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

TORICH INTERNATIONAL CO.,LTD
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TORICH INTERNATIONAL CO.,LTD
City: Ningbo
Province/State: Zhejiang
Country/Region: China
Contact Person:Mr Richard SHEN

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

Brand Name : Torich
Model Number : GB/T 3091
Certification : ISO9001:2008 ISO14001:2008
Place of Origin : Zhejiang, China (Mainland)
MOQ : 1 Ton/Tons
Price : US $500 - 900 / Ton
Payment Terms : D/A, D/P, L/C, T/T, Western Union, MoneyGram
Supply Ability : 25000 Ton/Tons per Year
Delivery Time : 5-6 weeks
Packaging Details : packing in hexagonal bundles or wooden boxes
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
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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 ProcessManufacturing routesDelivery conditionApplicable for quality
ProcessSymbolStarting materialForming operationTR1TR1
1aElectric weldedEWAs(hot) rolled stripCold formed(+welding)As weldedX-
1bNWX-
1cNPXX
2aNormalized rolled stripAs weldedX-
2bNWXX
2cNPXX
3As(hot)rolled or normalising rolled stripCold formed(+welded)+hot stretch reduced at a controlled temperature to give a normailsed conditionNRXX
4Cold Rolled + streass relievedCold formed(+welded)NPXX
11a

Submerged arc-welded

-Longitudinal seam

or

-helical seam

SAW:

-SAWL

-SAWH

As(hot) rolled plate or stripCold formed(+welded)As weldedX-
11bNWX-
11cNPXX
12aNormaliseing rolled plate or stripCold formed(+welded)As weldedXX
12bNWXX
12cNPXX
13aAs in lines 11 or 12Normalising formed(+welded)As weldedXX
13bNWXX
13cNPXX
21Continous welded, only for steel grades P195 and P235 with D ≤114.3mmBWAs(hot) rolled stripHot formed(+welded)As weldedX-

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



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.



Product Tags:

welded steel pipe

      

welding steel tubing

      
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