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GB/T 3091 Low Pressure Liquid Delivery Galvanized Welded Steel Tube , ERW SAWL SAWH Steel Tubes

Minimum Order Quantity : 1 Ton/Tons Price : US $500 - 900 / Ton
Packaging Details : packing in hexagonal bundles or wooden boxes Delivery Time : 5-6 weeks
Payment Terms : D/A, D/P, L/C, T/T, Western Union, MoneyGram Supply Ability : 25000 Ton/Tons per Year
Place of Origin: Zhejiang, China (Mainland) Brand Name: Torich
Certification: ISO9001:2008 ISO14001:2008 Model Number: GB/T 3091

Detail Information

Name: GB/T 3091 Low Pressure Liquid Delivery Welded ERW SAWL SAWH Steel Tubes Standard: GB/T 3091
Surface: Galvanized Usage: Low Pressure Liquid Delivery
Technique: ERW,SAWL,SAWH OD: 3-420mm
WT: 0.5-50mm Length: 3-12m
High Light:

welding steel tubing

,

electric resistance welded steel tube

Product Description

product name:

GB/T 3091 Low Pressure Liquid Delivery Welded ERW SAWL SAWH Steel Tubes

 

sizes:

O.D : 5mm-420mm W.T : 0.5mm-50mm Length:3000mm-12000mm

 

Steel material:

Q195,Q215,Q215B,Q235A,Q235B,Q235,Q345,Q345B

 

Zinc coating:

100-500g if galvanized

 

Application:

Carbon steel pipe use for construction ,building filed , low pressure liquid, water, gas, oil, line pipe

 

Surface Treatment:

Galvanized,Oiled,Black Painted (varnish coating),corrosion resistant coating, Anti corrosion coating

 

Technique:

Electronic Resistance Welded (ERW ) SAW Submerged-arc Welded Helical(SAWH) Submerged-arc Welded Longitudinal(SAWL)

 

Material: Fully killed steel, Fine grain steel with a ferritic grain size.

 

Apperance and General:

The weld areas are free from cracks, lack of fusion and lack of penetration
The tubes are free from external surface defects that can be detected by visual examination.

 

Straightness:

The deviation from straightness, of any tube length L, shall not exceed 0.0015L.

Deviations from Straightness over any one meter length shall not exeed 3mm.

 

Tube Manufacturing Process, route and delivery condition:

Rounte No. Manufacturing Process Manufacturing routes Delivery condition Applicable for quality
Process Symbol Starting material Forming operation TR1 TR1
1a Electric welded EW As(hot) rolled strip Cold formed(+welding) As welded X -
1b NW X -
1c NP X X
2a Normalized rolled strip As welded X -
2b NW X X
2c NP X X
3 As(hot)rolled or normalising rolled strip Cold formed(+welded)+hot stretch reduced at a controlled temperature to give a normailsed condition NR X X
4 Cold Rolled + streass relieved Cold formed(+welded) NP X X
11a

Submerged arc-welded

-Longitudinal seam

or

-helical seam

SAW:

-SAWL

-SAWH

As(hot) rolled plate or strip Cold formed(+welded) As welded X -
11b NW X -
11c NP X X
12a Normaliseing rolled plate or strip Cold formed(+welded) As welded X X
12b NW X X
12c NP X X
13a As in lines 11 or 12 Normalising formed(+welded) As welded X X
13b NW X X
13c NP X X
21 Continous welded, only for steel grades P195 and P235 with D ≤114.3mm BW As(hot) rolled strip Hot formed(+welded) As welded X -

a As wekded = no heat treatment. NP=Full pipe normalsed. NW= Normalised weld zone. NR=Normaised rolled

b For tubes of quqality TR2, only high-frequency welding, minimum frequency 100kHz,(symbol=HFW) is permited

 

 

GB/T 3091 Low Pressure Liquid Delivery  Galvanized Welded Steel Tube , ERW SAWL SAWH Steel Tubes 0

GB/T 3091 Low Pressure Liquid Delivery  Galvanized Welded Steel Tube , ERW SAWL SAWH Steel Tubes 1GB/T 3091 Low Pressure Liquid Delivery  Galvanized Welded Steel Tube , ERW SAWL SAWH Steel Tubes 2

 

QUALITY CONTROL

1~ Incoming Raw Material Inspection
2~ Raw Material Segregation to avoid steel grade mix-up
3~ Heating and Hammering End for Cold Drawing
4~ Cold Drawing and Cold Rolling, on line inspection
5~ Heat Treatment, +A, +SRA, +LC, +N, Q+T
6~ Straightening-Cutting to specified length-Finished Measuring Inspection
7~ Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc
8~ Packing and Stocking.

 

100% of our steel tubes are dimensionally checked
100% of our steel tubes are visually checked to assure they have a perfect surface condition and no surface defects.
100% eddy current test and ultrosonic test to eliminate longitudinal and transversal defects.

 

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