gnee pipe team
20# precision structural steel pipe is a high-precision steel pipe material processed by cold drawing or hot rolling.
Because the 20# precision steel pipe has no oxide layer on the inner and outer walls, can withstand high pressure without leakage, has high precision, high smoothness, no deformation in cold bending, no cracks in flaring and flattening, etc., it is mainly used to produce products for pneumatic or hydraulic components. Such as cylinders or oil cylinders, which can be seamless pipes or welded pipes. The chemical composition of precision steel pipes is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, and chromium Cr.
Brand: 20 steel pipe
Standard: GB/T 699-1999&GB/T 3639-2008
Characteristics and scope of application:
It has high cold deformation plasticity and is generally used for bending, rolling, flanging and hammer arching. It has good welding performance of arc welding and contact welding. The thickness is small during gas welding, and cracks are prone to occur on parts with strict appearance requirements or complex shapes. The cold-drawn or normalized state has better machinability than the annealed state, and is generally used to manufacture materials with low stress but high toughness requirements.
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Material
|
C%
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Mn%
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Si%
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S%
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P%
|
|
20#
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0.17-0.23
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0.35-0.65
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0.17-0.37
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≤0.035
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≤0.035
|
|
Final Supply
Condition
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Cold finished
(Hard)(BK)
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Cold drawn and stress-relieved (BK+S or + SR)
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Hardness HB
|
|||
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Parameters
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T.S
obN/mm²
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Elongation
δ5%
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T.S
obN/mm²
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Y.S
OsN/mm²
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Elongation
δ5%
|
|
|
20# (A106B, ST45, E255)
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>=550
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>=8
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>=520
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>=375
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>=12
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175
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20# round carbon steel tube
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Manufacture
method
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Cylinder ID (mm)
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Length
(m)
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Straightness
(mm/m)
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Tolerance
on ID
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Tolerance
on WT
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Roughness
(μm)
|
|
Cold drawn
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40-420
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≤16M
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0.2-0.5
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Depends on
requirement
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±8%
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0.8
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Seamless 20# precision steel pipe process flow
Tube blank--inspection--peeling--inspection--heating--perforation--pickling and passivation--grinding--lubrication and air-drying--cold rolling--degreasing--head cutting--inspection--marking- -Product packaging
Gnee Factory environment
FAQ
What is the GB pipe standard?
GB/T8162-1999 (Seamless steel pipe for structure). Mainly used for general structure and mechanical structure.
How do we trust your company?
We specialist in steel business for many years, authenticated by SGS,welcome to visit our factory.
Do you have quality control?
Yes, we have got BV.SGS certification.
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