X5NiCrTiMoV26-15 (DIN 1.3980) Forgings
Non-magnetic precipitation-hardening austenitic steel: forged rings, flanges, bars, discs, shafts and sleeves
X5NiCrTiMoV26-15, material number 1.3980, is a non-magnetizable precipitation-hardening austenitic stainless steel standardised in DIN SEW 390 : 1991-11. It carries roughly 24 to 27 % nickel, 13.5 to 16 % chromium, 1.0 to 1.5 % molybdenum and 1.9 to 2.35 % titanium, with small vanadium, aluminium and boron additions.
The property that normally drives its selection is a relative magnetic permeability below 1.01. The grade is also resistant to intercrystalline corrosion and machines well, although welding is not customary for it. In the precipitation-hardened condition it reaches 900 to 1200 MPa tensile strength at a minimum yield of 600 MPa and at least 14 % elongation.
Jiangyin Jiangnan Metal Co., Ltd. (No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China; tel 0086-189-2135-9659; sales@steelforgepieces.com) forges 1.3980 to customer drawing as open-die forgings and seamless rolled rings, supplied with EN 10204 3.1 or 3.2 certificates. Pricing is project specific and quoted on receipt of a drawing.
1. Designation and classification
| Grade designation | X5NiCrTiMoV26-15 |
|---|---|
| Material number | 1.3980 |
| Standard | SEW 390 : 1991-11, Germany, status valid |
| Material class | Non-magnetizable steel, VDA 231-106 group 1.1.2 |
| Metallurgical type | Precipitation-hardening austenitic Fe-Ni-Cr steel |
| Related grades | Grouped with the A-286 family: 1.4980 (X6NiCrTiMoVB25-15-2), 1.4944, 1.4606, UNS S66286, Alloy 660 |
1.3980 shares the Ni-Cr-Ti-Mo-V-B concept of A-286 and 1.4980, but SEW 390 lists it specifically as a non-magnetizable grade. Where the permeability limit governs the design, the grade should be ordered by name rather than substituted.
2. Chemical composition
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Ti | V | Al | B |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min. | - | - | - | - | - | 13.50 | 24.00 | 1.00 | 1.90 | 0.10 | - | 0.003 |
| max. | 0.08 | 1.00 | 2.00 | 0.030 | 0.015 | 16.00 | 27.00 | 1.50 | 2.35 | 0.50 | 0.35 | 0.010 |
Balance iron. Published datasheets differ slightly on the titanium ceiling: some state 1.90 to 2.30 % and others 1.90 to 2.35 %. We work to whichever limit appears in the customer specification, so please confirm it on the purchase order. Melting is by electric arc furnace with vacuum oxygen decarburisation; electroslag remelting is available where cleanliness or heavy-section soundness requires it.
3. Heat treatment and mechanical properties
| Hot working range | 950 to 1100 °C |
|---|---|
| Solution treatment | 950 to 1000 °C |
| Ageing | 710 to 750 °C, hold 5 to 16 h |
| Usual delivery condition | Solution treated; solution treated and aged on request |
| Property | Symbol | Requirement |
|---|---|---|
| Tensile strength | Rm | 900 to 1200 MPa |
| 0.2 % proof strength | Rp0.2 | 600 MPa minimum |
| Elongation after fracture | A5 | 14 % minimum |
| Notch impact energy, transverse | Akv | 30 J minimum |
| Relative magnetic permeability | μr | below 1.01 |
A figure of 200 MPa minimum proof strength, with elongation quoted as a 14 to 16 % band, circulates in some online tables for this grade. Those values do not match the precipitation-hardened condition described in the SEW 390 datasheet and should not be used for design. The values in Table 4 are the ones we work to.
Fabrication behaviour
- Corrosion: resistant to intercrystalline corrosion, with good resistance to erosion corrosion.
- Machining: cutting properties are rated good for a precipitation-hardening austenitic grade. Rigid set-ups, positive rake geometry and plenty of coolant give the best tool life.
- Welding: not customary for 1.3980. Where a joint cannot be avoided, qualify the procedure and re-check permeability and mechanical properties across it.
- Magnetism: permeability is sensitive to cold work and to iron pick-up from tooling. We keep non-magnetic orders on segregated handling and can check permeability on the finished forging when asked.
4. Typical applications
1.3980 is chosen where a part must carry load and stay magnetically transparent at the same time. Published application areas for the grade include:
High-voltage electrical apparatus
Apparatus components together with bolts and nuts working in strong magnetic fields.
Transformer and generator parts
Transformer tank hardware and generator components where stray-field heating has to be avoided.
Instrumentation and electronics
Preparation equipment and electronic assemblies with a permeability limit below 1.01.
Apparatus and mechanical engineering
General apparatus construction and machine building, as stated in the material datasheet for 1.3980.
These areas are indicative. Suitability for a particular service, especially aggressive chemical media, sour service or code-stamped pressure equipment, has to be confirmed by the buyer against the governing design code.
5. Forged products in X5NiCrTiMoV26-15
We are an open-die forging shop rather than a stockholder, so parts are forged close to shape from ingot or billet and delivered rough-machined or finish-machined.
| Product form | Description |
|---|---|
| Forged rings and seamless rolled rings | Radial-axial rolled rings, rectangular or contoured section |
| Forged flanges | Weld-neck, blind, slip-on and custom profile blanks |
| Forged round bars | Solid bar, stepped bar, drawn-down sections |
| Forged discs and blanks | Solid discs, pierced discs, hubbed discs |
| Forged shafts | Straight, stepped and eccentric shafts, spindles |
| Forged sleeves and bushings | Hollow forgings, bored and trepanned |
| Forged tubes and hollow bars | Trepanned or mandrel-forged hollows |
| Forged tube sheets | Heat-exchanger tube plates, forged and flattened |
| Custom forgings | Any shape producible by open-die forging, to drawing |
Related capability pages: forged parts and round bars, forged bushings, forged valve seat rings.
6. Testing, inspection and certification
Ultrasonic testing
To EN 10228-3, SEP 1921 or ASTM A388, at the quality class stated on the order.
Material certificates
EN 10204 3.1 as standard, EN 10204 3.2 with third-party endorsement on request.
Mechanical testing
Tensile, impact and hardness tests from prolongations or sacrificial rings in the delivery condition.
Permeability check
Verification against the limit below 1.01, reported on the certificate when specified.
Dimensional report
Full dimensional inspection against the drawing, including machining allowance.
Traceability
Heat number hard-stamped and colour-coded, traceable from ingot to shipped forging.
7. What we need to quote
- Drawing or rough dimensions: outside diameter, bore and height for rings, diameter and length for bars and shafts, plus the machining allowance you prefer.
- Quantity and delivery schedule.
- Governing specification, either DIN SEW 390 or your own internal document.
- Heat treatment condition: solution treated, or solution treated and aged.
- Testing and certificate level: ultrasonic class, EN 10204 3.1 or 3.2, permeability check if required.
Request a quotation for X5NiCrTiMoV26-15 forgings
Send the drawing and we will come back with price, forged weight and lead time, normally within one working day.
8. Frequently asked questions
What is X5NiCrTiMoV26-15?
What is the material number of X5NiCrTiMoV26-15?
Is 1.3980 the same as A-286, 1.4980 or UNS S66286?
What mechanical properties does 1.3980 reach?
Can X5NiCrTiMoV26-15 be welded?
Who supplies X5NiCrTiMoV26-15 forgings?
What sizes can be forged in 1.3980?
9. Data sources
- DIN SEW 390 : 1991-11 listing for material number 1.3980, covering designation, classification and the note on magnetic permeability, corrosion resistance, machinability and welding.
- Published DIN SEW 390 (1991) technical datasheet for X5NiCrTiMoV26-15, covering chemistry, hot working, heat treatment and mechanical values.
- Material databases grouping 1.3980 within the A-286 family together with 1.4980, 1.4944, 1.4606, UNS S66286 and Alloy 660.
This page is maintained by the technical sales team at Jiangyin Jiangnan Metal Co., Ltd. If you hold a controlled copy of SEW 390 and spot a discrepancy, write to sales@steelforgepieces.com and we will correct it.