Incoloy Alloy 20 is a nickel-iron-chromium austenitic alloy that was developed for maximum resistance to acid attack, specifically sulfuric acid. This superalloy has excellent resistance to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides and sulfuric, phosphoric, and nitric acids. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion. Carpenter 20 combines excellent corrosion resistance with elevated mechanical properties and relatively easy fabrication. Although originally designed for use in sulfuric acid related industries, Alloy 20 is now a popular choice for a wide variety of industries including the chemical, food, pharmaceutical, and plastics industries. In addition, this superalloy is used in heat exchangers, mixing tanks, metal cleaning and pickling equipment, and piping.

Alloy 20 Chemical Composition, %:

Ni	Fe	Cr	Cu	Mo	Nb	C	Mn	P	S	Si
32.0-38.0	Balance	19.0-21.0	3.0-4.0	2.0-3.0	8XC-1.0 max	0.07 max	2.0 max	0.045 max	0.035 max	1.0 max

Alloy 20 ASTM Specification:

Pipe Smls	Pipe Welded	Tube Smls	Tube Welded	Sheet / Plate	Bar	Forging	Fitting
B729	B464	B729	B468	B463	B473	B462	B366

Mechanical Properties of Alloy 20:

Product form	Tensile (ksi) Min	0.2 % Yield (ksi)	Elongation (%)
Bar (hot or Cold Finished)	80	35	30
Sheet/Plate	80	35	30

Incoloy Alloy A-286 (sometimes referred to as A286 stainless steel) is a nickel and iron-based, austenitic superalloy that is useful for applications requiring high strength and corrosion resistance up to 1300˚F (704˚C), and for lower stress applications at higher temperatures. The mechanical properties of this alloy are developed by suitable solution annealing and precipitation hardening treatments. This alloy has excellent high temperature oxidation resistance and is designed to maximize creep and stress rupture properties, with some reduction in strength. A-286 material can attain high strength levels when aged after cold work, and has wide applications in high temperature fasteners and springs.

Incoloy A-286 Chemical Composition, %:

C

Mn

P

S

Si

Cr

Ni

Mo

Ti

V

Al

B

Fe

0.08 max

2.0 max

0.025 max

0.025 max

1.0 max

13.5-16.0

24.0-27.0

1.0-1.5

1.90-2.35

0.1-0.5

0.35 max

0.003-0.010

Balance

Mechanical Properties of Incoloy A-286:

Annealed Typical

Ultimate Tensile Strength	90000 psi or 620 Mpa
Yield	(0.2 % offset) 40000 psi or 275 Mpa
Elongation	40 %

Incoloy 330 is a steel alloy that is high in nickel and chromium. It provides good resistance to carburization, oxidation, and nitridation. RA 330 is also easily welded using all conventional processes; it can be formed hot (between 1750-1200° F) and cold.

Incoloy 330 Chemical Composition, %:

Cr

Ni

C

Mn

P

S

Si

Mo

Cu

Ti

Fe

Sn

Pb

17.0-22.0

34.0-37.0

0.08 max

2.00 max

0.03 max

0.03 max

0.75-1.50

1.00-1.75

1.00 max

1.90-2.30

Balance

0.025

0.005 max

Mechanical Properties of Incoloy 330:

Product form	Condition	Ultimate Tensile Strength (ksi)	0.2 % Yield (ksi)	Elongation (%)
Bar	Hot Finished and Annealed	80-90	35-45	38-45
Plate	Hot Rolled and Annealed	80-85	30-43	40-45
Sheet	Cold Rolled and Annealed	80-90	32-42	35-45

Incoloy 800, 800H, and 800HT are nickel-iron-chromium alloys with good strength and excellent resistance to oxidation and carburization in high-temperature exposure. These nickel steel alloys are identical except for the higher level of carbon in alloy 800H, and the addition of up to 1.20 percent aluminum and titanium in alloy 800HT. Incoloy 800 was the first of these alloys and it was slightly modified into Incoloy 800H. This modification was to control carbon (.05-.10%) and grain size to optimize stress rupture properties. Incoloy 800HT has further modifications to the combined titanium and aluminum levels (.85-1.20%) to ensure optimum high temperature properties. The nickel alloy is dual certified (800H/HT) and combines the properties of both forms. Incoloy 800H/HT alloy was intended for high temperature structural applications. The nickel content makes the alloys highly resistant to both chloride stress-corrosion cracking and to embrittlement from precipitation of sigma phase. The general corrosion resistance is excellent. In the solution annealed condition, alloys 800H and 800HT have superior creep and stress rupture properties.

Incoloy 800 Chemical Composition, %:

Ni	Cr	Fe	C	Al	TI	Al+Ti
30.0-35.0	19.0-23.0	39.5 min	0.10 max	0.15-0.60	0.15-0.60	0.30-1.20

Incoloy 800H Chemical Composition, %:

Ni	Cr	Fe	C	Al	TI	Al+Ti
30.0-35.0	19.0-23.0	39.5 min	0.05-0.10	0.15-0.60	0.15-0.60	0.30-1.20

Incoloy 800HT Chemical Composition, %:

Ni	Cr	Fe	C	Al	TI	Al+Ti
30.0-35.0	19.0-23.0	39.5 min	0.06-0.10	0.25-0.60	0.25-0.60	0.85-1.20

Mechanical Properties of Incoloy 800/800H/800HT:

Product Form	Tensile Min. (ksi)	0.2% Yield Min. (ksi)	Elongation %
Rod & Bar	75-100	30-60	60-30

Incoloy 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. This nickel steel alloy’s chemical composition is designed to provide exceptional resistance to many corrosive environments. It is similar to alloy 800 but has improved resistance to aqueous corrosion. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. Alloy 825 is especially resistant to sulfuric and phosphoric acids. This nickel steel alloy is used for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.

Incoloy 825 Chemical Composition, %:

Ni	Fe	Cr	Mo	Cu	Ti	C	Mn	S	Si	Al
38.0-46.0	22.0 min	19.5-23.5	2.5-3.5	1.5-3.0	0.6-1.2	0.05 max	1.0 max	0.03 max	0.5 max	0.2 max

Mechanical Properties of Incoloy 825:

Tensile	85 ksi
Yield	(0.2 % offset) 30-35 ksi

Incoloy alloy 925 is an age hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminum. The nickel content is sufficient for protection against chloride-ion stress corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing chemicals. The molybdenum aids resistance to pitting and crevice corrosion. The alloy’s chromium content provides resistance to oxidizing environments. The titanium and aluminum additions cause a strengthening reaction during heat treatment.

Incoloy 925 Chemical Composition, %:

Ni	Cr	Fe	Mo	Cu	Ti	Al	Mn	Si	Nb	C	S
42.0-46.0	19.5-22.5	22 min	2.5-3.5	1.5-3.0	1.9-2.4	0.1-0.5	1.0 max	0.5 max	0.5 max	0.03 max	0.03 max

Mechanical Properties of Incoloy 925:

Ultimate Tensile Strength	175000 psi
Yield	(0.2 % offset) 117000  psi
Elongation	24 %