This group of metal products includes longitudinal electrically welded steel pipes made of carbon and low-alloyed steel used for pipelines and structures of different purposes.

There are many types of longitudinal electrically welded pipes, including:

· round

· shaped (square, rectangular, oval);

· Steel bent closed welded square and rectangular sections (square and rectangular)

This group includes longitudinal electrically-welded steel pipes with diameter:

· From 10 to 530 mm as per GOST 10705-91 ;

· From 478 to 1420 mm as per GOST 10706-76 .

Pipe schedule conforms to GOST 10704-91 .

Pipes are fabricated of the following lengths:

· Off-gauge length – from 2 to 12m

· Gauge length – from 5 to 12m

Pipes with diameter over 426 mm are only off-gauge length.

Gauge and multiple length pipes are divided into 2 grades by length accuracy:

· with ends cut and sharp edges removed;

· without ends cut and sharp edges removed (with cutting at rolling mill).

Pipes are fabricated of the following steel grades:

· Ñò2ñï, Ñò2ïñ, Ñò2êï, Ñò4ñï, Ñò4ïñ, Ñò4êï according GOST 380;

· 10, 10ïñ, 20, 35, 45, 08êï ïî GOST 1050 .

· À – with normalization of mechanical characteristics;

· Á - with normalization of chemical composition;

· Â – with normalization of mechanical characteristics and chemical composition;

· Ä –with normalization of hydraulic test pressure.

· Height (width) of section up to 100 mm - ±1,5ìì;

· Height (width) of section over 100 mm- ± 2ìì.

· thickness 2,0-3,5mm - ±0,22;

· thickness 3,5-3,9mm - ±0,24;

· thickness 3,9-5,5mm - +0,3/-0,5;

· thickness 5,5-7,5mm - +0,25/-0,6;

· thickness 7,5-10,0mm - +0,3/-0,8;

· thickness 10,0-12,0mm - +0,3/-0,8.

· Off-gauge length – from 1.5 to 10m

· Gauge length – in the range of off-gauge length pipe with + 15mm length limit deviations;

· Multiple gauge length – in the range of gauge length with 5 mm allowance for each cut and +15mm full-length deviation. Minimum multiple length is 300mm

· Limited length – in the range of gauge length with ± 500 mm length limit deviation

Stainless hot-deformed pipes are made of steel with chemical composition as per GOST 5632 with microaddings of rear-earth metals.

Presence of sulfur in steel that is utilized for pipe fabrication subject to welding shall not be over 0.02%.

Fabricated pipes can be heat-treated or non heat-treated.

· Off-gauge length

· With wall thickness up to 0.5mm - from 0,75 to 7m;

· With wall thickness from 0.5 up to 1.0mm – from 1,0 to 7m;

· With wall thickness from 1.00 mm and more - from 1,5 to 12,5m.

· Gauge length - in the range of off-gauge length pipe with + 15mm length limit deviations;

· Multiple gauge length – in the range of gauge length with 5 mm allowance for each cut and +15mm full-length deviation. Minimum multiple length is 300mm

Pipes are made of steel with chemical composition as per GOST 5632. It is allowed to fabricate pipes with rear-earth metals microadding.

· Gauge length – from 5 to 9m

· Gauge length with surplus – not more than 10 % (in weight) of off-gauge length pipe

· Multiple gauge length – up to 9 m and with 5 mm allowance for each cut which is included into each multiple length;

· Multiple length with surplus – not more than 10 % (in weight) of off-gauge length pipe

· Off gauge length - from 1.5 to 9 m

· 08Õ18Í10Ò, 10Õ18Í10Ò, 12Õ18Í10Ò, 03Õ18Í10Ò, 08Õ18Í10 - 7,9;

· 08Õ21Í6Ì2Ò - 7,85;

· 10Õ17Í13Ì2Ò, 10Õ17Í13Ì3Ò, 03Õ17Í113Ì2Ò, 03Õ17Í14Ì3 - 8,0;

· 08Õ22Í6Ò - 7,6;

· 06ÕÍ28ÌÄÒ - 7,95;

· 04Õ17Ò, 08Õ18Ò1 - 7,72.

Pipes are fabricated of 10Õ18Í10Ò è 04Õ17Ò steel grades with chemical composition as per GOST 11068-81; and

08Õ18Í10Ò, 08Õ18Ò1, 08Õ18Í10, 12Õ18Í10Ò, 10Õ17Í13Ì2Ò, 10Õ17Í13Ì3Ò, 08Õ22Í6Ò, 08Õ21Í6Ì2Ò, 06ÕÍ28ÌÄÒ, 08Õ17Í13Ì2Ò, 03Õ17Í14Ì3, 03Õ18Í10Ò steel grades as per GOST 5632 - 72 .