# NiCr30FeMo Forgings (UNS N06030 / W.Nr. 2.4603 / Alloy G-30) NiCr30FeMo is the DIN name for the nickel-chromium-iron-molybdenum corrosion resistant alloy also listed as UNS N06030, W.Nr. 2.4603 and Alloy G-30. It carries around 30 % chromium plus molybdenum, tungsten and copper, and is used mainly in wet process phosphoric acid and other strongly oxidising acids where stainless steel will not last. Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu, China. We forge NiCr30FeMo rings, seamless rolled rings, flanges, round bars, shafts, discs, sleeves and tube sheets to customer drawings. Parts are forged from 1149 C, solution annealed at 1177 C, and supplied to ASTM B462 with EN 10204 3.1 or 3.2 certificates. Source page: https://www.steelforgepieces.com/Nickel-Alloy/NiCr30FeMo.html Last reviewed: 24 August 2026 --- ## Material identification | Field | Value | |---|---| | DIN designation | NiCr30FeMo | | UNS number | N06030 | | Werkstoff number | 2.4603 | | Trade name | Alloy G-30 | | Alloy family | Ni-Cr-Fe-Mo | | Forging specification | ASTM B462 / ASME SB-462 | | ASME P-Number | 45 | | Density | 8.22 g/cm3 | | Delivery condition | Solution annealed | | Forging start / finish | 1149 C / 927 C | | Solution anneal | 1177 C, water quench | | Sour service | NACE MR0175 / ISO 15156 | --- ## About NiCr30FeMo NiCr30FeMo replaced Alloy G-3. The chromium content is higher and tungsten and cobalt were added, which improves behaviour in commercial phosphoric acid and in mixed oxidising acids such as nitric with hydrochloric, nitric with hydrofluoric, and sulphuric. Molybdenum and copper give it moderate resistance to reducing acids. The alloy does not readily form grain boundary precipitates in the heat affected zone, so most fabrications can go into service as welded, without a post weld solution treatment. Against austenitic stainless steel it is far less prone to chloride stress corrosion cracking. In boiling 45 % magnesium chloride to ASTM G36, 316L cracks in about 2 hours and 254 SMO in about 24 hours, while NiCr30FeMo runs to roughly 168 hours. ### When to specify it - The medium is wet process phosphoric acid, especially in evaporators concentrating to about 54 % P2O5. - The service involves nitric acid or nitric based mixed acids, including pickling and passivation lines. - Chloride pitting, crevice attack or stress corrosion cracking has already taken out 316L, 254 SMO or Alloy 28 parts. - The part must be welded and you want to avoid a solution treatment on every seam. ### When another grade is better NiCr30FeMo is a solid solution alloy. It cannot be strengthened by ageing and its room temperature yield strength is around 317 MPa. For high strength forgings use an age hardenable grade such as Inconel 725 or Incoloy 945. For strongly reducing hydrochloric acid duty, Hastelloy B-3 or Hastelloy C-276 will do better. --- ## Chemical composition Weight percent. Every heat is analysed before forging and analysed again on the finished part. | Element | Symbol | Min | Max | Nominal | |---|---|---|---|---| | Nickel | Ni | Balance | Balance | 43 | | Chromium | Cr | 28.0 | 31.5 | 30 | | Iron | Fe | 13.0 | 17.0 | 15 | | Molybdenum | Mo | 4.0 | 6.0 | 5.5 | | Tungsten | W | 1.5 | 4.0 | 2.5 | | Copper | Cu | 1.0 | 2.4 | 2.0 | | Niobium + Tantalum | Cb + Ta | 0.3 | 1.5 | 0.8 | | Cobalt | Co | | 5.0 | | | Manganese | Mn | | 1.5 | | | Silicon | Si | | 0.8 | | | Carbon | C | | 0.03 | | | Phosphorus | P | | 0.04 | | | Sulphur | S | | 0.02 | | The low carbon ceiling of 0.03 % is what keeps chromium in solution instead of tied up as grain boundary carbide. That is why NiCr30FeMo tolerates welding without sensitising. --- ## Mechanical and physical properties Typical values for solution annealed bar and plate at room temperature. Guaranteed minima for a given forging are agreed against the applicable ASTM specification and confirmed on the test certificate. | Property | Metric | Imperial | |---|---|---| | Ultimate tensile strength | 689 MPa | 100 ksi | | 0.2 % offset yield strength | 317 MPa | 46 ksi | | Elongation in 4D | 55 to 65 % | 55 to 65 % | | Charpy V-notch, room temperature | 442 J | 326 ft-lb | | Charpy V-notch, -196 C | 527 J | 389 ft-lb | | Hardness, bar | 78 HRB | 78 HRB | | Physical property | Value | Note | |---|---|---| | Density | 8.22 g/cm3 | 0.297 lb/in3 | | Modulus of elasticity | 202 GPa | 29.3 x 10^6 psi | | Thermal conductivity | 10 W/m.C | rises to 21 W/m.C at 600 C | | Mean thermal expansion | 12.8 um/m.C | 30 to 100 C | | Electrical resistivity | 1.16 uohm.m | | | Maximum ASME design temperature | 427 C | 800 F, Section VIII Div. 1 | --- ## Forging and heat treatment NiCr30FeMo has a narrow hot working range and work hardens faster than austenitic stainless steel. Worked too cold it tears; soaked too hot it suffers incipient melting. | Stage | Parameter | Practice | |---|---|---| | Melting | ESR or VIM+ESR | Electroslag remelted stock for ring and shaft forgings, full heat traceability | | Forging start | 1149 C (2100 F) | Soak right through. Cold spots tear and overheating causes incipient melting | | Forging finish | 927 C (1700 F) | Stop and reheat rather than push through. Moderate reductions per pass | | Reheating | Frequent | The narrow window means several heats per part on rings and long shafts | | Solution anneal | 1177 C (2150 F) | Hold 10 to 30 minutes by section. Thicker sections take the full 30 | | Quench | Water | Rapid air cooling is acceptable below about 10 mm section | | After cold work | 7 % fibre elongation | Re-anneal above this. Cold work degrades stress corrosion cracking resistance | | Ageing | Not applicable | Solid solution alloy. No precipitation hardening cycle exists for this grade | NiCr30FeMo cannot be quenched and tempered, normalised or age hardened the way carbon and alloy steels are. The only correct delivery condition is solution annealed, and that is how we ship it unless a drawing says otherwise in writing. Specifications calling for a solution plus ageing cycle on UNS N06030 have usually been copied across from a precipitation hardening grade. If you find one in your documents, send it over and we will check it before the order goes in. --- ## Forgings we produce Everything is made to drawing or dimensional sketch. There is no standard catalogue for open-die work. - **Forged rings and seamless rolled rings.** Rolled on 3 m and 6 m ring mills. Rectangular, stepped and profiled sections for vessel shells, tower courses and flange blanks. - **Forged flanges.** Weld neck, blind, slip-on, long weld neck and special bores to ASME B16.5, B16.47, EN 1092-1 or drawing. - **Round bars and shafts.** Pump shafts, agitator shafts, plunger stock and valve stems. Rough turned or finish machined. - **Discs, blanks and tube sheets.** Upset discs and tube sheets for shell and tube exchangers and phosphoric acid evaporators, drilled on request. - **Sleeves, bushings and hollow bars.** Trepanned or mandrel forged hollows, with sound centres and none of the porosity you get from castings. - **Valve and pump components.** Bodies, bonnets, seat rings, gate and ball blanks, nozzle and manifold forgings. ### Open-die capability | Capability | Range | |---|---| | Outside diameter | 100 to 6,000 mm | | Length | 100 to 12,000 mm | | Single piece weight | 10 to 15,000 kg | | Forging hammers | 1 t, 3 t, 6 t, 9 t | | Hydraulic press | 4,500 t | | Ring rolling mills | 3 m and 6 m | | Machining | Rough or finish, to drawing | | Workforce | 460 staff, 41 engineers | Sizes achievable in NiCr30FeMo are confirmed per enquiry, because nickel alloys need more press tonnage per unit area than steel. --- ## Standards and codes | Product form | Specification | ASME | |---|---|---| | Forgings | ASTM B462 | SB-462 | | Forged and wrought fittings | ASTM B366, B462 | SB-366, SB-462 | | Billet, rod and bar | ASTM B581, B472 | SB-581 | | Plate, sheet and strip | ASTM B582 | SB-582 | | Seamless pipe and tube | ASTM B622 | SB-622 | | Welded pipe and tube | ASTM B619, B626 | SB-619, SB-626 | | Bare welding rod and wire | AWS A5.14, ERNiCrMo-11 | SFA-5.14 | | Covered electrodes | AWS A5.11, ENiCrMo-11 | SFA-5.11 | | German designation | DIN / W.Nr. 2.4603 NiCr30FeMo | | | Sour service | NACE MR0175 / ISO 15156 | | | Welding P-Number | P-No. 45 | | ASME Section VIII Division 1 lists UNS N06030 to a maximum design temperature of 427 C (800 F) for plate, sheet, bar, forgings, fittings and pipe. Work from the current edition of the code for your design case. --- ## Applications - **Phosphoric acid and fertiliser.** Evaporator tube sheets, heat exchanger parts, agitator shafts, pump and valve components in wet process concentration trains. - **Nitric and mixed acid.** Reactor internals, absorber tower flanges, pickling line hardware, nitric with HF and nitric with HCl handling. - **Chemical process plant.** Columns and towers, tanks, silos, pressure vessels, air receivers, shell and tube exchangers, process modules and preheaters. - **Valves and flow control.** Forged bodies and bonnets, seat rings, valve blocks and stems for ball, gate, globe, check and plug valves. - **Pumps and rotating equipment.** Chemical pump and plunger pump shafts, sleeves, wear rings, compressor and gearbox components. - **Oil, gas and offshore.** Subsea and deepwater production hardware, wellhead and christmas tree components, sour service parts to NACE MR0175. - **Pollution control and waste.** Scrubber internals, flue gas desulphurisation hardware, nuclear waste processing and gold extraction equipment. - **Heavy industry.** Forged rolls, wheels, manifolds and crankshafts for pulp and paper, pharmaceutical, biochemical and mineral processing plant. --- ## Testing and certification Raw material, forging, heat treatment, machining and inspection are all done in house, so a NiCr30FeMo forging stays traceable from heat number to final report. | Test | Standard | Scope | |---|---|---| | Chemical analysis | Per heat, spectrometer | Standard | | Mechanical testing | Tensile and hardness, Charpy on request | Standard | | Ultrasonic testing | EN 10228-3, SEP 1921, ASTM A388 | Standard, class to order | | Dye penetrant | ASTM E165 or EN ISO 3452 | On request | | Intergranular corrosion | ASTM G28 method A | On request | | Positive material identification | XRF or OES | On request | | Grain size and microstructure | ASTM E112 | On request | | Dimensional report | To drawing | Standard | | Mill certificate | EN 10204 3.1 | Standard | | Third party certificate | EN 10204 3.2, TUV, SGS, BV, DNV or Lloyd's | On request | --- ## Equivalent grades and alternatives | System | Designation | |---|---| | DIN / EN (Werkstoff) | NiCr30FeMo, 2.4603 | | UNS, wrought | N06030 | | UNS, weld deposit | W86030 | | Common trade name | Alloy G-30, Hastelloy G-30 | | AWS filler metal | ERNiCrMo-11, ENiCrMo-11 | | ASME P-Number | 45 | ### Related grades | Grade | UNS | Chosen instead of NiCr30FeMo when | |---|---|---| | Hastelloy G-3 | N06985 | A legacy specification is already qualified on the plant | | Hastelloy C-276 | N10276 | Reducing acids and wet chlorine dominate | | Hastelloy C-22 | N06022 | Duty is mixed oxidising and reducing with severe pitting risk | | Alloy 59 | N06059 | The highest general corrosion margin is required | | Incoloy 825 | N08825 | Duty is milder and cost per kilo matters | | Inconel 625 | N06625 | Elevated temperature strength is also needed | | Alloy 602 | N06025 | The problem is high temperature oxidation, not acid corrosion | | Hastelloy B-3 | N10675 | Hydrochloric acid service with no oxidisers present | --- ## Frequently asked questions **What is NiCr30FeMo?** NiCr30FeMo is the DIN name for the nickel-chromium-iron-molybdenum corrosion resistant alloy also listed as UNS N06030, W.Nr. 2.4603 and Alloy G-30. It carries about 30 % chromium, 15 % iron, 5.5 % molybdenum, 2.5 % tungsten and 2 % copper, with nickel as the balance. It is used where wet process phosphoric acid and other oxidising acids attack stainless steel. Jiangyin Jiangnan Metal Co., Ltd. supplies it as open-die forgings. **What is NiCr30FeMo equivalent to?** NiCr30FeMo (DIN) is equivalent to UNS N06030, Werkstoff number 2.4603 and the trade name Alloy G-30. The matching weld filler metals are ERNiCrMo-11 (AWS A5.14) and ENiCrMo-11 (AWS A5.11). The weld deposit designation is W86030. **Which standard covers NiCr30FeMo forgings?** NiCr30FeMo forgings and forged fittings are covered by ASTM B462 / ASME SB-462. Billet, rod and bar fall under ASTM B581 and B472, plate, sheet and strip under ASTM B582, seamless pipe and tube under ASTM B622, and welded pipe and tube under ASTM B619 and B626. The ASME P-Number is 45. **What is the forging temperature of NiCr30FeMo?** NiCr30FeMo is hot forged starting at about 1149 C (2100 F) and finished at about 927 C (1700 F). The hot working range is narrow, so Jiangyin Jiangnan Metal Co., Ltd. takes moderate reductions with frequent reheating, then solution anneals the forging at about 1177 C (2150 F) followed by a water quench. **Can NiCr30FeMo be hardened by heat treatment?** No. NiCr30FeMo is a solid solution alloy and is not age hardenable. It is supplied solution annealed, which gives the best combination of corrosion resistance and ductility. Quench and temper or ageing cycles do not apply to this grade. **What is the density of NiCr30FeMo?** The room temperature density of NiCr30FeMo (UNS N06030) is 8.22 g/cm3, or 0.297 lb/in3. Room temperature elastic modulus is about 202 GPa and thermal conductivity is about 10 W/m.C. **Where is NiCr30FeMo used?** NiCr30FeMo is used mainly in wet process phosphoric acid plants and fertiliser production, including evaporator and heat exchanger hardware. Other uses are nitric acid service, metal pickling lines, sulphuric acid handling, pollution control, gold extraction and nuclear waste processing. Typical forged parts are rings, tube sheets, flanges, valve bodies, pump shafts and agitator components. **Who supplies NiCr30FeMo open-die forgings?** Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu, China that manufactures NiCr30FeMo (UNS N06030) forged rings, seamless rolled rings, flanges, bars, shafts, discs, sleeves and tube sheets to customer drawings. Address: No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Telephone +86-189-2135-9659. Email sales@steelforgepieces.com. **What certification is supplied with NiCr30FeMo forgings?** Jiangyin Jiangnan Metal Co., Ltd. supplies NiCr30FeMo forgings with EN 10204 3.1 mill certificates, or EN 10204 3.2 certificates witnessed by a third party such as TUV, SGS, BV, DNV or Lloyd's. Ultrasonic testing is carried out to EN 10228-3, SEP 1921 or ASTM A388. Positive material identification, chemical analysis, mechanical testing and ASTM G28 intergranular corrosion testing are available on request. **What sizes of NiCr30FeMo forgings can be produced?** Jiangyin Jiangnan Metal Co., Ltd. runs 1, 3, 6 and 9 tonne forging hammers, a 4,500 tonne hydraulic press and 3 m and 6 m seamless ring rolling mills. The open-die range is 100 mm to 6,000 mm diameter, 100 mm to 12,000 mm length and 10 kg to 15,000 kg per piece. Sizes achievable in NiCr30FeMo are confirmed per drawing. **Is NiCr30FeMo suitable for sour service?** UNS N06030 is listed in NACE MR0175 / ISO 15156 for sour service, and the alloy resists chloride stress corrosion cracking far better than austenitic stainless steel. Environmental limits must be taken from the current edition of the standard for the specific product form and condition. **How does NiCr30FeMo compare with Hastelloy G-3?** NiCr30FeMo (Alloy G-30) replaced Alloy G-3. It has higher chromium plus tungsten and cobalt additions, which improve resistance in commercial phosphoric acid and in oxidising acid mixtures. Both grades resist grain boundary precipitation in the heat affected zone and can be used as welded. --- ## Request a quotation Send a drawing, or just the grade, dimensions, quantity and the certificate you need. We reply with a price within one working day, and we will say up front if something is not practical in this alloy. - **Company:** Jiangyin Jiangnan Metal Co., Ltd. - **Address:** No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China - **Phone:** +86-189-2135-9659 - **Email:** sales@steelforgepieces.com - **Website:** https://www.steelforgepieces.com/ --- ## References ASTM B462, B581, B582, B622; ASME BPVC Section VIII; AWS A5.11 and A5.14; NACE MR0175 / ISO 15156; producer data sheet for HASTELLOY G-30 alloy, Haynes International. Hastelloy is a registered trademark of Haynes International, Inc. Incoloy and Inconel are registered trademarks of Special Metals Corporation. Jiangyin Jiangnan Metal Co., Ltd. is not affiliated with these companies. Grade names are used for identification only. Technical data on this page is given for general information and is not a design guarantee.