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Inconel Alloys Chemical Composition Comparison
600 vs 601 vs 625 vs 718 – Key Differences Highlighted
Inconel 600
UNS N06600
Ni
Nickel (Base) ≥72%
Cr
Chromium 14-17%
Fe
Iron 6-10%
C
Carbon ≤0.15%
Mn
Manganese ≤1.0%
Si
Silicon ≤0.5%
Cu
Copper ≤0.5%
Standard nickel-chromium: High temperature oxidation resistance
Inconel 601
UNS N06601
Ni
Nickel (Base) 58-63%
Cr
Chromium 21-25%
Fe
Iron Balance
Al
Aluminum 1.0-1.7%
C
Carbon ≤0.10%
Mn
Manganese ≤1.0%
Si
Silicon ≤0.5%
Aluminum addition: Excellent oxidation resistance
Inconel 625
UNS N06625
Ni
Nickel (Base) ≥58%
Cr
Chromium 20-23%
Mo
Molybdenum 8-10%
Nb
Niobium 3.15-4.15%
Fe
Iron ≤5%
C
Carbon ≤0.10%
Mn
Manganese ≤0.50%
Niobium & Molybdenum: Exceptional corrosion resistance
Inconel 718
UNS N07718
Ni
Nickel (Base) 50-55%
Cr
Chromium 17-21%
Fe
Iron Balance
Nb
Niobium 4.75-5.50%
Mo
Molybdenum 2.8-3.3%
Ti
Titanium 0.65-1.15%
Al
Aluminum 0.2-0.8%
Age-hardenable: High strength to 1300°F

What is Inconel 600, 601, 625 & 718?

Inconel 600, 601, 625, and 718 are nickel-chromium-based superalloys known for their outstanding resistance to oxidation, corrosion, and high-temperature strength. These alloys retain excellent mechanical properties even under extreme thermal and chemical conditions, making them ideal for aerospace, chemical processing, heat treatment, and marine applications.

Inconel 600

Nickel (Ni)

72.0 Min

Chromium (Cr)

14.0 – 17.0%

Iron (Fe)

6.0 – 10.0%

Carbon (C) Max

0.15%

Manganese (Mn) Max

1.0%

Sulfur (S) Max

0.015%

Silicon (Si) Max

0.5%

Copper (Cu) Max

0.5%

Inconel 601

Nickel (Ni)

58.0 – 63.0%

Chromium (Cr)

21.0 – 25.0%

Aluminum (Al)

1.0 – 1.7%

Iron (Fe)

Balance

Carbon (C) Max

0.10%

Manganese (Mn) Max

1.0%

Silicon (Si) Max

0.5%

Sulfur (S) Max

0.015%

Inconel 625

Nickel (Ni)

58.0 Min

Chromium (Cr)

20.0 – 23.0%

Molybdenum (Mo)

8.0 – 10.0%

Niobium + Tantalum (Nb + Ta)

3.15 – 4.15%

Iron (Fe)

5.0 Max

Carbon (C) Max

0.10%

Manganese (Mn) Max

0.5%

Silicon (Si) Max

0.5%

Inconel 718

Nickel (Ni)

50.0 – 55.0%

Chromium (Cr)

17.0 – 21.0%

Iron (Fe)

Balance

Niobium + Tantalum (Nb + Ta)

4.75 – 5.50%

Molybdenum (Mo)

2.80 – 3.30%

Titanium (Ti)

0.65 – 1.15%

Aluminum (Al)

0.20 – 0.80%

Carbon (C) Max

0.08%

Types of Inconel 600, 601, 625 & 718 Pipes & Tubes

Ratnadeep Steel & Engg. Co. manufactures a wide range of Inconel 600, 601, 625, and 718 seamless and welded pipes & tubes. Each grade is designed to perform exceptionally in extreme environments, ensuring durability, high strength, and superior resistance to heat and corrosion.

Inconel 600/601/625/718 Seamless Pipes & Tubes

Manufactured from high-grade Inconel billets, seamless pipes & tubes offer superior mechanical integrity and performance in high-pressure, high-temperature, and corrosive environments. Ideal for aerospace engines, heat exchangers, and petrochemical processing systems, they provide reliability without weld-related weaknesses.

Inconel 600/601/625/718 Welded Pipes & Tubes

Welded pipes & tubes are crafted using premium-quality Inconel sheets and advanced welding processes to ensure excellent dimensional accuracy and corrosion resistance. They are suitable for chemical plants, power generation, and structural applications where cost efficiency and performance must coexist.

Specification of Inconel Seamless & Welded Pipes And Tubes

Specification Details
Inconel Pipe Specification ASTM B167, B517, B983, B444, B705 / ASME SB167, SB517, SB983, SB444, SB705
Inconel Tube Specification ASTM B516 / ASME SB516, ASTM B704 / ASME SB704, ASME SB983
Standard ASTM, ASME and API
Tube Size 15″NB – 150″NB
Thickness Range 6.35 mm OD upto 254 mm OD in 0.6 TO 20 mm thickness
Type Seamless / ERW / Welded / Fabricated Pipes
Form Round, Square, Rectangular, Oval, Hydraulic Etc
Length Single Random, Double Random & Required Length
End Plain End, Beveled End, Threaded
End Protection Plastic Caps
Inspection, Test Reports Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports, Destructive Test Report, Non Destructive Test Reports
Packing Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests
Specials Sizes and Specifications other than above can be manufactured on request

CHEMICAL COMPOSITION OF INCONEL ALLOY SEAMLESS / WELDED PIPES AND TUBES

Grade C Mn Si S Cu Fe Ni Cr
Inconel 600 0.15 max 1.00 max 0.50 max 0.015 max 0.50 max 6.00 – 10.00 72.00 min 14.00 – 17.00
Inconel 601 0.10 max 1.0 max 0.5 max 0.015 max 1.0 max Balance 58.0 – 63.0 21.0 – 25.0
Inconel 625 0.10 max 0.50 max 0.50 max 0.015 max – 5.0 max 58.0 min 20.0 – 23.0
Inconel 718 0.08 max 0.35 max 0.35 max 0.015 max 0.30 max – 50.00 – 55.00 17.00 – 21.00

MECHANICAL PROPERTIES OF INCONEL ALLOY 600/601/625/718 PIPES AND TUBES

Element Density Melting Point Tensile Strength Yield Strength (0.2% Offset) Elongation
Inconel 600 8.47 g/cm³ 1413 °C (2580 °F) Psi – 95,000 , MPa – 655 Psi – 45,000 , MPa – 310 40 %
Inconel 601 8.1 g/cm³ 1411 °C (2571 °F) Psi – 80,000 , MPa – 550 Psi – 30,000 , MPa – 205 30 %
Inconel 625 8.4 g/cm³ 1350 °C (2460 °F) Psi – 1,35,000 , MPa – 930 Psi – 75,000 , MPa – 517 42.5 %
Inconel 718 8.2 g/cm³ 1350 °C (2460 °F) Psi – 1,35,000 , MPa – 930 Psi – 75,000 , MPa – 482 45 %

💡 Practical Difference in Use

Use Inconel 600 when: excellent resistance to high temperature oxidation and corrosion is needed. → Example: furnace components, heat treatment equipment, chemical processing.

Use Inconel 601 when: superior oxidation resistance and high mechanical strength at elevated temperatures are required. → Example: radiant tubes, combustion cans, thermal reactors.

Use Inconel 625 when: exceptional fatigue strength and outstanding chloride corrosion resistance are critical. → Example: marine engineering, chemical processing, aerospace components.

Use Inconel 718 when: high strength and excellent creep rupture strength at temperatures up to 1300°F are needed. → Example: gas turbine components, rocket motors, nuclear reactors.

Uses of Inconel Alloy Pipes and Tubes

The uses are defined by their exceptional high-temperature strength, outstanding corrosion resistance, and excellent mechanical properties. These pipes are used in extreme environments where conventional materials would fail.

  • High-Temperature Applications: Inconel pipes excel in environments with temperatures exceeding 1000°C, maintaining structural integrity where other alloys would weaken or fail.
  • Corrosive Chemical Processing: Used for transporting highly corrosive chemicals, acids, and process streams in chemical plants and refineries.
  • Critical Aerospace and Defense Systems: Essential for rocket engines, gas turbines, and other aerospace applications where reliability under extreme conditions is paramount.

When to Choose Different Inconel Grades?

This is a critical decision for engineers working with extreme environments. Each Inconel grade offers specific advantages for different applications.

Choose Inconel 600 when:

  • Excellent resistance to oxidation up to 2150°F (1177°C)
  • Good corrosion resistance in various atmospheres
  • Cost-effective nickel-chromium alloy solution
  • Furnace components and heat treatment equipment

Choose Inconel 601 when:

  • Superior oxidation resistance required
  • High temperature mechanical strength needed
  • Cyclic oxidation conditions present
  • Combustion system components

Choose Inconel 625 when:

  • Exceptional fatigue and thermal fatigue strength
  • Outstanding resistance to pitting and crevice corrosion
  • Chloride ion stress corrosion cracking resistance
  • Marine and chemical processing applications

Choose Inconel 718 when:

  • High strength to 1300°F (704°C) required
  • Excellent creep rupture strength needed
  • Age-hardenable alloy properties essential
  • Aerospace and gas turbine components

Industries That Use Inconel Alloy Pipes and Tubes

Inconel alloys are essential in industries where extreme temperatures, corrosive environments, and high mechanical stresses are encountered. Here are the primary applications:

Aerospace and Aviation Industry

This is one of the largest applications for Inconel alloys due to extreme temperature requirements.

Uses

Jet engine components, rocket motor cases, exhaust systems, turbine blades, and afterburner components.

Material Choice

Inconel 718: Turbine disks, blades, and fasteners
Inconel 625: Ducting systems and exhaust components
Inconel 601: Combustion chambers and afterburners

Chemical Processing Industry

For handling highly corrosive chemicals at elevated temperatures and pressures.

Uses

Reactor vessels, heat exchangers, distillation columns, piping systems, and catalyst support grids.

Material Choice

Inconel 625: Chloride-containing environments, acid services
Inconel 600: Caustic environments, organic chemical processing
Inconel 601: High temperature chemical reactors

Power Generation

Critical for both conventional and nuclear power plants operating at high temperatures.

Uses

Heat exchanger tubing, steam generator tubes, turbine components, and nuclear reactor core components.

Material Choice

Inconel 600: Steam generator tubing
Inconel 718: Gas turbine components
Inconel 625: Flue gas desulfurization systems

Marine and Offshore Engineering

For applications requiring resistance to seawater corrosion and high strength.

Uses

Propeller blades, submarine fittings, seawater piping, heat exchangers, and offshore platform components.

Material Choice

Inconel 625: Seawater handling systems, propeller blades
Inconel 718: High-strength marine fasteners
Inconel 600: Heat exchanger tubing

Oil and Gas Industry

For downhole and surface equipment in corrosive and high-temperature environments.

Uses

Downhole tubing, wellhead components, Christmas trees, flow lines, and heat exchangers in refineries.

Material Choice

Inconel 625: Sour service applications, H₂S environments
Inconel 718: High-strength downhole tools
Inconel 600: Heat exchanger applications

Nuclear Industry

For components requiring radiation resistance and high temperature performance.

Uses

Control rod drive mechanisms, reactor core components, steam generator tubing, and nuclear waste processing.

Material Choice

Inconel 600: Steam generator tubes
Inconel 718: Reactor core structural components
Inconel 625: Nuclear waste processing equipment

Heat Treatment Industry

For furnace components and equipment operating at extreme temperatures.

Uses

Radiant tubes, muffles, retorts, baskets, and furnace rollers in heat treating operations.

Material Choice

Inconel 601: Radiant tubes and combustion chambers
Inconel 600: Furnace components and fixtures
Inconel 625: High temperature fixtures

Pollution Control

For systems handling corrosive flue gases and emissions.

Uses

Flue gas desulfurization systems, scrubbers, dampers, and waste incineration equipment.

Material Choice

Inconel 625: FGD systems, scrubber components
Inconel 601: Thermal oxidizers and incinerators
Inconel 600: Pollution control ducting

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