to 0.08% palladium
Titanium Grade 26 Unalloyed titanium plus 0.08% to 0.14% ruthenium, standard oxygen, medium strength
Titanium Grade 27 Unalloyed titanium plus 0.08% to 0.14% ruthenium, low oxygen,low strength
Titanium Grade 28 Titanium alloy (3% aluminum, 2.5% vanadium) plus 0.08% to 0.14% ruthenium
Titanium Grade 29 Titanium alloy (6% aluminum, 4% vanadium with extra low interstitial elements (ELI) plus 0.08% to 0.14% ruthenium

Titanium & Titanium Alloys ASTM Specifications

ASTM-F136-98e1 Wrought Titanium-6 Aluminum-4 Vanadium ELI (Extra Low Interstitial) Alloy (UNSR56401) for Surgical Implant Applications
ASTM-F67-00 Unalloyed Titanium for Surgical Implant Applications (UNS R50250, UNS R50400, UNS R50550, UNS R50700)
ASTM-F1108-97a Ti6AL4V Alloy Castings for Surgical Implants (UNS R56406)
ASTM-F-620-00 Alpha Plus Beta Titanium Alloy Forgings for Surgical Implants
ASTM-F1472-99 Wrought Titanium-6 Aluminum-4 Alloy for Surgical Implant Applications (UNS R56400)
ASTM-F1341-99 Unalloyed Titanium Wire UNS R50250, UNS R50400, UNS R50550, UNS R50700, for Surgical Implant Applications
ASTM-F1295-97a Wrought Titanium-6 Aluminum-7 Niobium Alloy for Surgical Implant Applications (UNS R56700)
ASTM B265-99 Titanium and Titanium Alloy Strip, Sheet, and Plate
ASTM-B299-99 Titanium Sponge
ASTM-B338-99 Seamless and Welded Titanium &Titanium Alloy Tubes for Condensers & Heat Exchangers
ASTM-B348-00 Titanium and Titanium Alloy Bars and Billets
ASTM-B363-00 Seamless and Welded Unalloyed Titanium & Titanium Alloy Welding Fittings
ASTM-B367-93 (1998) Titanium and Titanium Alloy Castings
ASTM-B381-00 Titanium and Titanium Alloy Forgings
ASTM-B600-91 (1997)e1 Standard Guide for Descaling and Cleaning Titanium & Titanium Alloy Surfaces
ASTM-B861-00 Titanium and Titanium Alloy Seamless Pipe
ASTM-B862-99 Titanium and Titanium Alloy Welded Pipe
ASTM-B863-99a Titanium and Titanium Alloy Wire

Titanium Hardness Conversion Table

Brinell Rockwell Rockwell Approximate Tensile Brinell Rockwell Approximate Tensile
Hardness B Scale C Scale Lbs. psi Hardness B Scale lbs. psi.
653 - 62 324,000 217 95 103,000
627 - 60 311,000 212 96 103,000
601 - 68 306,000 207 95 101,000
578 - 57 290,000 202 94 98,000
555 - 56 284,000 197 93 96,000
534 - 54 270,000 192 92 93,000
514 - 53 263,000 187 91 91,000
495 - 51 250,000 183 90 89,000
477 - 50 243,000 179 89 87,000
461 - 49 236,000 174 88 85,000
444 - 47 223,000 170 87 83,000
429 - 47 217,000 166 86 81,000
415 - 45 211,000 163 85 80,000
401 - 42 194,000 159 84 78,000
388 - 41 188,000 156 83 77,000
375 - 40 182,000 153 82 76,000
363 - 38 171,000 149 81 75,000
352 - 37 166,000 146 80 74,000
331 - 36 162,000 143 79 73,000
321 - 34 153,000 140 78 71,000
311 - 33 148,000 137 77 70,000
302 - 32 144,000 134 76 69,000
293 - 31 140,000 131 74 67,000
285 - 30 136,000 128 73 66,000
277 - 29 132,000 126 72 65,000
269 - 28 129,000 124 71 63,000
262 - 27 126,000 121 70 62,000
255 - 25 120,000 118 69 61,000
248 - 24 117,000 116 68 60,000
241 100 23 115,000 114 67 59,000
235 99 22 112,000 112 66 58,000
229 98 21 110,000 109 65 57,000
223 97 20 108,000 107 64 55,000

Titanium Gauge Conversion

Gauge Numbers US Standards Gauge Numbers US Standards
0 0.312 16 0.0625
1 0.281 17 0.0562
2 0.266 18 0.05
3 0.25 19 0.0438
4 0.234 20 0.0375
5 0.219 21 0.0344
6 0.203 22 0.0312
7 0.188 23 0.0281
8 0.172 24 0.025
9 0.156 25 0.0219
10 0.141 26 0.0188
11 0.125 27 0.0172
12 0.109 28 0.0156
13 0.0938 29 0.0141
14 0.0781 30 0.0125
15 0.0703

Titanium Equivalent Grades

STANDARD WERKSTOFF NR. UNS
Titanium Gr 1 3.7025 R50250
Titanium Gr 2 3.7035 R50400
Titanium Gr 5 3.7165 R56400
Titanium Gr 7 3.7235 R52400
Titanium Gr 9 3.7195 R56320
Titanium Gr 12 3.7105 R53400

Titanium Chemical Composition

Grade C N O H Ti Fe
Titanium Gr 2 0.10 max 0.03 max 0.25 max 0.015 max bal 0.30 max

Grade C N O H Ti Fe V Al
Titanium Gr 5 0.10 max 0.05 max 0.20 max 0.015 max bal 0.30 max 3.5-4.5 5.5-6.75 max

Grade C N O H Ti Fe
Titanium Gr 1 .08 max .03 max .18 max .015 max bal .20 max
Titanium Gr 4 .08 max .05 max .40 max .015 max bal .50 max
Titanium Gr 7 .08 max .03 max .25 max .015 max bal .30 max
Titanium Gr 9 .08 max .03 max .15 max .015 max - .25 max
Titanium Gr 12 .08 max .03 max .25 max 0.15 max - .30 max

Titanium Hardness and Tensile Strength

Grade Min.Tensile(KSI) Min.Yield(KSI) Hardness Tensile Modulus Poisson's Ratio
Titanium Gr 2 50 40 14.9 103 GPa 0.34-0.10
Titanium Gr 5 130 120 16.4 114 GPa 0.30-0.33

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