Welded Steel Pipe

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The welded steel pipe manufacturing process encompasses several different kinds of welding techniques along with specifications from various organizations such as the AWWA or DIN. Some of the most commonly used processes to construct a Welded Steel Pipe include the DSAW and the ERW method. The specified awwa c200 welded steel pipe, takes into consideration nominal pipe diameter that is 6 Inch and Larger.construted using an electrically butt-welded straight-seam or a spiral-seam pipe for the transmission as well as the distribution of water or for use in other water system facilities.

DIN Standard 2458 applies to the welded steel pipe dimensions and the conventional masses per unit length of these pipes, keeping in accordance with the technical conditions of delivery as stipulated in DIN. The electric resistance welded steel pipe is manufactured from either cold formed steel Strip or a Coil, which has been pulled through a series of rollers and formed into a tube. This tube is then fused through an electric charge welding process longitudinally. The outer diameter for welded steel pipe sizes can be manufactured up to 24 inches. Typically the dsaw spiral pipe is used for low pressure applications. The manufacture of a dsaw welded pipe includes the performance of both an inside weld as well as an outside weld, wherein the submerged welding process is what protects the steel from contamination by the impurities present in the air.

 

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Welding steel tube is one pipe the surface has the steel pipe joint,which is use the steel belt or steel plate material through the bending deformation into round ,square ect then welded into shape.Which can meet customer requirements, the special specifications welded pipe can be processed according to user requirements. Welded pipes for conveying water, sewage, gas, air, heating, steam and other low-pressure fluid and other uses.

 

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Carbon (ERW & DSAW) Pipe

Sizes

• ERW: 3/4″ thru 26″ up to 1.000″ thick
• DSAW: 20″ thru 72″ up to 3.000″ thick
• R&W: 24″ thru 120″ up to 4.000″ thick

Specifications & Grades

• SA53 / A53 Welded — Grade B
• API 5L Welded — Grades B (X42, X52, X60, X65 and X70) PSL 1, PSL 2
• A671 / A672 in all grades

 

Carbon Spiral Weld Pipe

Sizes

• 24″ thru 120″ OD
• Wall Thickness — Up to 1.000″

Specifications & Grades

• A139/134/AWWAC200
• ASTM A252 — Grades 2 & 3

 

Chrome Moly Pipe

Sizes

• 16″ OD and Larger
• Wall Thickness — Up to 3.000″

Specifications & Grades

A691 – Grades:

• 1 ¼ Chrome (equal to P-11)
• 2 ¼ Chrome (equal to P-22)
• 91 Chrome (equal to P-91)
• 5 Chrome (equal to P-5)
• 9 Chrome (equal to P-9)

Inspection

• Mill Test Certificate: EN 10204/3.1B 
• Third party inspection: SGS, BV, Lloyds etc.

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Stainless steel pipes are really good corrosion resistance and pliability comparing with welded carbon steel pipe, meanwhile, stainless steel pipe also may ensure its weldedability as well as welded carbon steel pipe’s.

Seamless sizes	Welded sizes	Application
Out diameter: 1/4"-36"	Out diameter: 21.3mm-3620mm	API 5L, API 5CT, ASTM A53, ASTM A106,  ASTM A179, ASTM A192, ASTM A252,  ASTM A333, ASTM A335, ASTM A672 Water underground Sewage treatment Steel scaffolding Transporting oil & gas Boiler and condenser tubes High-pressure applications Chemical processing
Wall thickness:1.25mm-50mm	Wall thickness:1.65-mm-65mm
Length:3m-12m	Length:3m-12m

 

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Sets standards for coating of pipe with zinc inside and outside by the hot-dipped process. Weight of coating must not average less than 1.8 oz. per square foot and not less than 1.6 oz. per square foot.

 

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ASTM A106	for Seamless Carbon Steel Pipe for High-Temperature Service
ASTM A179	for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes
ASTM A192	for Seamless Carbon Steel Boiler Tubes for High-Pressure Service
API 5L	for use in conveying gas, water, and oil in the natural gas and oil industries, and covers seamless and welded steel line pipe.
API 5CT	for casing and tubing
ASTM A53	for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM A335	for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
DIN 17175	seamless steel pipes are used in boiler installations, high-pressure pipelines and tank construction and special machinery for both high temperature and high-pressure devices.
DIN 1629	specifies the Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements.
DIN 2391	for Cold Drawn High Precision Seamless Tube
ASTM A213	for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM A252	for Welded and Seamless Steel Pipe Piles
ASTM A333	for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications with Required Notch Toughness
ASTM A672	for Electric-Fusion-Welded Steel Pipe for High-Pressure Service at Moderate Temperatures
DIN 2458	Welded Steel Pipes in Unalloyed and Low Alloy Steels for Supply Purposes
EN 10210	Seamless steel tubes for pressure purposes
BS 1387	Black and Hot-Dipped Zinc-Coated (Galvanized) Welded Steel Pipe
EN 10255	Non-alloy Steel Tubes Suitable for Welding and Threading
JIS G3444	Carbon steel tubes for general structural purposes
JIS G3454	Carbon steel pipes for pressure service
BS 3059	Steel boiler and superheater tubes
ASTM A135	Electric-Resistance-Welded Steel Pipe
ASTM A795	Black and Hot-Dipped Zinc-Coated (Galvanized) Welded Steel Pipe

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ASTM / ASME

Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
Electric-Resistance-Welded Steel Pipes	ASTM A135	42.2-114.3 x 2.11-2.63	A
Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes	ASTM A178	42.2-114.3 x 2.11-2.63	A, C,D
ERW and Hot-dip Galvanized Steel Pipes	ASTM A53	21.3-273 x 2.11-12.7	A, B
Pipes for Piling Usage	ASTM A252	219.1-508 x 3.6-12.7	Gr2, Gr3
Tubes for General Structural Purpose	ASTM A500	21.3-273 x 2.11-12.7	Carbon Steel
Square Pipes for General Structural Purpose	ASTM A500	25 x 25-160 x 160 x 1.2-8.0	Carbon Steel

 

BS

Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
Screwed and Socketed Steel Tubes	BS 1387	21.4-113.9 x 2-3.6	Carbon Steel

 

EN

Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
Scaffolding Pipes	EN 39	48.3 x 3.2-4	Carbon Steel

 

JIS

Product Name	Executive Standard	Dimension (mm)	Steel Code / Steel Grade
Tubes for General Structure Purpose	JIS G3444	21.7-216.3 x 2.0-6.0	Carbon Steel
Tubes for Machine Structure Purpose	JIS G3445	15-76 x 0.7-3.0	STKM11A, STKM13A
Pipes for Ordinary Piping	JIS G3452	21.9-216.3 x 2.8-5.8	Carbon Steel
Pipes for Pressure Service	JIS G3454	21.7-216.3 x 2.8-7.1	Carbon Steel
Rigid Steel Conduits	JIS G8305	21-113.4 x 1.2-3.5	G16-G104, C19-C75, E19-E75
Rectangular Pipes for General Structure	JIS G3466	16 x 16-150 x 150 x 0.7-6	Carbon Steel

 

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Material	EN 10028-3	DIN 17102	NFA 36-207	UNI 7382	BS 1501	UNE 36081	ASTM
1.0486	P275N	StE 285			224 Gr. 400
1.0487	P275NH	WStE 285			224 Gr. 430		A 516 Gr. 60
1.0488	P275NL1	TStE 285					A 662 Gr. A
1.1104	P275NL2	EStE 285
1.0562	P355N	StE 355	A 510 AP	Fe E 355 KG	223 Gr. 490	AE 355 KG	A 537 CL 1
1.0565	P355NH	WSteE 355	A 510 AP	Fe E 355-2	224 Gr. 490		A 662 Gr. C
1.0566	P355NL1	TStE 355	A 510 FP 1	Fe E 355-3	224 Gr. 490		A 737 Gr. B
1.1106	P355NL2	EStE 355

 

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Germany	U.S.A
DIN 17,172	API 4L, 5L
St E 210.7	A
St E 240.7	B
St E 290, 7 (TM)	X 42
St E 320, 7 (TM)	X 48
St E 360, 7 (TM)	X 52
St E 385, 7 (TM)	X 56
St E 415, 7 (TM)	X 60
St E 445, 7 (TM)	X 65
St E 480, 7 (TM)	X 70

 

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Seamless and Electric-Resistance-Welded — Bending, flattening, tensile on one length of pipe from each lot of 500 lengths or less of a size. Continuous-Weld — Bending, flattening, tensile

NPS 1 1/2 & smaller	NPS 2 & larger
one / 25 tons	one / 50 tons

 

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Hydrostatic inspection test pressures for plain end and threaded and coupled pipe are specified. Hydrostatic pressure shall be maintained for not less than 5 seconds for all sizes of seamless and electric-resistance-weld pipe.

 

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Tensile Test — Transverse required on ERW for NPS 8 and large. Sending Test (Cold) — STD and XS-NPS 2 and under XXS-NPS 1 1/4 and under.

	Degree of Bend	Diameter of Mandrel
For Normal A53 Uses	90	12 x nom dia. of pipe
For Close Coiling	180	8 x nom dia. of pipe

Flattening Test — NPS 2 and larger STD and XS. (Not required for XXS pipe.)

 

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Steel pipes are made by two different processes. The overall production method for both processes involves three steps.First, raw steel is converted into a more workable form. Next, the pipe is formed on a continuous or semicontinuous production line. Finally, the pipe is cut and modified to meet the customer’s needs.

Ends of Pipes

For the ends of pipes are 3 standard versions available.

• Plain Ends (PE)
• Threaded Ends (TE)
• Beveled Ends (BE)

Ends are mostly be beveled to angle 30° (+ 5° / -0°) with a root face of 1.6 mm (± 0.8 mm).

 

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Piping lengths from the factory not exactly cut to length but are normally delivered as:

• Single random length has a length of around 5-7 meter
• Double random length has a length of around 11-13 meter
• Shorter and longer lengths are available, but for a calculation, it is wise, to use this standard lengths;
• other sizes are probably more expensive.

Required Markings On Each Length

(On Tags attached to each Bundle in case of Bundled Pipe)

 

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• Single Random — 16′ – 22′. 5% may be jointers. If Plain Ends — 5% may be 12′ – 16′.
• Double Random — Shortest Length 22′, minimum average for order 35′.

Extra Strong and Double Extra Strong

• Single Random — 12′ -22′. 5% may be 6′ – 12′.
• Double Random (XS and lighter) — Shortest Length 22′, minimum average for order 35′.
• Lengths longer than single random with wall thicknesses heavier than XS subject to negotiation.

 

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Plus or minus 10%

 

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Outside Diameter at any point shall not vary from standard specified more than

 

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The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.

 

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Element		Type S (seamless)		Type E		Type F
				(electric- resistance welded)		(furnace- welded pipe)
		Grade A	Grade B	Grade A	Grade B	Grade A
Carbon max. %		0.25	0.30	0.25	0.30	0.3
Manganese %		0.95	1.2	0.95	1.2	1.2
Phosphorous, max. %		0.05	0.05	0.05	0.05	0.05
Sulfur, max. %		0.045	0.045	0.045	0.045	0.045
Copper, max.%		0.40	0.40	0.40	0.40	0.4
Nickel, max. %		0.40	0.40	0.40	0.40	0.4
Chromium, max. %		0.40	0.40	0.40	0.40	0.4
Molybdenum, max. %		0.15	0.15	0.15	0.15	0.15
Vanadium, max. %		0.08	0.08	0.08	0.08	0.08

 

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	Seamless and Electric-resistance-welded		Continuous-Welded
	Grade A	Grade B
Tensile Strength, min., psi	48,000	60,000	45,000
Yield Strength, min., psi	30,000	35,000	25,000

 

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For NPS 1 1/2 and Smaller Sizes			For NPS 2 and Larger Sizes
1/64″		1/32″ under	1% over	1%under

 

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• ANSI/AWWA C104/A21.4 American National Standard for Cement-Mortar Lining for Ductile-Iron Pipe and Fittings for Water
• ISO 21809 Petroleum and natural gas industries -- External coatings for buried or submerged pipelines used in pipeline transportation systems
• DIN 30670 Polyethylen coatings of steel pipes and fittings

 

Steel Grade	BS:1387, EN10217:S185, S235,S235JR, S235 G2H, S275, S275JR, S355JRH, S355J2H, St12, St13, St14, St33, St37, St44, ST52
ASTM A 53	Gr. A, Gr B, Gr C, Gr.D
API 5L	A, B, X42, X46, X52, X56, X60, X65 X70
GB/T9711	L175, L210, L245, L290, L320, L360, L290, L320, L360, L390, L415, L450, L485, L555 GB/T3091, SY/T5037, SY/T 5040,CJ/T 3022:Q195, Q215, Q235, Q275, Q295, Q345, 08F, 08, 08AL, 08F, 10F, 10, HG5, DF08 SPHC, M8
Size	ERW, HFI, EFW
Outer Diameter	6mm-610mm (1/16"-24")
Wall Thickness	0.3mm-22mm
Length	0.5mtr-20mtr
End	square ends (straight cut, saw cut, and torch cut). or beveled for welding, beveled,

 

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