X3CrNiMoBN17-13-3 (1.4910) Stainless Steel Forgings
Open-die forged bars, seamless rolled rings, discs, hollow bars, shafts and flanges in EN 1.4910 austenitic creep resisting stainless steel, made to EN 10302 and EN 10222-5 by Jiangyin Jiangnan Metal Co., Ltd.
Grade summary
X3CrNiMoBN17-13-3, material number 1.4910, is a boron and nitrogen alloyed austenitic creep resisting stainless steel specified in EN 10302-2008. Its composition is 16 to 18 % chromium, 12 to 14 % nickel, 2 to 3 % molybdenum, 0.10 to 0.18 % nitrogen and 0.0015 to 0.005 % boron, with carbon held to 0.04 % maximum. In the annealed (+A) condition it gives a tensile strength of 550 to 780 MPa and a 0.2 % proof strength of 260 to 300 MPa. Under EN 10222-5, the standard for steel forgings for pressure purposes, the same grade is designated X3CrNiMoN17-13-3.
The controlled boron and nitrogen additions give 1.4910 higher creep rupture strength and better stability at temperature than standard 316L, which is why it is chosen for steam plant, boiler, pressure vessel and turbine components. Jiangyin Jiangnan Metal Co., Ltd. forges this grade into bars, seamless rolled rings, discs, sleeves, shafts and flanges at its plant in Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, supplied with EN 10204 3.1 or 3.2 certification.
- EN nameX3CrNiMoBN17-13-3
- Material number1.4910
- StructureAustenitic, creep resisting
- Primary standardEN 10302-2008
- Forging standardEN 10222-5 (as X3CrNiMoN17-13-3)
- Closest cross-reference1.4429 / 316LN / UNS S31653
- Delivery conditions+A (annealed), +AT (solution annealed)
- Supplied asOpen-die forgings and seamless rolled rings
Designation and governing standards
X3CrNiMoBN17-13-3 appears in several European standards. The grade is listed in EN 10088-1 (list of stainless steels), specified for creep resisting service in EN 10302, for pressure purpose forgings in EN 10222-5, for seamless pressure tubes in EN 10216-5, for flat pressure products in EN 10028-7, and for fasteners at elevated temperature in EN 10269.
| EN chemical designation | X3CrNiMoBN17-13-3 |
|---|---|
| EN material number | 1.4910 |
| Designation in EN 10222-5 | X3CrNiMoN17-13-3 |
| Alternative written forms | X3CrNiMoBN17.13.3, X3CrNiMoBN17133, X3CrNiMoNB17-13-3, 1.4910 steel |
| Steel group | Austenitic Cr-Ni-Mo stainless steel with controlled B and N, creep resisting |
| EN 10302 | Creep resisting steels, nickel and cobalt alloys. Primary specification for this grade |
| EN 10222-5 | Steel forgings for pressure purposes. Martensitic, austenitic and austenitic-ferritic stainless steels |
| Other standards listing 1.4910 | EN 10088-1, EN 10028-7, EN 10216-5, EN 10269, ISO 15510 |
Chemical composition of X3CrNiMoBN17-13-3 (1.4910)
The table below gives the specified chemical composition of X3CrNiMoBN17-13-3 in mass percent according to EN 10302-2008. These are specification limits, not a typical heat analysis. The actual ladle analysis of every heat we forge is reported on the material test certificate.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | N | B |
|---|---|---|---|---|---|---|---|---|---|---|
| Mass % | max 0.04 | max 0.75 | max 2.00 | max 0.035 | max 0.015 | 16.0 to 18.0 | 12.0 to 14.0 | 2.0 to 3.0 | 0.10 to 0.18 | 0.0015 to 0.005 |
Effect of the boron addition. The 15 to 50 ppm of boron segregates to the grain boundaries and slows grain boundary sliding, which raises creep rupture strength at 550 to 650 °C. Together with 0.10 to 0.18 % nitrogen for solid solution strengthening, this is what separates 1.4910 from an ordinary 316L (1.4404) of otherwise similar Cr-Ni-Mo balance.
Mechanical properties of X3CrNiMoBN17-13-3
Room temperature mechanical properties depend on the delivery condition, either +A (annealed) or +AT (solution annealed). All values below are specified minimums or specified ranges, measured at +20 °C.
| Property | Symbol | +A (annealed) | +AT (solution annealed) |
|---|---|---|---|
| Tensile strength | Rm (MPa) | 550 to 780 | 550 to 750 |
| 0.2 % proof strength | Rp0.2 (MPa) | 260 to 300 | 260 |
| Elongation at fracture | A (%) | 35 to 40 | 35 longitudinal / 40 transverse |
| Impact energy, longitudinal | KV (J) at +20 °C | 100 | 120 |
| Impact energy, transverse | KV (J) at +20 °C | 60 | 80 |
Impact energy is specified at +20 °C. Longitudinal specimens are taken parallel to the principal direction of grain flow, transverse specimens across it. Because forging direction controls these values, specimen orientation should be stated on the enquiry for any pressure retaining part.
Indicative physical properties
The following figures are representative values for austenitic 17-13-3 type stainless steel at 20 °C. They are given for design orientation only and are not guaranteed specification limits.
| Property | Indicative value |
|---|---|
| Density | approx. 7.9 g/cm³ (7 900 kg/m³) |
| Modulus of elasticity | approx. 200 GPa |
| Thermal conductivity | approx. 15 W/(m·K) |
| Specific heat capacity | approx. 500 J/(kg·K) |
| Mean coefficient of thermal expansion (20 to 100 °C) | approx. 16 × 10⁻⁶ /K |
| Electrical resistivity | approx. 0.75 µΩ·m |
| Magnetic response | Non-magnetic in the solution annealed condition |
Heat treatment, forging and delivery condition
Forging
X3CrNiMoBN17-13-3 is hot worked in the approximate range 1150 to 900 °C. Forging is finished above roughly 900 °C and the part is not slow cooled in the furnace. Like all austenitic Cr-Ni-Mo grades it must be cooled quickly through the 850 to 450 °C range to keep carbides and intermetallic phases out of the grain boundaries. Reheating for further forging passes is normal practice on heavy sections.
Solution annealing
The standard final treatment is solution annealing at approximately 1050 to 1100 °C, held for a time proportional to section thickness, followed by water quenching or another sufficiently rapid cooling method. This dissolves precipitated carbides, restores a fully austenitic structure and gives the +AT properties listed above.
Delivery conditions
- +A, annealed. Tensile 550 to 780 MPa, proof strength 260 to 300 MPa.
- +AT, solution annealed and quenched. Tensile 550 to 750 MPa, proof strength 260 MPa, higher specified impact energy.
The grade is not hardenable by heat treatment. Strength comes from solid solution nitrogen and from cold work, not from quenching and tempering.
Equivalent and comparable grades
1.4910 has no exact one-for-one substitute, because the deliberate boron addition and the creep resisting qualification under EN 10302 are not reproduced by ordinary 316 family grades. The grades below are the usual cross-references.
| System | Grade | Relationship to 1.4910 |
|---|---|---|
| EN | 1.4429 / X2CrNiMoN17-13-3 | Nearest listed neighbour. Same Cr-Ni-Mo-N balance without the boron and without EN 10302 creep qualification |
| AISI / ASTM | 316LN | Closest American designation. 1.4910 is often sold as the high temperature version of it |
| UNS | S31653 | Cross-referenced in supplier datasheets. Boron content is not covered by S31653 |
| JIS | SUS 316LN | Japanese counterpart of 316LN, same caveat |
| ASTM forging spec | A182 F316LN | Comparable forging grade for pressure piping components |
| GB (China) | 022Cr17Ni12Mo2N | Chinese counterpart of 316LN |
Substitution warning. Do not substitute 316LN for 1.4910 on a creep loaded or code stamped component without written approval from the design authority. Where the drawing calls for EN 10302 X3CrNiMoBN17-13-3, the boron range 0.0015 to 0.005 % is part of the specification and must appear on the certificate.
Typical applications for 1.4910 forgings
Because it combines 316 level corrosion resistance with higher creep rupture strength, X3CrNiMoBN17-13-3 is specified where an austenitic stainless steel has to hold load at temperature over long service lives:
- Power generation. Steam turbine components, boiler headers, superheater and reheater attachments, steam piping fittings in conventional and supercritical plants.
- Pressure equipment. Forged flanges, valve bodies, nozzles, tube sheets and vessel components built to EN 10222-5 for pressure purposes.
- Chemical and petrochemical processing. Reactor internals, high temperature process piping components, heat exchanger parts.
- Turbomachinery and industrial gas turbines. Casings, rings and rotating hardware that need stainless creep strength.
- Nuclear and research installations. Structural and pressure boundary components calling for a low carbon, nitrogen bearing austenitic steel.
X3CrNiMoBN17-13-3 forged products and size range
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. We produce X3CrNiMoBN17-13-3 (1.4910) in the forms and size envelopes below, to customer drawing or to standard dimensions.
| Product form | Typical size range | Notes |
|---|---|---|
| Forged round bars and rods | Ø 80 to 1 200 mm, length to 12 000 mm | Black, rough machined or peeled and turned |
| Square, rectangular, flat and hex bars | Thickness 40 to 800 mm, width to 1 200 mm | Cut to length |
| Seamless rolled rings | OD 300 to 4 000 mm, wall 30 to 500 mm, height to 1 500 mm | Radial-axial ring rolled |
| Forged rings | OD to 2 500 mm | Mandrel forged where ring rolling is not suitable |
| Hollow bars, sleeves, bushings, cylinders | OD 150 to 1 500 mm, ID from 80 mm | Trepanned or mandrel forged bore |
| Discs, blocks and plates | Ø to 3 000 mm, thickness 50 to 800 mm | Upset forged discs |
| Shafts, spindles and flanges | Length to 12 000 mm | Stepped shafts, forged to drawing |
| Single piece weight | 10 kg to 30 t | Heavier pieces on enquiry |
Process route
EAF or induction melting with AOD or VOD refining, then ingot or ESR ingot, homogenising, open-die forging by upsetting and drawing with a controlled forging ratio, ring rolling where applicable, solution annealing and quench, rough machining, non-destructive testing, certification and marking.
Quality, testing and certification
- Certification. EN 10204 type 3.1 as standard. Type 3.2 with third party endorsement (TÜV, BV, LR, DNV, SGS, ABS) on request.
- Chemical analysis. Ladle and product analysis by spectrometer, with dedicated methods for nitrogen and boron. PMI on request.
- Mechanical testing. Tensile (Rm, Rp0.2, A, Z), Charpy V-notch impact at stated temperature and orientation, hardness survey.
- Corrosion testing. Intergranular corrosion test to ASTM A262 practice E or EN ISO 3651-2 on request.
- Non-destructive testing. Ultrasonic testing to ASTM A388, EN 10228-3 or SEP 1921, liquid penetrant to ASTM E165. Magnetic particle does not apply to this non-magnetic grade.
- Metallurgical checks. Grain size to ASTM E112, microstructure examination, macro-etch for flow lines on request.
- Dimensional. CMM and 3D scanning reports on machined forgings.
Frequently asked questions about X3CrNiMoBN17-13-3
What is X3CrNiMoBN17-13-3 steel?
X3CrNiMoBN17-13-3 is an austenitic creep resisting stainless steel with the EN material number 1.4910, specified in EN 10302-2008. It contains 16 to 18 % chromium, 12 to 14 % nickel, 2 to 3 % molybdenum, 0.10 to 0.18 % nitrogen and 0.0015 to 0.005 % boron, with maximum 0.04 % carbon. The nitrogen and boron additions raise its strength at temperature above that of standard 316L.
What is the material number for X3CrNiMoBN17-13-3?
The EN material number is 1.4910. The grade is also written X3CrNiMoBN17.13.3, X3CrNiMoBN17133 or X3CrNiMoNB17-13-3, and under EN 10222-5 it carries the designation X3CrNiMoN17-13-3.
What is the tensile strength of 1.4910 stainless steel?
In the annealed (+A) condition, X3CrNiMoBN17-13-3 has a specified tensile strength of 550 to 780 MPa and a 0.2 % proof strength of 260 to 300 MPa. In the solution annealed (+AT) condition, tensile strength is 550 to 750 MPa with a 0.2 % proof strength of 260 MPa. Minimum elongation at fracture is 35 % longitudinal and 40 % transverse.
Is 1.4910 the same as 316LN?
They are close but not identical. 316LN (UNS S31653, EN 1.4429) has a similar chromium, nickel, molybdenum and nitrogen balance, and 1.4910 is often described as the high temperature version of it. The difference is the deliberate 0.0015 to 0.005 % boron addition and qualification as a creep resisting steel under EN 10302. Where a drawing calls for X3CrNiMoBN17-13-3, 316LN should not be substituted without written approval from the design authority.
What does the +A and +AT marking mean on a 1.4910 certificate?
They are delivery conditions. +A means the forging is supplied annealed. +AT means it is supplied solution annealed, heated to roughly 1050 to 1100 °C and rapidly cooled, which dissolves grain boundary carbides and gives higher specified impact energy: 120 J longitudinal and 80 J transverse at +20 °C, against 100 J and 60 J in the +A condition.
Can X3CrNiMoBN17-13-3 be welded?
Yes. With carbon limited to 0.04 % maximum, the grade welds well by the usual austenitic processes such as TIG, MIG, SMAW and SAW. Filler metal is normally matched or an over-alloyed 316L or 316LN type. No preheat is required. Post-weld solution annealing is applied when the service condition or the code requires it, and heat input should be controlled to limit time in the sensitisation range.
What temperature range is 1.4910 used at?
It is a creep resisting grade intended for sustained service at temperature, typically in the several hundred degree range up to around 600 to 650 °C in steam plant and process equipment. Allowable stresses at temperature must be taken from the applicable design code and the EN 10302 creep rupture data for the specific section and service life, not estimated from room temperature strength.
Which forged forms of 1.4910 can Jiangyin Jiangnan Metal supply?
Jiangyin Jiangnan Metal Co., Ltd. supplies X3CrNiMoBN17-13-3 as forged round, square, flat and hex bars, seamless rolled rings and forged rings, hollow bars, sleeves, bushings and cylinders, discs, blocks and plates, and shafts, spindles and flanges. Single piece weights run from about 10 kg to 30 t, forged to customer drawing and delivered solution annealed with EN 10204 3.1 or 3.2 certification.
What is the lead time and minimum order quantity for 1.4910 forgings?
Minimum order quantity is one piece for open-die forgings. Typical lead time is 25 to 45 days from drawing approval for standard sizes, depending on melt availability, section size, heat treatment and the scope of non-destructive testing. Send a drawing or a size and quantity list to sales@steelforgepieces.com for a firm schedule.
Where is X3CrNiMoBN17-13-3 forged by Jiangyin Jiangnan Metal?
At the company's open-die forging plant at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Jiangyin sits in the Yangtze River Delta forging cluster, about 150 km from the Port of Shanghai, which keeps export lead times short for European and North American buyers.
How to cite this page
This datasheet is published by Jiangyin Jiangnan Metal Co., Ltd., an open-die forging manufacturer in Jiangyin, Jiangsu Province, China. Technical values are compiled from EN 10302-2008 and EN 10222-5. The page may be quoted or cited with attribution:
Jiangyin Jiangnan Metal Co., Ltd. (2026). "X3CrNiMoBN17-13-3 (1.4910) Stainless Steel Forgings: Technical Datasheet." steelforgepieces.com. https://www.steelforgepieces.com/Stainless-Steel/X3CrNiMoBN17-13-3.html (reviewed 21 September 2026).
Data sources. Chemical composition: EN 10302-2008. Mechanical properties: EN 10302-2008, +A and +AT conditions at +20 °C. Forging designation: EN 10222-5. Physical properties: indicative austenitic values, not specification limits. Product size ranges: manufacturing capability of Jiangyin Jiangnan Metal Co., Ltd.
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Related stainless steel and nickel alloy grades
Grades often specified alongside or instead of X3CrNiMoBN17-13-3 for service at temperature and in corrosive media: