A53 Carbon Steel Welded Pipe

Product Description

Common materials and chemical compositions of carbon steel welded pipes

GradeLevelChemical Composition,%Deoxygenation Method
CMnSiSP
No greater than
Q195-0.06~0.120.25~0.500.300.0500.045F、b、Z
Q215A0.09~0.150.25~0.550.300.0500.045F、b、Z
B0.045
Q235A0.14~0. 220.30~0.650.300.0500.045F、b、Z
B0.12~0.200.30~0.700.045
C≤ 0.180.35~0.800.0400.040Z
D≤ 0.170.0350.035TZ
Q255A0.18~0.280.40~0.700.300.0500.045F、b、Z
B0.045
Q275-0.28~0.380.50~0.800.350.0500.045b、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.

1. Chemical Composition of A53 Carbon Steel Pipe (Weight Percentage)

A53 steel is divided into Grade A and Grade B, with the following composition requirements:



Element Grade A (Max) Grade B (Max)



Carbon (C) 0.25% 0.30%

Manganese (Mn) 0.95% 1.20%

Phosphorus (P) 0.05% 0.05%

Sulfur (S) 0.045% 0.045%

Silicon (Si) Not specified Not specified

Copper (Cu) ≥0.40% (if added) ≥0.40% (if added)

Notes:

Carbon Equivalent (CE) formula (for Grade B welded pipes only):
CE=C+Mn6+Cr+Mo+V5+Ni+Cu15≤0.50%CE=C+6Mn+5Cr+Mo+V+15Ni+Cu≤0.50%

Residual elements (e.g., chromium, nickel) are not strictly regulated but must meet mechanical performance requirements.

2. Mechanical Properties

2.1 Tensile Properties



Property Grade A Grade B



Tensile Strength (σ₆) ≥330 MPa (48 ksi) ≥415 MPa (60 ksi)

Yield Strength (σₛ) ≥205 MPa (30 ksi) ≥240 MPa (35 ksi)

Elongation (50mm gauge) ≥25% ≥23%

2.2 Other Requirements

Flattening Test (seamless/welded pipes): No cracks until the inner wall spacing reaches 2/3 of the pipe diameter.

Bend Test (welded pipes): Mandrel diameter = 6× pipe diameter; no cracks.

Hardness: Not specified, typical Brinell Hardness (HB) ranges:
Grade A: ≤140 HB | Grade B: ≤160 HB.

3. Applications

Grade A: Low-pressure fluid transport (water, gas), general structural support.

Grade B: Medium/high-pressure fluid transport (steam, oil), mechanical components, and pressure pipelines.

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 		  NameIntroduce
GB/T3640-88Ordinary 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.
YB242-63Straight seam electric welded steel pipeIt 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.
SY5036-83Spiral seam submerged arc welded steel pipe for pressurized fluid transportationIt 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.
SY5038-83Spiral seam high frequency welded steel pipe for pressurized fluid transportationIt 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/T5037-2000Spiral seam submerged arc welded steel pipe for general low pressure fluid transportationIt 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.
SY5039-83Spiral seam high frequency welded steel pipe for general low pressure fluid transportationIt 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.
SY5040-83Spiral welded steel pipes for pilesIt 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
Bao 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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Company Profile

BAOSTEEL Co., Ltd is a comprehensive company, who is founded in 2008. Specialized in Carbon steel, alloy steel, galvanized steel in pipe and tube,plate and coil,profiles.

We are located in Tianjin Province, the Steel base of China, It is well-known all over the world. We are close to Tianjin Seaport, that is much convenient in carriage.

We welcome all users, manufacturers and traders to cooperate with us

Since our establishment, we have always adhered to the business policy of "Quality for Survival, Product for Development, Credibility for Cooperation and Service for Customer". Under the guidance of this business policy, our company acts as a perennial distributor of steel pipe, steel plate, steel coil, steel rod, steel profiles of Angang Steel, HBIS, JISCO,SGHB ,and etc.

Modern large-scale outdoor storage and indoor storage have been set up in our company, and 20,000 tons of available goods have been prepared.

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Pre-sale Service

1.We provide samples free of charge, but the freight should be paid by the buyer.
2. We have full stock,and can deliver within short time.Many styles for your choices. 
3. OEM and ODM order are accepted, Any kind of logo printing or design are available.
4. Good Quality + Factory Price + Quick Response + Reliable Service, is what we are trying best to offer you.
5. All of our products are produce by our professional workman and we have our high-work-effect
foreign trade team, you can totally believe our service. 

After you choose

1. We will count cheapest shipping cost and make invoice to you at once.
2. Check quality again, then send out to you at 1-2 working day after your payment,
3. Email you the tracking no, and help to chase the parcels until it arrive you.

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1. We are very glad that customer give us some suggestion for price and products.
2. If any question,please contact with us freely by E-mail or Telephone.

FAQ

Q1:Can you send samples?
A:Of course, we can provide customers with free samples and express shipping service to all over of the world.

Q2:What product information do I need to provide?
A:Please kindly provide the grade, width, thickness, surface treatment requirement should you have and quantities you need to purchase. 

Q3:It's my first time to import steel products, can you help me with it?
A:Sure,we have agent to arrange the shipment, we will do it together with you.

Q4:What ports of shipment are there?
A:Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao, Ningbo ports, you can specify other ports according to your needs. 

Q5:What about product prices information?
A:Prices various according to periodic price changes of raw materials. 

Q6:What is your terms of payment ?
A:Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shipment or based on BL copy or LC at sight.

Q7.Do you provide custom made Products service?
A: Yes,if you have your own design , we can produce according to your specification and drawing.

Q8:What are the certifications for your products?
A:We have ISO 9001, MTC, third parties’ inspections are all available such SGS, BV ect.

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