Power Tubes & Piping-Tsisco

Power Tubes & Piping

1) Overview

Nuclear power plant tubes & pipes are designed for reactors, steam generators, heat exchangers, and auxiliary systems, meeting stringent requirements of high strength, high-temperature & pressure resistance, radiation resistance, corrosion resistance, and long service life.
They are widely used in primary circuit, secondary circuit, nuclear island, and conventional island piping systems.

2) Manufacturing Process
   •   Melting: VIM, ESR, VAR refining
   •   Forming: hot rolling/extrusion → cold drawing/rolling
   •   Heat treatment: solution annealing, quenching & tempering
   •   Surface: pickling, BA, electro-polishing (EP)
   •   Ends: cutting, beveling, expanding, U-bending

3) Key Features
   •   High temperature & pressure resistance: service up to 350–650℃
   •   Superior corrosion resistance: chloride SCC, pitting & crevice corrosion
   •   Radiation resistance: suitable for nuclear environments
   •   High purity: low inclusion, vacuum degassed
   •   Stabilized grades: intergranular corrosion resistance
   •   Long lifetime: designed for 40–60 years service

4) Standards
   •   ASME / ASTM: ASTM A213, ASTM A312, ASTM B163/B167/B407/B423
   •   ASME BPVC: Boiler & Pressure Vessel Code
   •   RCC-M: French nuclear code
   •   China NB/GB: GB 5310, NB/T 20001 series

5) Grades
   •   Stainless steels: TP304/304L, TP316/316L, TP321, TP347H
   •   Nickel alloys: Alloy 600, 690, 800, 825
   •   Titanium alloys: seawater cooling systems
   •   Low-alloy steels: 15CrMo, 12Cr1MoV (conventional island)

6) Applications
   •   Reactor circuits: main coolant lines, pressurizers
   •   Steam generators: U-bent heat exchanger tubes
   •   Heat exchangers: condensers, feedwater heaters
   •   Nuclear island systems: safety injection, residual heat removal
   •   Conventional island: boiler tubes, turbine piping

7) Quality & Testing
   •   Chemical analysis: spectrometry, ICP
   •   Mechanical: tensile, impact, hardness, creep
   •   Corrosion: intergranular, pitting, chloride SCC
   •   NDT: eddy current, ultrasonic, X-ray
   •   Hydro/pneumatic tests: 100% tubes
   •   Third-party: ASME, RCC-M, HAF604, SGS, TÜV, DNV

8) Supply & Packaging
   •   Forms: hot rolled, cold drawn/rolled, U-bent tubes
   •   Sizes: OD 6–660 mm, WT 0.5–60 mm
   •   Ends: plain, beveled, protected
   •   Packaging: vacuum film + end caps + wooden cases
   •   Documents: MTC (EN 10204 3.1/3.2), nuclear QA/QC docs

9) Ordering Guide
   •   Material/Standard (e.g. Alloy 690 / ASTM B163 / RCC-M)
   •   Dimension (OD × WT × L)
   •   Surface finish (pickled / BA / EP)
   •   Testing (NDT, leak test, corrosion, 3rd-party witness)
   •   Packaging level (standard / nuclear-grade vacuum pack)

10) Why Us
   •   Nuclear-qualified: ASME, RCC-M, HAF604 compliance
   •   Full material coverage: stainless, nickel alloys, titanium
   •   Advanced refining: VIM + ESR + VAR for purity
   •   Full QC traceability: melt → billet → tube → test → docs
   •   Reliable delivery: supporting major NPP projects worldwide

Nuclear Tubes & Pipes | Grades, Dimensions & Applications

1) Grades
   •   Austenitic Stainless Steels: 304/304L, 316/316L, 321, 347H
   •   Nickel Alloys: Inconel 600, Alloy 690, Alloy 800/825
   •   Titanium Alloys: Gr.2, Gr.7, Gr.12
   •   Low-Alloy Steels: 15CrMo, 12Cr1MoV

2) Dimensions
   •   OD: 6 mm – 660 mm
   •   WT: 0.5 mm – 60 mm
   •   Length: up to 18,000 mm (straight), up to 25,000 mm (U-bent tubes)
   •   Forms: straight tubes, U-bent tubes, coils

3) Applications
   •   Primary Circuit: main coolant lines, pressurizers (316L, Alloy 690)
   •   Steam Generators: U-bent heat exchanger tubes (Alloy 690, Alloy 800)
   •   Secondary Circuit: feedwater heaters, condensers, drainage systems (304L, 316L, titanium)
   •   Auxiliary Systems: safety injection, residual heat removal (304/316 SS)
   •   Conventional Island: boiler tubes, turbine piping (15CrMo, 12Cr1MoV)

4) Key Highlights
   •   Strict standards: ASME BPVC, RCC-M, HAF604 compliance
   •   Long service life: 40–60 years design
   •   Complete QC: 100% NDT, hydro/pneumatic test, helium leak test optional

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