NiMo16Cr15W is the EN and DIN name for a low-carbon nickel-molybdenum-chromium-tungsten corrosion-resistant alloy, material number 2.4819, UNS N10276. It carries about 15 to 17 per cent molybdenum, 14.5 to 16.5 per cent chromium, 3 to 4.5 per cent tungsten and 4 to 7 per cent iron, with nickel as the balance and carbon held to 0.010 per cent maximum. It is a solid-solution alloy used where both oxidising and reducing media occur, and it is one of the few materials that stands up to wet chlorine gas, hypochlorite and chlorine dioxide.

Can NiMo16Cr15W be hardened by heat treatment or age hardening?

No. NiMo16Cr15W is a solid-solution alloy and cannot be strengthened by precipitation hardening or ageing. Holding it in the range of roughly 650 to 1050 degrees Celsius precipitates mu phase and M6C carbides at the grain boundaries, which cuts ductility and corrosion resistance. The only correct final heat treatment is solution annealing at about 1120 to 1160 degrees Celsius followed by a rapid water quench. Strength can be raised only by cold work, which is rarely appropriate for corrosion-service forgings. Stress-relief treatments are not effective, so a full solution anneal is used instead.

Is NiMo16Cr15W suitable for sour service under NACE MR0175?

Yes. UNS N10276 is listed in NACE MR0175 and ISO 15156-3 for sour service in the solution-annealed condition, normally limited to 22 HRC maximum hardness. Cold-worked material carries separate and tighter limits. Check the temperature, hydrogen sulphide partial pressure and chloride limits for your service environment against the current edition of the standard before ordering.

What forged shapes and sizes can be supplied in NiMo16Cr15W?

Jiangyin Jiangnan Metal Co., Ltd. supplies NiMo16Cr15W as seamless rolled rings, forged discs and blanks, shafts and spindles, flanges, sleeves and bushings, hollow bar, tube sheets, valve bodies and stems, nozzles and forged pipe sections. Typical open-die range is 5 to 8000 kg finished weight, ring outside diameter 120 to 3000 mm and bar diameter 20 to 800 mm. Parts are forged to customer drawing and supplied as forged, rough machined or finish machined.

What testing and certification is supplied with NiMo16Cr15W forgings?

Standard supply covers chemical analysis of the heat, room-temperature tensile testing on a representative test piece, hardness testing and dimensional inspection, reported on an EN 10204 3.1 inspection certificate. Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, liquid penetrant testing to ASTM E165, positive material identification, intergranular corrosion testing to ASTM G28 method A and third-party EN 10204 3.2 certification are available on request and should be stated at enquiry stage.

How do I request a quotation for NiMo16Cr15W forgings?

Send a drawing or the finished dimensions together with the quantity, the governing standard, the required certification level, any ultrasonic or corrosion test requirement and the machining condition wanted, to sales@steelforgepieces.com or by telephone to +86 189 2135 9659. Quotations normally go back within one working day. Production lead time for NiMo16Cr15W forgings runs 25 to 40 days depending on section size and machining scope.

NiMo16Cr15W (2.4819 / UNS N10276) Open-Die Forgings

Q: What is the chemical composition of NiMo16Cr15W (2.4819)?

Per DIN 17744: carbon 0.010 per cent max, silicon 0.08 max, manganese 1.00 max, phosphorus 0.025 max, sulphur 0.010 max, chromium 14.50 to 16.50, molybdenum 15.00 to 17.00, tungsten 3.00 to 4.50, iron 4.00 to 7.00, cobalt 2.50 max, vanadium 0.35 max, nickel balance at roughly 51 to 63 per cent. The tungsten range is often mis-typed as copper on older datasheets. Copper is not a specified element in this grade.

Q: What are the correct forging and annealing temperatures for NiMo16Cr15W?

Hot working starts at about 1230 degrees Celsius and must finish above about 950 degrees Celsius. The working window is narrower than for austenitic stainless steel, so moderate reductions with frequent reheating give the best result. After all hot work the forging is solution annealed at about 1120 to 1160 degrees Celsius, held 10 to 30 minutes according to section thickness, then water quenched fast through the precipitation range.

Q: Which standards cover NiMo16Cr15W forgings?

Composition is defined in DIN 17744. Bar is covered by DIN 17752 and ASTM B574. Forgings are covered by ASTM B564 and ASME SB-564. Forged or rolled flanges and fittings are covered by ASTM B462. European pressure equipment approval runs through VdTUV Werkstoffblatt 400. Sour service is covered by NACE MR0175 with ISO 15156 and NACE MR0103 with ISO 17945. Ultrasonic acceptance is normally specified to EN 10228-3, SEP 1921 or ASTM A388.

Q: NiMo16Cr15W or Alloy C-22: which should I specify?

Use NiMo16Cr15W, that is C-276, where the service is mainly reducing or mixed: hydrochloric acid, sulphuric acid, wet chlorine, hypochlorite, seawater and sour gas. Use Alloy C-22, UNS N06022 and W.Nr. 2.4602, where the service is strongly oxidising, such as hot nitric acid, oxidising chloride solutions and flue-gas desulphurisation, because its 20 to 22.5 per cent chromium performs better there. C-22 also holds up better in the weld heat-affected zone. Both are forged and annealed the same way.

Q: Who supplies NiMo16Cr15W open-die forgings in China?

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, producing NiMo16Cr15W, that is 2.4819 and UNS N10276, forgings to drawing for export. Telephone +86 189 2135 9659 or email sales@steelforgepieces.com. Send the drawing or finished dimensions, quantity, applicable standard and certification level for a quotation.

Key facts

Everything below applies to NiMo16Cr15W, that is 2.4819 and UNS N10276, supplied in the solution-annealed and water-quenched condition.

Alloy familyLow-carbon Ni-Mo-Cr-W solid-solution corrosion-resistant alloy
Nominal chemistryNi bal. · Mo 16% · Cr 15.5% · W 3.75% · Fe 5.5% · C ≤0.010%
Tensile / proof / elong.≥690 MPa · ≥283 MPa · ≥40%
Density8.89 g/cm³
PREN, W-correctedAbout 74, among the highest of any wrought alloy
Hot forging window1230 °C start, 950 °C finish. Narrow.
Final heat treatmentSolution anneal 1120 to 1160 °C, rapid water quench. Never aged.
Forged weight range5 to 8,000 kg finished
CertificationEN 10204 3.1 standard, 3.2 third-party on request
Made byJiangyin Jiangnan Metal Co., Ltd., Jiangyin, Jiangsu, China

Designations and cross-reference

Buyers meet this alloy under at least six names, and that causes ordering errors. NiMo16Cr15W, 2.4819, UNS N10276 and Alloy C-276 all describe the same chemistry. Hastelloy is a registered trade mark of Haynes International. On a purchase order, give the standard and the grade number rather than the trade name, so that any qualified mill can supply.

Table 2.1 Equivalent designations for NiMo16Cr15W
System	Designation	Notes
EN / DIN	NiMo16Cr15W	Composition per DIN 17744
Werkstoff-Nr.	2.4819	German material number
UNS	N10276	Used by ASTM and ASME
ISO	NiMo16Cr15Fe6W4	Full ISO name
AFNOR	NC17D	French designation
AWS filler	ERNiCrMo-4 / ENiCrMo-4	Matching wire and electrode
Trade names	C-276	Hastelloy® C-276, Nicrofer® 5716 hMoW, VDM® Alloy C-276, Inconel® C-276

Governing standards for forged product

Table 2.2 Standards applicable to NiMo16Cr15W forgings and bar
Standard	Scope
DIN 17744	Chemical composition, wrought nickel alloys
DIN 17752	Rod and bar
ASTM B564 / ASME SB-564	Nickel alloy forgings
ASTM B574 / ASME SB-574	Low-carbon Ni-Cr-Mo alloy rod
ASTM B462	Forged or rolled flanges, fittings, valves and parts
VdTÜV WB 400	European pressure-equipment approval
NACE MR0175 / ISO 15156-3	Sour service, oil and gas
NACE MR0103 / ISO 17945	Sour service, refinery
EN 10228-3 / SEP 1921 / ASTM A388	Ultrasonic examination of forgings
EN 10204	Types of inspection document, 3.1 and 3.2

Chemical composition

Composition limits for NiMo16Cr15W follow DIN 17744. The ASTM B574 limits for UNS N10276 are shown alongside where they differ. Nickel is the balance, normally 51 to 63 per cent.

Table 3.1 NiMo16Cr15W / UNS N10276 composition, weight per cent
Element	Min	Max	Role in the alloy
Ni	bal.		Matrix, about 51 to 63%
Mo	15.00	17.00	Resistance to reducing acids, pitting and crevice attack
Cr	14.50	16.50	Passive film, resistance to oxidising media
W	3.00	4.50	Reinforces localised-corrosion resistance
Fe	4.00	7.00	Controlled residual from melt stock
Co		2.50	Residual, restricted for nuclear service
Mn		1.00	Deoxidiser
V		0.35	Residual
Si		0.08	Held low to limit intermetallic phases
C		0.010	Held low to prevent carbide precipitation in the weld HAZ
P		0.025	DIN 17744. ASTM B574 allows 0.040 max
S		0.010	DIN 17744. ASTM B574 allows 0.030 max

Watch the tungsten row. A copying error carried by a number of older datasheets puts “Cu 3–4.5” where tungsten belongs. Copper is not a specified element in NiMo16Cr15W. The W in the designation is tungsten, at 3.00 to 4.50 per cent. If a mill certificate reports copper in that range, query it before you accept the material.

Melting route

Our NiMo16Cr15W stock is melted by EAF with AOD or VOD refining. Electroslag remelting is added where the enquiry calls for better cleanliness, less segregation and a tighter ultrasonic acceptance class on heavy sections.

Mechanical and physical properties

Values below are for NiMo16Cr15W in the solution-annealed condition. The tensile figures are specification minima to ASTM B564 and B574. Forged results normally run well above them and are reported on the certificate issued for each heat.

Table 4.1 Room-temperature mechanical minima, solution annealed
Property	Metric	Imperial
Tensile strength, R_m	≥ 690 MPa	≥ 100 ksi
Proof strength, R_p0.2	≥ 283 MPa	≥ 41 ksi
Elongation, A	≥ 40 %	≥ 40 %
Hardness	≤ 100 HRB	≤ 22 HRC for NACE

Table 4.2 Physical properties at 20 °C unless stated
Property	Value
Density	8.89 g/cm³ (0.321 lb/in³)
Melting range	1325 to 1370 °C (2415 to 2500 °F)
Modulus of elasticity	205 GPa (29.8 × 10³ ksi)
Thermal conductivity	10.2 W/m·K
Specific heat	427 J/kg·K
Mean expansion, 20 to 100 °C	11.2 µm/m·K
Electrical resistivity	1.30 µΩ·m
Magnetic response	Non-magnetic, µ_r about 1.0002

Forging practice and heat treatment

NiMo16Cr15W is more sensitive to strain and strain rate than austenitic stainless steel and its hot-working window is narrow. Forging discipline therefore decides whether the finished part keeps its corrosion resistance.

Table 5.1 Thermal processing of NiMo16Cr15W forgings
Operation	Parameter
Hot forging, start	About 1230 °C (2250 °F)
Hot forging, finish	≥ 950 °C (1750 °F)
Reduction practice	Moderate reductions, frequent reheating
Solution anneal	1120 to 1160 °C, hold 10 to 30 min by section
Quench	Rapid water quench. Air cooling only below about 10 mm section
Ageing	Not applicable. The alloy is not age hardenable
Stress relief	Not effective. A full solution anneal is used instead

Do not age or slow cool. Between roughly 650 and 1050 °C this alloy precipitates mu phase and M₆C carbides at the grain boundaries. That costs ductility and, more to the point, opens the material to intergranular attack. A specification calling for solution treatment plus ageing on 2.4819 is in error. Every forging is re-annealed after the last hot-work operation and quenched fast through this range.

Machining and welding

The alloy work hardens readily. Machine with rigid set-ups, positive rake carbide tooling and a heavy constant feed, and do not let the tool dwell. Welding is by GTAW, GMAW or SMAW with matching ERNiCrMo-4 and ENiCrMo-4 consumables at low heat input. Because the carbon content is low, the weld heat-affected zone normally stays free of grain-boundary carbides, so many assemblies go into service as welded.

Forged product forms and size range

Every item below is produced in NiMo16Cr15W to customer drawing, as forged, rough machined or finish machined.

Seamless rolled rings, radial-axial rolled, for vessel and pump work
Forged discs and blanks, including tube sheets and blind blanks
Shafts and spindles, pump shafts, agitator shafts, eccentric shafts
Flanges, weld-neck, slip-on, blind and special profiles per ASTM B462
Sleeves, bushings and hollow bar, bored and trepanned
Valve components, bodies, bonnets, seat rings, stems, plugs, gates
Round bar, square and rectangular blocks
Nozzles, forged pipe sections and reducers

Table 6.1 Typical open-die capability in NiMo16Cr15W
Form	Range
Finished piece weight	5 to 8,000 kg
Rolled ring, outside diameter	120 to 3,000 mm
Ring wall / height	Up to 600 mm / up to 800 mm
Round bar diameter	20 to 800 mm
Shaft length	Up to 6,000 mm
Disc and tube sheet diameter	Up to 2,500 mm
Minimum order	One piece. Prototypes and single spares accepted

Testing, inspection and certification

Supplied as standard with each NiMo16Cr15W order: heat chemical analysis, room-temperature tensile test on a representative test piece, hardness survey and full dimensional report, issued on an EN 10204 3.1 inspection certificate.

Available on request, and best specified at enquiry stage:

Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, with the acceptance class stated
Liquid penetrant testing to ASTM E165 or EN 10228-2
Intergranular corrosion test to ASTM G28 method A
Positive material identification on every piece
Impact testing at ambient or sub-zero temperature
Grain size and micrographic examination
NACE MR0175 / ISO 15156-3 hardness verification for sour service
EN 10204 3.2 certification witnessed by TÜV, SGS, BV, Lloyd’s or the client’s own inspector

Where NiMo16Cr15W forgings are used

The alloy earns its cost where a plant cannot say in advance whether the medium will be reducing or oxidising, or where chlorides are present at temperature. Typical service:

Table 8.1 Applications by industry
Industry	Forged parts	Why this alloy
Chemical process	Reactor rings, agitator shafts, nozzles, tube sheets, flanges	Sulphuric, hydrochloric, phosphoric, formic and acetic acids, acetic anhydride
Chlorine and chlor-alkali	Valve bodies, seat rings, sleeves, pump shafts	Wet chlorine gas, hypochlorite and chlorine dioxide, where few alloys survive
Oil and gas, subsea	Wellhead blocks, Christmas-tree components, hubs, stems	Sour service to NACE MR0175 and ISO 15156-3, chloride SCC resistance
Flue-gas desulphurisation	Rolled rings, ducting flanges, fan shafts	Hot acidic condensate carrying chlorides and fluorides
Pulp, paper and bleaching	Rolls, discs, bushings, digester components	Chlorine dioxide bleach plant environments
Pharmaceutical and fine chemicals	Crystalliser parts, sanitary flanges, agitator hubs	Mixed acid duty with no product contamination
Marine and desalination	Pump casing blanks, shafts, sleeves	Seawater and brine, high crevice-corrosion resistance
Waste incineration and scrubbers	Rings, tube sheets, support plates	Halide-bearing hot gas and condensate

NiMo16Cr15W compared with the alternatives

Specifying C-276 out of habit is common, and sometimes expensive. The table sets out how the nickel corrosion-resistant grades divide up.

Table 9.1 Selection guide for nickel corrosion-resistant alloys
Alloy	UNS / W.Nr.	Cr	Mo	W	PREN	Best suited to
NiMo16Cr15W (C-276)	N10276 / 2.4819	15.5	16	3.75	~74	Mixed and reducing media, wet chlorine, hypochlorite, seawater, sour service
Alloy C-22	N06022 / 2.4602	21	13.5	3	~70	Strongly oxidising duty, hot nitric, FGD. Better weld HAZ stability
Alloy C-4	N06455 / 2.4610	16	15.5		~67	Long exposure at 650 to 1040 °C where sensitisation is the risk
Alloy 625	N06625 / 2.4856	21.5	9		~51	Higher strength, seawater, elevated temperature. Lower cost
Alloy B-2 and B-3	N10665 / 2.4617		28		n/a	Pure reducing duty, hydrochloric acid. Fails in oxidising media

PREN is the tungsten-corrected pitting resistance equivalent number, Cr + 3.3(Mo + 0.5W). It ranks resistance to pitting and crevice attack in chloride service. It says nothing about behaviour in oxidising acids, where chromium content decides the outcome.

Requesting a quotation

Send a drawing or the finished dimensions and we will quote against them. Quotations normally go back within one working day. Production lead time for NiMo16Cr15W forgings runs 25 to 40 days, depending on section size and machining scope.

To get a firm price rather than an estimate, include:

Drawing, or finished dimensions plus the machining allowance you want left on
Quantity, and whether this is a one-off spare or a repeat order
Governing standard: ASTM B564, ASTM B462, DIN 17752 or your own specification
Certification level: EN 10204 3.1, or 3.2 with the inspection body named
NDT requirement: UT standard and acceptance class, PT, PMI, ASTM G28
Sour-service requirement, if any, with the applicable NACE edition
Delivery condition: as forged, rough machined, or finish machined
Destination port and required delivery date

Email sales@steelforgepieces.com or call +86 189 2135 9659.

Frequently asked questions

What is NiMo16Cr15W?

NiMo16Cr15W is the EN and DIN name for a low-carbon nickel-molybdenum-chromium-tungsten corrosion-resistant alloy, material number 2.4819, UNS N10276. It carries about 15 to 17 per cent molybdenum, 14.5 to 16.5 per cent chromium, 3 to 4.5 per cent tungsten and 4 to 7 per cent iron, nickel balance, with carbon held to 0.010 per cent maximum. It is a solid-solution alloy used where both oxidising and reducing media occur, and it is one of the few materials that stands up to wet chlorine gas, hypochlorite and chlorine dioxide.

Is NiMo16Cr15W the same as Hastelloy C-276?

Yes, the same alloy under different naming systems. NiMo16Cr15W is the European designation, W.Nr. 2.4819. UNS N10276 is the North American number. Hastelloy® C-276 is Haynes International’s trade name. Other mill names for the identical chemistry include Alloy C-276, Nicrofer® 5716 hMoW and VDM® Alloy C-276. On a purchase order, give the standard and grade number rather than the trade name.

What is the chemical composition of NiMo16Cr15W (2.4819)?

Per DIN 17744: C 0.010 max, Si 0.08 max, Mn 1.00 max, P 0.025 max, S 0.010 max, Cr 14.50 to 16.50, Mo 15.00 to 17.00, W 3.00 to 4.50, Fe 4.00 to 7.00, Co 2.50 max, V 0.35 max, Ni balance at roughly 51 to 63 per cent. The tungsten range is often mis-typed as copper on older datasheets. Copper is not a specified element in this grade. Full table in clause 3.

Can NiMo16Cr15W be age hardened?

No. It is a solid-solution alloy and cannot be strengthened by precipitation hardening. Holding it around 650 to 1050 °C precipitates mu phase and M₆C carbides at the grain boundaries, cutting ductility and corrosion resistance. The only correct final treatment is solution annealing at about 1120 to 1160 °C followed by a rapid water quench. Strength can be raised only by cold work, which is rarely appropriate for corrosion-service forgings. Stress-relief treatments are not effective, so a full solution anneal is used instead.

What are the correct forging and annealing temperatures?

Hot working starts at about 1230 °C and must finish above about 950 °C. The window is narrower than for austenitic stainless steel, so moderate reductions with frequent reheating give the best result. After all hot work the forging is solution annealed at about 1120 to 1160 °C, held 10 to 30 minutes by section thickness, and water quenched fast through the precipitation range.

Which standards cover NiMo16Cr15W forgings?

Composition: DIN 17744. Bar: DIN 17752 and ASTM B574. Forgings: ASTM B564 and ASME SB-564. Forged or rolled flanges and fittings: ASTM B462. European pressure equipment: VdTÜV WB 400. Sour service: NACE MR0175 with ISO 15156-3, and NACE MR0103 with ISO 17945. Ultrasonic acceptance is normally specified to EN 10228-3, SEP 1921 or ASTM A388.

NiMo16Cr15W or Alloy C-22, which should I specify?

Use NiMo16Cr15W, that is C-276, for predominantly reducing or mixed service: hydrochloric and sulphuric acid, wet chlorine, hypochlorite, seawater, sour gas. Use Alloy C-22, UNS N06022 and W.Nr. 2.4602, for strongly oxidising service such as hot nitric acid, oxidising chloride solutions and flue-gas desulphurisation, where its 20 to 22.5 per cent chromium performs better and the weld heat-affected zone holds up better. Both forge and anneal the same way. See clause 9.

Is NiMo16Cr15W acceptable for sour service under NACE MR0175?

Yes. UNS N10276 is listed in NACE MR0175 and ISO 15156-3 in the solution-annealed condition, normally limited to 22 HRC maximum. Cold-worked material carries separate, tighter limits. Check the temperature, H₂S partial pressure and chloride limits for your specific environment against the current edition before ordering.

What sizes and shapes can be forged?

Seamless rolled rings, discs and blanks, shafts and spindles, flanges, sleeves and bushings, hollow bar, tube sheets, valve bodies and stems, nozzles and forged pipe sections. Typical range is 5 to 8,000 kg finished weight, ring outside diameter 120 to 3,000 mm and bar diameter 20 to 800 mm. Single pieces are accepted. Details in clause 6.

Who supplies NiMo16Cr15W open-die forgings in China?

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging works at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, producing NiMo16Cr15W, that is 2.4819 and UNS N10276, forgings to drawing for export. Telephone +86 189 2135 9659, email sales@steelforgepieces.com. Send the drawing or dimensions, quantity, standard and certification level for a quotation.

What testing and certification comes with the forgings?

As standard: heat chemical analysis, room-temperature tensile test, hardness and dimensional report on an EN 10204 3.1 certificate. On request: ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, penetrant testing to ASTM E165, ASTM G28 method A intergranular corrosion testing, positive material identification, impact testing, grain size, and EN 10204 3.2 third-party certification witnessed by TÜV, SGS, BV or Lloyd’s.

How long does an order take?

Quotation normally goes back within one working day. Production lead time for NiMo16Cr15W forgings runs 25 to 40 days from drawing approval, depending on section size, machining scope and third-party inspection requirements.

About the manufacturer

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Jiangyin sits on the south bank of the Yangtze in the Wuxi metallurgical belt, about two hours from Shanghai port, which is how our forgings reach buyers in Europe, North America, the Middle East and Southeast Asia.

We forge to drawing in carbon steel, alloy steel, tool steel, stainless steel and nickel-base corrosion-resistant alloys, as seamless rolled rings, shafts, flanges, discs, sleeves, bushings, tube sheets and blanks. Enquiries are answered in English and Chinese.

Table 12.1 Contact and identification
Field	Detail
Company	Jiangyin Jiangnan Metal Co., Ltd.
Type	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
Nearest port	Shanghai and Ningbo
Languages	English, Chinese

Citing this datasheet

Jiangyin Jiangnan Metal Co., Ltd. (2026). NiMo16Cr15W (W.Nr. 2.4819 / UNS N10276) Forgings, Datasheet and Supply. Retrieved from https://www.steelforgepieces.com/Nickel-Alloy/NiMo16Cr15W.html

Property values are typical or specification minima for the solution-annealed condition and are given for guidance in material selection. They are not a guarantee of performance in a specific service environment. Check against the governing standard and the certificate issued for the heat supplied. Hastelloy® is a registered trade mark of Haynes International. Nicrofer® and VDM® are trade marks of VDM Metals. Inconel® is a trade mark of Special Metals Corporation. Trade names are used for identification only. Last reviewed 25 August 2026.

NiMo16Cr15W Forgings, W.Nr. 2.4819 / UNS N10276