Z20CDNbV11 Forgings: EN 1.4913 / X19CrMoNbVN11-1 Creep-Resisting Steel
Z20CDNbV11 is the AFNOR (French) designation for a martensitic creep-resisting steel containing roughly 11% chromium with molybdenum, niobium, vanadium and nitrogen additions. It is standardised in Europe as X19CrMoNbVN11-1, material number EN 1.4913, under EN 10269 and EN 10302, and is used where components must carry load at temperatures up to about 580 °C: steam turbine blades and rotors, high-temperature bolting, and forged valve parts.
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China that manufactures Z20CDNbV11 to drawing as forged bars, seamless rolled rings, discs, hollow bars, sleeves, turbine blanks and valve components, supplied quenched and tempered with EN 10204 3.1 certification. Enquiries: sales@steelforgepieces.com · +86 189 2135 9659.
- AFNOR grade
- Z20CDNbV11
- EN number
- 1.4913
- EN name
- X19CrMoNbVN11-1
- Steel type
- Martensitic, 11% Cr
- Max service temp.
- ≈ 580 °C
- Delivery condition
- Quenched & tempered
- Tensile strength
- 800–1050 MPa
- Certification
- EN 10204 3.1 / 3.2
What is Z20CDNbV11?
Z20CDNbV11 belongs to the 12% chromium creep-resisting family that grew out of the original corrosion-resisting cutlery steels of the early twentieth century. Adding molybdenum, vanadium, niobium and nitrogen to a plain 12% Cr base raises strength well beyond what the base grade can hold. More to the point, it raises creep strength, which is the resistance to slow permanent deformation under sustained stress at temperature.
Creep becomes the governing design property for steels above roughly 450 °C. Conventional fossil-fired steam plant runs at main steam temperatures near 540–565 °C, which is why these steels are so widely specified in power generation. The niobium and nitrogen in Z20CDNbV11 form fine, thermally stable carbonitride particles that pin dislocations and grain boundaries, holding back creep deformation over design lives measured in hundreds of thousands of hours.
The grade offers moderate room-temperature strength, useful high-temperature proof strength, good creep rupture strength, moderate toughness and basic oxidation resistance. It is magnetic and air-hardening, and it hardens on welding, so it can only be welded under a properly qualified preheat and post-weld heat treatment procedure.
Z20CDNbV11 chemical composition
| Standard | C | Mn | Si | P | S | Cr | Mo | Ni | V | Nb | N |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AFNOR Z 20 CDNbV 11 |
0.18–0.25 | 0.30–0.80 | 0.10–0.50 | ≤ 0.025 | ≤ 0.015 | 10.0–12.0 | 0.50–1.00 | ≤ 1.00 | 0.10–0.30 | 0.25–0.55 | 0.05–0.10 |
| EN 1.4913 X19CrMoNbVN11-1 |
0.17–0.23 | 0.40–0.80 | 0.10–0.50 | ≤ 0.025 | ≤ 0.015 | 10.0–11.5 | 0.50–0.80 | 0.30–0.80 | 0.10–0.30 | 0.25–0.55 | 0.05–0.10 |
Balance iron. The EN 1.4913 row is shown for comparison: the European limits are slightly tighter on molybdenum and nickel and specify a nickel minimum. Where a purchase order calls up EN 10269 or EN 10302, we melt and certify to the EN limits. Tungsten is not a specified element in this grade.
Equivalent grades and applicable standards
Z20CDNbV11 appears under several national designations. The table below lists the cross-references most often quoted on enquiries and drawings. Cross-references are close but not always identical. Confirm the exact specification called up by your drawing before ordering.
| System / Country | Designation | Notes |
|---|---|---|
| AFNOR (France) | Z20CDNbV11, Z21CDNbV11 | Original designation on this page |
| EN / DIN (Europe) | X19CrMoNbVN11-1 (1.4913) | Primary equivalent; also 1.4916 |
| GOST (Russia) | 18Ch11MNFB / 18Х11МНФБ, EP291 | Turbine blade grade |
| JIS (Japan) | SUH 600 | Heat-resisting steel |
| GB (China) | 2Cr11NiMoNbVN / 18Cr11NiMoNbVN | Turbine blade and bolting steel |
| Trade names | Jethete X19 | Commercial designation used by some mills |
Applicable standards: EN 10269 (steels for fasteners with specified elevated-temperature properties), EN 10302 (creep-resisting steels, nickel and cobalt alloys), EN 10088-1 (list of stainless steels) and DIN 17240. Forgings are also supplied against customer specifications and to EN 10222 / ASTM A182-style forging requirements where a drawing calls for them.
Mechanical and creep properties
The values below are typical for Z20CDNbV11 in the quenched and tempered condition. Actual guaranteed values depend on section size, the tempering temperature chosen and the standard called up on the order.
| Property | Condition | Typical value |
|---|---|---|
| Tensile strength, Rm | 20 °C | 800–1050 MPa |
| 0.2% proof strength, Rp0.2 | 20 °C | 600–750 MPa min. |
| 0.2% proof strength, Rp0.2 | 550 °C | ≈ 280 MPa |
| Creep rupture strength | 550 °C / 100,000 h | ≈ 137 MPa |
| Impact energy, Charpy V (KV) | 20 °C | ≈ 50 J |
| Elongation, A | 20 °C | ≈ 14–16% |
| Maximum continuous service temperature | n/a | ≈ 580 °C |
| Oxidation / corrosion resistance | n/a | Basic; oxidising atmospheres only |
| Magnetic response | n/a | Ferromagnetic |
Indicative data for guidance and comparison only. It does not replace the mill test certificate. Figures for a specific order are confirmed on the EN 10204 3.1 certificate issued with the forgings.
Heat treatment of Z20CDNbV11
Z20CDNbV11 develops its properties through austenitising, hardening and a high tempering treatment. The grade air-hardens, so cooling rate control and prompt tempering matter. Sections must not be left untempered.
| Operation | Temperature | Cooling / notes |
|---|---|---|
| Forging | 1150–1180 °C start, 900 °C finish | Slow cool after forging; never quench from the forging heat |
| Annealing / softening | ≈ 700–800 °C | Furnace cool, for machinability before final heat treatment |
| Austenitising / hardening | 1050–1100 °C | Oil or air quench depending on section |
| Tempering | 650–720 °C | Air cool; temperature selected to hit the required strength band |
| Stress relieving | ≈ 600–680 °C | Below the final tempering temperature |
Guideline values. Exact cycles are set per section size and per the acceptance standard, and are recorded on the heat treatment chart supplied with the order.
Z20CDNbV11 forged product forms we supply
All of the forms below are produced to drawing at our own plant. If your part is not on the list, send the drawing anyway, because everything is made to order and the list is not a limit.
- Forged barsRound, square, rectangular, flat and hexagonal bar in Z20CDNbV11, rough turned or black as forged.
- Seamless rolled ringsRing-rolled blanks, including steam turbine gland seal rings, sealing rings and guide rings.
- Hollow bars & sleevesBored hollow bars, sleeves, bushes and bushings, pipe and tube blanks, barrels, casings, shells, cylinders, hubs and housings.
- Discs, blocks & platesForged discs, disks, blocks and plate blanks for machining into turbine and valve internals.
- Turbine & compressor blanksRotor shafts, wheels, impellers, blade blanks, bolts and stud blanks for steam turbines and compressors.
- Valve componentsForged gate, check and control valve bodies and bonnets, valve stems, spindles, rods, seats and discs.
Size range, tolerances and forging capability
Jiangyin Jiangnan Metal is a forging works, not a stockholder. Both the grade and the geometry follow your drawing rather than whatever happens to be on the rack.
- Forging route: EAF + LF + VD refined ingot or continuous cast bloom, upset and drawn on open-die hammers and presses, or rolled on a ring mill for ring geometries.
- Bar diameter: approx. Ø80–Ø800 mm
- Ring outside diameter: approx. 200–3000 mm
- Single piece weight: approx. 20 kg to 10 t
- Machining allowance: as forged, rough machined, or finish machined to drawing
- Minimum order: single-piece prototypes accepted; no stock minimum on made-to-order forgings
- Forging ratio: confirmed per part and recorded on the process sheet, typically ≥ 3:1 for critical service parts
Applications of Z20CDNbV11
The grade is specified wherever a component sees sustained stress at temperature and where a nickel-base alloy would be unnecessarily expensive:
- Steam turbines: blades, rotor shafts, discs, wheels, gland seal and guide rings
- Gas turbines and compressors: blades, impellers, retaining components
- High-temperature bolting: bolts, studs and nuts for flanged joints in steam service
- Valves: bodies, bonnets, stems, spindles, seats and discs for high-temperature steam lines
- Boiler and pressure equipment: fasteners and internals operating in the creep range
- Petrochemical and process plant: components in oxidising service up to about 580 °C
Welding and machining notes
Welding
Z20CDNbV11 is weldable with care. Because the steel air-hardens, an untreated heat-affected zone will be hard and brittle. A qualified procedure normally calls for preheat, a controlled interpass temperature, matching or suitable low-hydrogen consumables, and a post-weld heat treatment below the original tempering temperature to temper the weld and heat-affected zone. Where a welded joint will operate in the creep range, the procedure qualification must cover the service temperature, not just room-temperature acceptance.
Machining
Machining is best carried out in the annealed or softened condition where the design allows. In the fully quenched and tempered condition the grade machines like other hardened 12% Cr martensitic steels: rigid setups, sharp positive-rake tooling, moderate speeds with adequate feed to stay under the work-hardened layer, and generous coolant. Grinding and finish operations should avoid overheating the surface.
Testing, inspection and certification
Every Z20CDNbV11 order leaves our works with a documented material history. Standard scope includes:
- Chemical analysis: heat (ladle) analysis, with product analysis on request
- Mechanical testing: tensile, 0.2% proof strength, elongation, reduction of area, Charpy V impact and hardness
- Elevated-temperature testing: hot tensile testing at the specified service temperature where the order calls for it
- Non-destructive testing: ultrasonic (UT), magnetic particle (MT) and dye penetrant (PT) inspection to the acceptance class on the drawing
- Heat treatment records: furnace charts for each batch
- Dimensional report: against the supplied drawing
- Certification: EN 10204 3.1 as standard; EN 10204 3.2 with third-party witness by TÜV, SGS, BV, Lloyd's Register or the customer's own inspector on request
Why source Z20CDNbV11 forgings from Jiangyin Jiangnan Metal
Jiangyin Jiangnan Metal Co., Ltd. is based at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, in the Yangtze River delta forging cluster, roughly two hours from the ports of Shanghai and Ningbo. We forge in-house rather than broker, which keeps the metallurgical route, the heat treatment and the test records under one roof.
- Open-die forging and ring rolling for one-off prototypes through to production batches
- Carbon, alloy, tool and stainless steels and nickel-base alloys, so one supplier covers an assembly that mixes grades
- Made to drawing: as forged, rough machined or finish machined
- Full traceability from heat number to finished part, with EN 10204 3.1 as standard
- Quotations normally returned within one working day
- Export documentation and packing prepared for sea and air freight worldwide
How to request a quotation
- Send the drawing. Email a 2D drawing, 3D model or written specification to sales@steelforgepieces.com, stating grade Z20CDNbV11 or EN 1.4913.
- Confirm the details. Tell us the quantity, whether you want it as forged or machined, the delivery condition, test requirements and certification level.
- Receive the quotation. We reply with a firm price, the proposed forging route and a lead time, normally within one working day.
- Approve and produce. On approval you receive the forging and heat treatment plan, then the finished parts with the EN 10204 3.1 certificate.
Frequently asked questions about Z20CDNbV11
What is Z20CDNbV11 steel?
Z20CDNbV11 is the AFNOR (French) designation for a martensitic creep-resisting steel containing about 11% chromium with molybdenum, niobium, vanadium and nitrogen additions. It is used for components that must carry load at elevated temperature, typically up to about 580 °C, such as steam turbine blades and rotors, high-temperature bolting and forged valve parts.
What is the EN equivalent of Z20CDNbV11?
The European equivalent of Z20CDNbV11 is X19CrMoNbVN11-1, material number EN 1.4913, covered by EN 10269 and EN 10302. Closely related designations include Z21CDNbV11 (AFNOR), 1.4916, 18Ch11MNFB / EP291 (GOST), SUH 600 (JIS) and 2Cr11NiMoNbVN (GB).
What is the chemical composition of Z20CDNbV11?
Typical Z20CDNbV11 limits are C 0.18–0.25%, Mn 0.30–0.80%, Si 0.10–0.50%, P max 0.025%, S max 0.015%, Cr 10.0–12.0%, Mo 0.50–1.00%, Ni max 1.00%, V 0.10–0.30%, Nb 0.25–0.55% and N 0.05–0.10%, with the balance iron.
What are the mechanical properties of Z20CDNbV11?
In the quenched and tempered condition Z20CDNbV11 typically reaches 800–1050 MPa tensile strength and 600–750 MPa 0.2% proof strength at room temperature, around 280 MPa 0.2% proof strength at 550 °C, roughly 50 J Charpy V impact energy at room temperature, and a 100,000-hour creep rupture strength of about 137 MPa at 550 °C.
Is Z20CDNbV11 a stainless steel?
It is classified with the martensitic stainless steels because its chromium content exceeds 10.5%, but it should be treated as a heat-resisting steel rather than a corrosion-resisting one. Its corrosion resistance is basic and limited to oxidising conditions; it is specified for creep strength, not for service in aggressive media.
Can Z20CDNbV11 be welded?
Yes, with care. The steel air-hardens, so welding requires preheat, a controlled interpass temperature and a post-weld heat treatment to temper the heat-affected zone and restore toughness. Procedures should be qualified for the specific section thickness and service temperature.
What forged products can be supplied in Z20CDNbV11?
Jiangyin Jiangnan Metal supplies Z20CDNbV11 as forged round, square, flat and hexagonal bars; seamless rolled rings and gland seal rings; discs, blocks and plates; hollow bars, sleeves, bushings, cylinders and shells; turbine and compressor blanks such as rotor shafts, wheels and impellers; and forged valve bodies, bonnets, stems, seats and discs.
What certification is supplied with Z20CDNbV11 forgings?
Every order is supplied with an EN 10204 3.1 mill test certificate covering heat analysis, heat treatment record and mechanical test results. EN 10204 3.2 certification with third-party inspection by agencies such as TÜV, SGS, BV or Lloyd's Register can be arranged on request, together with ultrasonic, magnetic particle and dye penetrant test reports.
How do I get a price for Z20CDNbV11 forgings?
Send a drawing or specification with the grade, finished or rough dimensions, quantity, delivery condition and certification requirements to sales@steelforgepieces.com, or call +86 189 2135 9659. We normally reply with a firm quotation within one working day.
Related grades
Other alloy steel and high-temperature grades we forge:
- AISI 4140 forgings, general-purpose Cr-Mo through-hardening alloy steel
- 42CrMo4 forgings, European equivalent of 4140, material 1.7225
- 17-4PH forgings, precipitation-hardening martensitic stainless
- Inconel 718 forgings, when service temperature exceeds the reach of 12% Cr steels
- Nimonic 80A forgings, high-temperature valve and fastener alloy
- Browse all alloy steel grades
Request a quotation for Z20CDNbV11 forgings
Send your drawing and we will quote the forging route, lead time and price, normally within one working day.
Jiangyin Jiangnan Metal Co., Ltd.
No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Disclaimer: the technical data on this page is typical or indicative, compiled for comparison and preliminary selection. It does not constitute a guarantee of properties for any particular order or application. Confirm requirements against the applicable standard and the mill test certificate supplied with your material. Page maintained by the technical sales team at Jiangyin Jiangnan Metal Co., Ltd.; last reviewed .