Welded Steel Tube

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carbon steel welded pipe

01.

What is carbon steel welded pipe?

Carbon steel welded pipes are manufactured by welding steel plates or coils together through processes such as Electric Resistance Welding (ERW) or Spiral Welding (SSAW). The manufacturing process involves material preparation, rolling the steel into a cylindrical shape, welding the edges, and inspecting the final product for quality.

02.

Carbon steel pipe welding process

Steel pipe welding processes include Electric Resistance Welding (ERW) for both high and low-frequency welding, Submerged Arc Welding (SAW) for thick-walled pipes, Tungsten Inert Gas (TIG)/Metal Inert Gas (MIG) welding for high-quality welds in stainless steel and aluminum, Spiral Submerged Arc Welding (SSAW) for large-diameter pipes, and Butt Welding for connecting long pipe sections.

Carbon Steel Welded Pipe

1. Material preparation: Clean and pre-treat the steel plate or strip to remove rust, grease and other impurities on the surface to ensure the quality of subsequent welding.

2. Shearing and leveling: Shear the steel plate into appropriate size as needed, and level it through a leveling machine to ensure that the steel plate is flat.

3. Forming: Use a forming machine to roll the steel plate or strip into a tube. For straight seam welded pipes, use U-O forming or JCO forming process; for spiral welded pipes, the steel strip is formed in the direction of the spiral line.

4. Welding: Weld the formed steel pipe. Commonly used welding methods are electric resistance welding (ERW), submerged arc welding (SAW) and spiral welding (SSAW). Among them, electric resistance welding is suitable for thin-walled steel pipes, and submerged arc welding and spiral welding are suitable for thick-walled and large-diameter steel pipes.

5. Weld seam treatment: After welding, the weld is heat treated or machined to eliminate internal stress and improve the mechanical properties of the weld.

6. Cooling and straightening: After the weld is processed, the steel pipe is cooled and straightened by a straightening machine to ensure the straightness of the steel pipe.

7. Nondestructive testing: The weld is tested using nondestructive testing technologies such as ultrasonic testing and X-ray testing to ensure that the weld quality meets the standards.

8. Dimension inspection: The outer diameter, wall thickness, length and other dimensions of the steel pipe are inspected to ensure that they meet the specifications.

9. Coating and anti-corrosion treatment: According to the use requirements, the steel pipe is coated or anti-corrosion treated to improve its corrosion resistance and service life.

10. Packaging and storage: Finally, the steel pipe is packaged to avoid damage during transportation and storage.

Product Process

Electric Resistance Welding (ERW)

The steel plate or strip is rolled into a tube shape and then the seam is welded by electric resistance heating

Spiral Submerged Arc Welding (SSAW)

The steel strip is rolled into a tube shape in a spiral manner and then welded using submerged arc welding.

Longitudinal Submerged Arc Welding (LSAW)

The steel plate is bent into shape and then welded along the longitudinal seam, commonly used for thick-walled and large-diameter pipes.

High-Frequency Welding (HFW)

Utilizes high-frequency current to heat the edges of the steel strip and weld them together, typically used for small-diameter pipes.

Application

Construction engineering

Structural frames, support beams, scaffolding, etc.

Oil and gas industry

Transporting oil, natural gas and other liquids

Machinery manufacturing

Axles, transmission tubes, machinery

Chemical industry

Transport various chemical liquids and gases

Factory Introduction

TORICH INTERNATIONAL LIMITED is a professional steel pipe material manufacturer and exporter with more than 20 years of experience. Our factory covers an area of more than 50,000 square meters. We have professional production equipment and complete testing equipment. Professional production (seamless steel pipes, welded steel pipes, DOM steel pipes, capillary tubes), etc. Proficient in (cold drawn cold rolled hot fire eddy current) etc. And our team will also provide various customized services OEM&ODM. We also have good service and after-sales capabilities. We can provide you with competitive prices and high-quality products in the market. We can deliver the goods faster than others. destination.

2000

Founded in

20+

years experience

300000

Covered area

1000+

Existing employees

Certifications

CE-1

CE-2

CE-3

ISO9001-1

ISO9001-2

TS16949

FAQ

Q: What’s your MOQ?

A: If we have the products in stock, it will be no MOQ. If we need to produce, we can discuss the MOQ according to customer's exact situation

Q: How long is your delivery time?

A: The general delivery time is 30-45 days after receiving your order confirmation. Anther, if we have the goods in stock, it will only take 1-2 days.

Q: Do you provide sample ? Is it free?

A: If the sample is low value, we will provide the free sample with freight collect. But for some high value samples, we need to collect the sample charge.

Q: Commonly used carbon steel welded pipe materials

A: Common raw material steel grades for carbon steel welded pipes vary in different countries and regions. Common steel grades in the United States include A36 (for building structures and general purposes), A53 (for conveying fluids, especially low-pressure purposes), A106 (seamless carbon steel pipes suitable for high-temperature environments) and API 5L (for pipeline transportation in the oil and gas industry). Common steel grades in the European Union include S235JR (EN 10025) (for structural applications), P235GH (EN 10216-2) (for boilers and pressure vessels) and S355J2H (EN 10210) (for cold-formed structural purposes). Common steel grades in Japan include SS400 (JIS G3101) (for construction and bridge engineering), STPG370 (JIS G3454) (for pipeline conveying fluids) and STS42 (JIS G3455) (for high-pressure pipelines). Common steel grades in Russia include Ст3сп (for building structures), Ст20 (ГОСТ 8731/8732) (seamless pipes for fluid transportation) and 09Г2С (for low temperature environments). Common steel grades in China include Q235B (GB/T 700) (for building structures), 20# (GB/T 8163) (for fluid transportation pipelines) and 16Mn (GB/T 6479) (for high-pressure fertilizer equipment). These steel grades represent the specific regulations and application standards for carbon steel welded pipe materials in various countries and regions.

Q: Are you trading company or manufacturer?

A: We are a one-stop steel pipe procurement service provider. We have our own production base.

Q: Can you do OEM and ODM

A: We support both OEM and ODM, but will stipulate the basic minimum order quantity, which is usually 1 ton. If you have customized requirements, you can send us an inquiry.

Q: Can we use our own logo?

A: We support spraying labels on steel pipes, including but not limited to (manufacturer, standard, material, specification, furnace number, batch number, LOGO)

Q: Can you do our own packaging?

A: Yes,We support customized wooden boxes, nylon braided straps, steel strapping, etc. Customized packaging required by customers

Q: How many different types of products your company manufactures?

A: We only produce steel pipe products, including carbon steel (seamless welding), stainless steel (seamless welding), alloy steel (nickel-based Hastelloy), and steel pipes made of non-ferrous metal materials, and steel pipe back-end processing and pipe fittings customization and sampling. There are more than 1,000 products

Q: When can I get the price?

A: Normally we will quote within 12 hours. If you have special requirements, you need to provide drawings. We will communicate with production R&D and give you a quote, but you won't have to wait too long.

Q: how about your Quality Control？

A: 1. Incoming Raw Material Inspection

2. Raw Material Segregation to avoid steel grade mix-up

3. Heating and Hammering End for Cold Drawing

4. Cold Drawing and Cold Rolling, on line inspection

5. Heat Treatment, +A, +SRA, +LC, +N, Q+T

6. Straightening-Cutting to specified length-Finished Measuring Inspection

7. Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc

8. Packing and Stocking.

100% of our steel tubes are dimensionally checked

100% of our steel tubes are visually checked to assure they have a perfect surface condition and no surface defects.

100% eddy current test and ultrosonic test to eliminate longitudinal and transversal defects.

Q: What about your Service？

A: 1.Better manufacture ability

2.High quality/Competitive price

3.Quickly response

4.More safe and fast transport

5.Strong professional technical team ensure to produce the top quality products.

6.Special cost control system ensure to provide the most favorable price

Q: Do you support customized drawings?

A: Yes, we support drawing customization. We currently equip our R&D workshop with a full range of software (SOLIDWORKS AutoCAD, etc.)

Q: Where is your factory located?

A: We have our own factories in Jiangsu and Zhejiang that integrate R&D, production, testing and delivery.

Q: When did your factory established?

A: Our original factory was established in Zhejiang in 1997

Q: Where is your product use in?

A: Our products are used in various industries, including but not limited to construction, petroleum and petrochemical, automobile, mechanical engineering, aerospace, energy, fluid transportation, etc.

Q: What machines you have in your factory?

A: The factory has 12 workshops for R&D, production and inspection. The workshops are fully equipped, such as cold-drawn tube production workshop, oxygen-free annealing workshop, heat treatment workshop, cold rolling workshop, hot rolling workshop, pickling workshop, CNC processing workshop, ultrasonic testing workshop, etc.

Q: Do you have QC department?

A: We have our own testing building and workshop with complete testing equipment, including pipe chemical composition testing, mechanical properties testing, ultrasonic non-destructive testing, water pressure, expansion, flattening and other tests.

Q: Do you have a showroom?

A: In the center of each workshop, our office building has a showroom on the first floor, which has steel pipes of various shapes and materials.

We're well-known as one of the leading welded steel tube manufacturers and suppliers in China. Please feel free to wholesale high quality welded steel tube for sale here from our factory. For price consultation, contact us.

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