Model and Diverse Range of Welded Pipe for Your Cooperation

Model and Diverse Range of Welded Pipe for Your Cooperation

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Loading Port:: China main port

Payment Terms:: TT or LC

Min Order Qty:: 5 m.t.

Supply Capability:: 4000 m.t./month

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Product Description:

It is widely applied to line pipe and casing and tubing in oil transportation and casing field, and it is used in Low,high pressure liquid and gassy transportation and it is also good Structure pipe (for furniture, window, door, building , bridge, mechanical etc).

Standard of ERW Welded Pipes: API SPEC 5L, API SPEC 5CT, ASTM A53, GB/T9711.1

Steel Grade of ERW Welded Pipes:API SPEC 5L: B, X42, X46, X52, X56, X60, X65

API SPEC 5CT: J55, K55, N80, L80-1

ASTM A53: A, B, C

GB/T9711.1:L242、L290、L320、L360、L390、L415、L450

Sizes of ERW Welded Pipes:

Standard: GB/9711.1

Mechanical Properties

Remark: Besides below sizes, we also can arrange production based on requirement of customers

OD		WT			WEIGHT
INCH	MM	SCH	MM	INCH	KG/M	LB/INCH
1 1/2”	48.3	STD-40	3.68	0.145	4.09	2.75
1 1/2”	48.3	XS-80	5.08	0.2	5.47	3.68
2”	60.3	STD-40	3.91	0.154	5.49	3.69
2”	60.3	XS-80	5.54	0.218	7.56	5.08
2 1/2”	73	STD-40	5.16	0.203	8.72	5.86
2 1/2”	73	XS-80	7.01	0.276	11.52	7.74
3”	88.9	STD-40	5.49	0.216	11.41	7.67
3”	88.9	XS-80	7.62	0.3	15.43	10.37
3 1/2”	101.6	STD-40	5.74	0.226	13.71	9.21
3 1/2”	101.6	XS-80	8.08	0.318	18.83	12.65
4”	114.3	STD-40	6.02	0.237	16.24	10.91
4”	114.3	XS-80	8.56	0.337	22.55	15.15
5”	141.3	STD-40	6.55	0.258	21.99	14.78
5”	141.3	XS-80	9.53	0.375	31.28	21.02
6”	168.3	STD-40	7.11	0.28	28.55	19.19
6”	168.3	XS-80	10.97	0.432	42.99	28.89
8”	219.1	STD-40	8.18	0.322	42.98	28.88
8”	219.1	XS-80	12.7	0.5	65.3	43.88
10”	273	STD-40	9.27	0.365	60.9	40.92
10”	273	80	15.09	0.594	96.95	65.15
12”	323.8	STD	9.53	0.375	74.61	50.13
12”	323.8	40	10.31	0.406	80.51	54.1
12”	323.8	XS	12.7	0.5	98.42	66.14
12”	323.8	80	17.48	0.688	133.38	89.63
14”	355.6	40	11.13	0.438	95.51	64.18
14”	355.6	XS	12.7	0.5	108.48	72.9
14”	355.6	80	19.05	0.75	159.71	107.32
16”	406.4	XS-40	12.7	0.5	124.55	83.69
18”	457	STD	9.53	0.375	106.23	71.38
18”	457	40	14.27	0.562	157.38	105.75
18”	457	80	23.83	0.938	257.13	172.78
20”	508	40	15.09	0.594	185.28	124.5
20”	508	80	26.19	1.031	314.33	211.22

FAQ of Welded Pipe:

①How is the quality of your products?
Our products are manufactured strictly according to national and internaional standard, and we take a test on every pipe before delivered out. If you want see our quality certifications and all kinds of testing report, please just ask us for it.
Guaranteed: If products’ quality don’t accord to discription as we give or the promise before you place order, we promise 100% refund.

②How about price?
Yes, we are factory and be able to give you lowest price below market one, and we have a policy that “ for saving time and absolutely honest business attitude, we quote as lowest as possible for any customer, and discount can be given according to quantity”,if you like bargain and factory price is not low enough as you think, just don’t waste your time.Please trust the quotation we would give you, it is professional one.

③Why should you chose us?
Chose happens because of quality, then price, We can give you both.Additionally, we can also offer professional products inquiry, products knowledge train(for agents), smooth goods delivery, exellent customer solution proposals.Our service formula: good quality+good price+good service=customer’s trust
SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem.

Any question, pls feel free to contact us !

Welded Pipe Images：

Model and Diverse Range of Welded Pipe for Your Cooperation

Q: How are steel pipes tested for mechanical strength?: Steel pipes are tested for mechanical strength through various methods such as tensile testing, hydrostatic testing, and non-destructive testing. Tensile testing involves pulling the pipe until it breaks to measure its ultimate tensile strength. Hydrostatic testing involves pressurizing the pipe with water to check its ability to withstand high internal pressures. Non-destructive testing methods like ultrasonic testing or magnetic particle inspection are also used to detect any defects or weaknesses in the pipe without causing damage. These tests ensure that steel pipes are strong enough to withstand the required mechanical stresses.

Q: What are the properties of steel that make it suitable for pipe manufacturing?: Steel is an ideal material for pipe manufacturing due to its various properties, including high strength, durability, and resistance to corrosion and extreme temperatures. It can withstand high pressure and can be easily fabricated into different shapes and sizes, making it versatile for various piping applications. Additionally, its smooth surface ensures efficient flow of fluids and reduces friction losses.

Q: How to identify stainless steel pipe and steel pipe?: Steel pipe according to the production method can be divided into two categories: seamless steel pipe and pipe joints, pipe joints as welded steel pipe.1. seamless steel tube according to the production methods can be divided into: hot-rolled seamless pipe, cold drawn tube, precision steel tube, heat expansion tube, cold spinning tube and extrusion tube.Seamless steel tubes are made of high quality carbon or alloy steel. They are hot-rolled and cold-rolled (drawn).Bundled steel pipe2. welded steel pipe for different welding process and divided into the furnace pipe welding (ERW) pipe and automatic arc welding, because of the different forms of welding seam welded pipe and spiral welded pipe is divided into two kinds, end its shape is divided into circular welded and shaped (square, flat) pipe.

Q: How do you calculate the pipe pressure drop for steel pipes?: To determine the pressure drop in steel pipes, there are two equations that can be utilized: the Darcy-Weisbach equation and the Hazen-Williams equation. The Darcy-Weisbach equation, although more precise, necessitates a greater amount of information. It takes into consideration the diameter, length, roughness, fluid flow rate, as well as fluid properties like viscosity and density. The equation is expressed as: To calculate the pressure drop (ΔP), the following formula can be used: (f * L * ρ * V^2) / (2 * D) In this formula: - ΔP denotes the pressure drop - f represents the friction factor (which can be determined using Moody's chart or empirical equations such as the Colebrook-White equation) - L signifies the length of the pipe - ρ denotes the fluid density - V represents the fluid velocity - D signifies the pipe diameter On the other hand, the Hazen-Williams equation is a simplified version commonly employed for water flow calculations. Although less accurate, it is more user-friendly. The equation is expressed as: To calculate the pressure drop (ΔP), the following formula can be used: K * Q^1.85 / (C^1.85 * d^4.87) In this formula: - ΔP denotes the pressure drop - K signifies the Hazen-Williams coefficient (which relies on the pipe material and roughness) - Q represents the flow rate - C signifies the Hazen-Williams roughness coefficient - d denotes the pipe diameter It is crucial to note that these equations provide estimations of the pressure drop, and actual conditions may vary due to factors such as fittings, bends, and valves in the pipe system. Furthermore, consistency in unit usage (e.g., SI units or US customary units) is of utmost importance when employing these equations.

Q: How are steel pipes used in the construction of railways and transportation systems?: Various purposes necessitate the common use of steel pipes in the construction of railways and transportation systems. Bridges and tunnels, in particular, heavily rely on steel pipes. In bridge construction, steel pipes act as structural components, providing overall support and stability. As for tunnels, steel pipes serve as ventilation shafts, promoting air circulation and the removal of fumes, thus ensuring the safety of passengers and workers. Furthermore, steel pipes find utility in the construction of railway tracks. They are utilized as supports, offering a stable foundation for train travel. In this context, steel pipes are typically coated or galvanized to prevent corrosion and guarantee their longevity. Additionally, steel pipes are employed in drainage systems within railway stations and transport hubs, playing a crucial role in proper water management and the prevention of flooding. Another significant application of steel pipes in transportation systems lies in the construction of signposts and streetlights. In these structures, steel pipes often serve as the primary structural element, providing strength and durability. Their malleability and ease of fabrication make them a sought-after choice, as they can be shaped to meet specific design requirements. In summary, steel pipes assume a vital role in the construction of railways and transportation systems, offering structural support, ensuring adequate ventilation, facilitating drainage, and serving as key components in various structures. Their strength, durability, and versatility render them an ideal choice for these applications, contributing to the safe and efficient operation of transportation networks.

Q: Are steel pipes suitable for underground cable protection?: Indeed, underground cable protection can be achieved through the use of steel pipes. These pipes boast remarkable durability and strength, rendering them an optimal choice for safeguarding cables against external elements such as physical harm, wetness, and corrosion. They are capable of enduring the soil's weight and any potential pressure from above, guaranteeing the cables' security and protection. Furthermore, steel pipes can be effortlessly welded or connected to establish a continuous and flawless conduit, thereby bolstering their efficacy in underground cable protection.

Q: What are the different types of steel pipe fittings for gas pipelines?: There are several types of steel pipe fittings commonly used for gas pipelines, including elbows, tees, reducers, couplings, and flanges. These fittings are essential for connecting and directing the flow of gas within the pipeline system.

Q: What is the difference between hot-dip galvanizing and electroplating of steel pipes?: Steel pipes can be protected from corrosion using two different methods: hot-dip galvanizing and electroplating. To protect steel pipes using hot-dip galvanizing, they are immersed in a molten bath of zinc. The zinc reacts with the steel to create a strong and uniform coating that effectively prevents corrosion. This method is commonly used for outdoor applications and in harsh environments where the pipes are exposed to water or chemicals. In contrast, electroplating involves depositing a thin layer of metal, usually zinc, onto the surface of the steel pipes using an electric current. The steel pipes act as the cathode, and a zinc anode is placed in a solution containing zinc ions. The electric current causes the zinc ions to react with the steel and form a thin coating. Electroplating is often chosen for indoor applications or when aesthetics are a priority. Hot-dip galvanizing generally provides a thicker and more durable coating compared to electroplating. The hot-dip galvanized coating is several times thicker than the electroplated zinc coating, offering better corrosion protection and a longer lifespan for the pipes. The appearance of the coatings also differs. Hot-dip galvanizing results in a matte gray finish, while electroplating can give a more lustrous and shiny appearance. Cost-wise, hot-dip galvanizing is more cost-effective for larger projects because it can coat multiple pipes simultaneously. On the other hand, electroplating is usually more expensive and time-consuming, especially for larger quantities of steel pipes. Ultimately, the choice between hot-dip galvanizing and electroplating depends on the specific requirements of the project, including the intended application, environment, aesthetics, and budget constraints.

Q: Is the diameter of the steel tube indicated by the outer diameter by the wall thickness or by the inside diameter by the wall thickness?: The specification for steel tubes is the outer diameter multiplied by the wall thickness.Generally speaking, the diameter of the pipe can be divided into outer diameter (De), inner diameter (D) and nominal diameter (DN).

Q: How are steel pipes stored and transported?: Steel pipes are typically stored in warehouses or open yards, stacked in an organized manner to prevent damage. They are often transported using trucks or railcars, secured with straps or clamps to ensure stability. For long-distance transportation, pipes may be bundled together or loaded onto flatbed trailers. Additionally, protective coatings are applied to prevent corrosion during storage and transportation.

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