Large diameter spiral tube production process

- Nov 13, 2020-

Large diameter spiral tube production process

(1) The raw materials are strip coils, welding wires, and flux. Strict physical and chemical testing is required prior to input.

(2) The steel head and the tail are butt jointed, and single or double-line submerged arc welding is adopted. After the steel pipe is rolled, automatic submerged arc welding is adopted.

(3) Surface cleaning and pre-bending treatment are carried out by leveling, trimming the edges, and trimming the strips prior to forming.

(4) The electric contact pressure gauge is used to control the cylinder pressure on both sides of the conveyor to ensure the smooth conveying of the conveyor belt.

(5) Externally controlled or internally controlled roll forming.

(6) Weld control device is used to ensure that the weld meets the welding requirements, strictly control the pipe diameter, the misalignment and the weld gap.

(7) Both internal and external welding are performed by single or double wire submerged arc welding, using a Lincoln welding machine in the United States to obtain stable welding specifications.

(8) The welds are in-line continuous ultrasonic automatic injury inspection to ensure non-destructive testing of 100% spiral welds. If there is a defect, the alarm will automatically alarm and spray, and the production worker can adjust the process parameters at any time to eliminate defects.

(9) The steel pipe is cut into a single piece by an air plasma cutting machine.

(10) After cutting into a single steel pipe, the first three inspections of each batch of steel pipes shall be inspected in accordance with the first inspection system for mechanical properties, chemical composition, fusion state, surface quality and non-destructive testing to ensure the pipe making process. . Once qualified, it can be formally put into production.

(11) The part of the weld with the continuous acoustic flaw detection mark, after manual ultrasonic and X-ray inspection, if it is defective, the repair will pass the non-destructive test again until it is confirmed.

(12) The butt weld pipe of the strip and the butt joint with the spiral „ slit are checked by X-ray TV or film ã ‚

(13) A hydrostatic pressure test was performed on each of the steel pipes, and the pressure was radially sealed. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. Automatically print and record test parameters.

(14) Tube end processing to precisely control the perpendicularity of the end face, groove angle and blunt edge.

Product Description

We are Shandong Baokun Metal Material Co., Ltd, one of the Leading suppliers of Precision Steel Tubes.

Product Name
E235 E355 Precision Steel Tube
Carbon Steel,Alloy Steel,etc
Hot Rolled,Cold Rolled,Cold Drawn,ERW,etc.
Black,Natural or As per customer's Request
ASTM A 106 GR A & B, A 53 GR A & B, ASTM A 333, Gr 1 to 6 (IBR & NON IBR),APL 5L GR.A & B,API 5 L GR.X-42,X-46,X-52,X-56,X-60,X-65 & X-70 IN PSL 1 & PSL 2;
ASTM A 335, GR P 1, P 2, P 5, P 9, P 11, P 12, P 22, P 91, GR T 1, T 2, T 5, T 9, T 11, T 12,T 22, T 91(IBR & NON IBR);
S10C,S15C,S20C,S45C, St37,St35.8,St45-8,St52,St52.4,etc.
Round,Square,Rectagular,Oval,Special Shape according to csutomer's requirement
Outer Diameter(OD)
2~406mm; DN6~DN400
Wall Thickness(WT)
1~60mm; SCH5S~SCH40~SCH60~SCH80~XXS
According to standard or Customized
Fixed Length: 5.8m, 6m,12m.

Random Length or as request
Product,Size,Heat No.According to customer's demand
Plain ends,Bevelled ends,Square cut
Machinery,Bearing,Hydraulic equipment, Automobile parts, Steel sleeve,Military,Etc.
Delivery Condition
BK(+C), BKW(+LC), BKS(+SR), GBK(+A),NBK( +N)
OEM Accepted
Products Show
Packing & Delivery


Normally packed in bundles with strong metal strips;

Bare or with woven bag or pupple film, or put in wooden crate;

If not in bunles, we put pipe in pipe or single pipe,

If pipe length ≤ 5.8m, loaded in 20' container,

If pipe length ≤ 11.8m, loaded in 40' container,

If pipe length > 11.8m, load on board by bulk FILO Terms.

Cangzhou Steel Pipe Group (CSPG)Co.,Ltd.

No.92 JieFang East Road ,Cangzhou City, Hebei,P.R.China.

CSPG  has more than eighteen years history company which located in Lecong Iron and Steel World, a well-known steel distribution center in China, with superior geographical position and convenient water and land transportation. 

We are a direct-selling manufacturer specializing in the research and development of spiral steel pipes, steel spiral pipes, anti-corrosion steel pipes inside and outside. Since its inception, the company has been guided by a brand-new thinking of steel pipe product market based on the business philosophy of honesty, pragmatism and knowledge-seeking.

1. Bare Pipe bundled by strips

2. Put in white woven bags

3. Put into wooden crates

Our Service

High quality

Passed the ISO9001:2008 quality can meet International Standerds

Various Product Range

Order many different items,steel pipes, plates,bars,profiles,etc.We can offer even you order small quantity

Fast Delivery

We have professional staff tracking the production and each detail procedure

Our Company


Our Factory with productionlines


Our Workshop with advanced facilities


Our Warehouse with thousands of stock


Our Team with professional and responsible personnels

Our Certifications
Customer Photo

Comment from Italian Client:

We are happy that your company put quality first.
We have trust in you and are assured for more cooperation in the future.

Comment from Canadian Client:

It's good experience working with your people.
There are less problem and more active solutions for every small issue.
We would like for more cooperations with your company.

Q: Where are you located?

A: We are in Dadong Steel Industrial Park,Liaocheng City,Shandong Province.

Q: How long is your delivery time?

A: Generally it is 5~7 days if the goods are in stock. or it is 15-20 days for production.

Q: Do you provide samples ? is it free or extra ?

A: Yes, we could offer the sample for free charge but do not pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
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