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QUALITY

Home » QUALITY

 

QUALITY CONTRAL 

China has a saying, quality is the first, all buyers are very concerned about the quality of the product, so we have a dedicated staff responsible for inspection, inspection of product quality. We can also accept the third party inspection, such as SGS, BV and other tests.


 

1. Chemical composition testing. We have a special chemical composition of the laboratory, a professional staff detact the chemical composition of steel products to ensure that customers can meet the needs of different materials, the yield strength, tensile strength requirements.

QUALITY CONTRAL


 

2. ERW black SHS & RHS pipe

The main produce processes of ERW steel pipes is: strip is fed into a set of forming rolls which consists of horizontal and vertical rollers so placed as to gradually from the flat strip in to a tube which is then allowed to pass the welding electrodes. The electrodes are copper disks connected to the secondary of a revolving transformer assembly.

- Slitting:

HR Coils are slitted to pre-determined widths for each and every size of pipesUncoiling,

- End Shearing And Welding:

The slitted coil is uncoiled at the entry of ERW mill and the ends are sheared and welded one after another. This results in a single endless strip.

- Forming:

The slitted coils are initially formed into U shape and after that into a cylindrical shape with open edges utilizing a series of forming rolls.

- Welding:

In this stage, the open edges are heated to the forging temperature through high-frequency, low-voltage, high current and press welded by forge rolls making perfect and strong but weld without filler materials.

- De beading:

In this stage, the weld flash on top and inside (if required) is trimmed out using the carbide tools.

- Seam Annealing:

If required, the welding portion and heat affected zone is put to normalizing and then are cooled down in a air cooling bed.

- Sizing:

After water quenching, slight reduction is applied to pipes with sizing rolls. This results in producing desired accurate outside diameter.

- Cutting:

In cutting stage, the pipes are cut to required lengths by flying cut off disc/saw cutter.

- End Facing And Bevelling:

This is usually stage, where the pipes ends are faced and bevelled by the end facer. All these processes are continuous with automatic arrangements. These plain ended tubes further go for processing as per the customer requirements such as galvanizing, threading, black varnishing and more.

QUALITY CONTRAL

 


 

3. Inspection. We strictly control the quality of the product. Not only in the production before the raw materials, technical equipment and other strict checks, after the production of goods, we also have a special machine testing products meet customer requirements. From the product's chemical composition, physical properties, to the appearance of long, wide, high, thickness, achieved an integrated detection equipment, completely solve the customers worries.

QUALITY CONTRAL

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Contact Us
Tinajin Goldensun Import& Export Co.,Ltd.
Tel:+86-022-26170772
Fax:+86-022-26287579
Mobile:+86 13752252499
Wechat:+86 13752252499
Whatsapp:+86 13752252499
Skype:gssteel006
Email:goldensun001@goldensunsteel.com
Address:B-502,Zhonghui,Building,Lv Wei Road,Hebei District,Tianjin,China