The types and sizes of steel pipes

Welded rental direct suture

Steel Pipe rolling may differ depending on the method of production and are divided into:

1. welded welded
2. welded spiral seam
3. cold
4. hot

Next, look at eachitem details

In accordance with GOST 10704-91 assumed production of longitudinal welded pipes.This standard specifies the most important parameters of the pipe rolled in this group - cross-sectional size, length, allowable deviation from the standard dimensions.According to the GOST there are more than 80 sizes, which differ only in diameter.Describes a range of pipe rolled from 10 mm to 1420 mm.The largest deviation in either direction shall not exceed 0.8% in the standard of accuracy and 0.7% with increased accuracy.

Regarding the length of the finished product, it may be as dimensional and unmeasured.Unmeasured characteristic only for the rental with a diameter up to 152 mm.The rate is only available for a minimum length of which depends on the diameter of the pipe:

• minimal amount of time available for hire with a diameter of up to 70mm in the range of 5-7 m;
• for diameter 70-219 mm length is 6 and 9m;
• 42cm section for products manufactured in lengths of 6 and 12 m.

Spiral welded steel pipe

Dimensions of pipes manufactured by welding a spiral seam, indicated in the normative document GOST 8696-74, which describes the size 21products.According to this normative document is equal to the minimum cross section of 159 mm, and the maximum - 2520 mm.The length of the spiral pipe is recommended between 10 and 12 m. The permissible deviation of dimensions does not exceed 0.3%.

seamless cold-rolled or cold

Products manufactured by cold rolled, normalized by GOST 8734-75.This normative document defines the most important parameters - the outer and inner diameter, wall thickness, length of the finished product, deviations from the standard.

GOST 8734-75 is considering more than 70 sizes of steel pipes with a diameter of 5 mm to 250 mm.Measuring the length of cold-rolled products may be 4.5 m or 9 m, and the off-gage varies from 1.5 to 11.5 m. Since the consumer is mainly interested in the diameter of the pipe, both external and internal, is in production at the finish rolling of calibrated onlythis option.Deviations from predetermined dimensions between 0.8% diameter, 10% of the wall thickness and rolled from 10mm length.

Seamless hot rolled steel tubes

for pipes made by hot rolling technology, suitable normative document GOST 8732-78.It determines all the typical dimensions of steel pipes, which are about 70. The diameter of pipes for hot technology is defined in the range from 20 mm to 55 mm, the wall thickness is defined for sizes 50 and varies within 2.5 - 75 mm.Standard measuring length must be from 4 m to 12.5 m. These products are referred to as off-gage rental.

Acceptable standards deviations are set based on the diameter of the steel pipe.For the cross section of less than 219 mm maximum deviation of 0.8% for products with a cross section over 219 mm a deviation of 1.25%.Wall thickness deviation can be from 10 to 12%.