NiCr29Fe Forgings
Alloy 690 · UNS N06690 · W.Nr. 2.4642 · DIN 17742
NiCr29Fe is a nickel-chromium-iron alloy with 58 % minimum nickel and 27 to 31 % chromium. It is sold internationally as Alloy 690 and Inconel 690. The high chromium content forms a Cr₂O₃ passive film. This gives the alloy its resistance to oxidising acids, high-temperature sulphidation and stress-corrosion cracking. Jiangyin Jiangnan Metal Co., Ltd. forges NiCr29Fe at its open-die plant in Jiangyin, Jiangsu Province, China, as seamless rolled rings, discs, flanges, bars, sleeves, tube sheets and shafts.
- NiCr29Fe EN
- 2.4642 W.Nr.
- N06690 UNS
- Alloy 690 trade
- Inconel 690 trade
- Nicrofer 6030 VDM
- NiCr29Fe9 ISO
- NW6690 ISO
- NC30Fe AFNOR
- NCF690 JIS
- NS3105 / NS315 GB
- 0Cr30Ni60Fe10 GB
- Nickel
- 58 % min
- Chromium
- 27–31 %
- Density
- 8.19 g/cm³
- Tensile, min
- 586 MPa
- Melt route
- EAF+VOD+ESR
- Certificate
- EN 10204 3.1
Send a drawing or a size list. Jiangyin Jiangnan Metal quotes NiCr29Fe forgings to your specification, including single replacement pieces.
Request a quotationWhat is NiCr29Fe?
NiCr29Fe is the European (EN) chemical designation for a solid-solution nickel-chromium-iron alloy, material number 2.4642. DIN 17742 covers it for wrought products. The same material is sold as Alloy 690, Inconel 690, UNS N06690 and Nicrofer 6030.
The alloy is not precipitation hardened. Almost all of its performance comes from chromium. At 27 to 31 % Cr it carries about twice the chromium of a 300-series stainless steel and roughly 1.9 times that of Inconel 600. The chromium forms a dense Cr₂O₃ layer that repairs itself in service. That is the reason NiCr29Fe gets specified for nitric acid plant, nuclear steam generators, spent fuel reprocessing and waste vitrification melters, where oxidising media strip the passive film off lower-chromium alloys.
NiCr29Fe is single phase and stays ductile at forging temperature, so it takes open-die forging and ring rolling well. Jiangyin Jiangnan Metal supplies it forged rather than machined from bar stock. Grain flow then follows the part contour, which matters on pressure-boundary components such as valve bodies, tube sheets and flanges.
Is NiCr29Fe the same as Inconel 690?
Yes. NiCr29Fe, Alloy 690 and Inconel 690 are one material under three naming systems: the EN chemical name, the generic trade grade and a registered trade name. A drawing calling out any designation in the table below can be quoted and forged by Jiangyin Jiangnan Metal from the same heat.
| Standards body or origin | Designation | Notes |
|---|---|---|
| EN, chemical name | NiCr29Fe | Used on European drawings and mill certificates |
| EN / DIN, material number | W.Nr. 2.4642 | 2.4xxx numbers are nickel alloys, 1.4xxx are steels |
| UNS (USA) | N06690 | Referenced by ASTM B166, B167, B168 and B564 |
| Generic trade grade | Alloy 690 | Common commercial shorthand |
| Special Metals | Inconel 690 | Registered trade name |
| VDM Metals | Nicrofer 6030 | Registered trade name |
| ISO | NiCr29Fe9 / NW6690 | Chemical and numeric ISO forms |
| AFNOR (France) | NC30Fe | |
| JIS (Japan) | NCF690 | |
| GB (China) | NS3105 / NS315 / 0Cr30Ni60Fe10 | Chinese national designations |
Check the material number before ordering. NiCr29Fe is 2.4642. Drawings sometimes transpose it to 2.4622, which is a different alloy. Jiangyin Jiangnan Metal confirms the material number against the chemistry before releasing any NiCr29Fe order to the press.
NiCr29Fe chemical composition
The composition below is the DIN 17742 and ASTM B564 range for NiCr29Fe (UNS N06690). Every NiCr29Fe forging shipped by Jiangyin Jiangnan Metal carries the actual heat analysis, not only the specification range.
| Element | Symbol | Minimum | Maximum |
|---|---|---|---|
| Nickel | Ni | 58.0 | balance |
| Chromium | Cr | 27.0 | 31.0 |
| Iron | Fe | 7.0 | 11.0 |
| Carbon | C | – | 0.05 |
| Manganese | Mn | – | 0.50 |
| Silicon | Si | – | 0.50 |
| Copper | Cu | – | 0.50 |
| Sulphur | S | – | 0.015 |
Carbon is held to 0.05 % max to limit grain-boundary carbide precipitation and keep intergranular corrosion resistance in the annealed condition.
NiCr29Fe mechanical and physical properties
Values are for the solution-annealed condition at room temperature. These are the minimum properties Jiangyin Jiangnan Metal certifies on NiCr29Fe forgings unless the customer specification calls for more.
Mechanical properties, solution annealed
| Property | Metric | Imperial |
|---|---|---|
| Tensile strength, Rm | ≥ 586 MPa | ≥ 85 ksi |
| Yield strength, Rp0.2 | ≥ 241 MPa | ≥ 35 ksi |
| Elongation, A5 | ≥ 30 % | ≥ 30 % |
| Modulus of elasticity | 211 GPa | 30.6 × 10⁶ psi |
| Hardness, typical | ≤ 90 HRB | ≤ 90 HRB |
Physical properties
| Property | Value |
|---|---|
| Density | 8.19 g/cm³ (0.296 lb/in³) |
| Melting range | 1343 to 1377 °C (2450 to 2510 °F) |
| Specific heat capacity | 450 J/kg·K |
| Thermal conductivity | 13.5 W/m·K |
| Coefficient of thermal expansion, 20 to 200 °C | 14.1 µm/m·K |
| Electrical resistivity | 1.15 µΩ·m |
| Relative magnetic permeability | 1.01 max, essentially non-magnetic |
NiCr29Fe forged product forms and size envelope
Jiangyin Jiangnan Metal produces NiCr29Fe in the open-die and ring-rolled forms listed below. Parts are supplied rough machined with grinding allowance as standard, or finish machined to drawing on request.
| Product form | Outside diameter | Wall / thickness | Height / length | Piece weight |
|---|---|---|---|---|
| Seamless rolled ring | 200 to 2500 mm | 30 to 400 mm | 40 to 800 mm | ≤ 3000 kg |
| Forged disc / disk | 100 to 1800 mm | 20 to 500 mm | – | ≤ 3000 kg |
| Forged flange | ≤ 2500 mm | to drawing | – | ≤ 3000 kg |
| Forged round bar | 50 to 800 mm | – | ≤ 6000 mm | ≤ 3000 kg |
| Sleeve / bushing | ≤ 1500 mm | 20 to 300 mm | ≤ 2000 mm | ≤ 2500 kg |
| Shaft / spindle | 80 to 800 mm | – | ≤ 8000 mm | ≤ 5000 kg |
| Tube sheet | ≤ 2000 mm | ≤ 400 mm | – | ≤ 3000 kg |
| Valve body / block | to drawing | to drawing | to drawing | ≤ 3000 kg |
Also produced in NiCr29Fe: forged tubes and hollow bars, nozzles, tube plates, valve stems, valve seat rings, gear blanks, rolls, wheels, crankshafts and eccentric shafts. For a geometry outside the envelope above, send the drawing to sales@steelforgepieces.com. Many oversized parts can still be produced as a split or welded-assembly forging.
How NiCr29Fe forgings are made
NiCr29Fe has a narrow forging window and work hardens quickly, so the route below is followed on every order. Each step is recorded and traceable to the heat number.
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Melting, EAF + VOD + ESR
NiCr29Fe is melted by electric arc furnace, refined by vacuum oxygen decarburisation to hold carbon below 0.05 %, then electroslag remelted. ESR removes the sulphide and oxide stringers that open up as forging defects in a 30 % chromium alloy.
-
Ingot heating and open-die forging
The ingot is soaked and forged with repeated upsetting and drawing to break down the cast structure. Reduction ratio is controlled so the finished NiCr29Fe forging has a wrought, equiaxed grain structure through the full section.
-
Ring rolling or die forming
For seamless rolled rings the pierced blank is rolled to final proportions on a radial-axial mill, which gives circumferential grain flow. Discs, flanges, shafts and sleeves are formed on the press with saddles and mandrels.
-
Solution annealing
Forgings are solution annealed and rapidly cooled to dissolve chromium carbides and restore corrosion resistance. Where the specification calls for it, commonly on nuclear steam generator work, Jiangyin Jiangnan Metal also runs the thermal treatment (TT) cycle used to improve resistance to primary-water stress corrosion cracking.
-
Rough machining, NDT and release
Parts are rough machined to give clean ultrasonic entry surfaces, then tested, marked with heat number and part number, and released with the mill certificate.
Testing, inspection and certification
Every NiCr29Fe forging from Jiangyin Jiangnan Metal is ultrasonically tested and supplied with a material certificate. The acceptance standard is agreed before production and stated on the order confirmation.
| Item | Standard | Scope |
|---|---|---|
| Ultrasonic testing | EN 10228-3 | Ferritic and austenitic forgings, quality class by agreement |
| Ultrasonic testing | SEP 1921 | German UT acceptance classes for forgings |
| Ultrasonic testing | ASTM A388 | Straight-beam and angle-beam examination of heavy forgings |
| Chemical analysis | Heat and product analysis | Spectrometric, reported on the certificate |
| Mechanical testing | Tensile, hardness, impact | Room temperature, elevated temperature on request |
| Intergranular corrosion | ASTM G28 / ASTM A262 | On request for acid-service parts |
| Grain size | ASTM E112 | On request |
| Dimensional | To customer drawing | Report issued with each lot |
| Material certificate | EN 10204 3.1 | Issued by Jiangyin Jiangnan Metal as standard |
| Third-party certificate | EN 10204 3.2 | TÜV, BV, SGS, Lloyd's or customer-nominated inspector |
Delivery standard for NiCr29Fe forgings is DIN 17742. ASTM B564 and ASME SB-564 for nickel alloy forgings, or ASTM B166 for rod and bar, can be certified instead where the drawing calls for the American specification.
Where NiCr29Fe forgings are used
NiCr29Fe gets specified where oxidising conditions, chloride stress-corrosion cracking or high-temperature sulphidation rule out stainless steel and lower-chromium nickel alloys. The table maps the industries Jiangyin Jiangnan Metal supplies against the forged parts most often ordered in this grade.
| Industry | Typical NiCr29Fe forgings | Reason for the grade |
|---|---|---|
| Nuclear power | Steam generator tube sheets, baffles, forged rings, nozzles, flanges | Resistance to primary-water stress corrosion cracking |
| Nitric and sulphuric acid plant | Valve bodies, seat rings, valve stems, flanges, forged pipe | High chromium resists strongly oxidising acids |
| Chemical processing | Pump shafts, plunger pump parts, sleeves, bushings, forged discs | General aqueous corrosion resistance with useful strength |
| Pressure vessels and heat exchangers | Tube sheets, forged tubes, shell flanges, forged rings | Weldable, code certifiable, stable at temperature |
| Oil and gas, offshore | Subsea components, wellhead parts, Christmas tree blocks, forged bar | Chloride SCC resistance in sour and marine service |
| Power transmission and turbomachinery | Gear blanks, spindles, shafts, compressor and turbine rings | Holds mechanical properties at elevated temperature |
| Waste incineration and vitrification | Melter components, forged rolls, wheels, manifolds | Sulphidation and hot-gas corrosion resistance |
| Pulp, paper and pharmaceutical | Rolls, forged discs, agitator shafts, crystalliser parts | Clean surface, resistance to bleaching chemistry |
NiCr29Fe vs Inconel 600 vs Incoloy 800H
These three nickel alloys are often cross-shopped. The main difference is chromium content, and therefore behaviour in oxidising media.
| Property | NiCr29Fe / Alloy 690 | Inconel 600 / N06600 | Incoloy 800H / N08810 |
|---|---|---|---|
| Nickel | 58 % min | 72 % min | 30 to 35 % |
| Chromium | 27 to 31 % | 14 to 17 % | 19 to 23 % |
| Iron | 7 to 11 % | 6 to 10 % | 39.5 % min |
| Tensile, min | 586 MPa | 550 MPa | 450 MPa |
| Oxidising acid (HNO₃) | Excellent | Limited | Moderate |
| Chloride SCC | Excellent | Good | Moderate |
| High-temperature creep | Good | Good | Excellent, to 1100 °C |
| Relative cost | Highest | Medium | Lowest |
| Choose it when | Oxidising acids, nuclear primary water | Caustic, chlorination, dry HCl | Long-term creep at high temperature |
Jiangyin Jiangnan Metal forges all three grades, so the same part can be quoted in Inconel 600, Incoloy 800H and NiCr29Fe side by side before the material decision is fixed.
NiCr29Fe forging FAQ
What is NiCr29Fe?
NiCr29Fe is a nickel-chromium-iron alloy with 58 % minimum nickel and 27 to 31 % chromium, designated W.Nr. 2.4642 and UNS N06690. It is the EN chemical name for the alloy sold commercially as Alloy 690 or Inconel 690, and it is standardised for wrought products in DIN 17742.
Is NiCr29Fe the same as Inconel 690?
Yes. NiCr29Fe (EN), Alloy 690 (generic), Inconel 690 (Special Metals), Nicrofer 6030 (VDM), UNS N06690, NCF690 (JIS) and NS3105 (GB) all designate the same material. Jiangyin Jiangnan Metal quotes and certifies against whichever designation appears on the customer drawing.
Which standards cover NiCr29Fe forgings?
DIN 17742 is the primary delivery standard for NiCr29Fe. ASTM B564 and ASME SB-564 cover nickel alloy forgings in UNS N06690, ASTM B166 covers rod and bar, and ASTM B168 covers plate and sheet. Ultrasonic acceptance is normally to EN 10228-3, SEP 1921 or ASTM A388.
What heat treatment is applied to NiCr29Fe forgings?
Solution annealing followed by rapid cooling is standard. It dissolves chromium carbides and restores corrosion resistance. NiCr29Fe is not precipitation hardenable, so no ageing step is needed for strength. A separate thermal treatment (TT) cycle is available where a nuclear specification requires improved resistance to primary-water stress corrosion cracking.
Why is NiCr29Fe used in nuclear steam generators?
Its 30 % chromium content resists primary-water stress corrosion cracking better than the Alloy 600 it replaced in pressurised water reactor steam generator tubing and tube sheets.
Can NiCr29Fe be forged into seamless rolled rings?
Yes. NiCr29Fe is single phase and ductile at forging temperature. Jiangyin Jiangnan Metal ring-rolls it on a radial-axial mill to give circumferential grain flow, in sizes from 200 mm to 2500 mm outside diameter.
What non-destructive testing is performed?
Ultrasonic testing is standard on every NiCr29Fe forging, to EN 10228-3, SEP 1921 or ASTM A388 depending on the order. Liquid penetrant testing, intergranular corrosion testing to ASTM G28 or A262, and grain size determination to ASTM E112 are available on request.
What certificates are supplied with NiCr29Fe forgings?
An EN 10204 3.1 material certificate with the actual heat analysis, mechanical test results and NDT report is issued as standard. EN 10204 3.2 certification by TÜV, BV, SGS, Lloyd's Register or a customer-nominated inspector is available where the contract requires third-party witness.
What is the largest NiCr29Fe forging available?
Jiangyin Jiangnan Metal produces NiCr29Fe shafts up to 8000 mm long and rings to 2500 mm outside diameter, with piece weights to about 5000 kg. Parts outside that envelope should be sent as a drawing for review. Some can be produced as split or welded-assembly forgings.
Who supplies NiCr29Fe 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 NiCr29Fe rings, discs, flanges, bars, sleeves, tube sheets and shafts. Enquiries: sales@steelforgepieces.com, +86 189 2135 9659.
Is there a minimum order quantity for NiCr29Fe?
No fixed minimum. Jiangyin Jiangnan Metal quotes single-piece NiCr29Fe forgings for replacement and prototype work as well as production batches, because open-die forging does not require a closed die to be cut first.
Request a NiCr29Fe forging quotation
To quote a NiCr29Fe forging, Jiangyin Jiangnan Metal needs the drawing or rough dimensions, the quantity, the delivery condition (as forged, rough machined or finish machined), the certificate level (EN 10204 3.1 or 3.2) and any NDT acceptance class. A budget price normally follows within one working day.
- Company
- Jiangyin Jiangnan Metal Co., Ltd.
Open-die forging factory - Address
- No.1 Chengxiqiao Road,
Zhouzhuang Town, Jiangyin City,
Jiangsu Province, China - Telephone / WhatsApp
- +86 189 2135 9659
Technical data reviewed by the metallurgical department of Jiangyin Jiangnan Metal Co., Ltd. Last updated .