Pipes steel electrowelded

Pipe production

Pipes can be produced in several ways

Depending on the raw materials and the method of production, there are:

• Longitudinal pipes steel electrowelded
• Helical pipes steel electrowelded
• Seamless hot-wrought pipe
• Seamless cold-rolled pipe

Main phases of production:

Longitudinal pipes steel electrowelded

• The strip is a rolled up steel sheet which is drawn off and cut into longitudinal flat bars
• The flat bars are welded into an endless strand, which is necessary for ensuring the continuous operation
• The strand is deformed with roll mills, turning into the stock material with round section and opened seam
• The seam is welded. There are several types of welding - arc welding, induction welding, laser welding, plasma welding, bundle welding

There are two the most used welding methods: gas tungsten arc welding (GTAW) - is an arc welding process that uses a non-consumable tungstenelectrode to produce the weld and high frequency (HF) welding - is the joining of materials by supplying HF energy in the form of an electromagnetic field.

The weld made with the first method is stronger but the second method of welding is about 20 times faster, respectively, HF welded pipes are much cheaper.

• Then, the steel round pipe is calibrated with roll mills
• The weld is got under the non-destructive inspection with whirling currents or ultrasound
• Next, the pipe is cut on the sections with needed length and stored.

Helical pipes steel electrowelded

Production of this type of the pipes is the same as the production of the longitudinal pipes steel electrowelded but the strand is rolled up with roll mills, turning not into the pipe, but into the spiral. Spiral weld provides the pipe with great tensile strength.

Seamless hot-wrought pipe

The seamless pipe (it is also called weldless drawn pipe) is produced from the cylindrical solid-cast stock material with the hot deformation method:

• The stock material is heated in the furnace
• Next, it is passed into the sleeve (quill cylinder) with the piercing machine
• The hot sleeve passes through several roll mills, stretching and getting the required diameter and walls thickness
• Then, the finished round pipe is cooled, cut and sent to the warehouse of finished products.

Seamless cold-rolled pipe

There are only two differences from the production of the previous pipe type:

• After the piercing mill, the sleeve is cooled and all subsequent operations are carried out in a cold state
• The pipe must be annealed after the forming. It is heated to the recrystallization temperature of the steel and cooled

This process makes the steel more ductile, also unavoidable internal stresses leave the metal.

The market offers seamless cold-rolled pipes with wall thickness of 0.3 to 24mm, diameter from 5 to 250mm.

AV metal group produces

Round pipes:

Wall thickness from 1mm to 2.5mm

• Ø19mm
• Ø 20mm
• Ø 22mm
• Ø 25mm
• Ø 21.3mm (nominal bore 15)
• Ø 26.8mm (nominal bore 20)
• Ø 33.5mm (nominal bore 25)

Wall thickness up to 3mm

• Ø 48mm (nominal bore 40)

Shaped pipes:

• 10х10 — 0.8-1-1.2-2.0mm
• 15х15 (20х10) — 0.8-1-1.2-2.0mm
• 17х17 —0.8-1- 1.2-2.0mm
• 20х20 (30х10) —0.8-1-1.2-2.0mm
• 25х25 (30х20) — 1-1.2-2.0mm
• 30х30 (40х20) — 1-1.2-2.5 (3)mm
• 40х40х1.5-1.8-2.0-3mm
• 40х25х1.5-1.8-2.0-3mm
• 50х25х1.5-1.8-2.0-3mm
• 50х30х1.5-1.8-2.0-3mm
• 50х50х1.5-1.8-2.0-3mm
• 60х40х1.5-1.8-2.0-3mm
• 60х40х1.8-2.0-3mm
• 80х40х1.8-2.0-3mm

The production of AV metal group corresponds to the European certificate of factory production control in accordance with the DIN EN 102-12-1: 2006. For more information follow the link. This standard regulates the production of welded circular and shaped pipes that are manufactured in a cold way.

Our products are subject to internal factory control, which is inspected by the supervision web-site of construction products in the TÜV Thüringen e. V.

The range of pipes that is certified according to the DIN EN 102-12-1: 2006 and includes:

• Welded rounds manufactured in the cold way DIN 102-19-1, using S 235JRH steel grade with a diameter in the range from 21,3 to 76,1, mm and with the thickness in the range from 2 to 3 mm.

• Welded square sections manufactured in the cold way DIN 102-19-1, using S 235JRH steel grade with the side dimension in the range from 20 x 20 to 60 x 60 mm and thickness in the range from 2 to 3 mm.

• Welded rectangular profiles manufactured in the cold way DIN 102-19-1, using S 235JRH steel grade with the side dimension in the range from 40х20 to 80х40 mm and thickness in the range from 2 to 3 mm.

Range of products:

Size, mm	Wall thickness, mm	Size, mm	Wall thickness, mm	Size, mm	Wall thickness, mm
15х15 15х15 15х15	1 (1.2) 1.0 1.2	30х30	1.7	50х30	1.5
15х15	1.5	30х30	1.8	50х30	1.7
15х15	1.7	30х30	2	50х30	1.8
15х15	1.8	40х20	1.2	50х30	2
15х15	2	40х20	1.5	50х30	2.8
17х17 20х20 20х20	1 (1.2-2) 1.0 1.2	40х20	1.7	50х30	3
20х20	1.5	40х20	1.8	50х50	1.5
20х20	1.7	40х20	2	50х50	1.7
20х20	1.8	40х25	1.5	50х50	1.8
20х20	2	40х25	1.7	50х50	2
25х25	1.2	40х25	1.8	50х50	2.8
25х25	1.5	40х25	2	50х50	3
25х25	1.7	40х40	1.5	60х40	1.5
25х25	1.8	40х40	1.7	60х40	1.7
25х25	2	40х40	1.8	60х40	1.8
30х20	1.2	40х40	2	60х40	2
30х20	1.5	40х40	2.8	60х40
Size, mm	Wall thickness, mm	Size, mm	Wall thickness, mm	Size, mm	Wall thickness, mm
15х15 15х15 15х15	1 (1.2) 1.0 1.2	30х30	1.7	50х30	1.5
15х15	1.5	30х30	1.8	50х30	1.7
15х15	1.7	30х30	2	50х30	1.8
15х15	1.8	40х20	1.2	50х30	2
15х15	2	40х20	1.5	50х30	2.8
17х17 20х20 20х20	1 (1.2-2) 1.0 1.2	40х20	1.7	50х30	3
20х20	1.5	40х20	1.8	50х50	1.5
20х20	1.7	40х20	2	50х50	1.7
20х20	1.8	40х25	1.5	50х50	1.8
20х20	2	40х25	1.7	50х50	2
25х25	1.2	40х25	1.8	50х50	2.8
25х25	1.5	40х25	2	50х50	3
25х25	1.7	40х40	1.5	60х40	1.5
25х25	1.8	40х40	1.7	60х40	1.7
25х25	2	40х40	1.8	60х40	1.8
30х20	1.2	40х40	2	60х40	2
30х20	1.5	40х40	2.8	60х40	2.8
30х20	1.7	40х40	3	60х40	3
30х20	1.8	50х25	1.5	60х60	1.8
30х20	2	50х25	1.7	60х60	2
30х30	1.2	50х25	1.8	60х60	2.8
30х30	1.5	50х25	2	60х60 80х60 80х40 80х40	3 1.8 1,8 2.8 (3)
2.8
30х20	1.7	40х40	3	60х40	3
30х20	1.8	50х25	1.5	60х60	1.8
30х20	2	50х25	1.7	60х60	2
30х30	1.2	50х25	1.8	60х60	2.8
30х30	1.5	50х25	2	60х60 80х60 80х40 80х40	3 1.8 1,8 2.8 (3)

It is planned to develop pipes with the existing capacity:

• 60х30х1.8;2;3

General characteristic of production Birlik Makine ВТМ 120Н

Up to date, Birlik Makine has been installed and put into operation, on which electro-welded round and shaped pipes are produced. The type of welding is high-frequency welding. Also, square and rectangular welded shaped pipes, round pipes for gas and water conveyance, structural pipes from hot-rolled and cold-rolled coiled steel are produced.