Alloy 945 (UNS N09945) Forgings | Properties, Composition

Key data

Alloy 945 (UNS N09945), also supplied under the trade name Incoloy alloy 945, is an age-hardenable nickel-iron-chromium alloy used for high strength, corrosion resistant components in sour oil and gas wells.

Composition: 45.0 to 55.0% Ni, 19.5 to 23.0% Cr, 3.0 to 4.0% Mo, 2.5 to 4.5% Nb, 1.5 to 3.0% Cu, 0.5 to 2.5% Ti, balance Fe.
Strength: 125 ksi (862 MPa) minimum yield, 150 ksi (1034 MPa) minimum tensile, 18% minimum elongation, 32 to 42 HRC.
Sour service: approved under NACE MR0175 / ISO 15156-3 to Level VII and to Level VI at 450 F. No failures recorded in 90 day C-ring testing at 100% of yield stress.
Localised corrosion: critical pitting temperature of 50 C to ASTM G48, compared with 35 C for Alloy 925.
Forming: hot worked at 930 to 1150 C, with hot working characteristics similar to Alloy 718. Cold work up to 40% reduction.
Supply: Jiangyin Jiangnan Metal Co., Ltd. forges Alloy 945 bars, rings, discs, blocks and shafts up to 5,000 kg per piece. Contact sales@steelforgepieces.com.

What is Alloy 945 (UNS N09945)?

Alloy 945 is a high strength, corrosion resistant, age-hardenable nickel-iron-chromium alloy designed for use in the oil and gas industry, in particular for sour wells containing high levels of hydrogen sulfide, carbon dioxide and chlorides.

The nickel content of 45 to 55 percent provides resistance to chloride-induced stress corrosion cracking. Nickel in combination with molybdenum and copper provides resistance to general corrosion in reducing media. Molybdenum provides resistance to localised attack in the form of pitting and crevice corrosion. Chromium at 19.5 to 23.0 percent provides resistance in oxidizing environments.

Niobium, titanium and aluminium take part in the age hardening reaction that occurs during heat treatment. They form Ni₃(TiNbAl) type gamma prime and Ni₃(NbTiAl) type gamma double prime precipitates. These particles are sub-micron in size and are distributed uniformly through the austenitic matrix, which gives the alloy its strength.

In the annealed and aged condition the alloy has a minimum yield strength of 125 ksi (862 MPa), a minimum tensile strength of 150 ksi (1034 MPa), minimum elongation of 18 percent, minimum reduction of area of 25 percent and minimum impact energy of 40 ft-lb. Hardness is specified between 32 and 42 HRC.

Alloy 945 is approved under NACE MR0175 / ISO 15156-3 for oil and gas service to Level VII and to Level VI at 450 F (232 C). A higher strength grade, Alloy 945X, carries the same UNS number and has a minimum yield strength of 140 ksi (965 MPa).

Designations and equivalents

Table 1. Designations for Alloy 945
Designation type	Value
UNS number	N09945
Trade name	Incoloy alloy 945 and 945X (Special Metals Corporation)
Other names in use	Alloy 945, 945 alloy, N09945, 125K grade
Producer specifications	HA 119 (945), HA 123 (945X), HA 121 and HA 122 (shaft grade)
Product standard	ASTM B637, precipitation-hardening nickel alloy bars, forgings and forging stock
Sour service standard	NACE MR0175 / ISO 15156-3, Level VII and Level VI-450 F
Equipment standard	API 6A and API 6A718 Annex H, wellhead and Christmas tree equipment

Chemical composition of Alloy 945

The limiting chemical composition below follows Special Metals specification HA 119 for UNS N09945. The right hand column states the function of each element.

Nickel, 47%

Iron, about 21% (balance)

Chromium, 20.5%

Niobium, 3.3%

Molybdenum, 3.2%

Copper, 2.0%

Titanium, 1.5%

Al, Mn, Si, C, 1.5%

Table 2. Limiting chemical composition of Alloy 945, weight percent, per HA 119
Element	Symbol	Min %	Max %	Function
Nickel	Ni	45.0	55.0	Chloride stress corrosion cracking resistance
Chromium	Cr	19.5	23.0	Resistance in oxidizing environments
Iron	Fe	Balance		Matrix element
Molybdenum	Mo	3.0	4.0	Pitting and crevice corrosion resistance
Niobium	Nb	2.5	4.5	Gamma double prime age hardening
Copper	Cu	1.5	3.0	Resistance in reducing media
Titanium	Ti	0.5	2.5	Gamma prime age hardening
Aluminium	Al	0.01	0.7	Gamma prime formation, deoxidiser
Manganese	Mn	-	1.0	Deoxidiser, sulfur control
Silicon	Si	-	0.5	Deoxidiser
Carbon	C	0.005	0.04	Carbide formation, held low for corrosion resistance
Sulfur	S	-	0.03	Restricted element
Phosphorus	P	-	0.03	Restricted element

Physical properties of Alloy 945

Values are given at room temperature unless stated otherwise. The thermal conductivity of 10.9 W/m·C at room temperature is typical of nickel alloys and affects both machining practice and furnace soak times on heavy sections.

Table 3. Physical properties at room temperature
Property	Imperial	Metric
Density	0.296 lb/in³	8.2 g/cm³
Melting range	2317 to 2510 F	1270 to 1377 C
Young's modulus	29.1 x 10⁶ psi	200.8 GPa
Shear modulus at 70 F	10.8 x 10³ ksi	74 GPa
Poisson's ratio	0.31
Electrical resistivity	663 ohm·cmil/ft	1.10 microhm·m
Magnetic permeability at 200 Oe	1.003
Specific heat at 23 C	0.106 BTU/lb·F	445 J/kg·C
Thermal conductivity at 23 C	75.9 BTU·in/ft²·h·F	10.9 W/m·C
Mean coefficient of expansion, 25 to 93 C	7.88 x 10^-6 /F	14.19 x 10^-6 /C

Thermal properties against temperature

Table 4. Thermal conductivity, specific heat and mean coefficient of expansion
Temp C	Temp F	Conductivity W/m·C	Specific heat J/kg·C	Mean CTE x10^-6/C
23	73	10.9	445	-
100	212	12.5	467	14.24
200	392	14.4	491	14.36
300	572	16.4	515	14.69
400	752	18.4	540	15.12
500	932	20.3	563	15.39
600	1112	22.4	588	15.93
700	1292	23.9	607	16.32
800	1472	25.7	639	17.47
900	1652	26.2	670	18.01
1000	1832	28.0	688	-
1100	2012	29.5	690	-

Elastic moduli against temperature

Table 5. Tensile modulus, shear modulus and Poisson's ratio
Temp F	Temp C	Tensile modulus 10³ ksi	GPa	Shear modulus 10³ ksi	Poisson's ratio
70	23	28.3	195	10.8	0.31
200	93	27.9	192	10.7	0.31
400	204	26.9	185	10.2	0.31
600	316	26.0	179	9.9	0.32
800	427	25.1	173	9.5	0.32
1000	538	24.2	167	9.1	0.33
1200	649	23.1	159	8.6	0.34
1300	704	22.5	155	8.4	0.34

Unit converter, ksi to MPa

ksi = MPa

Mechanical properties of Alloy 945

Alloy 945 is supplied in three strength conditions. Note that specifying a higher strength condition reduces the hardness margin available for NACE MR0175 compliance.

Limiting properties, annealed and aged

Table 6. Minimum specified properties in the annealed and aged condition
Property	Alloy 945 (HA 119)	Alloy 945X (HA 123)	Alloy 925 (HA 46)
Yield strength, min	125 ksi / 862 MPa	140 ksi / 965 MPa	110 ksi / 759 MPa
Tensile strength, min	150 ksi / 1034 MPa	165 ksi / 1138 MPa	140 ksi / 965 MPa
Elongation, min	18%	18%	18%
Reduction of area, min	25%	25%	25%
Impact energy, min	40 ft-lb	40 ft-lb	35 ft-lb
Hardness range	32 to 42 HRC	32 to 42 HRC	26 to 38 HRC

Typical properties by bar diameter

Production values are above the specified minimums and are retained in large sections. A 14 inch bar recorded 140.3 ksi yield strength and 77 ft-lb impact energy at -75 F.

Table 7. Typical properties of annealed and aged round bar, impact tested at -75 F
Dia. in	Dia. mm	YS ksi	UTS ksi	Elong. %	RA %	Impact ft-lb	HRC	ASTM grain
1.0	25	133.4	173.2	27.8	48.0	76	40	2
2.0	51	132.5	170.2	28.2	47.6	70	40	3
3.5	89	135.5	172.0	25.5	40.5	58.2	43	2
4.5	114	134.2	168.6	28.6	46.7	62	42	2.5
6.0	152	141.0	176.0	22.0	34.6	55.3	42	2.5
12.0	305	142.3	171.7	26.3	43.6	61.2	40	2
14.0	356	140.3	169.3	26.6	30.7	77	39	2

Property uniformity in 6 inch bar

Table 8. Tensile properties by orientation and location, 152 mm bar
Orientation and location	YS ksi	UTS ksi	Elong. %	RA %
Longitudinal, mid-radius	139.9	174.2	22.9	35.3
Longitudinal, centre	138.6	170.4	24.5	31.7
Longitudinal, edge	139.0	173.9	24.2	33.8
Transverse, centre	141.6	175.3	22.5	30.6
Transverse, mid-radius	139.9	175.5	24.3	35.1

The difference between centre and edge values is under 3 ksi, and transverse values match longitudinal values. This indicates uniform precipitate distribution through the section.

Shaft grade, cold worked and direct aged

Table 9. Minimum properties of cold drawn and aged shaft bar
Property	Alloy 945 (HA 121)	Alloy 945X (HA 122)
Yield strength, min	165 ksi / 1138 MPa	210 ksi / 1448 MPa
Tensile strength, min	180 ksi / 1241 MPa	220 ksi / 1517 MPa
Elongation, min	15%	12%
Reduction of area, min	20%	18%
Hardness	38 to 46 HRC	40 to 48 HRC

Shaft grade hardness exceeds the 42 HRC limit that NACE MR0175 applies to Alloy 945 in sour service. It is specified for pump and drive shafting outside the wetted sour environment.

Corrosion resistance and NACE qualification

The following test data supports the use of Alloy 945 in sour service and is the basis for its NACE MR0175 approval.

NACE MR0175 / ISO 15156-3 C-ring qualification

Table 10. C-ring tests to NACE TM0177 Method C, stressed to 100 percent of actual yield
Level	H2S	CO2	Chloride	Temperature	Result
NACE Level VII	3500 kPa (508 psia)	3500 kPa	25 wt% NaCl, 150,000 mg/L Cl	205 C / 401 F	No failure, 90 days
NACE Level VI-450 F	3500 kPa (508 psia)	3500 kPa	20 wt% NaCl, 120,000 mg/L Cl	232 C / 450 F	No failure, 90 days

Nine specimens from three commercial heats were tested at each level. All passed visual examination at 20x magnification.

SSC and GHSC tensile testing

Testing to NACE TM0177-2004 Method A was carried out in NACE Solution A, which is 5 percent NaCl plus 0.5 percent glacial acetic acid, under 100 kPa H2S at 24 C. Specimens stressed to 90 percent of actual yield strength, between 120.8 and 126.9 ksi depending on heat, recorded no failures after 30 days for both sulfide stress cracking and galvanically induced hydrogen stress cracking. GHSC specimens were coupled to steel through the stressing bolt.

Chloride stress corrosion cracking

Table 11. Stress corrosion cracking comparison using U-bend specimens
Alloy	Boiling 25% NaCl at pH 1.5, ASTM G123	Boiling 45% MgCl2 at 155 C, ASTM G36
Alloy 945	No cracks after 720 hours	Cracks at 22 hours, failure at 142 hours
Alloy 925	No cracks after 720 hours	Cracks at 22 hours, failure at 70 hours
304 stainless steel	Cracks after 22 hours	Cracks at 4 hours, failure at 13 hours

The boiling magnesium chloride test to ASTM G36 is an accelerated screening test and results are used on a comparative basis. Time to failure for Alloy 945 was twice that of Alloy 925 and about eleven times that of 304 stainless steel.

Localised corrosion

Table 12. Critical pitting temperature to ASTM G48 in acidified ferric chloride
Alloy	CPT, C
Alloy 945	50
Alloy 925	35

Slow strain rate testing

Slow strain rate testing was carried out in 25 wt% NaCl plus 0.5 wt% acetic acid under 100 psig H2S at a strain rate of 4.0 x 10^-6 per second. Environment to air ratios were 0.88 to 0.94 at 121 C and at 149 C. No secondary cracking was observed.

Heat treatment of Alloy 945

Heat treatment determines the final properties of Alloy 945 forgings. The double aging cycle is required. A single step age will not produce the precipitate distribution assumed by the specification.

STEP 1

Solution anneal

1010 to 1066 C
1850 to 1950 F
0.5 to 4 hours

STEP 2

Water quench

To room temperature,
holds solutes in solution

STEP 3

First age

704 to 732 C
1300 to 1350 F
6 to 8 hours

STEP 4

Furnace cool

26 to 56 C per hour
down to 607 to 635 C

STEP 5

Second age

607 to 635 C
6 to 8 hours, air cool

Process notes

Annealing range. The alloy can be annealed from 954 C, but the range of 1010 to 1066 C gives the best combination of grain size and properties. Annealing below this range can leave retained cold work and produce an inconsistent aging response.

Aging temperature tolerance. Hardness change is negligible across an exposure range of 677 to 760 C. This makes the alloy suitable for large industrial furnaces where temperature uniformity varies across the load.

Hardness check. Final hardness must fall within 32 to 42 HRC. Hardness above 42 HRC is outside the NACE MR0175 acceptance limit for this alloy.

Machining sequence. Rough machine before aging and finish machine after aging. Aged material at 40 HRC and above increases tool wear on heavy cuts.

Forging, working and machining

Hot working and open-die forging

The hot working range of Alloy 945 is 930 to 1150 C (1700 to 2100 F). Its hot working characteristics are similar to those of Alloy 718. Finishing temperature must be controlled, since finishing below the range leaves residual strain that affects the subsequent aging response.

Open-die forging is used for most oil and gas geometries in this alloy because the components are large and order quantities are low. Open-die forging also produces continuous grain flow, which improves fatigue performance in valve bodies and wellhead blocks compared with parts machined from bar stock.

Table 13. Alloy 945 open-die forging forms produced by Jiangyin Jiangnan Metal
Forging form	Size range	Application
Forged round bar	50 to 800 mm diameter, up to 6000 mm long	Valve stems, shafting, fastener stock
Forged ring	Up to 2500 mm outside diameter	Flanges, wellhead connectors, seal rings
Forged disc	Up to 1800 mm diameter	Blind flanges, closures, tube sheets
Forged block	Up to 5000 kg per piece	Valve bodies, Christmas tree blocks, manifolds
Step shaft	Multi-diameter, to drawing	Pump shafts, drive shafts
Near-net-shape blank	To customer drawing	Components with reduced machining allowance

Cold working

Alloy 945 can be cold worked up to 40 percent reduction. Its work hardening rate is similar to that of Monel K-500 and lower than that of 304 stainless steel. Cold drawing followed by direct aging produces the shaft grade properties given in Table 9.

Machinability

Machinability is good in both the solution annealed and the aged condition. Rigid tooling with positive rake angles should be used, and techniques that minimise work hardening of the material should be applied. Best results are obtained by rough machining before age hardening and finishing after final heat treatment.

Welding

Alloy 945 is welded by gas tungsten arc welding and pulsed gas metal arc welding using matching filler metal 945 or filler metal 725NDUR. For pulsed GMAW, current should not exceed 185 amperes in spray arc transfer on standard power sources. Submerged arc welding and shielded metal arc welding are not recommended. Material is re-annealed and re-aged after welding.

Table 14. Cross-weld tensile properties, GTAW, average of two tests
Filler and test temperature	YS ksi	UTS ksi	Elong. %	RA %	Failure location
Filler 945, room temperature	139	176	25.3	42.8	Base metal
Filler 945, 350 F / 177 C	130	163	21.7	40.9	Base metal
Filler 725NDUR, room temperature	129	164	23	35	Weld metal

Weldments made with matching filler metal 945 failed in the base metal rather than in the weld. Filler metal 725NDUR is acceptable but gives lower cross-weld strength.

Applications of Alloy 945

Alloy 945 is specified where high mechanical loading and severe sour service chemistry occur together.

Downhole and surface well equipment

Tubular products, valve bodies and gates, wellhead Christmas trees, casing and tubing hangers, landing nipples, tool joints, packers and subsurface safety valves. Christmas tree blocks are commonly forged and machined from this alloy.

Rotating equipment

Pump shafting and impeller shafts in severe service pumps, using the cold worked and direct aged shaft grade for its higher yield strength and rotating beam fatigue strength.

Fasteners and piping

High strength bolting, studs and nuts for flanged joints exposed to hydrogen sulfide, and high strength piping systems in sour gathering and processing service.

Applicable standards

Table 15. Standards applicable to Alloy 945 forgings
Standard	Scope
UNS N09945	Unified Numbering System designation
NACE MR0175 / ISO 15156-3	Materials for H2S-containing oil and gas environments, Level VII and Level VI-450 F
ASTM B637	Precipitation-hardening nickel alloy bars, forgings and forging stock
API 6A	Wellhead and Christmas tree equipment
API 6A718 Annex H	Nickel alloy material requirements for API equipment
NACE TM0177	Laboratory test methods for sulfide stress cracking resistance
ASTM G36, G48, G123	Pitting and stress corrosion cracking test methods
EN 10204	Inspection documents, types 3.1 and 3.2

Alloy 945 compared with Alloy 925, 718 and 725

These four alloys overlap in oil and gas material specifications. The table below summarises the main selection data.

Table 16. Comparison of sour service nickel alloys
Criterion	Alloy 945	Alloy 925	Alloy 718	Alloy 725
UNS number	N09945	N09925	N07718	N07725
Minimum yield strength	125 ksi	110 ksi	120 ksi	120 ksi
Minimum tensile strength	150 ksi	140 ksi	150 ksi	150 ksi
Nickel content	45 to 55%	42 to 46%	50 to 55%	55 to 59%
Molybdenum content	3 to 4%	2.5 to 3.5%	2.8 to 3.3%	7.0 to 9.5%
CPT to ASTM G48	50 C	35 C	about 15 C	about 65 C
Relative alloy cost	Moderate	Low	Moderate	High
Typical selection	High strength with severe sour service	Milder sour service	High strength with limited chloride pitting exposure	Most aggressive halide chemistry

Alloy 945 provides higher strength and a higher critical pitting temperature than Alloy 925. It matches the strength of Alloy 718 with better localised corrosion resistance. Alloy 725, with 7 to 9.5 percent molybdenum, provides higher pitting resistance at higher alloy cost and is specified where produced fluid chemistry requires it.

Frequently asked questions

What is Alloy 945 (UNS N09945)?

Alloy 945 (UNS N09945), also supplied as Incoloy alloy 945, is an age-hardenable nickel-iron-chromium alloy containing 45 to 55 percent nickel, 19.5 to 23 percent chromium, 3 to 4 percent molybdenum, 2.5 to 4.5 percent niobium, 1.5 to 3 percent copper and 0.5 to 2.5 percent titanium, with iron as balance. It has a minimum yield strength of 125 ksi (862 MPa) and is approved under NACE MR0175 / ISO 15156-3 to Level VII for sour oil and gas service. Jiangyin Jiangnan Metal Co., Ltd. manufactures Alloy 945 open-die forgings in Jiangyin, Jiangsu Province, China.

What is the density of Alloy 945?

8.2 g/cm³, equal to 0.296 lb/in³, at room temperature.

What is the melting point of Alloy 945?

The melting range is 1270 to 1377 C (2317 to 2510 F). As a multi-element alloy it melts over a range rather than at a single temperature.

What is the yield strength of Alloy 945?

In the annealed and aged condition, 125 ksi (862 MPa) minimum yield and 150 ksi (1034 MPa) minimum tensile. Alloy 945X has 140 ksi (965 MPa) minimum yield. Cold worked and direct aged shaft grade has 165 ksi (1138 MPa) minimum, and shaft grade 945X has 210 ksi (1448 MPa). Typical production bar records 132 to 142 ksi yield.

What is the difference between Alloy 945 and Alloy 945X?

Both grades share the UNS N09945 composition. Alloy 945 is specified to 125 ksi minimum yield under HA 119 and Alloy 945X to 140 ksi under HA 123. Both carry the same 32 to 42 HRC hardness range and the same NACE Level VII and Level VI-450 F approval.

Can Alloy 945 be open-die forged?

Yes. The hot working range is 930 to 1150 C (1700 to 2100 F), with hot working characteristics similar to Alloy 718, and the alloy accepts up to 40 percent cold reduction. Jiangyin Jiangnan Metal Co., Ltd. produces Alloy 945 forged bars, rings, discs, blocks and step shafts up to 5,000 kg per piece, with solution annealing and double aging, ultrasonic testing and EN 10204 3.1 or 3.2 certification. Contact sales@steelforgepieces.com or +86-189-2135-9659.

What heat treatment does Alloy 945 require?

Solution anneal at 1010 to 1066 C (1850 to 1950 F) for 0.5 to 4 hours, then water quench. Double age at 704 to 732 C (1300 to 1350 F) for 6 to 8 hours, furnace cool at 26 to 56 C per hour to 607 to 635 C (1125 to 1175 F), hold 6 to 8 hours, then air cool. This forms the gamma prime Ni3(TiNbAl) and gamma double prime Ni3(NbTiAl) precipitates. Final hardness must fall within 32 to 42 HRC for NACE compliance.

Is Alloy 945 resistant to sulfide stress cracking?

Yes. Under NACE TM0177-2004 Method A in NACE Solution A at 90 percent of actual yield strength, no failures were recorded after 30 days for either sulfide stress cracking or galvanically induced hydrogen stress cracking. C-ring testing at 100 percent of yield stress under NACE Level VII conditions of 3500 kPa H2S, 3500 kPa CO2 and 25 percent NaCl at 205 C recorded no failures after 90 days across nine specimens from three heats.

How does Alloy 945 compare with Alloy 925?

Alloy 945 has 125 ksi minimum yield against 110 ksi for Alloy 925, a critical pitting temperature of 50 C against 35 C to ASTM G48, NACE Level VII approval against Level V, and 142 hours to failure against 70 hours in the boiling magnesium chloride test to ASTM G36. Alloy 925 remains in use for milder sour environments where 110 ksi yield is sufficient.

Can Alloy 945 be welded?

Yes, by gas tungsten arc welding and pulsed gas metal arc welding using matching filler metal 945 or filler metal 725NDUR. Pulsed GMAW current should not exceed 185 amperes in spray arc transfer. Submerged arc welding and shielded metal arc welding are not recommended. Cross-weld specimens made with matching filler metal 945 failed in the base metal rather than in the weld.

What are the typical applications of Alloy 945?

Downhole and surface sour gas well equipment, including tubular products, valve bodies and gates, wellhead Christmas trees, hangers, landing nipples, tool joints, packers and subsurface safety valves. It is also used for pump and drive shafting, high strength fasteners and high strength piping systems.

Who supplies Alloy 945 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, supplies custom Alloy 945 (UNS N09945) forgings worldwide, including bars, rings, discs, blocks, step shafts and near-net-shape blanks. Enquiries: sales@steelforgepieces.com, telephone +86-189-2135-9659.

Alloy 945 forgings from Jiangyin Jiangnan Metal

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin City, Jiangsu Province, China. We produce nickel alloy, stainless steel, duplex and alloy steel forgings for oil and gas, petrochemical, power generation, marine and mining customers.

Process control on Alloy 945 orders

Forging. Billet heating and finishing temperatures are held within the 930 to 1150 C range. Forging ratio and the upset and draw sequence are planned for each geometry to develop continuous grain flow and to break down the as-cast structure through the full section.

Heat treatment. Solution annealing and double aging are carried out in furnaces with documented temperature uniformity surveys. Soak times are set from actual section thickness. Hardness is verified against the 32 to 42 HRC range on each heat treatment lot.

Testing. Chemical analysis by spectrometer, tensile and impact testing at the specified orientations and locations, hardness survey, ultrasonic examination to ASTM A388 or the applicable API acceptance class, and magnetic particle or liquid penetrant examination as required by the order.

Documentation. EN 10204 Type 3.1 or 3.2 certificates, heat number traceability from melt through final machining, and third party inspection by SGS, BV, Lloyd's Register or TUV when specified.

Information required for a quotation

Drawing or dimensions with machining allowance, applicable specification such as ASTM B637, API 6A or NACE MR0175, strength grade required (125 ksi standard or 140 ksi 945X), quantity, testing and NDT requirements, certification type and delivery destination. Quotations are normally issued within one working day.

Jiangyin Jiangnan Metal Co., Ltd., Open-Die Forging Factory
No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Tel +86-189-2135-9659 | Email sales@steelforgepieces.com

Data sources

Property data on this page is taken from published industry standards and from the alloy producer's technical literature. Values are typical or specified minima given for reference and do not constitute a warranty for any specific application. Requirements should be confirmed against the governing purchase specification.

Special Metals Corporation, INCOLOY alloys 945 and 945X technical bulletin, specifications HA 119, HA 121, HA 122 and HA 123.
NACE MR0175 / ISO 15156-3, Petroleum and natural gas industries, materials for use in H2S-containing environments in oil and gas production, Part 3, cracking-resistant CRAs and other alloys.
NACE TM0177-2004, laboratory testing of metals for resistance to sulfide stress cracking and stress corrosion cracking in H2S environments, Methods A and C.
ASTM B637, standard specification for precipitation-hardening and cold worked nickel alloy bars, forgings and forging stock for moderate or high temperature service.
ASTM G36, G48 and G123, stress corrosion cracking and pitting corrosion test methods.
API 6A and API 6A718 Annex H, wellhead and Christmas tree equipment material requirements.

Page last reviewed 14 August 2026 by the Technical Department, Jiangyin Jiangnan Metal Co., Ltd. Incoloy is a registered trademark of Special Metals Corporation and is used here for material identification only.

UNS number	N09945
Alloy family	Ni-Fe-Cr
Density	8.2 g/cm³
Melting range	1270-1377 C
Yield, min	125 ksi
Tensile, min	150 ksi
Elongation, min	18%
Hardness	32-42 HRC
Young's modulus	200.8 GPa
CPT, ASTM G48	50 C
NACE level	VII
Hot work range	930-1150 C