UNS S35045 is the UNS number for Incoloy alloy 803, an iron-nickel-chromium alloy with 32.0 to 37.0 percent nickel and 25.0 to 29.0 percent chromium, used in petrochemical, chemical and thermal processing plant.

What is the chemical composition of UNS S35045?

Nickel 32.0 to 37.0 percent, chromium 25.0 to 29.0 percent, carbon 0.06 to 0.10 percent, aluminium 0.15 to 0.60 percent, titanium 0.15 to 0.60 percent, manganese 1.50 percent maximum, silicon 1.00 percent maximum, copper 0.75 percent maximum, sulfur 0.015 percent maximum, iron balance.

Which ASTM standards cover UNS S35045?

Forgings are covered by ASTM A182, plate sheet and strip by ASTM A240 and A480, seamless pipe and tube by ASTM A213, and welded tube by ASTM A249.

Why is UNS S35045 used in ethylene furnaces?

The high nickel and chromium content gives resistance to oxidation, sulfidation and carburization at high temperature, and the alloy keeps useful stress-rupture strength, so it is specified for ethylene furnace piping.

Who supplies UNS S35045 open-die forgings?

Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, forges UNS S35045 rings, flanges, bars, discs, sleeves, tube sheets and shafts to customer drawing. Telephone +86-189-2135-9659, email sales@steelforgepieces.com.

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UNS S35045 Forgings (Incoloy 803 / Alloy 803)

Q: Is UNS S35045 the same as Incoloy 803?

Yes. UNS S35045 is the UNS number. Incoloy 803, also written Alloy 803, is the industry name for the same alloy.

Forged rings, rolled rings, flanges, round bars, discs, sleeves, bushings, tube sheets and shafts, made to drawing by Jiangyin Jiangnan Metal Co., Ltd.

UNS S35045 is the UNS number for Incoloy alloy 803, an iron-nickel-chromium alloy with 32.0 to 37.0% nickel and 25.0 to 29.0% chromium. It goes into petrochemical, chemical and thermal processing plant, including ethylene furnace piping, because it resists oxidation, sulfidation and carburization at high temperature and keeps useful stress-rupture strength. Jiangyin Jiangnan Metal Co., Ltd. forges this grade at its works in Jiangyin, Jiangsu Province, China, and supplies it with EN 10204 3.1 or 3.2 certificates.

Grade data at a glance

Identification and physical data for UNS S35045
UNS number	S35045
Other names	Incoloy 803, Incoloy alloy 803, Alloy 803
Alloy type	Iron-nickel-chromium superaustenitic alloy
Density	7.86 g/cm3 (0.285 lb/in3)
Melting range	1365-1400 C (2490-2555 F)
Specific heat	479 J/kg.C (0.114 Btu/lb.F)
Elastic modulus	200 GPa (29,000 ksi)
Thermal conductivity	12 W/m.K
Thermal expansion	16 micrometre/m.K
Magnetic permeability	1.001 at 200 oersted

Chemical composition of UNS S35045

Composition limits, percent by weight
Element	Content, %
Nickel, Ni	32.0 - 37.0
Chromium, Cr	25.0 - 29.0
Carbon, C	0.06 - 0.10
Aluminium, Al	0.15 - 0.60
Titanium, Ti	0.15 - 0.60
Manganese, Mn	1.50 max
Silicon, Si	1.00 max
Copper, Cu	0.75 max
Sulfur, S	0.015 max
Iron, Fe	Balance, about 29.4 - 42.6

The aluminium and titanium additions are what separate this grade from plain Fe-Ni-Cr alloys. Together with the 25 to 29% chromium they support the protective surface oxide that the alloy relies on in carburizing and sulfidizing atmospheres.

Mechanical properties of UNS S35045

Room temperature, annealed condition
Property	Metric	Imperial
Tensile strength	572 - 607 MPa	83 - 88 ksi
Yield strength	275 - 296 MPa	40 - 43 ksi
Elongation	43 - 47 %	43 - 47 %
Shear strength	370 MPa	54 ksi
Fatigue strength	170 MPa	24 ksi
Poisson ratio	0.28	0.28

Other published data sets quote lower typical figures for the annealed condition, around 540 MPa tensile, 190 MPa yield and 39% elongation. The spread comes from product form, section size and heat treatment route. Acceptance values are fixed per order and reported on the mill certificate.

Standards and product forms

Standards commonly called up for S35045
Product form	Standard
Forgings	ASTM A182
Plate, sheet and strip	ASTM A240, ASTM A480
Seamless pipe and tube	ASTM A213
Welded tube	ASTM A249

If your specification calls up a different standard or a national equivalent, send us the clause and we will confirm in writing whether we can meet it before melting starts.

What we forge in UNS S35045

Rings and discs

Rolled rings, forged rings, discs, blanks and tube sheets for heat exchangers, columns, towers and pressure vessels.

Flanges and valve parts

Flanges, valve bodies, seat rings, blocks and stems for ball, gate, globe, check and plug valves.

Bars and shafts

Round bars, shafts, spindles, eccentric shafts and gear blanks for pumps, compressors, turbines and gearboxes.

Hollow parts

Sleeves, bushings, hollow bars, forged pipes and nozzles for furnace and process module assemblies.

Typical service

Ethylene furnace piping and related high temperature pipework.
Petrochemical and chemical plant: furnace outlet components, headers, reformer hardware, thermal processing fixtures.
Pressure equipment: tube sheets, shell and tube heat exchanger forgings, vessel nozzles, air receivers.
Rotating and static equipment running in oxidizing, sulfidizing or carburizing atmospheres: pump shafts, sleeves, bushings, gear blanks.

How we make and check these forgings

Melting by EAF plus VOD, with ESR remelt where cleanliness or segregation control matters.
Open-die forging and ring rolling to your drawing, with forging ratio and grain flow agreed before we start.
Solution treatment, plus ageing where the specification asks for it.
Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388.
EN 10204 3.1 works certificate, or 3.2 countersigned by a third party such as TUV, SGS, BV or Lloyd's.
PMI, dye penetrant, hardness survey, tensile and impact testing on request.

Questions we are asked about this grade

Is UNS S35045 the same as Incoloy 803?

Yes. UNS S35045 is the UNS number and Incoloy 803, also written Alloy 803, is the industry name for the same iron-nickel-chromium alloy with 32 to 37% nickel and 25 to 29% chromium.

Is it a stainless steel or a nickel alloy?

It sits on the line between the two. The S prefix in the UNS number puts it with the superaustenitic stainless steels, but at 32 to 37% nickel it is bought and sold alongside nickel alloys such as Incoloy 800H and 800HT. We list it under stainless steel for that reason.

What makes it suitable for carburizing service?

The 25 to 29% chromium and 32 to 37% nickel, with the aluminium and titanium additions, support a stable protective oxide. Published data credits the alloy with resistance to oxidation, sulfidation and carburization at high temperature along with good stress-rupture strength.

What sizes can you forge?

That depends on the geometry and the finished weight. Send a drawing, or the rough dimensions with the standard and test scope, and we will confirm whether we can make it and at what price.

What do you need in order to quote?

Grade, standard, finished or rough dimensions or a drawing, quantity, heat treatment condition, NDT and certificate requirement, and the delivery port. We normally reply within one working day.

Which other grades get compared with this one?

Buyers looking at high temperature service also price Incoloy 800H, Incoloy 800HT, Alloy 45TM, AISI 330, Inconel 601 and Alloy 602. We forge all of them.

Ask for a price on UNS S35045 forgings

We are the forging factory, not a trading office. Send your drawing or dimensions and the quotation comes back from the people who will run the job.

Address: No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Telephone: +86-189-2135-9659
Email: sales@steelforgepieces.com

Related grades we forge

Incoloy 800H Incoloy 800HT Incoloy 800 Alloy 45TM Inconel 601 Alloy 602 Inconel 617 AISI 330 Sanicro 28 904L A182 F44 Alloy 24

Maintained by the technical sales team at Jiangyin Jiangnan Metal Co., Ltd. Last updated 8 October 2026. Composition, property and standards data is compiled from published alloy datasheets and is given for guidance. The governing documents for any order are the purchase specification and the mill certificate issued with the goods.