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Пример поддельного документа
Tubes
|
Seamless cold-rolled channel tubes
Tubes are made of alloys of nuclear purity zirconium with niobium content of 2.5 %. Tubes are corrosion-resistant. Tubes are supplied after annealing in vacuum and etching of their outer and inner surfaces. With the purpose of obtaining the specified mechanical properties, microstructure of tube metal and other properties the tubes can be subjected to special thermo-mechanical treatment upon agreement with the customer.
Mechanical properties
Mechanical properties after annealing correspond to the data (when tested in the longitudinal direction) given in Table 1.
Table 1
| Testing temperature | Mechanical properties | ||
|
Ultimate tensile strength, N/mm2 (kgf/mm2)
not less than |
Yield strength, б0,2 N/mm2 (kgf/mm2)
not less than |
Percentage elongation
% not less than | |
| 20 °C | 392 (40) | 245 (25) | 18 |
| 350 °C | 294 (30)* | 166 (17)* | 15* |
* These requirements apply to tubes Ø88х3 mm and Ø88хØ79.5 mm in diameter. These parameters are not brought under regulation for tubes of other diameters.
Dimensions
Geometrical dimensions and the maximum deviations of tubes are specified in Table 2.
Table 2
| Outer diameter | Wall thickness | Length | |||
| nominal dimension | limit deviation | nominal dimension | limit deviation | nominal dimension | limit deviation |
| 88.0 | +0.7 -0.1 | 3.0 to 4.6 | ±0.3 | up to 8005.0 | +20.0 |
| 89.0 | +1.5 | 7.0 to 13.5 | +1.5 | up to 1950.0 | +10.0 |
The tubes are made of different sizes upon agreement with the customer, but not more than 114 mm in outer diameter, and wall thickness within 0.5 mm – 5.0 mm
Inspection
Tubes are inspected by ultrasonic flaw detector for the absence of impermissible defects on the outer, and the inner surfaces and in the thickness of the tube metal.
Total out-of-straightness of the tube generating line does not exceed:
- 2 mm for tubes with 88 mm in outer diameter;
- 3 mm for tubes with 89 mm in outer diameter.
Packaging and marking
Each tube is packed in polyethylene film or in paper, then stowed in logements and placed into a wooden or metal tare (boxes, containers). Packaging of tubes prevents them from moving inside the container, contamination, damage of the surface, and distortion of shape.
Transportation marking is performed according to GOST 14192-77 with application of manipulation signs and indications of the manufacturer, net weight, gross weight, alloy grade, number of melt (lot), the outer diameter of the tubes, and the address of the customer.
Transportation and storage
Tubes can be transported in packaged form by all types of transport. When transporting, the tubes shall be protected against mechanical damage, ingress of moisture and exposure to active chemical substances.
Tubes are stored in the packed form in the closed premises, which exclude mechanical damages of tubes, ingress of moisture onto them and the exposure to chemical substances.
Cold-rolled cladding tubes
Tubes are manufactured from nuclear purity zirconium alloys: with niobium content of 1 % (110 Alloy), and from E635 alloy. Upon agreement with the customer mass fraction of nitrogen, carbon, hydrogen, oxygen and copper in metal tubes can be determined, which shall be not more than:
- For nitrogen (N) - 60 ррм,
- For carbon (C) - 200 ррм,
- For hydrogen (H) - 15 ррм,
- For oxygen (О) – 1,000 ррм,
- For copper (Cu) - 70 ррм.
After manufacturing the tubes are annealed in vacuum, and their external and internal surfaces are etched. The tubes can be supplied in recrystallized state upon agreement with the customer. Tubes are corrosion-resistant.
Mechanical properties
Mechanical properties of the tubes during sample testing shall be not less than those specified in the Table 1.
Table 1
| Direction of the stress | ВUltimate tensile strength, MPa | Yield strength, MPa | Percentage elongation, % | |||
| 20°С | 380°С | 20°С | 380°С | 20°С | 380°С | |
| Along the tube axis | 323 | - | - | 78.4 | 40 | - |
| Across the tube axis | 272 | 145 | 204 | 127 | 28 | 33 |
Dimensions
Geometrical dimensions and the maximum deviations of tubes are given in Table 2.
Table 2
| Outer diameter | Inner diameter | Wall thickness, not less than | Out-of-roundness (ovality) * for outer diameter, not more than | ||
| Nominal | limit deviation | Nominal | limit deviation | ||
| 9.07 | ±0.05 | 7.73 | +0.06 | 0.62 | 0.04 |
| 9.10 | 0.63 | ||||
| 9.13 |
7.72
7.73 | +0.07 +0.06 | 0.62 0.63 | ||
| 9.15 |
7.72
7.73 | +0.07 +0.06 | 0.62 0.63 | ||
| 13.58 | 11.7 | +0.10 | 0.85 | 0.06 | |
* Out-of-roundness (ovality) is the difference between the maximum and minimum values of the outer diameter in every tube cross-section
Tube length is not more than 4,500 mm. Out of-straightness deviation of the tube for 500 mm length shall be not more than 0.5 mm, for the whole length of the tube it shall be not more than 1.5 mm.
Inspection
Tubes are inspected by ultrasonic and eddy current testing for the absence of impermissible defects on outer, and inner surfaces and in the thickness of tube metal
The orientation coefficient of hydrides is determined in metal of the tubes. To determine the actual size of grains the tubes can be subjected to metallographic inspection of metal microstructure on the samples in cross-section upon agreement with the customer.
Packaging and marking
Tubes are wrapped in paper, or in polyethylene film, and stowed in a wooden or metal returnable tare. Packaging of the tube prevents them from moving inside the container, contamination, damage of the surface, and distortion of shape.
Transportation marking is performed according to GOST 14192-77 with application of manipulation signs and indication of the manufacturer, net weight, gross weight, alloy grade, number of melt (lot), the dimension of the tubes, and the address of the customer.
Transportation and storage
Tubes can be transported in packaged form by all types of transport. When transporting, the tubes shall be protected against mechanical damage, ingress of moisture and exposure to chemical substances. The tubes shall be stored in packed form in closed premises. The warranty period of storage is 2 years from the date of dispatch to the consumer.