X6NiCrTiMoVB25-15-2
- W.Nr. 1.4980
- A286
- UNS S66286
- ASTM A453 Gr 660
- SUH660
- GH2132
Melted, forged, heat-treated and tested in one works. Rings to OD 6,000 mm. Single pieces to 30 t.
X6NiCrTiMoVB25-15-2, material number 1.4980, is an age-hardening austenitic iron-nickel-chromium superalloy: about 25% nickel, 15% chromium, 2% titanium and 1.3% molybdenum, balance iron. It is non-magnetic, resists oxidation, and holds its strength and creep resistance to roughly 650 to 700 °C. Outside Europe the same alloy is sold as A286, UNS S66286 or ASTM A453 Grade 660.
Jiangyin Jiangnan Metal Co., Ltd. melts and forges this grade at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. The works runs vacuum induction melting, vacuum arc remelting and protective-atmosphere electroslag remelting, so double- and triple-melt A286 is produced on site instead of bought in as billet. Rings roll to 6,000 mm outside diameter, single pieces reach 30 tonnes, the minimum order is 10 kg and lead time runs 20 to 60 days.
- Material number
- 1.4980
- Alloy type
- Age-hardening austenitic Fe-Ni-Cr superalloy
- Reference standards
- EN 10302, EN 10269
- Density
- 8.0 g/cm³
- Melting routes
- EF, LF, VOD, VIM, VAR, ESR
- Delivery condition
- Solution annealed + precipitation hardened
- Magnetic response
- Non-magnetic
- Certification
- EN 10204 3.1 or 3.2
- Minimum order
- 10 kg, no minimum piece count
- Lead time
- 20 to 60 days
Equivalent and cross-reference grades
The same alloy carries a different name in almost every market. These are the designations buyers send us for this material.
| Region or body | Designation | Typical scope |
|---|---|---|
| Europe (EN) | X6NiCrTiMoVB25-15-2, 1.4980 | EN 10302 creep-resisting steels; EN 10269 fasteners |
| United States (UNS) | S66286 | Unified numbering |
| Trade name | A286, A-286, Alloy 286 | Common commercial name |
| ASTM | A453 Gr 660, A638 Gr 660 | Bolting for high-temperature service |
| SAE / AMS | 5731, 5732, 5734, 5737 | Aerospace bar and forging |
| Japan (JIS) | SUH660 | Heat-resisting steel |
| China (GB) | GH2132, 06Cr15Ni25Ti2MoAlVB | Superalloy for turbine and fastener use |
| France (AFNOR) | Z6NCTDV25-15 | National equivalent |
Older German literature lists this alloy under DIN 17240 and refers to the related material numbers 1.4944 and 1.4606. Chemistry limits differ slightly between those specifications, so name the standard and issue explicitly on the enquiry. The same alloy is covered on our Incoloy A-286 page under its American trade name.
Chemical composition
Percentage by mass to EN 10302. Iron makes up the balance.
| Element | Symbol | Minimum | Maximum |
|---|---|---|---|
| Carbon | C | 0.03 | 0.08 |
| Silicon | Si | – | 1.00 |
| Manganese | Mn | 1.00 | 2.00 |
| Phosphorus | P | – | 0.025 |
| Sulphur | S | – | 0.015 |
| Aluminium, total | Al | – | 0.35 |
| Boron | B | 0.003 | 0.010 |
| Chromium | Cr | 13.50 | 16.00 |
| Molybdenum | Mo | 1.00 | 1.50 |
| Nickel | Ni | 24.00 | 27.00 |
| Vanadium | V | 0.10 | 0.50 |
| Titanium | Ti | 1.90 | 2.30 |
| Iron | Fe | Balance | |
Melting route
Chemistry for this grade is set at the furnace, not taken from a supplier certificate. Clean and superalloy heats run through 3 t vacuum induction melting, then 6 t vacuum arc remelting or 3 t and 6 t protective-atmosphere electroslag remelting. Single, double and triple melt routes are all available on site, so an aerospace VIM + VAR requirement does not have to be subcontracted. State the melt route on the enquiry.
Mechanical properties
Room-temperature values for bar and forgings up to 300 mm diameter, solution annealed and precipitation hardened. "l" is longitudinal to the grain flow, "q" transverse and "t" tangential.
| Property | Symbol | Requirement |
|---|---|---|
| Tensile strength | Rm | 900 to 1200 MPa |
| 0.2% proof strength | Rp0.2 | ≥ 600 MPa |
| Elongation after fracture | A | l ≥ 16%, q ≥ 14% |
| Impact energy, Charpy V | Av | l ≥ 56 J, q/t ≥ 32 J |
Heat treatment
The alloy takes its strength from a solution treatment followed by ageing. Two routes are in common use: solution treat at about 900 °C for higher room-temperature tensile properties, or at about 980 °C where stress-rupture performance matters more. Both are aged around 16 hours at 700 to 720 °C and air cooled. Three high-temperature car-bottom furnaces on site cover the solution treatments this grade needs, and two 15 m well-type furnaces allow long shafts to be quenched vertically without distortion.
Values for sections above 300 mm, at elevated temperature, or to a specific AMS or ASTM class are available on request. Section size affects achievable properties, so quote your heaviest section when asking.
Forged shapes and size limits
Every part is forged to drawing or to a size list. If you only have the finished machined dimensions, say so and we will work back to the forging size.
| Product | Size limit | Set by |
|---|---|---|
| Seamless rolled rings | OD 50 to 6,000 mm | 6 m, 3 m and 1 m radial-axial ring mills; upset-and-punch route below 1 m |
| Forged flanges | to OD 5,000 mm | Ø5,000 mm vertical turning lathe |
| Shafts, spindles, rolls | to 14,000 mm length | C61160 horizontal lathe; 15 m well furnace for vertical quench |
| Discs, tube sheets, blocks | to Ø5,000 mm | Ø5,000 mm vertical turning lathe |
| Sleeves, bushings, hollow bars | to Ø1,600 × 10,000 mm bore | CNC deep-hole drilling machine |
| Round bars, blocks, blanks | to drawing | 6,300 t, 4,000 t and 2,000 t presses |
| Valve bodies, seat rings, stems | to drawing | Press and CNC machining; API 6A and NACE MR0175 on request |
| Single piece weight | 10 kg to 30,000 kg | 60 t maximum heat size; 6,300 t press |
Related pages: seamless rolled rings, forged flanges, forged shafts, forged bars and blocks, tube sheets and discs, valve and wellhead parts, forged cylinders and pipes.
Where this alloy is used
High strength to about 700 °C, low magnetic permeability and good toughness down to cryogenic temperature give this grade a specific set of applications.
- Gas and steam turbines. Rotor and casing hardware, blade roots, spacers, seal rings and shrouds in industrial and aero-derivative turbines.
- High-temperature fasteners. Bolting for piping and pressure equipment under ASTM A453 Grade 660, and automotive engine and exhaust manifold fasteners under sustained heat and vibration.
- Oil and gas. Subsea and deepwater production hardware, wellhead and Christmas tree components, downhole tools and non-magnetic drill collars.
- Pressure equipment. Shell-and-tube heat exchanger tube sheets, air receivers, pressure vessel flanges and nozzles.
- Power transmission. Gear blanks, compressor rotors, spindles and shafts in gearboxes and generator sets.
- Process and cryogenic plant. Nitrogen generators, industrial air compressors, crystalliser equipment and cold-service components.
- Nuclear and research. Structural and fastener components in reactor and heat-treatment equipment where magnetic response must stay low.
Testing, inspection and certification
The works holds CCS, BV, DNV, LR and NK approvals and runs its own laboratory. Because the steel is melted here, the certificate traces a part back to its melt number rather than stopping at a purchased billet.
- Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, on PXUT-3300, USM35XS and CTS-22 flaw detectors, to the acceptance class named on your order.
- Chemical analysis by optical emission spectrometry to ASTM E415, with infrared carbon and sulphur analysis to ASTM E1019 and handheld PMI verification.
- Tensile testing on 600 kN and 300 kN universal machines to ASTM A370 and ISO 6892.
- Charpy V impact testing to ASTM A370, with a low-temperature bath down to −60 °C.
- Magnetic particle examination to ASTM E709, and liquid penetrant where the drawing calls for it.
- Grain size and metallography to ASTM E112.
- Certification to EN 10204 3.1 as standard, or EN 10204 3.2 witnessed by CCS, BV, DNV, LR, NK, SGS, TÜV or your own inspector.
Tests outside the in-house scope, such as intergranular corrosion to ASTM A262 or impact below −60 °C, are placed with an accredited third-party laboratory and reported alongside the mill certificate. State the requirement on the enquiry so it is scheduled before shipment.
Frequently asked questions
What is X6NiCrTiMoVB25-15-2?
An age-hardening austenitic iron-nickel-chromium superalloy, material number 1.4980, with roughly 25% nickel, 15% chromium, 2% titanium and 1.3% molybdenum, balance iron. It is non-magnetic, resists oxidation and keeps useful strength and creep resistance to about 650 to 700 °C.
Jiangyin Jiangnan Metal Co., Ltd. melts and forges this grade into rings, flanges, shafts, discs and bars at its works in Zhouzhuang Town, Jiangyin City, Jiangsu Province, China.
What is X6NiCrTiMoVB25-15-2 equivalent to?
Its closest equivalents are A286 and UNS S66286 in the United States, ASTM A453 Grade 660 and ASTM A638 Grade 660 for bolting, AMS 5731, 5732, 5734 and 5737 in aerospace, SUH660 in Japan, GH2132 in China and Z6NCTDV25-15 in France.
Chemistry and property limits are not identical in every specification. Confirm the cross-reference against the standard issue named on your order before releasing a part against it.
What is the chemical composition of 1.4980 / A286?
By mass: C 0.03 to 0.08, Si max 1.00, Mn 1.00 to 2.00, P max 0.025, S max 0.015, Al total max 0.35, B 0.003 to 0.010, Cr 13.50 to 16.00, Mo 1.00 to 1.50, Ni 24.00 to 27.00, V 0.10 to 0.50, Ti 1.90 to 2.30, iron balance. Density is 8.0 g/cm³.
What are the mechanical properties after heat treatment?
For bar and forgings up to 300 mm diameter, solution annealed and precipitation hardened: Rm 900 to 1200 MPa, Rp0.2 at least 600 MPa, elongation at least 16% longitudinal and 14% transverse, Charpy V impact energy at least 56 J longitudinal and 32 J transverse or tangential.
What is the maximum service temperature?
The alloy is normally applied where strength and creep resistance are needed to about 650 or 700 °C, and it keeps its oxidation resistance above that. It also stays tough at cryogenic temperature.
The allowable temperature for a given part depends on the design code, the stress level and the required service life, so the design engineer sets it rather than a datasheet range.
Is X6NiCrTiMoVB25-15-2 magnetic?
No. The structure is austenitic and the alloy is essentially non-magnetic with low magnetic permeability. That is one reason it is chosen for downhole survey equipment, instrument housings and other assemblies that must not disturb a magnetic field.
Do you melt A286 in house, or buy the billet?
We melt it. The works runs a 3 t vacuum induction melting furnace, a 6 t vacuum arc remelting furnace and 3 t and 6 t protective-atmosphere electroslag remelting furnaces, so single, double and triple melt routes are produced on site.
Most forging shops in China import billet for this grade. That adds cost and lead time, and it stops the certificate short of the melt number.
What is the largest forging you can make in this grade?
Seamless rings roll to 6,000 mm outside diameter on the 6 m radial-axial mill, with 3 m and 1 m mills for smaller sizes and an upset-and-punch route from 50 mm. The heaviest single forging is 30 tonnes, worked on 6,300 t, 4,000 t and 2,000 t hydraulic presses.
Downstream sets the practical limits: discs machine to Ø5,000 mm, shafts turn to 14,000 mm between centres, and the deep-hole drilling machine bores Ø1,600 × 10,000 mm.
What testing and certification is supplied?
Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, magnetic particle examination to ASTM E709, optical emission spectrometry to ASTM E415, tensile and Charpy V impact testing to ASTM A370, and grain size to ASTM E112.
Certification is EN 10204 3.1 as standard, or EN 10204 3.2 witnessed by CCS, BV, DNV, LR, NK, SGS, TÜV or your own inspector. Heat-treatment charts, NDT reports and dimensional reports are sent with the shipment.
What is the minimum order and the lead time?
10 kg, with no minimum piece count, so a single part is quotable. Lead time runs 20 to 60 days from order confirmation.
This grade sits at the upper end of that range, because the remelting cycle, the slower forging schedule and the solution treatment all add days. Witnessed inspection to EN 10204 3.2 also needs scheduling, so flag it at enquiry stage.
Where is the factory, and can customers visit?
No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, on the south bank of the Yangtze between Shanghai and Nanjing. Wuxi Shuofang International Airport is 30 km away and the Shanghai airports are 160 km. Zhangjiagang and Shanghai are the nearest export ports.
Customer audits and third-party witness testing are welcome. Email sales@steelforgepieces.com to arrange a visit so an English-speaking engineer is available.
Request a quotation
Send the material grade, the dimensions or a drawing, the quantity, the delivery condition, the testing and certification requirements and the destination port. A price normally comes back within two working days.
Jiangyin Jiangnan Metal Co., Ltd.No.1 Chengxiqiao Road, Zhouzhuang Town
Jiangyin City, Jiangsu Province, China
Telephone, WhatsApp and WeChat: +86 189 2135 9659
Email: sales@steelforgepieces.com
Business hours: Monday to Saturday, 08:00 to 17:30 China Standard Time (UTC+8) Email your drawing Call the factory
Composition and property values follow EN 10302 and EN 10269 and are given for guidance. They do not replace the material specification agreed on your order. Page updated .