Seamless Tubing, Couplings Hydrosulfide-Carbon Dioxide, Cold-Resistant tube
The general corrosion rate for metal of tubing, couplings and strengthened connection parts is not more than 0.5 mm/year.
The tubes are manufactured in version A per GOST 633-80.
In coordination with client the tubes can be manufactured with the length up to 11 meters.
The tubes and couplings are manufactured from tube shell made from steel 30 FB, 30 KhF and 30 KhMFBA.
- The tubing is made in two versions:
- 1. Plain tubes with couplings per GOST 633-80;
- 2. Tubes completed with strengthened connection parts.
The range of tubing with couplings is specified by Table 1.1.
DN (nominal diam.) of pipe, mm
|
Tube wall thickness, mm
|
Tube type
| |
Plain, without thread
|
Plain, with triangular thread
| ||
60
|
5,0
|
Ks, Es, Ls
|
Ks, Es, Ls
|
73
|
5.5 : 7.0
|
Ks, Es, Ls
|
Ks, Es, Ls
|
The range of tubing with strengthened connection parts is specified by Table 1.2.
Tube type
|
DN (nominal diam.),
mm |
Tube wall thickness,
mm |
Outside Diameter of coupling and sub,
mm |
Plain as per
GOST 633-80 |
60
73 89 |
5.0
5.5 : 7.0 6.5 : 8.0 6,5 7.0 |
73.0
88.9 108.0 120.6 132.1 |
In coordination with client the tubes can be manufactured with the length up to 11 meters.
The tubes and couplings are manufactured from tube shell made from steel 30 FB, 30 KhF and 30 KhMFBA.
Mechanical properties of tubes and couplings are specified by Table 1.3.
Parameter description
|
Nominal value of parameter for steel of strength group:
| ||
Кs
|
Еs
|
Ls
| |
Tensile strength, σt,
N/mm2(kgf/mm2), not less than |
647 (66)
|
657 (67)
|
755 (77)
|
Yield strength, σy,
N/mm2(kgf/mm2), not less than not more than |
519 (53)
627 (64) |
549 (56)
657 (67) |
647 (66)
784 (80) |
Ratio σy/σt,
not more than |
0,8
|
0,85
|
0,85
|
Rockwell hardness,
not more than |
95 HRB
|
98 HRB
|
98 HRB
|
Elongation, δ5, %,
not less than |
18
|
16
|
15
|
Impact strength at Charpy specimens,
J/cm2(kgcm/mm2), at test temperature -50°C not less than KCV-50°C. |
98(10)
|
98(10)
|
98(10)
|
Share of ductile component (V) at test temperature -50°C %,
not less than |
70
|
70
|
70
|
- The tubing per this TU is completed with wear-resistant connection parts (interlocks).
- The couplings and subs of wear-resistant interlocks are fabricated from steel 40 Kh, 40 KhFBA, and 40 KhMFBA and subjected to ionic nitride hardening procedure. Using of interlocks provides increased service life of threaded connections.
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