Difference Between Inconel and Stainless Steel

Inconel

Inconel, a product of Special Metals Corp., has a nickel, chromium and molybdenum composition. Inconel is resistant to corrosion and pitting and comes in several different alloys. Stainless steel is composed of carbon, manganese, phosphorus, sulfur, silicone, chromium and nickel. Both Inconel and stainless steel use a numbering system for different alloys and strengths. These products have silver finishes, but different textures create matte or shiny surfaces.

Cost or Price Difference between Inconel & stainless steel

Inconel is more expensive than stainless steel. For example, exhaust valves for fast cars cost $150 more than stainless, at the time of publication. Special Metals Corp., the inventor of Inconel, sells this alloy in flat sheets, pipes, tubes, flat bars, wire and other shapes. Special Metals shows production of 25 qualities of Inconel. Each product has different characteristics and a different price.

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 %

Stainless Steel

Stainless Steel Equivalent Grades

STANDARD WERKSTOFF NR. UNS JIS BS GOST AFNOR EN
SS 304 1.4301 S30400 SUS 304 304S31 08Х18Н10 Z7CN18‐09 X5CrNi18-10
SS 304L 1.4306/1.4307 S30403 SUS 304L 304S11 03Х18Н11 Z3CN18‐10 X2CrNi18-9 / X2CrNi19-11
SS 310 1.4845 S31000 - - - - -
SS 310S 1.4845 S31008 SUS310S - 20Ch23N18 - X8CrNi25-21
SS 316 1.4401 / 1.4436 S31600 SUS 316 316S31 / 316S33 - Z7CND17‐11‐02 X5CrNiMo17-12-2 / X3CrNiMo17-13-3
SS 316L 1.4404 / 1.4435 S31603 SUS 316L 316S11 / 316S13 03Ch17N14M3 / 03Ch17N14M2 Z3CND17‐11‐02 / Z3CND18‐14‐032 X2CrNiMo17-12-2 / X2CrNiMo18-14-3
SS 317 1.4449 S31700 SUS 317 - - - X6CrNiMo19-13-4
SS 317L 1.4438 S31703 SUS 317L - - - X2CrNiMo18154
SS 321 1.4541 S32100 SUS 321 - 08Ch18N10T - X6CrNiTi18-10
SS 321H 1.4541 S32109 SUS 321H - - - X6CrNiTi18-10
SS 347 1.4550 S34700 SUS 347 - 08Ch18N12B - X6CrNiNb18-10
SS 347H 1.4961 S34709 SUS 347H - - - X7CrNiNb18-10
SS 446 1.4762 S44600 - - - - -

Stainless Steel Composition

Grade C Mn Si P S Cr Mo Ni N
SS 304 0.08 max 2 max 0.75 max 0.040 max 0.030 max 18 – 20 - 8 – 11 -
SS 304L 0.03 max 2 max 0.75 max 0.045 max 0.030 max 18 – 20 - 8 – 12 0.10 max
SS 310 0.25 max 2 max 1.50 max 0.045 max 0.030 max 24 - 26 - 19 - 22 -
SS 310S 0.08 max 2 max 1.50 max 0.045 max 0.030 max 24 - 26 - 19 - 22 -
SS 316 0.08 max 2 max 0.75 max 0.045 max 0.030 max 16 - 18 2 - 3 10 - 14 0.1 max
SS 316L 0.3 max 2 max 0.75 max 0.045 max 0.030 max 16 - 18 2 - 3 10 - 14 0.10 max
SS 317 008 max 2 max 1 max 0.040 max 0.03 max 18 - 20 3 - 4 11 - 14 0.10 max
SS 317L 0.035 max 2 max 1 max 0.040 max 0.03 max 18 - 20 3 - 4 11 - 15 -
SS 321 0.08 max 2 max 0.75 max 0.045 max 0.03 max 17 - 19 5xC min
0.60% max
9 - 12 0.10 max
SS 321H 0.04 - 0.10 max 2 max 0.75 max 0.045 max 0.03 max 17 - 19 4xC min
0.60% max
9 - 12 0.10 max
SS 347 0.08 max 2 max 0.75 max 0.045 max 0.03 max 17 - 20 10xC min
1.00 max
9 - 13 62.74
SS 347H 0.04 – 0.10 2 max 0.75 max 0.045 max 0.03 max 17 - 20 8xC min
1.00 max
9 - 13 62.74
SS 446 0.2 max 1.5 max 0.75 max 0.040 max 0.03 max 23 – 30 0.10 – 0.25 0.50 max Balance

Stainless Steel Melting Point, Density and Tensile Strength

Grade Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
SS 304 8.0 g/cm3 1400 °C (2550 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
SS 304L 8.0 g/cm3 1400 °C (2550 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 40 %
SS 310 8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
SS 310S 8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
SS 316 8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
SS 316L 8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 40 %
SS 317 8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
SS 317L 8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
SS 321 8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
SS 321H 8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
SS 347 8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 40 %
SS 347H 8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 40 %
SS 446 7.5 g/cm3 1510 °C (2750 °F) Psi – 75,000 , MPa – 485 Psi – 40,000 , MPa – 275 20 %

Inconel vs stainless steel strength

Stainless Steel

Like plain steel, the term stainless steel can be applied to a wide variety of different alloys. A key characteristic of stainless steel is its protective oxide layer - which continuous exposure to extreme temperatures can damage.

There are many grades available in stainless steel, but let’s take a quick look at some of the most commonly used SS grades:

  • Grade 304 Stainless Steel. Resistant to oxidation damage at temperatures of up to 1,697°F (952°C). At 2,000°F, this alloy will experience significant loss of corrosion resistance and tensile strength.
  • Grade 316 Stainless Steel. While more resistant to chemical corrosion at room temperature than 304 SS, 316 SS is actually a bit less resistant to high temperatures than 304 is. At 2,000°F, this alloy loses even more tensile strength than 304 does.
  • Grade 330 Stainless Steel. This stainless steel alloy is specifically formulated to resist the effects of scaling and oxidation at high temperatures. The high chromium and nickel content of this alloy helps it withstand prolonged exposure to temperatures of up to 1,900°F (1037°C). Some might recommend it for use at 2,000°F, but at that point it’s usually better to use Inconel® instead.

Inconel vs stainless steel weight

Inconel alloy have lighter weight than stainless steel. Although the appearance of stainless and Inconel might be the same, the difference in weight is obvious.

People also search for:

Inconel and stainless steel, welding inconel and stainless steel, inconel stainless steel galvanic corrosion, inconel stainless steel properties, difference between inconel and stainless steel, inconel vs stainless steel valves, inconel vs stainless steel exhaust, inconel 718 stainless steel, inconel 600 stainless steel, inconel vs stainless steel price, inconel vs stainless steel hardness, inconel vs stainless steel cost, what is the difference between inconel and stainless steel, price difference between inconel and stainless steel, inconel stainless steel welding, inconel vs stainless steel weight, inconel 718 vs stainless steel 316.

There's a world of steel & metals, Click on the below articles to check out the differences & learn more.

Looking to buy Inconel 600 Tube? Alloy 600 Tube?

Check price of Inconel 600 Tube in India

Inconel 600 Tube