Incoloy Alloy 903 (UNS N19903) Forgings & Properties Guide

Q: What is the chemical composition of UNS N19903?

The limiting composition of Incoloy Alloy 903 is 36.0 to 40.0 percent nickel, 13.0 to 17.0 percent cobalt, 2.40 to 3.50 percent niobium, 1.00 to 1.85 percent titanium and 0.30 to 1.15 percent aluminium, with iron as the balance at roughly 41 percent. Chromium is not an intentional addition, which is what permits the low expansion coefficient and also limits uncoated oxidation resistance.

Q: Which forged shapes can be supplied in Incoloy Alloy 903?

Jiangyin Jiangnan Metal supplies Incoloy Alloy 903 as seamless rolled rings, forged round and flat bars, discs and blocks, hollow bars and sleeves, shafts and stepped shafts, turbine seal rings and shrouds, compressor and turbine casings, valve stems and spindles, and near-net-shape blanks to customer drawing. Ring outside diameters run from about 100 mm to 3500 mm and single-piece weights from 5 kg to 8000 kg.

§01What Incoloy Alloy 903 is

Incoloy Alloy 903 was developed for turbine and rocket hardware that has to hold close running clearances through large temperature swings. Most superalloys expand too much for that duty. Alloy 903 expands at about 7.2 µm/m/°C from room temperature to 425 °C, against about 18 µm/m/°C for 304 stainless steel over the same range, and its modulus of elasticity stays within a few percent of 150 GPa from −196 °C to 500 °C.

The low expansion comes from the chemistry. Chromium raises thermal expansion, so it is left out. Nickel, cobalt and iron are balanced near the Invar composition, which suppresses expansion below the Curie temperature. Strength is then developed by precipitation hardening with niobium, titanium and aluminium, the same mechanism used in Inconel 718.

Design limitation. Because Alloy 903 contains no chromium, it does not form a protective chromia scale. It is specified for dimensional stability, not for corrosion resistance. An aluminide or overlay coating is normally applied for sustained service above 540 °C in oxidising atmospheres. Oxidation data is given in section 7.

Position among the low-expansion grades

Alloy 903 is the first of the Incoloy 900-series low-expansion alloys, followed by Alloy 907 and Alloy 909. All three use the same nickel-iron-cobalt base. Alloys 907 and 909 contain silicon additions that improve notch stress-rupture behaviour. Alloy 903 has the highest room-temperature strength of the three. A grade comparison is given in section 12.

§02Thermal expansion behaviour

The chart below plots the mean coefficient of thermal expansion measured from room temperature up to each indicated temperature. Alloy 903 is shown against two alloys often considered for the same components.

Mean coefficient of thermal expansion from room temperature to the indicated temperature. Alloy 903 data follows the Special Metals technical bulletin for INCOLOY alloy 903. Inconel 718 and 304 stainless values are typical published figures shown for comparison. Actual values vary with heat and thermal history. Design to the certified data on the mill test certificate.

Table 2.1 Mean coefficient of thermal expansion, µm/m/°C, RT to temperature shown
Temperature	Incoloy Alloy 903	Inconel 718, typical	304 stainless, typical
100 °C	7.1	13.0	16.6
200 °C	7.2	13.4	17.2
300 °C	7.2	13.8	17.6
425 °C	7.3	14.3	18.1
500 °C	9.2	14.7	18.4
600 °C	11.2	15.3	18.7
650 °C	12.0	15.6	18.9

Reproducibility

Expansion behaviour is stable under both static and cyclic exposure. Published data show no measurable change in expansion coefficient after 500 hours at 595 °C. Fifty cycles of heating to 650 °C, holding 15 minutes and air cooling reproduced the expansion curve to within 1 percent. Together with the flat modulus curve, this gives the alloy good resistance to thermal fatigue and thermal shock.

§03Chemical composition of UNS N19903

Table 3.1 gives the limiting composition of Incoloy Alloy 903 in weight percent. Chromium is not an intentional addition.

Table 3.1 Limiting chemical composition of Incoloy Alloy 903 (UNS N19903), wt %
Element	Minimum	Maximum	Nominal	Function
Nickel, Ni	36.0	40.0	38	Sets the Invar-type low-expansion matrix
Cobalt, Co	13.0	17.0	15	Raises the Curie temperature and extends the low-expansion range
Niobium, Nb	2.40	3.50	3.0	Primary precipitation hardener, gamma double prime
Titanium, Ti	1.00	1.85	1.4	Secondary hardener, gamma prime
Aluminium, Al	0.30	1.15	0.9	Secondary hardener, held low to protect expansion behaviour
Iron, Fe	—	—	Balance, approx. 41	Base of the Fe-Ni-Co matrix
Chromium, Cr	—	—	Not added	Excluded because it would raise expansion

A balance figure does not guarantee that the remainder is exclusively iron. It means iron predominates and residual elements are present only in minimal quantities. Melting is normally VIM, or VIM plus VAR for aerospace work. State the required melt route on the enquiry.

§04Physical and thermal properties

Table 4.1 Physical constants, age-hardened Incoloy Alloy 903
Property	Metric	Imperial
Density	8.25 g/cm³	0.298 lb/in³
Melting range	1318–1393 °C	2405–2539 °F
Curie temperature	416–471 °C	780–880 °F
Mean CTE, RT to 425 °C	7.2 µm/m/°C	4.0 × 10⁻⁶ in/in/°F
Modulus of elasticity at 0 °C	146.8 GPa	21 290 ksi
Poisson's ratio at 250 °C	0.226	0.226

Table 4.2 Thermal properties against temperature, age-hardened condition
Temperature	Specific heat, J/kg·°C	Electrical resistivity, µΩ·m	Thermal conductivity, W/m·°C
50 °C	442	0.650	16.9
100 °C	454	0.735	17.2
200 °C	482	0.880	17.9
300 °C	507	1.020	18.3
400 °C	532	1.135	19.0
500 °C	559	1.195	20.3
600 °C	584	1.220	21.9

§05Modulus of elasticity

Modulus of elasticity changes little with temperature. Between −196 °C and 500 °C the tensile modulus stays within about 3 percent of 150 GPa. For springs, gauge blocks, bolted joints and rotor clearances this means load-deflection behaviour is close to identical cold and hot.

Table 5.1 Dynamic modulus of elasticity and Poisson's ratio, age-hardened Alloy 903
Temperature	Tensile modulus, GPa	Tensile modulus, 10³ ksi	Torsional modulus, GPa	Poisson's ratio
−196 °C	148.9	21.59	—	—
−50 °C	146.9	21.34	—	—
0 °C	146.8	21.29	—	—
50 °C	146.9	21.30	59.3	0.239
100 °C	147.2	21.35	59.0	0.247
200 °C	148.4	21.52	60.3	0.231
250 °C	149.3	21.67	60.9	0.226
300 °C	150.2	21.84	61.2	0.227
400 °C	152.4	22.18	61.4	0.241
500 °C	153.9	22.10	59.2	0.300
600 °C	149.8	21.43	55.4	0.352

§06Mechanical properties

All values below are for material in the fully age-hardened condition, heat treated at 845 °C for 1 hour and water quenched, then aged at 720 °C for 8 hours, furnace cooled at 56 °C per hour to 620 °C for 8 hours and air cooled.

Table 6.1 Typical tensile properties, age-hardened Incoloy Alloy 903
Test temperature	Yield strength, 0.2 % offset	Tensile strength	Elongation	Reduction of area
21 °C, 70 °F	1103 MPa, 160 ksi	1310 MPa, 190 ksi	14 %	40 %
650 °C, 1200 °F	896 MPa, 130 ksi	1000 MPa, 145 ksi	18 %	55 %

Properties after long exposure

Room-temperature properties measured after 1000 hours at elevated temperature show that Alloy 903 is metallurgically stable up to about 650 °C. Impact strength does not fall, which indicates no deleterious phase formation over that period.

Table 6.2 Room-temperature properties after 1000 h exposure at temperature
Exposure temperature	Yield, MPa	Tensile, MPa	Elongation, %	Reduction of area, %	Impact, J
None, as aged at 21 °C	1141	1369	17	43	32.5
595 °C, 1100 °F	1169	1382	16	44	33.9
650 °C, 1200 °F	1027	1276	19	47	35.3
705 °C, 1300 °F	738	1027	20	41	—

Stress rupture and fracture toughness

Stress rupture: the typical stress to produce rupture in 100 hours at 650 °C is 586 MPa, or 85 ksi. Rupture life depends strongly on thermomechanical processing, covered in section 9.
Plane-strain fracture toughness, K_IC: approximately 111 MPa·m^0.5, or 100.6 ksi·in^0.5, at room temperature, average of three tests.
Comparative strength: age-hardened Alloy 903 is approximately twice as strong as annealed Inconel 600.

Purchasing note. The 100-hour rupture figure above is only achievable if the finishing reduction is controlled. A forging finished too hot can meet the tensile requirement and still fall short on rupture. Jiangyin Jiangnan Metal records finish-forging temperature on every Alloy 903 heat and reports it with the mill test certificate.

§07Oxidation resistance

Alloy 903 contains no chromium and does not form a protective chromia scale of the kind that gives Inconel 625 or Incoloy 800H their oxidation resistance. Attack is measurable, though not severe, in the 540 to 650 °C band.

Table 7.1 500-hour static oxidation resistance of Incoloy Alloy 903
Test temperature	Weight gain, mg/cm²	Depth of attack, cm	Depth of attack, in
540 °C, 1000 °F	0.7	0.0038	0.0015
595 °C, 1100 °F	2.2	0.0064	0.0025
650 °C, 1200 °F	2.7	0.0102	0.0040

Table 7.2 Cyclic oxidation, weight gain in mg/cm², 15 min heating and 5 min air cooling
Cyclic exposure	540 °C	595 °C	650 °C
100 h	0.32	0.6	1.1
200 h	0.38	0.7	1.9
300 h	0.40	0.9	2.4
400 h	0.43	1.0	3.0
500 h	0.48	1.1	3.6

For short-duration or moderate-temperature service, uncoated Alloy 903 is normally acceptable. For sustained hot-section service a protective coating should be specified. Aluminide diffusion coatings are commonly used on turbine seal rings and shrouds.

§08Heat treatment of Alloy 903 forgings

Alloy 903 is supplied either solution treated, for customers who will machine and then age the part themselves, or fully precipitation hardened. The reference cycle is a solution treatment followed by a two-step age with a controlled furnace cool between the steps.

Table 8.1 Reference heat-treatment cycle for Incoloy Alloy 903
Step	Operation	Temperature	Time	Cooling
1	Solution treatment	815–980 °C, commonly 845 °C	1 h	Water quench
2	First age	720 °C, 1325 °F	8 h	Furnace cool at 56 °C/h
3	Controlled cool	720 to 620 °C	approx. 1.8 h	Furnace cool
4	Second age	620 °C, 1150 °F	8 h	Air cool

The solution temperature chosen within the 815 to 980 °C window depends on product form and prior condition. Heavier forgings and material that has seen little hot work generally take the upper end of the range. Confirm the intended cycle on the purchase order so that it appears on the certificate.

Annealing

For a simple soften without ageing, anneal at 845 °C for one hour. Material supplied in this condition typically runs around HRC 25 to 32 and machines considerably more easily than the aged condition.

§09Forging, machining and joining practice

Table 9.1 Fabrication parameters for Incoloy Alloy 903
Operation	Parameter	Notes
Hot working range	815–1120 °C, 1500–2050 °F	Softer than Inconel X-750 between 870 and 1095 °C, so press loads are lower
Finishing reduction for rupture life	40 % minimum at 816–871 °C	Required where high stress-rupture properties are specified
Solution treatment	815–980 °C	See section 8
Machining group	Group D-2 practice	Machine in either the solution-treated or aged condition
Welding	GTAW preferred	Also weldable by GMAW, SAW and SMAW. Age after welding to restore properties
Cold forming	Heavy-duty lubricants required	Soft die materials such as bronze reduce galling

Process control. Stress-rupture properties of Alloy 903 are governed by thermomechanical processing as well as by chemistry. Two forgings from one heat can both meet the tensile requirement and differ in rupture life if finishing reduction and finish temperature differ. It is worth asking any supplier to state the finishing reduction on the certificate.

§10Incoloy Alloy 903 forged shapes supplied

Jiangyin Jiangnan Metal Co., Ltd. produces the following Alloy 903 (UNS N19903) shapes to customer drawing, or to rough dimensions where the customer applies their own machining allowance.

Rings

Seamless rolled rings, forged rings, turbine seal rings, shrouds, spacer rings and flanged rings.

Bars

Forged round bar, square bar, rectangular and flat bar, stepped shafts, valve stems and spindles, turbine blade stock.

Discs and blocks

Forged discs, disks, blisks, impeller and wheel blanks, plates and rectangular blocks.

Hollow sections

Hollow bars, sleeves, bushes and bushings, barrels, cylinders, hubs, housings and casing blanks.

Casings and shells

Compressor and turbine casings, cases, shells and near-net-shape structural blanks.

Custom

Open-die and near-net-shape forgings to drawing, including proof-machined and rough-turned deliveries.

Table 10.1 Size envelope for Alloy 903 forgings
Shape	Size range	Delivery condition
Seamless rolled rings	OD 100–3500 mm, wall 20–500 mm, height 20–1200 mm	Solution treated or precipitation hardened
Round bar	Ø 20–800 mm, length up to 6000 mm	Black forged, rough turned or peeled
Flat and rectangular bar	Thickness 20–600 mm, width up to 1200 mm	Black forged or machined all over
Discs and blocks	Diameter or across flats up to 2000 mm	Rough machined to drawing
Hollow bar and sleeves	OD 120–1500 mm, ID from 60 mm	Bored and rough turned
Single-piece weight	5 kg to 8000 kg	—

§11Factory capability and quality control

Alloy 903 has a narrow forging window and a long ageing cycle, and its rupture properties depend on process discipline rather than on chemistry alone. The controls below are applied by Jiangyin Jiangnan Metal to every Alloy 903 order.

Table 11.1 Process and inspection controls applied to Incoloy Alloy 903 forgings
Stage	Control
Incoming material	Heat number and EN 10204 3.1 certificate cross-checked against the melt supplier. Melt route, VIM or VIM plus VAR, verified against the order
Billet heating	Multi-zone furnaces with calibrated thermocouples and alarms on any zone deviating from the set point
Forging	Pyrometric measurement at start and during forging to keep the piece inside the hot-working window. Material below the minimum temperature is returned to the furnace
Finishing reduction	Recorded and reported where stress-rupture properties are specified
Heat treatment	In-house solution treatment and double age with recorded charts. Furnace uniformity surveyed to AMS 2750
Chemical analysis	Spectrographic verification per ASTM E1473
Mechanical testing	Room-temperature and elevated-temperature tensile, hardness and impact. Stress-rupture testing on request
Non-destructive testing	Ultrasonic to ASTM A388 or EN 10228-3, dye penetrant to ASTM E1417, magnetic particle where applicable
Dimensional	Full dimensional inspection against drawing. Straightness 1.5 mm/m maximum on bars as standard
Documentation	EN 10204 3.1 as standard. 3.2 with TUV, SGS, BV or Lloyd's Register witness on request

§12Alloy 903 compared with 907, 909 and Invar 36

Enquiries for Alloy 903 are often placed against Alloy 909, and the reverse. Table 12.1 sets out the practical differences.

Table 12.1 Low-expansion alloy comparison
Property	Incoloy 903	Incoloy 907	Incoloy 909	Invar 36
UNS	N19903	N19907	N19909	K93600
Nominal Ni	38 %	38 %	38 %	36 %
Nominal Co	15 %	13 %	13 %	—
Silicon addition	No	Yes, approx. 0.15 %	Yes, approx. 0.4 %	No
Precipitation hardened	Yes	Yes	Yes	No
RT tensile, aged	approx. 1310 MPa	approx. 1170 MPa	approx. 1310 MPa	approx. 490 MPa
Notch rupture behaviour	Notch sensitive	Improved	Best of the three	Not applicable
Typical service ceiling	approx. 650 °C	approx. 650 °C	approx. 650 °C	approx. 200 °C
Typical use	Rocket thrust chambers, springs, bolts, gauge blocks	Turbine rings and casings	Turbine seal rings, shrouds and casings, the most widely specified today	Metrology, cryogenic tanks, optical benches

Alloy 903 gives the highest room-temperature strength and the classic low-expansion response. Alloy 909 is preferred where notched components carry sustained rupture loading. Invar 36 is used where dimensional stability is required and strength is not. Jiangyin Jiangnan Metal forges all four grades.

§13Applications of Incoloy Alloy 903

Aerospace propulsion

Rocket-engine thrust chambers
Gas-turbine seal rings and shrouds
Compressor and turbine casings
Exhaust ducting and structural rings

Power generation

Steam-turbine bolts and studs
Valve spindles and stems
Turbine discs, wheels and impellers
Blade root and shroud hardware

Precision and instrument

Gauge blocks and metrology fixtures
Constant-rate springs and diaphragms
Die-casting sleeves paired with ceramics

Defence and industrial

Ordnance hardware
High-stability fasteners
Thermal-shock-resistant tooling

§14Frequently asked questions

What is Incoloy Alloy 903?

Incoloy Alloy 903 (UNS N19903) is an age-hardenable nickel-iron-cobalt superalloy. Its principal characteristics are a low and nearly constant coefficient of thermal expansion, a nearly constant modulus of elasticity, and high strength at temperatures up to about 650 °C. The nominal composition is 38 % nickel, 15 % cobalt, 3 % niobium, 1.4 % titanium, 0.9 % aluminium, balance iron. Jiangyin Jiangnan Metal Co., Ltd. forges Alloy 903 into rings, bars, discs and shafts for gas-turbine and rocket-engine hardware.

Is Incoloy 903 the same as Inconel 903?

In practice, yes. The correct grade name is INCOLOY alloy 903, but drawings and purchase orders often use Inconel 903, Inco 903 or Alloy 903. All refer to UNS N19903. Jiangyin Jiangnan Metal accepts enquiries under any of these names and quotes against the UNS number and the applicable AMS specification.

What is the coefficient of thermal expansion of Incoloy Alloy 903?

Alloy 903 shows a typical mean coefficient of thermal expansion of about 7.2 µm/m/°C, equivalent to 4.0 × 10⁻⁶ in/in/°F, measured from room temperature to about 425 °C. That is roughly 40 % of the expansion of 304 stainless steel over the same range. Above the Curie temperature band of 416 to 471 °C the coefficient rises, so the low-expansion benefit is normally used below about 425 °C.

What is the chemical composition of UNS N19903?

The limiting composition is 36.0 to 40.0 % nickel, 13.0 to 17.0 % cobalt, 2.40 to 3.50 % niobium, 1.00 to 1.85 % titanium and 0.30 to 1.15 % aluminium, with iron as the balance at roughly 41 %. Chromium is not an intentional addition, which is what permits the low expansion coefficient and also limits uncoated oxidation resistance.

What is the correct heat treatment for Incoloy Alloy 903?

The reference cycle is a solution treatment in the 815 to 980 °C range, commonly 845 °C for 1 hour followed by a water quench, then an age at 720 °C for 8 hours, a furnace cool at 56 °C per hour to 620 °C, a hold of 8 hours and an air cool. Jiangyin Jiangnan Metal carries out this cycle in-house in furnaces surveyed to AMS 2750 and supplies the charts with the mill test certificate.

What are the mechanical properties of age-hardened Alloy 903?

Typical age-hardened room-temperature properties are 1310 MPa (190 ksi) tensile strength, 1103 MPa (160 ksi) yield strength at 0.2 % offset, 14 % elongation and 40 % reduction of area. At 650 °C the alloy gives about 1000 MPa tensile strength and 896 MPa yield strength. Room-temperature plane-strain fracture toughness is about 111 MPa·m^0.5.

At what temperature should Incoloy Alloy 903 be forged?

Alloy 903 should be hot worked in the 815 to 1120 °C range. Where high stress-rupture properties are required, the forging should receive a minimum of 40 % reduction at 816 to 871 °C, because the finishing reduction controls grain structure and therefore rupture life. Jiangyin Jiangnan Metal measures billet and finishing temperatures pyrometrically on every heat.

Why does Incoloy Alloy 903 sometimes need a protective coating?

Alloy 903 contains no chromium and does not form a protective chromia scale. In 500-hour static oxidation tests the weight gain rises from 0.7 mg/cm² at 540 °C to 2.7 mg/cm² at 650 °C. For sustained service above about 540 °C in an oxidising atmosphere, an aluminide or overlay coating is normally specified.

What is the difference between Incoloy 903, 907 and 909?

All three are low-expansion nickel-iron-cobalt superalloys from the same family. Alloy 903 is the original grade and has the highest room-temperature strength. Alloys 907 and 909 contain silicon additions that improve notch stress-rupture behaviour, and Alloy 909 is now the most widely specified of the three for gas-turbine rings and seals. Jiangyin Jiangnan Metal forges all three grades.

Which forged shapes can be supplied in Incoloy Alloy 903?

Jiangyin Jiangnan Metal supplies Alloy 903 as seamless rolled rings, forged round and flat bars, discs and blocks, hollow bars and sleeves, shafts and stepped shafts, turbine seal rings and shrouds, compressor and turbine casings, valve stems and spindles, and near-net-shape blanks to drawing. Ring outside diameters run from about 100 mm to 3500 mm and single-piece weights from 5 kg to 8000 kg.

What certification is issued with Alloy 903 forgings?

Every Alloy 903 forging is shipped with an EN 10204 3.1 mill test certificate as standard, covering heat number, full chemical analysis, mechanical test results, heat-treatment charts and NDT reports. EN 10204 3.2 certification with third-party witness by TUV, SGS, BV or Lloyd's Register is available on request.

How do I get a quotation for Incoloy Alloy 903 forgings?

Send the drawing or rough dimensions, quantity, specification and required delivery condition to sales@steelforgepieces.com, or call +86 189 2135 9659. Jiangyin Jiangnan Metal Co., Ltd. is located at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, and normally returns a quotation within 24 hours.

§15Request a quotation for Alloy 903 forgings

Include as much of the following as is available at enquiry stage.

Table 15.1 Information required with an Incoloy Alloy 903 enquiry
Item	Detail needed
Shape	Ring, bar, disc, sleeve, shaft, or drawing and STEP file
Dimensions	Finished or rough size, with machining allowance if known
Specification	AMS 5803, customer specification, or commercial to UNS N19903
Condition	Solution treated, or precipitation hardened
Melt route	VIM, or VIM plus VAR for aerospace
Testing	Tensile, impact, stress rupture, ultrasonic, penetrant, grain size
Certification	EN 10204 3.1 or 3.2 with named witness body
Quantity and schedule	Piece count and required delivery date

Email sales@steelforgepieces.com Call +86 189 2135 9659

§16About Jiangyin Jiangnan Metal Co., Ltd.

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. The company produces custom open-die forgings and seamless rolled rings in carbon steel, alloy steel, tool steel, stainless steel and nickel-based superalloys, including Incoloy Alloy 903 (UNS N19903), for gas turbine, power generation, oil and gas, aerospace and heavy machinery customers worldwide.

Jiangyin sits in the Yangtze River delta between Shanghai and Nanjing, in a district with one of the densest concentrations of forging and special-steel capacity in China. Raw-material lead times and shipping distance to Shanghai port are both short.

Company: Jiangyin Jiangnan Metal Co., Ltd.
Open-Die Forging Factory
Address: No.1 Chengxiqiao Road,
Zhouzhuang Town, Jiangyin City,
Jiangsu Province, China
Telephone: +86 189 2135 9659
Email: sales@steelforgepieces.com
Website: www.steelforgepieces.com
Capability: Open-die forgings and seamless rolled rings, 5 kg to 8000 kg single piece

§17Related nickel alloy grades

Incoloy grades

Inconel grades

Hastelloy and other grades

Forged shape categories

§18References and data sources

Property values on this page are drawn from published alloy producer data and public standards, cross-checked against production and test records at Jiangyin Jiangnan Metal. Where a value is typical rather than guaranteed, it is described as such.

Special Metals Corporation, INCOLOY alloy 903 technical bulletin, publication SMC-100. Source of composition limits, physical constants, thermal, thermoelastic, tensile and oxidation data reproduced above.
SAE International, AMS 5803, Alloy, Corrosion and Heat Resistant, Bars, Forgings and Rings, nickel-iron-cobalt low-expansion type.
ASTM International, ASTM E1473, Standard Test Methods for Chemical Analysis of Nickel, Cobalt and High-Temperature Alloys.
ASTM International, ASTM A388 / A388M, Standard Practice for Ultrasonic Examination of Steel Forgings.
SAE International, AMS 2750, Pyrometry, for heat-treatment furnace temperature uniformity surveys.
EN 10204, Metallic products, types of inspection documents.

Disclaimer. The data on this page is published for informational purposes. Typical values are not guaranteed minima. Design to the certified values on the mill test certificate supplied with the order and to the requirements of the governing specification. INCOLOY and INCONEL are trademarks of the Special Metals Corporation group of companies. HASTELLOY is a trademark of Haynes International. Jiangyin Jiangnan Metal Co., Ltd. is an independent forging manufacturer and is not affiliated with those companies. Grade names are used here only to identify material specifications.