Inconel, what exactly is it?

Inconel is a corrosion- and oxidation-resistant alloy that excels in high-temperature, high-pressure environments. When Inconel alloy is heated, a thick, stable oxide coating forms on the surface, protecting it from further attack. The strength of Inconel is maintained over a wide temperature range. It achieves high temperature strength through solid solution strengthening or precipitation hardening, depending on the alloy. Inconel is a high-temperature metal that finds widespread use in a variety of applications.

Inconel’s Chemical Formula

Inconel GradeCarbonManganeseSulfurPhosphorusChromiumSiliconMolybdenumNiobiumCobaltCopperAluminumTitaniumNickelIronBoron
Inconel 6000.151.000.01514.0–17.00.500.5072.0max6.0–10.0
Inconel 6170.150.500.0150.01520.0–24.00.508.0–10.010.0–15.00.500.8–1.500.6044.2–56.03.00max0.006
Inconel 6250.100.500.0150.01520.0–23.00.508.0–10.03.15–
Inconel 6900.0190.350.00330.0max0.350.010.0259.5max9.20max
Inconel 7180.080.350.0150.01517.0–21.00.352.8–3.34.75––0.80.65–1.150.3050.0–55.0balance0.006
Inconel X-7500.081.000.0114.0–17.00.500.7––1.02.25–2.7570.0max5.0–9.0

Inconel Mechanical Characteristics

Inconel GradeTensile StrengthYield Strength (0.2%Offset)DensityMelting PointElongation
Inconel 600Psi – 95,000 , MPa – 655Psi – 45,000 , MPa – 3108.47 g/cm31413 °C (2580 °F)0.4
Inconel 601Psi – 80,000 , MPa – 550Psi – 30,000 , MPa – 2058.1 g/cm31411 °C (2571 °F)0.3
Inconel 617≥ 485 MPa≥ 275 MPa8.3g/cm³1363°C0.25
Inconel 625Psi – 135,000 , MPa – 930Psi – 75,000 , MPa – 5178.4 g/cm31350 °C (2460 °F)0.425
Inconel 690≥ 485 MPa≥ 275 MPa8.3g/cm³1363°C0.25
Inconel 718Psi – 135,000 , MPa – 930Psi – 70,000 , MPa – 4828.2 g/cm31350 °C (2460 °F)0.45
Inconel 7251137 MPa827 MPa8.31 g/cm31271°C-1343 °C0.2
Inconel X-7501267 MPa868 MPa8.28 g/cm31430°C0.25

Inconel Equivalent Grade 

Inconel 6002.4816N06600NC15FE11MNCF 600NA 13NiCr15Fe
Inconel 6012.4851N06601NC23FeANCF 601NA 49NiCr23Fe
Inconel 6172.4663N06617    
Inconel 6252.4856N06625NC22DNB4MNCF 625NA 21NiCr22Mo9Nb
Inconel 6902.4642N06690    
Inconel 7182.4668N07718    
Inconel 725N07725    
Inconel X-7502.4669N07750    

What is Hastelloy, exactly?

Hastelloy is a high-melting-point nickel-molybdenum alloy. It comes in a range of grades, with nickel chromium molybdenum alloys accounting for the majority. Each Hastelloy grade is extremely corrosion resistant, regardless of the application for which it was created. When Hastelloy is alloyed with, it becomes stronger and tougher at higher temperatures, making it perfect for welding applications. It’s easy to shape and put together. They can be forged and cold worked due to their ductility. Hastelloy is a suitable choice for high-temperature applications due to its outstanding resistance to strongly oxidizing and reducing substances. In the chemical and petrochemical sectors, it is widely used for pipes and valves. It’s a fantastic material for heat exchangers, pressure vessels, nuclear and chemical reactors, and more.

Hastelloy Chemical Makeup

B0.10max1.25max0.60max28.00max0.30max5.50maxBalMn 0.80; Si 0.70
B20.02max1.00max1.00max26.0-30.02.00maxBalMn 1.0, Si 0.10
C0.07max1.25max16.00max17.00max0.30max40.0max5.75maxBalMn 1.0; Si 0.70
C40.015max2.00max14.0-18.014.0-17.00.70max3.00maxBalMn 1.0 ; Si 0.08
C276 0.02max2.50max14.0-16.515.0-17.00.35max3.0-4.54.0-7.0BalMn 1.0; Si 0.05
G0.05max2.50max21.0-23.55.5-7.51.00max1.5-2.51.7-2.518.0-21.0BalMn 1.0-2.0; P0.04; Si 1.0; 
N0.06max0.25max7.00max16.50max0.20max0.10max3.00maxBalMn 0.40; Si 0.25; B 0.01
S0.02max2.00max15.50max14.50max0.60max1.00max0.20max3.00maxBalMn 0.50; Si 0.40; B0.0009; La 0.02
W0.06max1.25max5.00max24.50max5.50maxBalMn 0.050; Si 0.50
X0.10max1.50max22.0max9.00max0.60max18.50maxBalMn 0.6; Si 0.60

Hastelloy’s Mechanical Characteristics

AlloyTensile StrengthYield Strength (0.2%Offset)DensityMelting PointElongation
Alloy C22Psi – 1,00,000 , MPa – 690Psi – 45000 , MPa – 3108.69 g/cm31399 °C (2550 °F)0.45
Alloy C276Psi – 1,15,000 , MPa – 790Psi – 52,000 , MPa – 3558.89 g/cm331370 °C (2500 °F)0.4
Alloy B2Psi – 1,15,000 , MPa –760Psi – 52,000 , MPa – 3509.2 g/cm31370 °C (2550 °F)0.4
Alloy B3Psi – 1,15,000 , MPa –760Psi – 52,000 , MPa – 3509.2 g/cm31370 °C (2550 °F)0.4
Alloy C47833658.64 g/cm31350-1400 °C0.55
Alloy X655 MPa240 MPa8.22 g/cm³1355°C0.35

Hastelloy’s Equivalent Grade

C222.4602N06022NW 6022NiCr21Mo14W
C2762.4819N10276ХН65МВУNW 0276NiMo16Cr15W

Read More :

Hastelloy VS Monel : Hastelloy is one of the most corrosion-resistant nickel-based steel alloys available. Monel is largely made of nickel and copper (52-67 percent), with minor amounts of silicon, manganese, iron, and carbon, Read more.

Inconel 601 Tubes – What Are They? :

Nickel, chromium, and iron-containing alloys make up Inconel 601 Tubes. These items are beneficial in general-purpose engineering and are designed for applications that demand heat and corrosion resistance. Inconel 601 Tubes can also be used in sour-water environments, Read More.