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Carbon Steel Welded Pipe

Welded steel pipe, also known as welded pipe, is a steel pipe made of steel plate or strip steel after crimping and welding. Large-diameter or thicker welded pipes are generally made of steel billets directly, while small welded pipes and thin-walled welded pipes are generally made of steel strips directly welded. The production process of welded steel pipe is simple, the production efficiency is high, and there are many varieties and specifications. Ganghua Steel produces carbon steel pipes of various specifications and uses, and supports customization. We have experienced technicians and a complete production line, which can meet most of the requirements of customers for products. You can contact us via the contact details on the website for more information.

Common materials and chemical compositions of carbon steel welded pipes

Grade	Level	Chemical Composition,%					Deoxygenation Method
		C	Mn	Si	S	P
				No greater than
Q195	-	0.06~0.12	0.25~0.50	0.30	0.050	0.045	F、b、Z
Q215	A	0.09~0.15	0.25~0.55	0.30	0.050	0.045	F、b、Z
	B				0.045
Q235	A	0.14~0. 22	0.30~0.65	0.30	0.050	0.045	F、b、Z
	B	0.12~0.20	0.30~0.70		0.045
	C	≤ 0.18	0.35~0.80		0.040	0.040	Z
	D	≤ 0.17			0.035	0.035	TZ
Q255	A	0.18~0.28	0.40~0.70	0.30	0.050	0.045	F、b、Z
	B				0.045
Q275	-	0.28~0.38	0.50~0.80	0.35	0.050	0.045	b、Z

Classification of welded steel pipes

Classification according to the form of weld:
Straight seam welded pipe and spiral welded pipe

Classification by production process:
Arc Welded Pipe, Electric Resistance Welded Pipe, High Frequency/Low Frequency Gas Welded Pipe, Furnace Welded Pipe

Classified by section shape:
(1) Simple section steel pipes - round steel pipes, square steel pipes, oval steel pipes, triangular steel pipes, hexagonal steel pipes, diamond steel pipes, octagonal steel pipes, semi-circular steel pipes, and others.
(2) Steel pipes with complex sections - unequal hexagonal steel pipes, five-petal plum-shaped steel pipes, double-convex steel pipes, double-concave steel pipes, melon-shaped steel pipes, conical steel pipes, corrugated steel pipes, case steel pipes, and others.

Classification by wall thickness:
Thin-walled steel pipe, thick-walled steel pipe.

Classification by use:

General welded pipe: used to transport low pressure fluids. It is mainly made of Q195A, Q215A, Q235A steel, and can also be made of other mild steels that are easy to weld.

Galvanized welded pipe: In order to improve the corrosion resistance of steel pipes, general steel pipes (black pipes) are galvanized. Galvanized steel pipes are divided into two types: hot-dip galvanizing and electro-galvanizing. The hot-dip galvanizing layer is thick and the cost of electro-galvanizing is low.

Oxygen-blown welded pipe: used as a steel-making oxygen-blown pipe, generally small-diameter welded steel pipes. Made with 08, 10, 15, 20 or Q195-Q235 steel strip. In order to prevent corrosion, some are aluminized.

Wire casing: that is, ordinary carbon steel electric welded steel pipe, used in concrete and various structural power distribution projects. The walls are thin, and most of them are used after coating or galvanizing.

Metric welded pipe: It is made by hot and cold strip welding of ordinary carbon steel, high-quality carbon steel or general low-alloy steel, or welded by hot strip and then cold drawn.

Roller tube: It is used for electric welded steel pipe of belt conveyor idler, generally made of Q215, Q235A, B steel and 20 steel. There are certain requirements for the curvature of the tube, the end face should be perpendicular to the center line, and the ovality.

Transformer tube: used to manufacture transformer radiator tubes and other heat exchangers, made of ordinary carbon steel.

Electric welding thin-walled tube: mainly used for making furniture, toys, lamps, etc.

Special-shaped pipe: square pipe, rectangular pipe, hat-shaped pipe, hollow rubber steel door and window steel pipe welded by ordinary carbon structure steel and 16Mn steel strip, mainly used for agricultural machinery parts, steel windows and doors, etc.

Spiral welded pipe: It is made by rolling a low carbon carbon structural steel or low alloy structural steel strip into a tube blank at a certain helical angle (forming angle), and then welding the pipe seams. Steel produces large diameter pipes. Spiral welded pipes are mainly used for oil and natural gas transmission pipelines, and their specifications are expressed by outer diameter * wall thickness. Spiral welded pipes are single-sided and double-sided.

In addition, there are scaffolding pipes, automobile pipes, deep well pump pipes, Mine fluid conveying welded steel pipe, low pressure fluid conveying galvanized welded steel pipe, belt conveyor idler electric welded steel pipe, etc.

Welded steel pipe classification supplement

Standard	Name	Introduce
GB/T3640-88	Ordinary carbon steel wire sleeve	It is a steel pipe used to protect electric wires in electrical installation projects such as industrial and civil buildings, installation of machinery and equipment, etc.
YB242-63	Straight seam electric welded steel pipe	It is a steel pipe with the weld seam parallel to the longitudinal direction of the steel pipe. Usually divided into metric electric welded steel pipe, electric welded thin-walled pipe, transformer cooling oil pipe and so on.
SY5036-83	Spiral seam submerged arc welded steel pipe for pressurized fluid transportation	It is a spiral seam steel pipe made of hot-rolled steel strip coils as tube blanks, often formed by warm spirals, welded by double-sided submerged arc welding, and used for conveying pressurized fluids. The steel pipe has strong pressure bearing capacity and good welding performance. After various strict scientific inspections and tests, it is safe and reliable to use. The diameter of the steel pipe is large, the transportation efficiency is high, and the investment in laying pipelines can be saved. Mainly used for pipelines for transporting oil and natural gas.
SY5038-83	Spiral seam high frequency welded steel pipe for pressurized fluid transportation	It is a spiral seam high-frequency welded steel pipe used for pressurized fluid transportation, which is made of hot-rolled steel strip coils as tube blanks, often formed by warm spirals, and welded by high-frequency lap welding. The steel pipe has strong pressure bearing capacity and good plasticity, which is convenient for welding and processing. After various strict and scientific inspections and tests, it is safe and reliable to use. Mainly used for laying pipelines for transporting oil, natural gas, etc.
SY/T5037-2000	Spiral seam submerged arc welded steel pipe for general low pressure fluid transportation	It is a submerged arc welded steel pipe for general low-pressure fluid transportation such as water, gas, air and steam, which is made of hot-rolled steel strip coils as tube blanks, often formed by warm spirals, and made by double-sided automatic submerged arc welding or single-sided welding.
SY5039-83	Spiral seam high frequency welded steel pipe for general low pressure fluid transportation	It is made of hot-rolled steel coils as tube blanks, which are often formed by warm spirals, and are welded by high-frequency lap welding for general low-pressure fluid transportation.
SY5040-83	Spiral welded steel pipes for piles	It is made of hot-rolled steel strip coils as tube blanks, often formed by warm spirals, and made of double-sided submerged arc welding or high-frequency welding. It is used for foundation piles such as civil construction structures, wharfs, and bridges.

Application of Welded Steel Pipe

Products are widely used in water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction.
For liquid transportation: water supply, drainage. For gas transportation: gas, steam, liquefied petroleum gas.
For structure: for piling pipe, for bridge; for wharf, road, building structure, etc.

Epilogue

Ganghua Steel focuses on the production of steel products, providing you with high-quality welded steel pipes, seamless steel pipes and other products and high-quality services, and looking forward to becoming a forever partner with you! We have experienced technicians and a complete production line, which can provide services such as cutting and product customization. Welcome to communicate with us!

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