GB/T18984-2003 standard suitable for -49 to -148 degrees F cryogenic pressure vessel piping, and low-temperature heat exchanger tubes seamless steel pipe.
(Not more than 25 mm) outside diameter and wall thickness of the steel pipe shall conform to GB/T 17395-1998 Table 1 provisions. According to the requirements of the demand side, the supply and demand sides consultation, produce the provisions specifications steel pipe.
The pipe diameter (D) and wall thickness (S) tolerances shall comply with the requirements in Table 1.
Process | Size(mm) | Tolerance | |
Hot-rolled | O.D. | <351 | +/-1.0% D(+/-0.50min) |
>=351 | +/-1.25% D | ||
W.T. | <=25 | +/-12.5% S(+/-0.40 min) | |
Cold drawn | O.D. | <=30 | +/-0.20 |
30-50 | +/-0.30 | ||
>50 | +/-0.75% D | ||
W.T. | <=3 | +12.5% S, -10% S | |
>3 | +/-10% S | ||
Note:
Outside diameter greater than or equal to 351 thermal Flaring wall thickness allowable deviation: Guests 15 write S
Grade | C | Si | Mn | P(max) | S | Ni | Mo | V |
16MnDG | 0.12-0.20 | 0.20-0.55 | 1.20-1.60 | 0.025 | 0.025 | - | - | - |
10MnDG | <=0.13 | 0.17-0.37 | <=1.35 | 0.025 | 0.025 | - | - | <=0.07 |
09DG | <=0.12 | 0.17-0.37 | <=0.95 | 0.025 | 0.025 | - | - | <=0.07 |
09Mn2VDG | <=0.12 | 0.17-0.37 | <=1.85 | 0.025 | 0.025 | - | - | <=0.12 |
06Ni3MoDG | <=0.08 | 0.17-0.37 | <=0.85 | 0.025 | 0.025 | 2.5-3.7 | 0.15-0.30 | <=0.05 |
Grade | Tensile strength | Lower yield strength（Rcl/Mpa） | Elongation | |
Rm/Mpa | W.T.<=16mm | W.T.>16mm | A/% | |
16MnDG | 490-665 | >=325 | >=315 | >=30 |
10MnDG | >=400 | >=240 | >=35 | |
09DG | >=385 | >=210 | >=35 | |
09Mn2VDG | >=450 | >=300 | >=30 | |
06Ni3MoDG | >=455 | >=250 | >=30 | |
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