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Seamless steel pipe

GB6479 standard seamless steel pipe

Type:Seamless Steel Pipe

Processing Service:Welding,Punching,Cutting

Alloy Or Not:Alloy

Tolerance:±5%

Material:carbon/alloy

Section Shape:Round

  • Product Detail

GB6479
High-pressure seamless steel pipe for fertilizer equipment (GB6479-2013) is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines with a working temperature of -40~400℃ and a working pressure of 10~30Mpa. GB6479 steel pipe is mainly used for seamless steel pipe for high pressure fertilizer equipment and pipeline. It represents the material of 20#, Q345B grade steel.


basic introduction
Chinese name : GB6479
外文名:Seamless steel tubes for high-pressure chemical fertilizer equipments
Designation and Steel Grade :: 20# Q345B/C/D/E
Executive standard : GB6479-2013, ASTM DIN JIS
Product name : : Seamless steel pipe for high pressure fertilizer
The main purpose
GB6479 steel pipe is mainly used for seamless steel pipe for high pressure fertilizer equipment and pipeline.
Executive standard
Product name: Seamless steel pipe for high pressure fertilizer
Executive standard: GB6479-2013, ASTM DIN JIS
Grades and Steel Grades:
10、20、Q345B/C/D/E、12CrMo、15CrMo、12Cr2Mo、12Cr5Mo、10MoWVNb、12SiMoVNb
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chemical composition test
(1) GB3087-2008 "Seamless Steel Tubes for Low and Medium Pressure Boilers". The chemical composition test method is in accordance with the relevant parts of GB222-84 and GB223 "Chemical Analysis Methods of Iron and Steel and Alloys".
(2) GB5310-2008 "Seamless Steel Tubes for High Pressure Boilers" stipulates. The chemical composition test method is in accordance with the relevant parts of GB222-84 and "Methods for Chemical Analysis of Iron and Steel and Alloys" and GB223 "Methods for Chemical Analysis of Iron and Steel and Alloys".
(3) The chemical composition inspection of imported boiler steel pipes shall be carried out according to the relevant standards stipulated in the contract.
Physical property inspection
(1) GB3087-2008 "Seamless Steel Tubes for Low and Medium Pressure Boilers". Tensile test according to GB/T228-87, hydraulic test according to GB/T241-90, flattening test according to GB/T246-97, flaring test according to GB/T242-97, cold bending test according to GB244-97.
Steel pipe weight calculation formula: [(outer diameter-wall thickness)*wall thickness]*0.02466=kg/meter (weight per meter)
GB6479 steel pipe size and allowable deviation
Deviation level
Standardized outer diameter tolerance
D1
±1.5% , min.±0.75 mm
D2
±1.0% . Min ±0.50 mm
D3
±0.75% .Minimum ±0.30 mm
D4
±0.50% . Minimum ±0.10 mm
expand
GB/T14980-1994 (large diameter electric welded steel pipe for low pressure fluid transportation). Boiler tubes are mainly used to transport low-pressure fluids such as water, sewage, gas, air, heating steam and other purposes. It represents the material Q235A grade steel.
Boiler tubes are made of steel
(1) High-quality carbon structural steel grades are 20G, 20MnG, and 25MnG.
(2) Alloy structural steel grades 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.
(3) The commonly used 1Cr18Ni9 and 1Cr18Ni11Nb boiler tubes with rust and heat-resistant steels should be subjected to hydrostatic tests, flaring and flattening tests one by one in addition to ensuring chemical composition and mechanical properties. Steel pipes are delivered in heat-treated condition.
In addition, there are certain requirements for the microstructure, grain size and decarburization layer of the finished steel pipe.

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