# 1.4980 / X6NiCrTiMoVB25-15-2 Forgings **Supplier:** Jiangyin Jiangnan Metal Co., Ltd. (Open-Die Forging Factory) **Address:** No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China **Phone:** 0086-189-2135-9659 | **Email:** sales@steelforgepieces.com **Page:** https://www.steelforgepieces.com/Nickel-Alloy/1.4980.html **Published:** 2022-05-12 | **Last updated:** 2026-08-07 --- ## 1.4980 at a glance | Item | Value | |---|---| | EN material | 1.4980, X6NiCrTiMoVB25-15-2 | | Alloy type | Iron-nickel-chromium austenitic precipitation-hardening superalloy, non-magnetic | | Same alloy as | A286, UNS S66286, Alloy 660, ASTM A638 Type 660, JIS SUH 660 | | Standards | EN 10269, EN 10302, VdTUV-Werkstoffblatt 435, AD 2000 W2 and W10, NACE MR0175 / ISO 15156 | | Composition | Ni 24-27, Cr 13.5-16, Ti 1.90-2.30, Mo 1.0-1.5, V 0.10-0.50, B 0.0030-0.010, Fe balance | | Condition | +AT+P: solution annealed 900-980 C with oil quench, aged 720 C for 16 h, air cooled | | Strength | Rm 900-1150 MPa, Rp0,2 min 600 MPa, A min 15 %, KV min 50 J | | Service limit | About 700 C. Rp0,2 is still 380 MPa minimum at that temperature. | | Forged forms | Seamless rolled rings, discs, shafts, round and hex bar, flanges, sleeves, bushings, tube sheets, valve parts, custom near-net shapes | | Size envelope | Rings to 1,800 mm OD, discs to 1,500 mm dia, shafts to 6 m, bar 25-400 mm dia, max 5,000 kg per piece | | Certification | EN 10204 3.1 standard, EN 10204 3.2 witnessed on request, ISO 9001:2015 | | Lead time | Stocked sizes 4-6 weeks, custom forgings 8-14 weeks | --- ## 1. What is 1.4980 / X6NiCrTiMoVB25-15-2? 1.4980 is the European material number for an iron-nickel-chromium, austenitic, precipitation-hardening superalloy. Its full EN chemical name is X6NiCrTiMoVB25-15-2, which reads as approximately 0.06 % carbon, 25 % nickel, 15 % chromium and 2 % titanium, with additions of molybdenum, vanadium and boron and iron making up the balance at about 52 to 53 %. The alloy strengthens by ageing rather than by cold work or martensite formation. During a 16-hour hold at 720 C, titanium and aluminium combine with nickel to precipitate a coherent, ordered gamma prime Ni3(Ti,Al) phase about 20 to 30 nm across throughout the austenitic matrix. Dislocations have to cut through these particles rather than glide past them, which raises tensile strength to roughly 1,000 MPa and preserves a useful fraction of that strength at temperatures where conventional stainless grades have softened. Standard austenitic grades such as 304 and 316 lose most of their useful design strength above about 550 C. Martensitic precipitation-hardening stainless steels such as 17-4 PH and PH 13-8 Mo are stronger at room temperature but are limited to about 315 C. Nickel-based superalloys such as Inconel 625 operate far higher but cost several times more. 1.4980 covers the range between them: it is serviceable to about 700 C at roughly a third of the cost of a nickel-based alloy. 1.4980 is fully austenitic and stays non-magnetic in every condition, including after cold work. It retains good ductility and toughness at cryogenic temperature, so the same alloy is used in liquid hydrogen and liquid oxygen service as well as in hot turbine sections. --- ## 2. 1.4980 equivalents: A286, SUH 660 and Alloy 660 1.4980, A286, UNS S66286, Alloy 660, ASTM A638 Type 660 and JIS SUH 660 all describe one alloy. The main alloying elements were harmonised by international agreement. The standards differ in trace-element control, where 1.4980 is the strictest: tightest sulphur limit at 0.015 % maximum, and the only one specifying a minimum boron content. | Region / body | Designation | Governing standard | |---|---|---| | Europe, EN / DIN | **1.4980**, X6NiCrTiMoVB25-15-2 | EN 10269 (fasteners), EN 10302 (creep-resisting alloys) | | USA, UNS | S66286 | Unified Numbering System | | USA, common name | A286, A-286, Alloy 660 | Original NACA / Allegheny Ludlum designation, generic, not a trademark | | USA, ASTM | A638 Type 660, A453 Grade 660 | Bars and forgings; bolting for pressure service | | USA, AMS | 5731, 5732, 5734, 5737, 5853 | Aerospace specifications, same chemistry | | Japan, JIS | SUH 660 | JIS G 4901, heat-resisting steel bars | | Germany, legacy DIN | X5 NiCrTi 26-15 | Superseded by 1.4980 | | France, AFNOR legacy | Z6 NCT 25, Z5 NCTDV 26-15 B | Superseded by EN 1.4980 | | UK, BS legacy | HR 1810, BS S151 / S152 | Superseded by EN 1.4980 | | Europe, related EN | 1.4943, 1.4944 | Comparable chemistries, not automatically interchangeable | | Trade names | Incoloy A-286, Pyromet A-286, Tinidur | Proprietary names for the same chemistry | ### Trace-element controls compared | Element | 1.4980 (EN 10269 / 10302) | UNS S66286 (AMS 5732 / A638) | SUH 660 (JIS G 4901) | |---|---|---|---| | Phosphorus P | max 0.025 | max 0.025 | max 0.040 | | Sulphur S | max 0.015 (tightest) | max 0.025 | max 0.030 | | Boron B | 0.0030-0.010 (min specified) | 0.001-0.010 | 0.001-0.010 | | Titanium Ti | 1.90-2.30 | 1.90-2.35 | 1.90-2.35 | | Copper Cu | not specified | max 0.50 | not specified | European 1.4980 releases run reliably higher in boron than AMS or JIS material, which improves grain-boundary creep resistance at some cost in forgeability. When cross-certifying AMS 5732 material against a 1.4980 callout, specify boron at the upper end of the AMS range. --- ## 3. Which European standards govern 1.4980? | Standard | Scope | |---|---| | EN 10269 | Steels and nickel alloys for fasteners with specified elevated and low temperature properties. Source of the mechanical minimums below. | | EN 10302 | Creep-resisting steels, nickel and cobalt alloys. Structural components under sustained load at temperature. | | EN 10204 | Metallic products, types of inspection documents. Determines 3.1 vs 3.2 certificate. | | VdTUV-Wbl. 435 | German material data sheet for the grade | | AD 2000 W2 / W10 | Austenitic steels, materials for low temperatures. German pressure-vessel construction. | | PED 2014/68/EU | Pressure Equipment Directive | | TRD 100 / 106 | Technical rules for steam boilers | | NACE MR0175 / ISO 15156 | Materials for H2S-containing oil and gas environments | | EN 10228-3, SEP 1921 | Ultrasonic testing of forgings | --- ## 4. 1.4980 chemical composition (EN 10269, weight %) | Element | Min | Max | Role | |---|---|---|---| | Carbon C | 0.03 | 0.08 | Solid-solution strength, held low to limit carbide networks | | Silicon Si | - | 1.00 | Deoxidiser | | Manganese Mn | - | 2.00 | Austenite stabiliser and deoxidiser | | Phosphorus P | - | 0.025 | Residual, segregates to grain boundaries | | Sulphur S | - | 0.015 | Residual, tightest limit of any A286-type standard | | Chromium Cr | 13.50 | 16.00 | Oxidation and corrosion resistance | | Nickel Ni | 24.00 | 27.00 | Austenite stabiliser, supplies nickel for gamma prime | | Molybdenum Mo | 1.00 | 1.50 | Solid-solution strengthening, creep resistance | | Titanium Ti | 1.90 | 2.30 | Primary gamma prime former, main strengthening element | | Aluminium Al | - | 0.35 | Co-former in gamma prime Ni3(Ti,Al) | | Vanadium V | 0.10 | 0.50 | Additional strength contribution | | Boron B | 0.0030 | 0.010 | Grain-boundary strengthening, governs creep life | | Iron Fe | Balance, approx. 52-53 | | Matrix | **Boron.** Present at only 30 to 100 ppm but it controls creep behaviour. It segregates to grain boundaries and slows the boundary sliding that dominates deformation at 600 C and above. EN 10269 is the only A286-family standard specifying a minimum boron level. **Melting route.** Titanium at 2 % and boron at ppm levels are oxygen-sensitive. Melted in air, titanium forms TiO2 inclusion stringers that fail ultrasonic inspection at the billet stage. Jiangyin Jiangnan Metal Co., Ltd. melts 1.4980 under vacuum: VIM for standard European supply, VIM-VAR double melt for critical rotating parts. --- ## 5. Mechanical properties, +AT+P condition | Property | EN 10269 minimum (d up to 160 mm) | Typical production (aged) | Solution annealed only (+AT) | |---|---|---|---| | Tensile strength Rm | 900-1150 MPa | approx. 1,050 MPa | approx. 620 MPa | | Proof strength Rp0,2 | min 600 MPa | approx. 670 MPa | approx. 250 MPa | | Elongation A (5d) | min 15 % | approx. 23 % | approx. 40 % | | Reduction of area Z | not specified | approx. 40 % | approx. 55 % | | Impact energy KV (ISO-V, 20 C) | min 50 J | approx. 60 J | approx. 120 J | | Hardness | - | 248-341 HBW, approx. 30 HRC | approx. 85 HRB | | Modulus of elasticity E | approx. 201 GPa at 20 C | | | **Section size.** The values above are the EN 10269 table for diameters up to 160 mm. Heavier sections and components supplied under EN 10302 or VdTUV 435 carry different acceptance values, because the quench rate at the core of a thick forging is slower. **Ordering in the +AT condition.** Where the forging will be heavily machined, order it solution annealed only, machine it at 250 MPa proof strength and 40 % elongation, then age the finished part at 720 C. Machining aged 1.4980 is about three times slower than machining it annealed. --- ## 6. Strength at elevated temperature (EN 10269, +AT+P, d up to 160 mm) | Temperature | Rp0,2 min (MPa) | % of 20 C value | |---|---|---| | 20 C | 600 | 100 % | | 100 C | 592 | 99 % | | 150 C | 580 | 97 % | | 200 C | 570 | 95 % | | 250 C | 560 | 93 % | | 300 C | 550 | 92 % | | 350 C | 540 | 90 % | | 400 C | 530 | 88 % | | 450 C | 520 | 87 % | | 500 C | 510 | 85 % | | 550 C | 490 | 82 % | | 600 C | 460 | 77 % | | 650 C | 430 | 72 % | | 700 C | 380 | 63 % | **Service above 700 C.** The gamma prime precipitates undergo Ostwald ripening: large particles grow at the expense of small ones, inter-particle spacing widens, and dislocations begin bowing around the precipitates instead of cutting through them. Shear strength drops and does not recover on cooling. For sustained structural service above 700 C, use Inconel 625, Waspaloy (to about 760 C) or Hastelloy X. Above about 600 C, proof strength is no longer the governing number. Time-dependent creep and stress-rupture allowables take over. Use the EN 10302 creep-rupture tables for the design life. --- ## 7. Physical properties | Property | Value | Unit | Condition | |---|---|---|---| | Density | 7.94 | g/cm3 | Aged, 20 C (0.287 lb/in3) | | Modulus of elasticity E | 201 | GPa | 20 C | | Shear modulus G | 78 | GPa | 20 C | | Poisson's ratio | 0.31 | - | 20 C | | Thermal expansion | 16.5 / 17.6 / 18.4 | 10^-6 /K | 20-100 / 20-540 / 20-760 C | | Thermal conductivity | approx. 12.5 | W/(m.K) | 20 C | | Specific heat capacity | 460 | J/(kg.K) | 20 C | | Electrical resistivity | 0.91 | micro-ohm.m | 20 C | | Magnetic permeability | approx. 1.005 | - | Non-magnetic in every condition | | Melting range | 1370-1400 | C | Solidus to liquidus | Thermal conductivity of 12.5 W/(m.K) is about a quarter that of carbon steel, so heavy 1.4980 sections need longer soak times to reach temperature uniformly. The expansion coefficient of 16.5 x 10^-6 /K is higher than most ferritic bolting materials, which matters when 1.4980 fasteners clamp a ferritic flange through a thermal cycle. --- ## 8. Heat treatment: the +AT+P cycle 1.4980 is supplied solution annealed at 900 to 980 C for one to two hours and oil quenched, then precipitation hardened at 720 C for 16 hours and air cooled. **Stage 1, solution annealing at 900 to 980 C.** Dissolves existing precipitates and returns titanium and aluminium to supersaturated solution. Soak time is one hour minimum plus about 30 minutes per 25 mm of ruling section. A higher solution temperature near 980 C gives better creep resistance and high-temperature strength. A lower solution temperature near 900 C gives better notch ductility and room-temperature toughness. **Stage 2, oil quench and transfer time.** Between the solution furnace and the quench tank the part passes through the band from about 760 C down to 700 C. If it remains there for more than about 45 seconds, hexagonal eta-phase Ni3Ti precipitates as a continuous film along the prior austenite grain boundaries. Eta-phase embrittles the boundaries, reduces low-cycle fatigue life by about 40 to 60 %, and causes strain-age cracking during any subsequent welding or stress relief. Once formed it cannot be removed without re-melting the part. Our furnace-to-quench shuttle is interlocked to fail safe under 25 seconds. Quench medium is fast oil at a controlled 55 to 65 C. Water is not used, since it cracks 1.4980 sections. **Stage 3, precipitation hardening at 720 C for 16 hours.** Shorter ageing leaves the gamma prime precipitates under-developed and the alloy below its proof-strength minimum. Longer ageing over-ages them: at 24 hours the particles have coarsened from about 22 nm to 60 to 80 nm and tensile strength falls by around 10 to 12 %. We hold 720 +/- 3 C for 16 h +/- 15 min, counted from the point at which the coldest thermocouple in the load reaches 715 C. --- ## 9. Forged products supplied Jiangyin Jiangnan Metal Co., Ltd. produces 1.4980 as open-die and ring-rolled forgings only. - **Seamless rolled rings.** OD 200-1,800 mm. Rectangular, contoured and T-section profiles for turbine casings, combustor mounting flanges and bearing races. - **Forged discs and hubs.** Diameter 150-1,500 mm. Upset and drawn to a minimum 4:1 forge ratio with grain flow wrapped around the bore, macro-etch inspected before dispatch. - **Round and hex bar.** Diameter 25-400 mm. EN 10269 fastener stock forged to a minimum 6:1 reduction for cold heading and machining into high-temperature bolts, studs, nuts and retainers. - **Forged shafts and spindles.** Length to 6 m. Stepped and eccentric shafts with continuous axial grain flow. UT to EN 10228-3. - **Flanges and valve parts.** Forged flanges, valve bodies, seat rings, stems, plugs and blocks. NACE MR0175 / ISO 15156 scope on request. - **Sleeves, bushings and tube sheets.** Forged and bored hollow sections for heat exchangers, shell-and-tube vessels, air receivers and pressure equipment under PED 2014/68/EU. - Also forged pipes and tubes, forged blocks and blanks, gears and gear blanks, forged nozzles, eccentric shafts, extrusion die rings and liners, forged wheels and rolls, and custom near-net-shape forgings to drawing. --- ## 10. Manufacturing capability | Item | Value | |---|---| | Max ring OD | 1,800 mm, seamless rolled | | Max disc diameter | 1,500 mm | | Max shaft length | 6 m | | Max piece weight | 5,000 kg | | Bar diameter | 25-400 mm, round or hex | | Min forge ratio | 4:1 (6:1 for bar stock) | **Forging window.** 1.4980 is forged between 1,175 C and 1,010 C. Above 1,175 C there is a risk of incipient melting at the grain boundaries. Below about 1,010 C the alloy work-hardens fast enough to tear at the surface. In production we pre-heat to 1,150 C, soak for 60 minutes plus 1.5 minutes per millimetre of section, and take two or three reheats at 1,120 C, without letting the piece fall below 950 C while under the hammer. **Melting route.** VIM single melt with working vacuum below 1 x 10^-3 mbar before titanium and aluminium are charged, suitable for most European industrial, pressure-equipment and valve applications. VIM-VAR double melt where inclusion clusters above about 50 micrometres would initiate low-cycle fatigue cracks. Every heat is sampled three times by OES at pre-tap, mid-pour and top-of-ingot. --- ## 11. Certification, testing and inspection Every 1.4980 forging shipped by Jiangyin Jiangnan Metal Co., Ltd. carries an EN 10204 3.1 mill certificate covering melt chemistry, mechanical test results, heat-treatment record, dimensional report and single-heat traceability. EN 10204 3.2 third-party witnessed certification is available on request through a client-nominated inspection body. | Test | Standard | |---|---| | Chemical analysis | OES, three samples per heat plus finished-part confirmation | | Tensile test | EN ISO 6892-1 | | Impact test | EN ISO 148-1, ISO-V | | Hardness | EN ISO 6506, Brinell HBW 10/3000 | | Ultrasonic testing | EN 10228-3, SEP 1921, ASTM A388 | | Dye penetrant | EN ISO 3452, ASTM E165 | | Grain size | ASTM E112, target band ASTM 4 to 7 | | Macro-etch and grain flow | ASTM E381, every disc and ring forging | | Stress rupture | EN ISO 204, supplementary requirement | | Intergranular corrosion | EN ISO 3651, supplementary requirement | **Certification scope.** The company holds ISO 9001:2015 as its standing quality-management certification. AS9100, NADCAP and tier-one aerospace OEM source approvals are not held as standing certifications; where a project requires them we work with the customer on a per-project basis. EN 10204 3.2 certificates are issued through client-nominated independent inspection bodies such as TUV, DNV, Bureau Veritas, Lloyd's Register, ABS or SGS. --- ## 12. Welding, machining and fabrication **Welding.** 1.4980 is weldable by GTAW, GMAW, electron-beam and laser processes with a matching filler. Weld in the solution-annealed condition rather than the aged condition, then solution treat and age the completed assembly. The controlling risk is strain-age cracking in highly restrained joints, where gamma prime precipitation during a post-weld thermal cycle coincides with residual stress relaxation. Controlled heating and cooling rates through the 600 to 800 C window are required. Preheat is not normally needed. A post-weld stress relief near 870 C is recommended for restrained joints. **Machining.** In the aged condition 1.4980 machines at roughly 30 to 40 % of the rate of Type 304. Use rigid setups with minimum overhang, sharp positive-rake carbide tooling, heavy positive feeds at 25 to 40 m/min for turning, and generous flood coolant. Do not dwell in the cut. **Hot working.** Between 1,175 C and 1,010 C, cool slowly from forging temperature, then solution treat and age. Cold forming is practical only in the solution-annealed condition. --- ## 13. 1.4980 compared with other forging alloys | Property | 1.4980 (aged) | Inconel 718 | Waspaloy | 17-4 PH H1025 | 316L | |---|---|---|---|---|---| | Base and class | Iron-based PH | Nickel-based PH | Nickel-based PH | Martensitic PH | Austenitic | | Rm at 20 C | approx. 1,000 MPa | approx. 1,275 MPa | approx. 1,275 MPa | approx. 1,070 MPa | approx. 515 MPa | | Rp0,2 at 20 C | approx. 660 MPa | approx. 1,035 MPa | approx. 825 MPa | approx. 1,000 MPa | approx. 205 MPa | | Max service temp | approx. 700 C | approx. 650 C | approx. 760 C | approx. 315 C | low strength above 550 C | | Density (g/cm3) | 7.94 | 8.19 | 8.19 | 7.75 | 7.99 | | Magnetic | No | No | No | Yes | No | | Cryogenic toughness | Excellent | Excellent | Good | Limited | Excellent | | Weldability | Good, strain-age caution | Good, post-weld age | Difficult | Moderate, PWHT | Excellent | | Relative cost | 3x | 8x | 10x | 2x | 1x baseline | **Russian and CIS drawings.** KhN35VTYu (EI787) is not a 1.4980 equivalent. It carries much higher nickel at 33 to 37 %, a deliberate tungsten addition of 2.5 to 3.5 % that 1.4980 does not contain, and much higher aluminium. Western certification bodies will not accept it against a 1.4980 callout without an explicit waiver. Functionally it sits closer to Inconel 718. --- ## 14. Applications - High-temperature bolting and fasteners: turbine casing bolts, manifold studs, exhaust fasteners - Gas turbine compressor discs and rings for aero-derivative and industrial gas turbines below 700 C - Steam turbine valve stems, spindles, blade roots and fasteners under AD 2000 and TRD scope - Pressure equipment: forged flanges, tube sheets, sleeves and shell components under PED 2014/68/EU - Offshore and subsea oil and gas: wellhead and Christmas-tree components, tubing hangers, completion tools, with NACE MR0175 / ISO 15156 scope for sour service - Valves: bodies, seat rings, stems, plugs and blocks for high-temperature process duty - Industrial furnaces and heat-treating equipment operating continuously at 600 to 700 C - Cryogenic structural fittings and turbopump components - Power transmission: gears, spindles, shafts and gearbox components - Extrusion tooling: die rings and container liners for hot aluminium and copper extrusion presses --- ## 15. How to specify a 1.4980 forging order 1. **Designation and governing standard.** State 1.4980 / X6NiCrTiMoVB25-15-2 and the standard with its revision: EN 10269, EN 10302 or VdTUV-Werkstoffblatt 435. If working from a legacy drawing marked Z6 NCT 25, HR 1810, BS S151 or X5 NiCrTi 26-15, say so. 2. **Delivery condition.** +AT+P for solution annealed and precipitation hardened, or +AT for solution annealed only if machining or forming before ageing. 3. **Melting route.** AOD, VIM single melt, or VIM-VAR double melt. Largest single factor in price and lead time. 4. **Drawing, tolerances and forge ratio.** 2D drawing or 3D model with dimensions, tolerances, machining allowance, surface finish, and any minimum forge-ratio or grain-flow requirement. 5. **Non-destructive examination.** Ultrasonic acceptance standard and class: EN 10228-3, SEP 1921 or ASTM A388, plus any dye-penetrant, grain-size or macro-etch requirement. 6. **Inspection certificate.** EN 10204 3.1 or EN 10204 3.2, naming the inspection body for 3.2. 7. **Quantity, Incoterms and destination.** Quantity, required delivery date, Incoterms (EXW Jiangyin, FOB Shanghai, CIF or DDP) and destination port or city. --- ## 16. Glossary - **1.4980**: EN material number for the iron-nickel-chromium precipitation-hardening superalloy X6NiCrTiMoVB25-15-2, the European designation of A286 / UNS S66286. - **X6NiCrTiMoVB25-15-2**: The EN chemical name of material 1.4980. - **+AT**: EN delivery-condition code for solution annealed. Approximately 250 MPa proof strength and 40 % elongation. - **+AT+P**: Solution annealed followed by precipitation hardened. Standard supply condition. - **Gamma prime**: The ordered Ni3(Ti,Al) precipitate formed during ageing at 720 C, approximately 20 to 30 nm across. - **Eta phase**: Hexagonal Ni3Ti that precipitates on grain boundaries if a solution-treated part cools too slowly through approximately 760 to 700 C. - **Strain-age cracking**: Intergranular cracking when a post-weld thermal cycle causes precipitation and stress relaxation simultaneously in a restrained joint. - **EN 10269**: European standard for steels and nickel alloys for fasteners with specified elevated and low temperature properties. - **EN 10302**: European standard for creep-resisting steels, nickel and cobalt alloys. - **EN 10204 3.1**: Inspection certificate issued by the manufacturer's own independent inspection department, with actual test results. - **EN 10204 3.2**: Inspection certificate countersigned by an independent inspection body who witnesses the tests. - **VIM**: Vacuum induction melting. - **VAR**: Vacuum arc remelting. - **Forge ratio**: Ratio of starting cross-section to finished cross-section. - **Ruling section**: The greatest thickness through which the part has to be quenched. --- ## 17. Frequently asked questions **Is 1.4980 the same material as A286?** Yes. 1.4980 (X6NiCrTiMoVB25-15-2) is the European EN and DIN designation for the same iron-nickel-chromium precipitation-hardening superalloy that the United States calls A286 or UNS S66286, that ASTM covers as A638 Type 660, and that Japan calls SUH 660. The differences are in trace-element control: 1.4980 carries the tightest sulphur limit at 0.015 % maximum and is the only one specifying a minimum boron content of 0.0030 %. **What is the chemical composition of 1.4980?** Per EN 10269: C 0.03-0.08, Si max 1.00, Mn max 2.00, P max 0.025, S max 0.015, Cr 13.5-16.0, Ni 24.0-27.0, Mo 1.00-1.50, Ti 1.90-2.30, Al max 0.35, V 0.10-0.50, B 0.0030-0.010, Fe balance at approximately 52 to 53 %. **What are the mechanical properties of 1.4980 in the +AT+P condition?** For material up to 160 mm diameter, EN 10269 requires Rp0,2 min 600 MPa, Rm 900-1150 MPa, elongation min 15 % and ISO-V impact energy min 50 J at room temperature. Production material typically runs near 1,050 MPa tensile and 670 MPa proof strength. **What is the maximum service temperature of 1.4980?** Approximately 700 C. EN 10269 tabulates Rp0,2 min 380 MPa at 700 C, falling from 592 MPa at 100 C. Above 700 C the gamma prime precipitates coarsen and the strength loss is permanent. **How is 1.4980 heat treated?** Solution anneal at 900 to 980 C for one to two hours, oil quench, then age at 720 C for 16 hours and air cool. The furnace-to-quench transfer has to be completed in under about 30 seconds. **Which European standards cover 1.4980?** EN 10269 and EN 10302 are the two principal standards. German pressure-equipment scope also references VdTUV-Werkstoffblatt 435, AD 2000 Merkblatt W2 and W10, and TRD 100 and TRD 106. Sour service references NACE MR0175 and ISO 15156. **What forged shapes are available in 1.4980?** Seamless rolled rings to 1,800 mm OD, forged discs to 1,500 mm diameter, shafts to 6 m, round and hex bar 25 to 400 mm diameter, flanges, sleeves, bushings, tube sheets, valve bodies and stems, forged pipes and tubes, gears, extrusion die rings, and custom near-net-shape forgings. Maximum single-piece weight 5,000 kg. **Can 1.4980 be welded?** Yes, by GTAW, GMAW, electron-beam and laser processes with a matching filler. Weld solution annealed rather than aged. The controlling risk is strain-age cracking in highly restrained joints. **What are the legacy European designations for 1.4980?** French AFNOR Z6 NCT 25 and Z5 NCTDV 26-15 B, British HR 1810 and BS S151 / S152, and the older German X5 NiCrTi 26-15, all superseded by EN 1.4980. **What certification is supplied with 1.4980 forgings?** EN 10204 3.1 mill certification is standard on every shipment. EN 10204 3.2 third-party witnessed certification is available on request through a client-nominated inspection body. The company holds ISO 9001:2015. **What is the lead time for 1.4980 forgings?** Stocked sizes 4 to 6 weeks. Custom open-die forgings 8 to 14 weeks. VIM-VAR double-melted material with full third-party witnessed certification, 12 to 16 weeks. **How does 1.4980 compare with Inconel 718?** 1.4980 is iron-based with approximately 25 % nickel; Inconel 718 is nickel-based with approximately 52 %. Inconel 718 reaches about 1,275 MPa tensile against roughly 1,000 MPa for 1.4980, at two to three times the cost. **Why is 1.4980 listed sometimes under nickel alloys and sometimes under stainless steel?** With iron as the balance at roughly 52 to 53 % it is formally an iron-based superalloy, placing it among the precipitation-hardening stainless steels in EN 10088 terms. Its 25 % nickel content, gamma prime strengthening mechanism and 700 C service capability place it functionally with the nickel superalloys. Both classifications are correct. --- ## Contact **Jiangyin Jiangnan Metal Co., Ltd.** (Open-Die Forging Factory) No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China Phone: 0086-189-2135-9659 | WhatsApp: https://wa.me/8618921359659 Email: sales@steelforgepieces.com Website: https://www.steelforgepieces.com/ Related pages: - A286 / UNS S66286 forgings (US standards): https://www.steelforgepieces.com/Stainless-Steel/A286.html - Nickel alloy forgings: https://www.steelforgepieces.com/Nickel-Alloy/ - Stainless steel forgings: https://www.steelforgepieces.com/Stainless-Steel/ --- **Designation notice.** 1.4980, X6NiCrTiMoVB25-15-2, A286, UNS S66286, Alloy 660, ASTM A638 Type 660 and JIS SUH 660 are generic public designations and not trademarks. Incoloy, Inconel and Nimonic are registered trademarks of Special Metals Corporation (PCC). Waspaloy is a registered trademark of United Technologies Corporation / PCC. Hastelloy is a registered trademark of Haynes International, Inc. Pyromet is a registered trademark of Carpenter Technology Corporation. **Technical data disclaimer.** Property values are taken from the relevant European standards and from our own production experience, and are given for engineering guidance. Standards are revised periodically. Verify all values against the current revision cited on your purchase order before using them in a stress-allowable calculation or a code-compliance submission.