# NiCr25FeAlY Forgings (Alloy 602 CA / W.Nr. 2.4633 / UNS N06025)

**Material data sheet / nickel-chromium alloy / open-die forgings**

| | |
|---|---|
| EN designation | NiCr25FeAlY |
| EN material number | 2.4633 |
| UNS | N06025 |
| Trade names | Alloy 602 CA, Nicrofer 6025 HT, Inconel 602 CA, RA 602 CA |
| Forging specification | ASTM B564 / ASME SB-564, DIN EN 10302 |
| Delivery condition | Solution annealed |
| Issued by | Jiangyin Jiangnan Metal Co., Ltd. |
| Document | JNM-DS-N06025 |
| Last reviewed | 24 August 2026 |
| Source page | https://www.steelforgepieces.com/Nickel-Alloy/NiCr25FeAlY.html |

---

## Summary

NiCr25FeAlY is a high-carbon nickel-chromium-iron alloy. Nominal composition is 24–26 % chromium, 8–11 % iron, 1.8–2.4 % aluminium and 0.05–0.12 % yttrium, with nickel as the balance. It is registered as EN material number 2.4633 and UNS N06025, and sold commercially as Alloy 602 CA or Nicrofer 6025 HT. The alloy is used in oxidising, carburising and metal-dusting atmospheres to approximately 1,200 °C.

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. It produces NiCr25FeAlY as forged rings, seamless rolled rings, bars, discs, flanges, shafts, sleeves and tube sheets to customer drawing, supplied solution annealed with an EN 10204 3.1 certificate.

- **Alloy type:** High-carbon Ni-Cr-Fe alloy micro-alloyed with Al, Y, Ti and Zr. Not precipitation hardening.
- **Key property:** Adherent Cr₂O₃ plus Al₂O₃ double oxide scale that resists spalling under thermal cycling.
- **Service limit:** 1,200 °C for oxidation and creep. −10 to 1,150 °C for pressure equipment under VdTÜV 540.
- **Strength at 20 °C:** Rm ≥ 670 MPa, Rp0.2 ≥ 270 MPa, A5 ≥ 30 %, solution annealed.
- **Supplied by:** Jiangyin Jiangnan Metal Co., Ltd., sales@steelforgepieces.com, +86 189 2135 9659.

---

## Alloy description

NiCr25FeAlY is a heat-resistant nickel-base alloy. Three features of its chemistry distinguish it from ordinary Ni-Cr grades, and each affects how the alloy is forged.

### High carbon content

Most corrosion-resistant nickel alloys hold carbon as low as the melt shop can achieve. NiCr25FeAlY runs 0.15–0.25 % C. The carbon precipitates as primary and secondary chromium carbides that pin the grain boundaries and provide creep-rupture strength above 1,000 °C. The same carbides restrict cold formability, so hot-worked product forms are the normal route for this grade.

### Aluminium and yttrium additions

Chromium alone produces a Cr₂O₃ scale that eventually spalls under repeated heating and cooling. NiCr25FeAlY adds 1.8–2.4 % aluminium, which forms an inner alumina layer beneath the chromia, and 0.05–0.12 % yttrium, a reactive-element addition that keys the scale to the substrate. The resulting double oxide layer stays attached through thermal cycling. This is why the alloy is specified in furnaces where flaking scale would contaminate the product being heated.

### Coarse grain structure

Zirconium at 0.01–0.10 % controls grain coarsening, which allows the alloy to be annealed at very high temperature without uncontrolled growth. Solution annealing is carried out at 1,180–1,230 °C to develop a coarse grain, because coarse grain provides the creep strength in this alloy. Jiangyin Jiangnan Metal Co., Ltd. plans forging reduction and finishing temperature around this final anneal.

> **Grain size on incoming drawings.** A fine-grain acceptance criterion carried over from a steel specification works against this alloy, since coarse grain is the source of its creep strength. Where a NiCr25FeAlY drawing arrives at Jiangyin Jiangnan Metal Co., Ltd. carrying an ASTM E112 fine-grain requirement, the point is raised with the purchaser before material is cut.

---

## Equivalent designations and standards

### Table 1. Designations for NiCr25FeAlY

| System | Designation | Note |
|---|---|---|
| EN chemical | NiCr25FeAlY | Also written NiCr25Fe10AlY |
| EN material number | 2.4633 | German Werkstoff-Nr. |
| UNS | N06025 | North American unified number |
| Japan | NCF 602 | JIS designation |
| Trade names | Alloy 602 CA, Nicrofer 6025 HT, Inconel 602 CA, RA 602 CA | CA denotes controlled aluminium and carbon |
| Related grades | Alloy 603 GT, 2.4649 | 2.4649 is the common welding filler |
| Welding consumables | ENi6025, SNi6025, BNi6025 | Matching filler designations |

### Table 2. Product standards by form

| Form | ASTM / ASME | DIN / EN | Other |
|---|---|---|---|
| Forgings | ASTM B564 / ASME SB-564 | DIN EN 10302 | VdTÜV 540 |
| Rod and bar | ASTM B166 / ASME SB-166 | DIN 17752, DIN 17742 | ISO 6208 |
| Plate, sheet, strip | ASTM B168 / ASME SB-168 | DIN 17750 | — |
| Seamless pipe and tube | ASTM B163, B167 / SB-163, SB-167 | DIN 17751 | — |
| Welded pipe and tube | ASTM B516, B517, B546 | — | — |
| Fittings and flanges | ASTM B366 (WPV602 / CRV602), B462 | — | — |
| Pressure code | ASME Code Case 2359 | — | VdTÜV WB 540 |

Some older drawings cite DIN 17754 for rod and bar. That family of DIN standards has largely been superseded by DIN EN 10302 and DIN 17752. Confirm the applicable revision on the enquiry and certification will follow the nominated standard.

---

## Chemical composition

### Table 3. NiCr25FeAlY chemical composition, weight %

| Element | Min % | Max % | Function |
|---|---|---|---|
| Nickel (Ni) | Balance | Balance | Matrix |
| Chromium (Cr) | 24.0 | 26.0 | Forms the Cr₂O₃ scale |
| Iron (Fe) | 8.0 | 11.0 | Matrix, cost |
| Aluminium (Al) | 1.80 | 2.40 | Inner Al₂O₃ layer |
| Carbon (C) | 0.15 | 0.25 | Carbides, creep strength |
| Titanium (Ti) | 0.10 | 0.20 | Micro-alloying |
| Yttrium (Y) | 0.05 | 0.12 | Anchors the oxide scale |
| Zirconium (Zr) | 0.01 | 0.10 | Grain size control |
| Silicon (Si) | — | 0.50 | Residual |
| Manganese (Mn) | — | 0.50 | Residual |
| Copper (Cu) | — | 0.10 | Residual |
| Phosphorus (P) | — | 0.02 | Impurity |
| Sulphur (S) | — | 0.01 | Impurity |

Limits per EN / W.Nr. 2.4633 and UNS N06025. Individual specifications differ slightly in minor elements, so nominate the governing specification when ordering. Zirconium is a controlled element in this alloy although it is omitted from several published composition tables.

Every NiCr25FeAlY forging shipped by Jiangyin Jiangnan Metal Co., Ltd. carries the actual heat analysis on its certificate.

---

## Mechanical properties

### Table 4. Minimum mechanical properties at 20 °C, solution annealed

| Property | Symbol | Value | Unit |
|---|---|---|---|
| 0.2 % proof strength | Rp0.2 | ≥ 270 | MPa (N/mm²) |
| Tensile strength | Rm | ≥ 670 | MPa (N/mm²) |
| Elongation | A5 | ≥ 30 | % |
| Modulus of elasticity | E | 215 | GPa (kN/mm²) |

Values are typical minima for solution-annealed material. Section size, forging reduction and final grain size all affect the measured figures. Jiangyin Jiangnan Metal Co., Ltd. tests each heat and reports measured values on the EN 10204 certificate.

### Elevated-temperature behaviour

NiCr25FeAlY is selected for creep-rupture strength rather than room-temperature strength. Yield strength is modest by superalloy standards, and ASME Code Case 2359 permits higher design stresses for this grade on the basis that limited permanent deformation is acceptable in its applications. For code work, take allowable stresses from the code table rather than from a supplier data sheet.

---

## Physical properties

### Table 5. Physical properties at 20 °C

| Property | Value | Unit |
|---|---|---|
| Density | 7.9 | g/cm³ |
| Specific heat capacity | 450 | J/(kg·K) |
| Thermal conductivity | 11.3 | W/(m·K) |
| Electrical resistivity | 1.15 | Ω·mm²/m |
| Magnetic response | Non-magnetic | — |

Use 7.9 g/cm³ to estimate forging weight from a drawing. A NiCr25FeAlY ring of 600 mm OD by 400 mm ID by 200 mm high weighs approximately 250 kg as-forged before machining allowance.

---

## Service temperature limits

Oxidation resistance to 1,200 °C does not apply to pressure-retaining parts. Three separate sources govern the temperature limits for a NiCr25FeAlY design, and one band presents a ductility hazard rather than a limit.

### Table 6. Governing temperature limits

| Limit | °C | °F | Source |
|---|---|---|---|
| Oxidation and creep resistance | up to 1,200 | 2,192 | Alloy capability |
| Pressure equipment | −10 to 1,150 | 14 to 2,102 | VdTÜV data sheet 540 |
| Pressure parts, steam service | up to 899 | 1,650 | ASME Code Section I |
| Pressure vessels | up to 982 | 1,800 | ASME Section VIII Div. 1 |
| Rupture ductility caution | 649 to 760 | 1,200 to 1,400 | Solution-annealed condition |

> **Continuous service between 600 and 750 °C.** State this condition at enquiry stage. The band requires a stabilising anneal, and welded assemblies used there should receive post-weld heat treatment. Specifying it on the order adds no cost at the forging stage.

Jiangyin Jiangnan Metal Co., Ltd. requests the intended service temperature on every NiCr25FeAlY enquiry, because it determines the heat treatment applied.

---

## Atmosphere resistance

Temperature is only part of the selection. The process gas determines whether NiCr25FeAlY suits an application.

### Specified for these conditions

| Condition | Notes |
|---|---|
| Air and oxidising atmospheres to 1,200 °C | Including severe thermal cycling. The double oxide scale stays keyed to the metal instead of spalling. |
| Carburising atmospheres | Very good resistance in CH₄/H₂ and similar carbon-rich gas. The alumina layer blocks carbon ingress. |
| Metal dusting conditions | Retains creep strength through the 400 to 800 °C band in which metal dusting occurs. Used in syngas and reformer hardware. |
| Oxidising and chlorinating media | Very good high-temperature corrosion resistance. |
| Oxidising sulphur-bearing atmospheres | Good resistance, which is unusual for a nickel-base alloy, attributed to the combined chromium and aluminium content. |
| Nitriding atmospheres | The alumina layer limits nitrogen ingress. Commonly used for nitriding and carburising furnace fixtures. |

### Verify before specifying

| Condition | Notes |
|---|---|
| Strongly reducing sulphidising gas | The normal limitation of high-nickel alloys. Supply the actual oxygen and sulphur partial pressures. Oxidising sulphur service and reducing sulphur service are different cases. |
| Continuous 600 to 750 °C service | Rupture ductility falls in the solution-annealed condition. Specify a stabilising anneal. |
| Pressure-retaining duty | Code limits are well below 1,200 °C. See the temperature table above. |
| Cold forming after delivery | Primary carbides restrict cold formability. Plan hot work, or order the part closer to net shape. |
| Molten salts and molten metals | No published design basis exists for this grade. Treat as a separate materials study. |

Jiangyin Jiangnan Metal Co., Ltd. requests the process atmosphere alongside the temperature on every enquiry for this grade.

---

## Product forms and sizes

Jiangyin Jiangnan Metal Co., Ltd. produces NiCr25FeAlY by open-die forging and radial-axial ring rolling, then machines to the customer drawing. There is no fixed catalogue. Drawings, sketches and rough dimension lists are all workable starting points.

Forms produced: seamless rolled rings, forged rings, forged flanges (WN, SO, BL, to drawing), round bars, discs and blanks, shafts and spindles, sleeves and bushings, tube sheets, hollow bars and forged tubes, valve bodies, stems and seat rings, kiln rollers and furnace hardware, nozzles and manifolds.

### Table 7. Typical NiCr25FeAlY forging size range

| Form | Dimension range | Single-piece weight |
|---|---|---|
| Seamless rolled rings | OD 200–3000 mm, wall 15–350 mm, height ≤ 800 mm | 5–8000 kg |
| Forged rings | OD 150–2500 mm | 5–6000 kg |
| Discs and blanks | Ø 100–1500 mm, thickness 20–600 mm | 5–5000 kg |
| Round bars | Ø 60–800 mm, length ≤ 6000 mm | 10–6000 kg |
| Shafts | Ø 80–700 mm, length ≤ 6000 mm | 20–6000 kg |
| Flanges | DN 15–DN 2000 | 1–4000 kg |
| Sleeves, bushings, hollow bars | OD 120–1600 mm, ID ≥ 60 mm | 5–4000 kg |
| Tube sheets | Ø ≤ 3000 mm, thickness ≤ 400 mm | to 8000 kg |

Ranges are indicative. Send the drawing and feasibility, reduction ratio and weight will be confirmed against actual furnace, press and ring-mill capacity. Delivery condition options are as-forged with black scale, shot blasted, rough machined or finish machined.

---

## Manufacturing route

1. **Melting.** Electric arc furnace with AOD or VOD refining. Electroslag remelting is added where the drawing or specification calls for improved cleanliness and reduced segregation.
2. **Ingot to billet.** The ingot is cogged down and cropped. NiCr25FeAlY has a narrow hot-working window, so the billet is reheated between passes rather than worked through in a single heat.
3. **Open-die forging or ring rolling.** Hydraulic press forging or radial-axial ring rolling to the rough shape. Reduction ratio is planned to close porosity through the section and to leave a uniform structure for the final anneal.
4. **Solution annealing.** 1,180 to 1,230 °C, held according to section thickness, then cooled rapidly. No ageing treatment is applied.
5. **Stabilising anneal where specified.** Applied where the part will run continuously in the 600 to 750 °C band, to restore rupture ductility before service.
6. **Rough or finish machining.** Scale removal and turning or boring to the dimensions agreed on the drawing.
7. **Non-destructive testing.** Ultrasonic examination to EN 10228-3, SEP 1921 or ASTM A388 at the acceptance class stated on the order. Dye penetrant to ASTM E165 where surface indications matter.
8. **Testing, marking and packing.** Heat chemistry, PMI, tensile and hardness testing compiled into an EN 10204 3.1 or 3.2 certificate. Heat number hard stamped or vibro-etched on the piece.

---

## Testing, inspection and certification

### Table 8. Standard and optional inspection scope

| Check | Method / standard | Scope |
|---|---|---|
| Chemical analysis | Spectrometer, ladle and product | Standard |
| Material identification | PMI, portable XRF or OES | Standard |
| Tensile and elongation | ASTM E8 / ISO 6892-1 | Standard |
| Hardness | Brinell, ASTM E10 | Standard |
| Heat-treatment record | Furnace chart, anneal temperature and cooling | Standard |
| Dimensional report | Against approved drawing | Standard |
| Ultrasonic examination | EN 10228-3, SEP 1921 or ASTM A388, class as ordered | Standard on rings and heavy sections |
| Liquid penetrant | ASTM E165 / EN ISO 3452 | On request |
| Elevated-temperature tensile | ISO 6892-2 | On request |
| Stress rupture and creep | ASTM E139, per agreed conditions | On request |
| Grain size and micrograph | ASTM E112 | On request |
| Intergranular corrosion | ASTM G28 or as agreed | On request |
| Inspection document | EN 10204 type 3.1; type 3.2 witnessed by SGS, BV, TÜV, LR, DNV or a nominated inspector | Standard / on request |

### Ultrasonic testing of this grade

Coarse-grained nickel alloys attenuate ultrasound considerably more than steel, and NiCr25FeAlY is deliberately coarse-grained. Probe frequency and calibration blocks must be selected for the grade rather than carried over from carbon-steel practice, otherwise the examination will under-report indications.

---

## Applications

### Table 9. NiCr25FeAlY forgings by industry and component

| Industry | Typical forged components | Reason for selection |
|---|---|---|
| Industrial furnaces | Radiant tube parts, muffles, retorts, kiln rollers, roller-hearth and walking-beam hardware, burner components | Scale remains attached under thermal cycling |
| Heat treatment plant | Fixtures, grids, fan hubs, charging hardware for carburising and nitriding furnaces | Carburisation and nitriding resistance |
| Petrochemical and hydrogen | Reformer hardware, cracking furnace internals, flanges, tube sheets, nozzles | Metal-dusting resistance with creep strength |
| Power generation | High-temperature ducting rings, expansion components, combustor and burner hardware | Creep strength above 1,000 °C |
| Waste to energy | Boiler and incinerator components, support rings, sleeves | Oxidising and chlorinating media resistance |
| Glass and ceramics | Melting furnace parts, handling and support hardware | No spalling scale to contaminate product |
| Automotive and engines | Glow plug and exhaust hardware, turbocharger parts, high-temperature test rig fixtures | Cyclic oxidation resistance |
| Chemical process | Calciner and rotary kiln internals, reactor rings, valve components | Oxidising service with mechanical duty |

---

## Welding, heat treatment and machining

**Welding.** Weldability is fair by GTAW, plasma, GMAW and SMAW. Matching filler 2.4649 (ENi6025 / SNi6025) or the base grade is normally used, and preheating is not usually required. Adequate back shielding is needed on all gas-shielded welds. Post-weld heat treatment is recommended where welded components will operate between 600 and 750 °C.

**Hot and cold working.** Hot work in the recommended range and solution anneal afterwards. A further solution anneal is required before service where cold deformation exceeds approximately 7 %. Cold formability is restricted by the high proportion of primary carbides.

**Machining.** NiCr25FeAlY behaves as a work-hardening nickel alloy containing hard primary carbides. Use rigid setups, sharp positive-rake carbide tooling, heavy constant feed, moderate speed and generous coolant. Do not allow the tool to dwell or rub, since a rubbing edge work-hardens the surface and the following pass then has to cut through the hardened layer.

---

## Ordering information

Send the following to Jiangyin Jiangnan Metal Co., Ltd. for a firm price and lead time, normally returned within one working day.

1. **Grade and specification.** NiCr25FeAlY, Alloy 602 CA, 2.4633 or UNS N06025, together with the governing specification such as ASTM B564 or DIN EN 10302.
2. **Drawing or dimensions.** A 2D drawing or PDF is preferred. Otherwise state OD, ID, height or length and wall thickness, and whether those are finished or rough dimensions.
3. **Quantity and delivery date.** Piece count and required date.
4. **Delivery condition.** As-forged, shot blasted, rough machined or finish machined.
5. **Testing and certification.** UT standard and acceptance class, any additional testing, EN 10204 3.1 or 3.2, and any nominated inspection body.
6. **Service temperature and atmosphere.** Operating temperature and the furnace or process gas. Continuous service in the 600 to 750 °C band requires a stabilising anneal, so this information changes the heat treatment applied to the part.

Email: sales@steelforgepieces.com | Telephone: +86 189 2135 9659

---

## Frequently asked questions

**What is NiCr25FeAlY?**
NiCr25FeAlY is the EN chemical designation for a high-carbon nickel-chromium-iron alloy containing 24 to 26 % chromium and 8 to 11 % iron, micro-alloyed with 1.8 to 2.4 % aluminium, 0.05 to 0.12 % yttrium, titanium and zirconium, with nickel as the balance. It is registered as material number 2.4633 and UNS N06025, and sold under the trade names Alloy 602 CA and Nicrofer 6025 HT. Jiangyin Jiangnan Metal Co., Ltd. supplies it as open-die forgings.

**Is NiCr25FeAlY the same as Alloy 602 CA and UNS N06025?**
Yes. NiCr25FeAlY, 2.4633, UNS N06025, Alloy 602 CA and Nicrofer 6025 HT all describe the same alloy. NiCr25Fe10AlY, Alloy 603 GT and JIS NCF 602 are also used. Composition limits vary slightly between specifications, so name the governing standard on the order.

**What is the maximum service temperature of NiCr25FeAlY?**
Approximately 1,200 °C (2,192 °F) for oxidation and creep resistance. Limits for pressure-retaining equipment are lower: −10 to 1,150 °C under VdTÜV material data sheet 540, 899 °C (1,650 °F) under ASME Code Section I, and 982 °C (1,800 °F) under ASME Section VIII Division 1.

**Why does NiCr25FeAlY resist oxidation so well?**
The high chromium content forms a chromium-oxide scale and the 1.8 to 2.4 % aluminium forms an inner alumina layer. The yttrium addition anchors the scale to the metal so that it does not spall during thermal cycling. The double oxide layer remains dense and adherent under cyclic heating.

**Does NiCr25FeAlY resist sulphur-bearing atmospheres?**
In oxidising sulphur-bearing atmospheres at elevated temperature the resistance is good, which is unusual for a nickel-base alloy and is attributed to the combined chromium and aluminium content. Strongly reducing sulphidising atmospheres are a separate case and represent the normal limitation of high-nickel alloys. Confirm the actual oxygen and sulphur partial pressures against process data before specifying the grade.

**Does NiCr25FeAlY resist metal dusting and carburisation?**
Yes. NiCr25FeAlY has very good resistance in carburising and oxidising-chlorinating media and under metal-dusting conditions. The alumina and chromia scale blocks carbon ingress, and the alloy retains creep strength through the 400 to 800 °C band in which metal dusting occurs.

**Which forged shapes can be made in NiCr25FeAlY?**
Seamless rolled rings, forged rings, round bars, shafts and spindles, discs and blanks, flanges, sleeves, bushings, tube sheets, hollow bars, forged tubes, valve bodies and stems, kiln rollers and furnace hardware, and nozzles, as-forged or machined to the customer drawing.

**What heat treatment is applied to NiCr25FeAlY forgings?**
Solution annealing at 1,180 to 1,230 °C followed by rapid cooling. The high annealing temperature develops a coarse grain, which provides the creep strength of the alloy. NiCr25FeAlY is not a precipitation-hardening alloy and no ageing treatment is applied.

**Why is NiCr25FeAlY annealed at such a high temperature?**
Creep strength in this alloy comes from a coarse grain structure. Annealing near 1,220 °C develops that grain size, and the zirconium addition keeps the growth controlled. A fine-grain acceptance criterion carried over from a steel specification would work against the alloy.

**Is there a temperature range NiCr25FeAlY should not be used in?**
In the solution-annealed condition NiCr25FeAlY loses stress-rupture ductility between approximately 649 and 760 °C (1,200 to 1,400 °F). A stabilising anneal is normally specified for continuous service around 600 to 750 °C.

**Can NiCr25FeAlY be welded?**
Yes. Weldability is fair by GTAW, plasma, GMAW and SMAW. Matching filler 2.4649 (ENi6025 / SNi6025) or the base grade is normally used and preheating is not usually required. Post-weld heat treatment is recommended where the welded component will operate between 600 and 750 °C.

**What certificates come with NiCr25FeAlY forgings?**
An EN 10204 3.1 inspection certificate is standard, covering heat chemistry, mechanical test results, heat-treatment record, dimensional report and NDT report. EN 10204 3.2 countersigned by SGS, BV, TÜV, Lloyd's Register or DNV is available on request.

**How is NiCr25FeAlY different from Inconel 601 and Incoloy 800HT?**
NiCr25FeAlY contains more chromium and carbon than Inconel 601 and adds yttrium, giving a more adherent scale and higher creep strength above 1,000 °C. Incoloy 800HT is iron-based with 30 to 35 % nickel and is normally used at lower temperatures.

**What is the minimum order quantity for NiCr25FeAlY forgings?**
Single-piece prototype orders are accepted as well as series production. Most sizes are melted to order, so the practical minimum is set by the ingot or billet required for the part.

**Where are these NiCr25FeAlY forgings made?**
At Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, approximately 150 km from Shanghai port.

---

## Manufacturer

**Jiangyin Jiangnan Metal Co., Ltd.**
Open-die forging factory
No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Telephone: +86 189 2135 9659
Email: sales@steelforgepieces.com
Website: https://www.steelforgepieces.com/

- Open-die forging and radial-axial ring rolling on one site
- Made to drawing, with no catalogue restrictions and no fixed stock sizes
- Full traceability from heat number to finished piece
- EN 10204 3.1 as standard, 3.2 with third-party inspection on request
- Rough machined or finish machined delivery
- Quotation normally returned within one working day

---

## Reference standards

EN and DIN material listings for 2.4633; ASTM B564 with ASME SB-564 for forgings; ASTM B166, B168, B163, B167, B516, B517, B546, B366 and B462 with their ASME SB equivalents; DIN EN 10302; DIN 17742, 17750, 17751 and 17752; VdTÜV material data sheet 540; ASME Code Case 2359. Ultrasonic acceptance follows EN 10228-3, SEP 1921 or ASTM A388. Inspection documents follow EN 10204.

Where a customer nominates a specific revision, Jiangyin Jiangnan Metal Co., Ltd. certifies to that revision and its limits govern over the figures shown here.

Last technical review: 24 August 2026. This page describes material properties in general terms and is not a design authority. Take allowable design stresses from the applicable pressure code and confirm atmosphere behaviour against actual process data.

---

## Citation

Jiangyin Jiangnan Metal Co., Ltd. (2026). NiCr25FeAlY (Alloy 602 CA / W.Nr. 2.4633 / UNS N06025): Material Data Sheet for Open-Die Forgings. Jiangyin, Jiangsu, China. https://www.steelforgepieces.com/Nickel-Alloy/NiCr25FeAlY.html

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