AFNOR Z8CN18-10
AFNOR Z2CND17-12 Stainless Steel
Introduction
AFNOR Z2CND17-12 stainless steel is an austenitic chromium-nickel-molybdenum stainless steel designation associated with the historical AFNOR system. It belongs to the 18Cr-Ni-Mo family and is designed for applications requiring a combination of corrosion resistance, ductility, weldability, and good fabrication characteristics.
The presence of molybdenum (Mo) improves resistance to localized corrosion, particularly pitting and crevice corrosion, compared with conventional chromium-nickel stainless steels without molybdenum. The relatively low carbon content is also beneficial for welded components where resistance to intergranular corrosion is important.
Z2CND17-12 is commonly compared with the AISI 316L / UNS S31603 / EN 1.4404 stainless steel family. However, historical AFNOR designations should not be considered automatically identical to modern grades. Exact equivalence should be confirmed using the applicable product standard, chemical composition, product form, delivery condition, and material test certificate (MTC).
Emirerri Steel supplies stainless steel products manufactured or sourced according to applicable AFNOR, EN, ASTM, ASME and project specifications.
Key Features
Historical AFNOR stainless steel designation
Austenitic chromium-nickel-molybdenum stainless steel
Low-carbon composition
Approximately 17% chromium
Approximately 12% nickel
Molybdenum addition for improved localized corrosion resistance
Good resistance to pitting and crevice corrosion
Good resistance to general corrosion
Excellent ductility
Good cold-forming characteristics
Very good weldability
Generally non-magnetic in the annealed condition
Not hardenable by conventional heat treatment
Suitable for fabricated and welded components
Available in multiple product forms
Specifications
| Property | AFNOR Z2CND17-12 |
|---|---|
| Standard / Designation | AFNOR Z2CND17-12 |
| Steel Family | Austenitic Stainless Steel |
| Alloy System | Chromium-Nickel-Molybdenum |
| Chromium | Approximately 17% |
| Nickel | Approximately 12% |
| Molybdenum | Present |
| Carbon | Low carbon |
| Corrosion Resistance | Very Good |
| Chloride Resistance | Good to Very Good |
| Pitting Resistance | Good |
| Crevice Corrosion Resistance | Good |
| Weldability | Very Good |
| Formability | Good |
| Ductility | High |
| Heat Treatment Hardening | Not hardenable by quenching |
| Magnetic Behaviour | Generally non-magnetic when annealed |
Values are indicative of the associated grade family. Applicable AFNOR/product specifications should be used for contractual requirements.
AFNOR Z2CND17-12 Equivalent Grades
AFNOR Z2CND17-12 is commonly associated with the following modern stainless steel grade family:
| Standard | Grade / Designation | Description |
|---|---|---|
| AFNOR | Z2CND17-12 | Austenitic Cr-Ni-Mo stainless steel |
| AISI | 316L* | Austenitic Cr-Ni-Mo stainless steel |
| UNS | S31603* | Low-carbon 316 family |
| EN | 1.4404* | X2CrNiMo17-12-2 |
| EN | X2CrNiMo17-12-2* | Austenitic Cr-Ni-Mo stainless steel |
*Important: These are commonly used comparison grades and should not be treated as automatic one-to-one equivalences. Final grade selection should be based on the applicable standard and MTC.
Available Products
Emirerri Steel can supply AFNOR Z2CND17-12 or technically equivalent stainless steel products in various forms, subject to specification and availability:
Stainless Steel Pipes
Seamless stainless steel pipes
Welded stainless steel pipes
Process piping
Industrial piping
Stainless Steel Tubes
Seamless tubes
Welded tubes
Instrumentation tubes
Heat exchanger tubes
Boiler and process tubes
Stainless Steel Sheets & Plates
Stainless steel sheets
Stainless steel plates
Hot-rolled plates
Cold-rolled sheets
Industrial plates
Stainless Steel Bars
Round bars
Bright bars
Forged bars
Machined bars
Stainless Steel Flanges & Fittings
Weld neck flanges
Slip-on flanges
Blind flanges
Threaded flanges
Lap joint flanges
Butt-weld fittings
Forged fittings
AFNOR Z2CND17-12 Chemical Composition
The following composition represents typical values associated with the 316L / X2CrNiMo17-12-2 family and should be treated as a reference rather than a contractual AFNOR chemical analysis.
| Element | Typical / Reference Composition |
|---|---|
| Carbon (C) | ≤ 0.03% |
| Chromium (Cr) | Approx. 16–18% |
| Nickel (Ni) | Approx. 10–14% |
| Molybdenum (Mo) | Approx. 2–3% |
| Manganese (Mn) | ≤ 2.0% |
| Silicon (Si) | ≤ 1.0% |
| Phosphorus (P) | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% |
| Nitrogen (N) | According to applicable specification |
| Iron (Fe) | Balance |
For engineering procurement, the chemical composition must be checked against the applicable AFNOR or product standard.
AFNOR Z2CND17-12 Mechanical Properties
Mechanical properties vary according to product form, heat treatment and applicable specification. Typical reference values for the associated 316L family include:
| Property | Typical Reference Value |
|---|---|
| Tensile Strength | ≥ 485 MPa |
| Yield Strength | ≥ 170 MPa |
| Elongation | ≥ 40% |
| Elastic Modulus | Approx. 193 GPa |
| Hardness | Dependent on product condition |
The certified mechanical properties should always be taken from the material test certificate for the supplied product.
AFNOR Z2CND17-12 Physical Properties
| Property | Typical Value |
|---|---|
| Density | Approx. 8.0 g/cm³ |
| Elastic Modulus | Approx. 193 GPa |
| Thermal Conductivity | Approx. 16 W/m·K |
| Specific Heat | Approx. 500 J/kg·K |
| Thermal Expansion | Approx. 16 × 10⁻⁶ /°C |
| Structure | Austenitic |
These values are typical reference data and may vary with temperature and material condition.
Types of AFNOR Z2CND17-12 Stainless Steel
Seamless Stainless Steel Pipe
Manufactured without a longitudinal weld, seamless pipe is suitable for demanding pressure, process and fluid-handling applications.
Welded Stainless Steel Pipe
Welded pipe provides an economical solution for many industrial piping systems and can be manufactured in large diameters.
Stainless Steel Tubes
Used for instrumentation, heat exchangers, process equipment and fluid-transfer systems.
Stainless Steel Sheets & Plates
Used for tanks, vessels, structural components, equipment fabrication and process systems.
Stainless Steel Round Bars
Suitable for machining, shafts, fasteners and fabricated components.
Stainless Steel Flanges & Fittings
Used for connecting and directing stainless steel piping systems.
Corrosion Resistance
The molybdenum content of Z2CND17-12 provides improved resistance to localized corrosion compared with conventional 18Cr-8Ni stainless steels.
The material provides good resistance against:
General atmospheric corrosion
Moist industrial environments
Many chemical solutions
Pitting corrosion
Crevice corrosion
Chloride-containing environments within appropriate limits
Process fluids encountered in many chemical applications
However, stainless steel selection should consider chloride concentration, temperature, pH, oxidizing conditions, crevices and contamination.
For highly aggressive chloride or marine environments, Duplex 2205 or Super Duplex 2507 may be considered depending on the design requirements.
Heat Resistance
AFNOR Z2CND17-12 provides useful performance at elevated temperatures, although its suitability for high-temperature service depends on the temperature range, exposure conditions, pressure and applicable design code.
It can be used in various:
- Process equipment
- Heat exchanger components
- Chemical processing systems
- Industrial piping
- Food-processing equipment
- Pharmaceutical equipment
For continuous high-temperature applications, the applicable design standard and material specification should be consulted before selection.
Heat Treatment
Z2CND17-12 belongs to the austenitic stainless steel family and cannot be hardened through conventional quenching and tempering.
Heat treatment is generally associated with:
- Solution annealing
- Stress relief where applicable
- Restoration of corrosion resistance after fabrication
- Control of metallurgical condition
The exact solution-annealing temperature and cooling procedure must follow the applicable material/product standard.
Welding
AFNOR Z2CND17-12 has very good weldability and can be welded using commonly used stainless steel welding processes.
Suitable processes may include:
TIG / GTAW
MIG / GMAW
SMAW
SAW
Orbital welding for suitable tube applications
Low-carbon chemistry is advantageous for welded fabrication because it reduces the risk of chromium-carbide precipitation compared with conventional higher-carbon grades.
Proper filler-metal selection, heat input control, shielding gas and post-weld cleaning are important for maintaining corrosion performance.
Fabrication
Z2CND17-12 can be fabricated using conventional stainless steel manufacturing techniques.
Typical operations include:
- Cutting
- Bending
- Rolling
- Forming
- Drilling
- Machining
- Punching
- Welding
- Forging
- Drawing
Because austenitic stainless steel can work-harden, appropriate tooling and machining parameters should be selected for demanding machining operations.
Surface Finishes
Depending on the product form and application, available finishes may include:
- 2B
- BA
- No. 1
- No. 4
- Brushed finish
- Satin finish
- Pickled and passivated
- Polished finish
- Mill finish
Surface treatment should be selected according to the application, hygiene requirements and corrosion environment.
Applications
AFNOR Z2CND17-12 stainless steel is suitable for a broad range of industrial applications.
Oil & Gas
Process piping
Flow lines
Valves and fittings
Offshore equipment
Chemical injection systems
Chemical & Petrochemical
- Process equipment
- Storage tanks
- Heat exchangers
- Piping systems
- Reactors and process components
Water Treatment
- Water-treatment equipment
- Filtration systems
- Pumping systems
- Piping and fittings
Food & Beverage
- Processing equipment
- Storage tanks
- Piping systems
- Dairy equipment
- Hygienic components
Pharmaceutical
- Process piping
- Tanks
- Equipment
- Hygienic process systems
Marine
- Marine equipment
- Piping components
- Coastal industrial equipment
- General corrosion-resistant components
Power Generation
- Process piping
- Heat-transfer equipment
- Auxiliary systems
- Industrial components
AFNOR Z2CND17-12 vs AISI 316L
| Property | AFNOR Z2CND17-12 | AISI 316L |
|---|---|---|
| Steel Family | Austenitic | Austenitic |
| Alloy System | Cr-Ni-Mo | Cr-Ni-Mo |
| Chromium | Approx. 17% | Approx. 16–18% |
| Nickel | Approx. 12% | Approx. 10–14% |
| Molybdenum | Present | Approx. 2–3% |
| Carbon | Low | ≤ 0.03% |
| Corrosion Resistance | Very Good | Very Good |
| Chloride Resistance | Good to Very Good | Good to Very Good |
| Weldability | Very Good | Excellent |
| Formability | Good | Excellent |
| Typical Modern Comparison | 316L family | 316L |
The comparison is intended for technical orientation. Exact equivalence must be confirmed against the applicable AFNOR, EN, ASTM or product specification.
Quality & Certification
Emirerri Steel can supply stainless steel products with documentation appropriate to the applicable purchase specification and project requirements.
Quality documentation may include:
Material Test Certificate (MTC)
EN 10204 3.1 certification where specified
Chemical composition analysis
Mechanical test results
Dimensional inspection
Visual and surface inspection
Heat-treatment records
PMI where required
Non-destructive testing where specified
Heat number traceability
Inspection reports
Third-party inspection documentation where required
Products can be supplied according to applicable AFNOR, EN, ASTM, ASME and customer/project specifications.
Why Choose AFNOR Z2CND17-12?
AFNOR Z2CND17-12 is considered for applications where the combination of austenitic structure, low carbon content, chromium, nickel and molybdenum is required.
Key advantages include:
Good general corrosion resistance
Improved resistance to pitting and crevice corrosion
Useful performance in chloride-containing environments
Low-carbon chemistry for welded construction
High ductility
Good formability
Very good weldability
Wide range of available product forms
Suitable for demanding industrial fabrication
Conclusion
AFNOR Z2CND17-12 stainless steel is an austenitic Cr-Ni-Mo stainless steel designation offering a useful balance of corrosion resistance, weldability, ductility and fabrication performance.
Its molybdenum addition makes it particularly relevant where improved resistance to localized corrosion is required compared with conventional chromium-nickel stainless steels. The grade is commonly compared with the AISI 316L / UNS S31603 / EN 1.4404 family, but exact equivalence should always be confirmed using the applicable standard and certified chemical and mechanical properties.
Emirerri Steel supplies stainless steel pipes, tubes, sheets, plates, round bars, flanges and fittings for industrial applications across North Africa and international markets, subject to project specifications and availability.
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