Casings, shrouds, combustion supports
Seamless rolled rings and forged shafts running hot in air, where scaling resistance counts for more than creep strength.
Material datasheet and supply capability
Rev. 2026-08 / Jiangyin Jiangnan Metal
2.4630 NiCr20Ti open-die forgings: seamless rolled rings, round bars, discs, flanges, shafts, sleeves, bushings, tube sheets and pipes, forged to drawing in Jiangyin, China.
- Werkstoff
- 2.4630
- UNS
- N06075
- EN name
- NiCr20Ti
- Trade name
- Nimonic 75
- Standard
- DIN 17744
- Type
- Ni-Cr 80/20
01What 2.4630 is
Summary
2.4630 is the German material number for NiCr20Ti, a solid-solution-strengthened 80/20 nickel-chromium alloy with controlled titanium and carbon additions. The same base material is sold as Nimonic 75 and listed as UNS N06075. It is specified for hot parts that need oxidation resistance to 1100 °C and easy welding, rather than high creep strength.
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. We forge 2.4630 into rings, seamless rolled rings, bars, discs, flanges, shafts, sleeves, bushings and tube sheets to customer drawings. Certificates are issued to EN 10204 3.1 or 3.2, and ultrasonic examination follows EN 10228-3, SEP 1921 or ASTM A388.
- Nickel
- Balance approx. 75%
- Chromium
- 18-21 %
- Density
- 8.37 g/cm³
- Max. oxidation
- 1100 °C
- Tensile Rm
- 620 min MPa
- Strengthening
- Solid solution
The age-hardening members of the Nimonic family carry enough aluminium and titanium to precipitate a γ′ phase. 2.4630 does not. Its strength comes from chromium held in solid solution, with grain boundaries pinned by titanium-rich MC carbides. That keeps the alloy soft enough to form, weld and machine, and it also rules the grade out for highly stressed rotating parts above roughly 815 °C.
In practice the grade suits 550 °C to 1100 °C in oxidising atmospheres at low to moderate stress. Below 550 °C an austenitic stainless such as 321 or 347 will usually do the same job for less money. Above 815 °C under sustained load, go to a precipitation-hardened grade such as Nimonic 80A or Waspaloy.
02Designations and equivalent standards
2.4630 turns up under several names on drawings and enquiries. Everything in the table below refers to the same base alloy, so a drawing quoting any one of them can normally be quoted from the same billet stock.
| System | Designation | Notes |
|---|---|---|
| Werkstoffnummer | 2.4630 | German material number, general condition |
| Werkstoffnummer | 2.4951 | Used in some datasheets for the solution-annealed condition |
| EN / DIN name | NiCr20Ti | Chemical name designation |
| UNS | N06075 | Unified Numbering System, USA |
| Trade names | Nimonic 75, Alloy 75 | Nimonic is a trademark of Special Metals Corporation |
| DIN | 17742 / 17744 | Wrought nickel alloys: bar, forgings, semi-finished |
| ISO | 9723 / 9724 / 9725 | Bar, wire and forgings in nickel and nickel alloys |
| BS | HR 5, HR 203, HR 403, HR 504 | British heat-resisting series |
Treat these equivalents as indicative. Composition tolerances differ slightly between the DIN, ISO and BS documents. Silicon, for example, is capped at 1.00 % under DIN 17744 but given a narrower 0.30 to 0.70 % band in some ISO tables. Name one controlling specification and revision on the purchase order, and check it against the material test certificate.
03Chemical composition of 2.4630
The composition below is the DIN 17744 range we apply to 2.4630 forgings. Heat analysis, plus product analysis where the order calls for it, is reported on the EN 10204 certificate.
| Element | Min % | Max % | Role in the alloy |
|---|---|---|---|
| Nickel (Ni) | Balance, approx. 75 | Austenitic matrix, thermal stability | |
| Chromium (Cr) | 18.00 | 21.00 | Forms the protective Cr₂O₃ scale, solid-solution strengthening |
| Titanium (Ti) | 0.20 | 0.60 | Forms MC carbides that pin grain boundaries |
| Carbon (C) | 0.08 | 0.15 | Carbide former, controls grain growth |
| Iron (Fe) | - | 5.00 | Residual from raw material |
| Manganese (Mn) | - | 1.00 | Deoxidiser, sulphur control |
| Silicon (Si) | - | 1.00 | Deoxidiser, assists scale adhesion |
| Copper (Cu) | - | 0.50 | Residual limit |
| Aluminium (Al) | - | 0.30 | Residual deoxidiser, not a strengthener at this level |
| Sulphur (S) | - | 0.015 | Held low to avoid hot shortness during forging |
Melting route. We melt 2.4630 by EAF + VOD. ESR remelting is available where the order calls for improved cleanliness, tighter segregation control or aerospace-level ultrasonic acceptance. Tell us the required melt practice at enquiry stage, since it affects both price and lead time.
04Mechanical properties
These values are for the solution-annealed condition at room temperature, and are typical of forged bar and ring sections. Guaranteed values depend on section size, sampling position and the controlling specification, and are agreed at order stage.
| Property | Typical | Minimum | Unit |
|---|---|---|---|
| Tensile strength, Rm | 650-750 | 620 | MPa |
| Yield strength, Rp0.2 | 240-300 | 200 | MPa |
| Elongation, A₅ | 35-45 | 30 | % |
| Reduction of area, Z | 40-55 | 35 | % |
| Hardness | 150-200 | 230 max | HB |
| Modulus of elasticity, E | approx. 206 | - | GPa |
Use these ranges for procurement and feasibility work, not as design allowables. Design against the controlling code together with the certified test results for the delivered heat.
05Physical properties
| Property | Value | Unit |
|---|---|---|
| Density | 8.37 | g/cm³ (0.302 lb/in³) |
| Melting range | 1340-1380 | °C |
| Thermal conductivity | approx. 11.7 | W/(m·K) |
| Specific heat capacity | approx. 460 | J/(kg·K) |
| Mean coefficient of expansion, 20-100 °C | approx. 11.7 | 10⁻₆/K |
| Electrical resistivity | approx. 1.20 | µΩ·m |
| Magnetic response | Non-magnetic | - |
| Max. oxidation service temperature | 1100 | °C |
06Forging window and heat treatment
2.4630 forges readily but work-hardens quickly, so both the temperature window and the finishing temperature matter. These are the parameters we work to on the shop floor.
| Operation | Parameter | Purpose and cautions |
|---|---|---|
| Billet soak | 1080-1170 °C | Uniform through-heating before the first blow |
| Hot working range | 1050-1200 °C | Open-die forging, ring rolling, upsetting, drawing out |
| Maximum billet temperature | 1200 °C | Above this, low-melting grain-boundary constituents can start to melt |
| Finish forging temperature | 950 °C min | Finishing below this promotes strain cracking |
| Forging reduction ratio | 3:1 min | Breaks down the cast structure and homogenises properties |
| Reheat soak | 30 min max per reheat | Longer soaks coarsen grain. Multiple reheats are acceptable |
| Solution anneal | 1050-1080 °C | Air cool or water quench, restores ductility before machining and welding |
| Cooling after forging | Slow cool | Heavy sections cooled slowly to avoid thermal cracking |
Welding and machining
2.4630 welds by MMA, TIG, MIG and submerged-arc processes, normally in the solution-annealed condition. Post-weld heat treatment is not usually needed, though a solution anneal at about 1050 °C is worth doing if the component will run above 700 °C. The alloy work-hardens roughly 1.5 times faster than Type 304 stainless, so machining wants rigid setups, positive rake, a heavy constant feed and plenty of coolant. Keep sulphur-bearing lubricants away from it, since they can embrittle nickel alloys at temperature.
07Product forms and size capability
Every 2.4630 item is forged to the customer's drawing. The ranges below describe the normal working envelope of our Jiangyin plant. Sizes outside them can often be produced by agreement.
| Product form | Size range | Typical use |
|---|---|---|
| Seamless rolled rings | OD 200-4000 mm, wall 30 mm min, height 1000 mm max | Turbine casings, combustion supports, flanged rings |
| Forged round bars | Dia. 80-1200 mm, length 6000 mm max | Shafts, spindles, valve stems, machining stock |
| Forged discs and blanks | Dia. 2500 mm max | Blind flanges, closure heads, cover plates |
| Forged flanges | Dia. 3000 mm max | Pressure-vessel and piping connections |
| Sleeves and bushings | ID 60 mm min, OD 2000 mm max | Bearing housings, wear sleeves, liners |
| Forged tube sheets | Dia. 3000 mm max | Shell-and-tube heat exchangers |
| Forged tubes and pipes | OD 1500 mm max, bored or trepanned | Hollow shafts, cylinders, nozzles |
| Single-piece weight | 5 kg to 20,000 kg | - |
| Delivery condition | Black forged, rough machined, finish machined | Machining allowance agreed per drawing |
Confirm the exact envelope for your part at enquiry stage. What is achievable depends on the combination of diameter, wall, height and weight rather than on any single dimension.
08Where 2.4630 forgings are used
2.4630 gets specified for hot components in oxidising atmospheres where stress is low to moderate and the part has to be welded or formed. Typical applications by sector:
Furnace fixtures and retorts
Muffles, trays, radiant tube supports and heat-treatment furnace components exposed to repeated thermal cycling.
Flanges, tube sheets, shells
Forged flanges and tube sheets for shell-and-tube heat exchangers, air receivers and pressure vessels.
Columns, towers, silos
Forged rings, flanges and pipes for columns, preheaters, process modules and crystalliser equipment.
Bodies, seat rings, stems
Forged bodies, blocks and valve seat rings for ball, gate, globe, check and plug valves in hot service.
Subsea and surface hardware
Bushings, sleeves and discs for wellhead and Christmas-tree assemblies, compressors and generator packages.
Boiler tube supports
Supports and structural forgings that need stable oxidation behaviour over long service intervals.
Valves, die-casting inserts
Exhaust-valve blanks, die-casting inserts and cores where thermal fatigue resistance is required.
Engine ancillary hardware
Welded rings, casings and formed sheet-metal assemblies. This was the original duty the alloy was developed for in the 1940s.
09Testing, inspection and certification
Every 2.4630 forging leaves Jiangyin with a material test certificate. The standard scope is below, and further tests go into the inspection and test plan on request.
| Test | Standard or method | Scope |
|---|---|---|
| Chemical analysis | Spectrometric, heat and product analysis | Standard |
| Tensile test, room temperature | ISO 6892-1 / ASTM A370 | Standard |
| Hardness | Brinell, ISO 6506 / ASTM E10 | Standard |
| Ultrasonic examination | EN 10228-3, SEP 1921, ASTM A388 | Standard |
| Dimensional inspection | To approved drawing | Standard |
| Tensile test, elevated temperature | ISO 6892-2 | On request |
| Impact test | ISO 148-1 / ASTM E23 | On request |
| Grain size and microstructure | ASTM E112 | On request |
| Intergranular corrosion | ASTM G28 method A | On request |
| Liquid penetrant, magnetic particle | EN 10228-1, EN 10228-2, ASTM E165 | On request |
| PMI verification | Portable XRF or OES | On request |
Documentation. Certificates are issued to EN 10204 3.1 as standard. Where third-party witness or release is required, we issue EN 10204 3.2 certificates through inspection bodies such as TUV, BV, SGS, DNV or Lloyd's Register. Name the body in the enquiry so witness points can be built into the schedule.
102.4630 compared with neighbouring grades
If 2.4630 is not right for the duty, one of these grades usually is. Worth checking the selection before you send the drawing.
| Grade | Type | Rm typical | Max. service | Choose it when |
|---|---|---|---|---|
| 2.4630 / Nimonic 75 | Solid solution Ni-Cr | 650-750 MPa | 1100 °C oxidation | Oxidation resistance, weldability and formability matter, and stress is low to moderate |
| Nimonic 80A | Precipitation hardened | 1000-1200 MPa | 815 °C stressed | You need real strength hot: bolting, blades, highly loaded rings |
| Inconel 600 | Solid solution Ni-Cr-Fe | 550-700 MPa | 1090 °C | Chloride stress-corrosion resistance and caustic service dominate |
| Incoloy 800H | Fe-Ni-Cr creep grade | 450-600 MPa | 1100 °C | Long-term creep rupture above 600 °C at lower alloy cost |
| Inconel 625 | Solid solution Ni-Cr-Mo-Nb | 830-1000 MPa | 980 °C | Aqueous and pitting corrosion resistance drives the choice, not just heat |
Values are typical for solution-annealed forged product and are shown for grade selection only. Confirm against the controlling specification before design.
Related nickel alloy forgings
11Frequently asked questions about 2.4630
What is material 2.4630?
2.4630 is the German material number (Werkstoffnummer) for NiCr20Ti, a solid-solution-strengthened nickel-chromium alloy containing about 75 % nickel and 18 to 21 % chromium with controlled titanium and carbon additions. The same base material is sold as Nimonic 75 and listed as UNS N06075. It is specified for hot parts that need oxidation resistance to 1100 °C and easy welding, rather than high creep strength.
Is 2.4630 the same as Nimonic 75?
Yes. 2.4630 (NiCr20Ti) and Nimonic 75 are the same 80/20 nickel-chromium alloy, also listed as UNS N06075. Some datasheets use the related number 2.4951 for the solution-annealed condition. Minor composition tolerances differ between the DIN, ISO and BS documents, so name the controlling specification on the purchase order.
What is the chemical composition of 2.4630?
Typical 2.4630 composition to DIN 17744 is nickel balance, chromium 18.00 to 21.00 %, titanium 0.20 to 0.60 %, carbon 0.08 to 0.15 %, iron max 5.00 %, manganese max 1.00 %, silicon max 1.00 %, copper max 0.50 % and aluminium max 0.30 %. Jiangyin Jiangnan Metal Co., Ltd. reports the heat analysis and product analysis on the EN 10204 3.1 certificate supplied with every forging.
What is the maximum service temperature of 2.4630?
2.4630 resists oxidation in air to about 1100 °C and keeps useful mechanical properties to roughly 1000 °C. Above about 815 °C under sustained stress, precipitation-hardened grades such as Nimonic 80A, Waspaloy or Alloy 263 are the better choice, because 2.4630 has no gamma-prime strengthening.
What is the forging temperature range for 2.4630?
2.4630 is hot forged between about 1050 °C and 1200 °C, and the finishing temperature is held above 950 °C to avoid strain cracking. Billet temperature must not exceed 1200 °C, or low-melting grain-boundary constituents can start to melt. A forging reduction ratio of at least 3 to 1 is recommended, followed by solution annealing at 1050 to 1080 °C and air cooling.
Who supplies 2.4630 forged rings, bars and discs from China?
Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, manufactures 2.4630 forged rings, seamless rolled rings, round bars, discs, flanges, shafts, sleeves, bushings, tube sheets and pipes to customer drawings. Enquiries go to sales@steelforgepieces.com or +86-189-2135-9659.
What sizes of 2.4630 forgings can be produced?
Jiangyin Jiangnan Metal produces 2.4630 forged bars from 80 mm to 1200 mm diameter, seamless rolled rings from 200 mm to 4000 mm outside diameter, discs to 2500 mm diameter, and single pieces from 5 kg to about 20,000 kg. Sizes outside this range can often be produced by agreement.
What testing and certification is supplied with 2.4630 forgings?
Standard scope covers chemical analysis, room-temperature tensile testing, hardness testing and ultrasonic examination to EN 10228-3, SEP 1921 or ASTM A388. Documents are issued as EN 10204 3.1, or EN 10204 3.2 where third-party witness is required. Elevated-temperature tensile, impact, grain size, intergranular corrosion and PMI testing can be added on request.
What is the lead time for 2.4630 forgings?
Lead time is normally 25 to 45 days from drawing approval. It depends on whether the required 2.4630 billet size is in stock, on the forging weight, and on how much machining and third-party inspection is involved. Confirm the current lead time with sales@steelforgepieces.com when you request a quotation.
Can 2.4630 be welded?
Yes. 2.4630 welds readily by MMA, TIG, MIG and submerged-arc processes, and is normally welded in the solution-annealed condition. Post-weld heat treatment is not usually needed, although a solution anneal at about 1050 °C is recommended if the component will run above 700 °C.
12Request a quotation for 2.4630 forgings
Send a drawing, or the dimensions and quantity, and we will come back with a price and lead time. Include the controlling specification, the delivery condition (black forged, rough machined or finish machined), the testing scope and any third-party witness requirement.
- Manufacturer
- Jiangyin Jiangnan Metal Co., Ltd.
- Works address
- No.1 Chengxiqiao Road, Zhouzhuang Town,
Jiangyin City, Jiangsu Province, China - Telephone, WhatsApp, WeChat
- +86-189-2135-9659
- sales@steelforgepieces.com