GB/T18984 16MnDG Low Temperature Seamless Steel Pipe
- GB/T18984
- China
- Stock,Production
- 16MnDG
GB/T18984 16MnDG steel pipe applies to -45 ° C grade low temperature pressure vessel pipelines and seamless steel tubes for low temperature heat exchanger pipelines
GB/T18984 16MnDG Low Temperature Seamless Steel Pipe
GB/T18984 16MnDG low temperature seamless pipe
Standard:GB/T18984-2003
Scope
This standard applies to -45 ° C ~ -100 ° C grade low temperature pressure vessel pipelines and seamless steel tubes for low temperature heat exchanger pipelines
GB/T18984 16MnDG steel pipe applies to -45 ° C grade low temperature pressure vessel pipelines and seamless steel tubes for low temperature heat exchanger pipelines
GB/T18984 16MnDG low temperature seamless steel pipe Quick Details
Company Name: Beite steel pipe
Country/Region: China
Material：16MnDG
FOB Price: US $1000-2000 / Ton | 1 Ton/Tons (Min. Order)
Port of Shipment：Tianjin,China
Payment：L/C or T/T
Delivery: 7-15 days after payment
Package：Standard export package,suit for all kinds of transport, or as required
Outside Diameter：12.7mm——219mm
Wall thickness：3.5mm——12.7mm
Length：6000mm、12000m or specified length as required.
Production method
Steel should be smelted in an oxygen converter or an electric furnace and refined outside the furnace. According to the requirements of the purchaser, it is negotiated between the supplier and the buyer and indicated in the contract. It can also be manufactured by other methods.
Steel pipes shall be manufactured by hot rolling (expansion) or cold drawing (rolling).
Delivery status
The steel pipe is delivered in a normalized state. When the finish rolling temperature is not lower than the phase transition critical temperature (Ar3), it can be regarded as normalizing treatment.
Chemical properties of GB/T18984 16MnDG Seamless Steel Pipe
| Standard | Grade | C | Si | Mn | P(max) | S | Ni | Mo | V |
| GB/T18984 | 16MnDG | 0.12-0.20 | 0.20-0.55 | 1.20-1.60 | 0.025 | 0.025 | - | - | - |
Longitudinal Mechanical Properties of GB/T18984 16MnDG Seamless Steel Pipe
|
Standard |
Grade |
Tensile strength | Lower yield strength（Rcl/Mpa） | Elongation | |
| Rm/Mpa | W.T.<=16mm | W.T.>16mm | A/% | ||
| GB/T18984 | 16MnDG | 490-665 | >=325 | >=315 | >=30 |
Minimum impact test temperature of GB/T18984 16MnDG Seamless Steel Pipe
|
Grade
|
Minimum impact test temperature
|
|
|
℉
|
℃ | |
|
16MnDG
|
--
|
-45
|
Surface Quality
The inner and outer surfaces of steel pipes shall not be folded, rolled, separated, cracked and crusted. These defects shall be completely removed and the actual wall thickness at the clearing shall not be less than the minimum allowable wall thickness.
Other local defects where the depth does not exceed the negative deviation of the wall thickness of the steel tube are allowed to exist.
Tolerances of outer diameter (D) and wall thickness (S) of steel pipe
| 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 | ||
Performance Testing:
Hydraulic test
Flattening test
Bending test
Flaring test
Low-order tissue test
Non-metallic inclusion inspection
Nondestructive testing
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