TORICH GB/T3091 Q195 Welded Steel Pipes For Low Pressure Liquid Delivery

sizes:

O.D : 21mm-660mm W.T : 0.6mm-18mm 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