Hollow Section-Square Tubes

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Loading Port:: Tianjin

Payment Terms:: TT or L/C

Min Order Qty:: 50MT m.t.

Supply Capability:: based on order m.t./month

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Hollow Section-Square Tubes

Application:

It is widely used in building, machine, chemical equipment, automobile industrial, container, it is also applied to agriculture and mine machine.

Standard：

ASTM A500, GB6728

Steel grade:

ASTM A500: A, B, C

GB6728：Q195，Q215，Q235，Q345

Size of Pipe:

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

SIZE(mm)	THICKNESS(mm)
10×10	0.6-1.0
12×12	0.6-1.0
16×16	0.6-1.2
19×19	0.6-1.5
20×20	1.6-1.5
25×25	1.0-2.75
30×30	1.0-2.75
32×32	1.0-3.0
38×38	1.0-3.0
40×40	1.0-3.5
50×50	1.0-5.0
60×60	1.0-6.0
63.5×63.5	1.0-6.0
70×70	1.5-6.0
75×75	1.5-6.0
80×80	2.0-6.0
90×90	2.0-6.0
100×100	2.3-6.0
120×120	4.0-6.0
125×125	4.0-6.0
150×150	4.0-8.0
200×200	6.0-12
250×250	6.0-12
300×300	6.0-12
400×400	6.0-12

Standard: ASTM A500

Chemical Composition(%)

Chemical Requirement
	Composition %
	Grade A		Grade B
	Heat	Product	Heat	Product
Element	analysis	analysis	analysis	analysis
Carbon max	0.26	0.3	0.22	0.26
Manganese max	…	…	1.4	1.45
Phosphorus, max	0.035	0.045	0.03	0.04
Sulfur max	0.035	0.045	0.02	0.03
Where an ellipsis (...)appears in this table, there is no requirement
For each reduction of 0.01 percentage point below the specified maximum for carton, and increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50% by heat analysis and 1.6% by product analysis

Mechanical Properties

Tensile Requirement
	Grade A	Grade B
Tensile strength, min, psi (Mpa)	48000 (400)	70000 (483)
Yield strength, min, psi (Mpa)	36000 (250)	50000 (345)
Elongation in 2 in. (50.8mm), min, %	23	23

GB6728：

Steel Grade

CHEMICAL COMPOSITION

MECHANICAL PROPERTIES

C (%)

Si (%)

(%)

P(%)

Max

S (%)

Max

YS(Mpa)

Min

TS(Mpa)

Min

El (%)

Min

Q195

0.06-0.012

0.3

0.25-0.5

0.45

0.5

195

315

Q215

0.09-0.15

0.3

0.25-0.55

0.45

0.5

215

335

Q235

0.12-0.22

0.3

0.3-0.7

0.45

235

375

Q345

0.20

0.55

1.0-1.6

0.45

345

510

producing of Hollow Section-Square Tubes

Square Welded Hollo Sectio/Welded Rectangle Hollow Section

delivery of Hollow Section-Square Tubes

Q: How are steel pipes used in airport infrastructure?: Steel pipes are used in airport infrastructure for a variety of applications such as constructing hangars, fuel distribution systems, water supply networks, and underground utility lines. They provide structural support, durability, and resistance to extreme weather conditions, making them essential for the smooth functioning and long-term reliability of airport facilities.

Q: How do you calculate the pipe head loss for steel pipes?: The head loss in steel pipes can be calculated using the Darcy-Weisbach equation, which takes into account factors such as the pipe length, diameter, roughness, flow rate, and fluid properties. This equation provides an accurate estimation of the head loss based on these variables.

Q: What is the standard length of steel pipes?: The standard length of steel pipes can vary depending on the application and industry, but commonly they are available in lengths of 20 feet or 6 meters.

Q: What are the lengths of scaffold steel tubes?: Used to build scaffolding of steel pipes in general have two kinds, an outer diameter 48mm, wall thickness 3.5mm; another kind of outer diameter 51mm, wall thickness 3mm; according to its location and role of different, can be divided into vertical pole, horizontal rod, sweeping rod, etc.. According to the technical specification for construction of steel tubular scaffold with couplers, JGJ 130 - 2011[1]. The scaffolding steel pipe should be specified with the current national standard "GB/T13793" or "straight seam welded steel pipe welded steel pipe for low pressure liquid delivery" GB/T3091 Q235 ordinary steel pipe; steel pipe steel quality should meet the requirements of current national standard grade Q235 steel "carbon structural steel" in GB/T700. The scaffold pipe shall be made of a diameter of 48.3 * 3.6 steel tubes. The maximum mass of each steel tube shall not be greater than 25.8kg.

Q: How do you determine the maximum allowable stress for steel pipes?: To determine the maximum allowable stress for steel pipes, several factors need to be considered. These factors include the material properties of the steel, such as yield strength and ultimate tensile strength, as well as the intended use and operating conditions of the pipes. Standards and codes such as ASME B31.3 or API 5L provide guidelines and formulas to calculate the maximum allowable stress based on these factors. Additionally, industry experts and engineers use various testing methods and simulations to ensure the safety and integrity of steel pipes under different loads and environments.

Q: Can steel pipes be used for conveying potable water?: Indeed, steel pipes have the capability to convey potable water. Nevertheless, there are certain factors and precautions that necessitate consideration. Steel pipes possess strength and durability, rendering them suitable for the transportation of water across significant distances. They are also resistant to corrosion and capable of enduring high levels of pressure. In order to guarantee the safety and quality of the water being conveyed, it is crucial to employ pipes that have been specifically designed and manufactured for potable water applications. These pipes are often equipped with coatings or linings composed of materials that inhibit the leaching of contaminants into the water, such as epoxy or cement mortar lining. Furthermore, regular maintenance and inspections should be conducted to prevent the accumulation of sediments or rust that could potentially impact the water quality. It is important to acknowledge that steel pipes may prove more costly in comparison to alternative materials such as plastic or copper. Nevertheless, their longevity and reliability render them a cost-effective choice in the long run. Adhering to local regulations and standards concerning the utilization of steel pipes for conveying potable water is also imperative to ensure the well-being and safety of consumers.

Q: What are the advantages of using steel pipes in the mining industry?: There are several advantages of using steel pipes in the mining industry. Firstly, steel pipes are extremely durable and can withstand high-pressure environments, making them ideal for transporting materials such as water, slurry, and chemicals in mining operations. Secondly, steel pipes are resistant to corrosion, which is crucial in the mining industry where materials are often exposed to harsh conditions and abrasive substances. Additionally, steel pipes have a high heat tolerance, allowing them to handle hot materials without deformation or damage. Lastly, steel pipes are easy to install and maintain, reducing downtime and ensuring smooth operations in the mining industry.

Q: What is the difference between steel pipe and round steel?: The middle of the steel pipe is hollow, and the round steel is solid. When compared with the solid steel such as round steel, the steel tube has the same flexural strength and torsion strengthLight weight, is an economic section of steel, widely used in the manufacture of structural and mechanical parts, such as oil drilling pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction.

Q: How do steel pipes differ from other types of pipes?: Steel pipes differ from other types of pipes in a few key ways. Firstly, steel pipes are known for their strength and durability. They have a high resistance to heat, pressure, and corrosion, making them suitable for a wide range of applications. This strength also allows steel pipes to withstand heavy loads and provide a long service life. Another distinguishing feature of steel pipes is their versatility. Steel pipes can be manufactured in various shapes and sizes to meet specific project requirements. This adaptability makes them a popular choice for a wide range of industries, including construction, oil and gas, water treatment, and manufacturing. Steel pipes also offer excellent thermal conductivity, meaning they can efficiently transfer heat from one area to another. This makes them suitable for applications such as heating and cooling systems, as well as for transporting hot fluids or gases. Furthermore, steel pipes are known for their resistance to fire. They have a high melting point and do not easily catch fire or contribute to the spread of flames. This property is crucial in applications where fire safety is a concern, such as in buildings or industrial facilities. Lastly, compared to other types of pipes, steel pipes have a higher initial cost. However, their long-term benefits, such as their durability and low maintenance requirements, often outweigh the initial investment. Steel pipes are also highly recyclable, making them an environmentally friendly choice. In summary, steel pipes stand out from other types of pipes due to their strength, durability, versatility, excellent thermal conductivity, fire resistance, and recyclability. These qualities make steel pipes a preferred option for a wide range of applications in various industries.

Q: What are the different types of steel pipe coatings?: There are several types of steel pipe coatings, including epoxy coatings, polyethylene coatings, polyurethane coatings, and zinc coatings. These coatings help protect the steel pipes from corrosion, increase their lifespan, and improve their performance in various environments.

We mainly produces Square and Rectangular Tubes which using the cold rolling technology and other types of tube including Round Steel Pipes, Welded Steel Pipes, Seamless Steel Pipes, Long Products, Flat Steel Products and so on. Our productivity achieves 500, 000 tons each year. Our company is stronger in financial capital and enough power of technical support. The steel tubes made by the company are strictly according to ISO9001:2000 standard quality management system to ensure the high quality of the products.

1. Manufacturer Overview

Location	Tianjin,China
Year Established	2000
Annual Output Value	Above Thirty Million RMB
Main Markets	China; Europe
Company Certifications	ISO9001:2000

2. Manufacturer Certificates

a) Certification Name
Range
Reference
Validity Period

3. Manufacturer Capability

a) Trade Capacity
Nearest Port	Tianjin；Qingdao
Export Percentage	41% - 50%
No.of Employees in Trade Department
Language Spoken:	English；Chinese
b) Factory Information
Factory Size:	53000square meter
No. of Production Lines
Contract Manufacturing	OEM Service Offered；Design Service Offered
Product Price Range	Low Average