RCC-M M3304 Nuclear Power Grade Austenitic Stainless Steel Pipe
- 18-10 steel not containing Mo: Z6CN18-10, Z5CN18-10, Z2CN18-10, Z2CN19-10 (Controlled Nitrogen Content);
- 18-10 steel containing Mo: Z6CND17-12, Z5CND17-12, Z2CND17-12, Z2CDN18-12 (Controlled Nitrogen Content)
- Manufacturing Methods: hot-finished
- OD: 6 – 914mm WT: 1 – 50mm L: 6000-12000mm
Features
RCC-M M3304 Nuclear Power Grade Austenitic Stainless Steel Pipe
Chemical Composition Of Austenitic Stainless Steels Used Percentages Resistance to Accelerated Intergranular Corrosion
| AFNOR Grade | Max. C | Max. Si | Max. Mn | Max. P (4) | Max. S (4) | Cr | Ni | Mo | Max. Cu | Max. N | *ICT Type of Treatment (2) |
| Steel Type: 18-10 steel without Mo | |||||||||||
| Z6CN18-10 | 0.080 | 0.75 | 2.00 | 0.030 | 0.015 | 17.00/20.00 | 8.00/11.00 | – | |||
| Z5CN18-10 | 0.060 | 0.75 | 2.00 | 0.030 | 0.015 | 17.00/20.00 | 9.00/12.00 | 1.00 | A | ||
| Z2CN18-10 | 0.030 | 0.75 | 2.00 | 0.030 | 0.015 | 17.00/20.00 | 9.00/12.00 | 1.00 | – | ||
| Z2CN19-10 (Crld. N) | 0.035 | 1.00 | 2.00 | 0.030 | 0.015 | 18.50/20.00 | 9.00/10.00 | 1.00 | 0.080 | – | |
| Steel Type: 18-10 steel with Mo | |||||||||||
| Z6CND17-12 | 0.080 | 0.75 | 2.00 | 0.030 | 0.015 | 16.00/19.00 | 10.00/14.00 | 2.00/2.50 | – | ||
| Z5CND17-12 | ≤0.070 | 0.75 | 2.00 | 0.030 | 0.015 | 16.00/19.00 | 10.00/14.00 | 2.00/2.50 | 1.00 | A | |
| Z2CND17-12(3) | 0.030 | 0.75 | 2.00 | 0.030 | 0.015 | 16.00/19.00 | 10.00/14.00 | 2.00/2.50 | 1.00 | – | |
| Z2CND18-12(3) (Ctrld. N) | 0.035 | 1.00 | 2.00 | 0.030 | 0.015 | 17.00/18.00 | 11.50/12.50 | 2.25/2.75 | 1.00 | 0.080 | – |
Note:
*ICT=Intergranular Corrosion Test
(1) Boron content for products to be welded: 0.0018% max. as determined by product analysis.
(2) Test to be performed, if required, in accordance with the requirements of paragraph 2.3.
(3) Specific grades for auxiliary piping,
(4) For part analysis, the maximum guaranteed value is increased by 0.005%.
Mechanical Properties for Austenitic Stainless Steels Used
| Steel Type | AFNOR Grade | Reference Heat Treatment | Mechanical Properties on Pipes and Tubes | |||||||
| Temperature | ||||||||||
| Room | 350℃ | |||||||||
| Min. Rm MPa | Min. Rp0.2% MPa | Min. A% (5D) | Min.KV(J)(1) | Min. Rp0.2% MPa | Min. Rm MPa | |||||
| Long. | Trans. | Long. | Trans. | |||||||
| Steel 18-10 Without Mo | Z6CN18-10 | Quenching after maintaining between 1050℃ and 1150℃ | 520 | 210 | 45 | 40 | 100 | 60** | 125 | 394 |
| Z5CN18-10 | 520 | 210 | 45 | 40 | 100 | 60** | 125 | 394 | ||
| Z2CN18-10 | 490 | 175 | 45 | 40 | 100 | 60** | 105 | 350 | ||
| Z2CN19-10 (Ctrld. N) | 520 | 210 | 45 | 40 | 100 | 60** | 125 | 394 | ||
| Steel 18-10 With Mo | Z6CND17-12 | 520 | 210 | 45 | 40 | 100 | 60** | 130 | 445 | |
| Z5CND17-12 | 520 | 210 | 45 | 40 | 100 | 60** | 130 | 445 | ||
| Z2CND17-12 | 490 | 175 | 45 | 40 | 100 | 60** | 105 | 355 | ||
| Z2CND18-12 (Ctrld. N) | 520 | 220 | 45 | 40 | 100 | 60** | 135 | 445 | ||
| Steel 18-10 with Mo work-hardened* | Z5CND17-12 | 690 | 490 | 20 | / | / | / | 279 | / | |
*For non-pressure parts.
**Value raised to 100J for class 1 equipment
(1)The impact test may be waived if the A% elongation value at ambient temperature is certified greater than or equal to 45% by the material manufacturer.
Technical Specifications
| Specification | Value |
| Standard | RCC-M M3304 Nuclear Power Grade Austenitic Stainless Steel Pipe |
| Grade | 18-10 steel not containing Mo: Z6CN18-10, Z5CN18-10, Z2CN18-10, Z2CN19-10 (Controlled Nitrogen Content) 18-10 steel containing Mo: Z6CND17-12, Z5CND17-12, Z2CND17-12, Z2CDN18-12 (Controlled Nitrogen Content) |
| Delivery Condition | HFD: Hot finished heat treated, descaled |
| MFG. Methods | Hot-Rolled/Hot Expanding |
| Density | 7.93 – 7.98g/cm³ |
| Dimension | OD: 10.3 – 914mm WT: 1 – 50mm L: 6000-12000mm |
| Dimension & Tolerance | EN ISO 1127:2019 |
| Inspection Certificate | EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection) |
| Tests | Chemical Analysis, Tensile Test, Flattening Test, KV impact for wall thickness ≥ 12 mm, Visual & Dimensional Inspection, NDT |
Packing
Small diameter packed in plywood box; large diameter packed on plywood pallets.
Applications
Primary Coolant Piping Systems:
Role: These pipes are part of the reactor’s primary coolant system, which is responsible for transferring heat away from the reactor core.
Importance: The pipes must withstand high temperatures, pressures, and radiation levels without corroding or degrading, ensuring the safe operation of the reactor.
Reactor Pressure Vessel (RPV) Connections:
Role: Austenitic stainless steel pipes are used to connect various components to the reactor pressure vessel, including nozzles and coolant inlet/outlet connections.
Importance: The materials must maintain their integrity under the severe conditions of the reactor, preventing leaks or failures that could compromise the reactor’s safety.
Steam Generator Tubing:
Role: In pressurized water reactors (PWRs), these pipes are used in the steam generator, where heat from the primary coolant is transferred to the secondary loop to produce steam.
Importance: The austenitic stainless steel must resist corrosion from both the primary coolant and the water in the secondary loop, ensuring efficient heat transfer and preventing contamination.
Control Rod Drive Mechanisms (CRDM) Housings:
Role: These pipes form part of the housing for control rod drive mechanisms, which are critical for controlling the nuclear reaction within the reactor core.
Importance: The material’s resistance to stress corrosion cracking and other forms of degradation ensures that the control rods can be reliably inserted and withdrawn to regulate the reactor’s power output.
Pressurizer Surge Lines:
Role: These pipes connect the pressurizer to the primary coolant system, helping to maintain system pressure within safe limits.
Importance: The pipes must handle the cyclic thermal loads and high pressures typical of this application without cracking or fatigue failure.
Heat Exchanger and Condenser Tubing:
Role: Austenitic stainless steel pipes are used in heat exchangers and condensers, where they transfer heat between fluids without mixing them.
Importance: The material’s resistance to thermal fatigue and its ability to maintain structural integrity at elevated temperatures ensure long-term reliability in these heat transfer applications.
Feedwater and Condensate Piping Systems:
Role: These systems are responsible for supplying water to the steam generator and for returning condensed steam back to the system.
Importance: Austenitic stainless steel pipes in these systems must resist corrosion from water, steam, and chemicals used in water treatment, ensuring the continued efficiency and safety of the steam cycle.
Containment Penetrations:
Role: These pipes penetrate the containment structure, providing pathways for coolant, steam, and control systems while maintaining the integrity of the containment barrier.
Importance: The pipes must resist radiation, heat, and pressure, ensuring that the containment barrier remains intact in all operating conditions, including accident scenarios.
