GB/T18984 06Ni3MoDG Low Temperature Seamless Steel Pipe
Standard:GB/T18984-2003
GB/T18984 06Ni3MoDG steel pipe applies to -100 ° C grade low temperature pressure vessel pipelines and seamless steel tubes for low temperature heat exchanger pipelines
GB/T18984 06Ni3MoDG low temperature seamless steel pipe Quick Details
Company Name: EZ steel pipe
Country/Region: China
Material:06Ni3MoDG
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
GB/T18984 06Ni3MoDG seamless steel pipe Dimensional Range & Specification
Outside Diameter:12.7mm--219mm
Wall thickness:3.5mm--12.7mm
Length:6000mm,12000m or specified length as required.
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 |
Note: Outside diameter greater than or equal to 351 thermal Flaring wall thickness allowable deviation: Guests 15 write S
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 06Ni3MoDG seamless steel pipe
| Standard |
Grade |
C |
Si |
Mn |
P(max) |
S |
Ni |
Mo |
V |
| GB/T18984 |
06Ni3MoDG |
<=0.08 |
0.17-0.37 |
<=0.85 |
0.025 |
0.025 |
2.5-3.7 |
0.15-0.30 |
<=0.05 |
Longitudinal Mechanical Properties of GB/T18984 06Ni3MoDG seamless steel pipe
| Standard |
Grade |
Tensile strength |
Lower yield strength(Rcl/Mpa) |
Elongation |
| Rm/Mpa |
W.T.<=16mm |
W.T.>16mm |
A/% |
| GB/T18984 |
06Ni3MoDG |
>=455 |
>=250 |
>=30 |
Minimum impact test temperature of GB/T18984 06Ni3MoDG seamless steel pipe
|
Grade
|
Minimum impact test temperature
|
|
ºF
|
ºC |
|
06Ni3MoDG
|
--
|
-100
|
Performance Testing:
Hydraulic test
Flattening test
Bending test
Flaring test
Low-order tissue test
Use the grade 06Ni3MoDG steel shall be inspected at low magnification. There shall be no visible white spots, inclusions, subcutaneous bubbles, tumbling and delamination on the cross-section acid immersion test piece.
Non-metallic inclusion inspection
Steel pipes made of grades 06Ni3MoDG steel shall be inspected for non-metallic inclusions.
Nondestructive testing
Steel pipes made of grades 06Ni3MoDG steel shall be ultrasonically tested one by one. The longitudinal notch groove depth of the outer surface of the comparative sample tube of cold drawn (rolled) steel pipe shall comply with the provisions of C8 of GB / T 5777, and the depth of the longitudinal notch groove of the outer surface of the comparative sample tube of hot rolled (expanded) steel pipe shall comply with GB / T 5777 C10 regulations.
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.
Delivery: 7-15 days after payment
Audited Supplier 
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