Are you interested in GOST 8732-78? Supplier Evek GmbH offers to buy seamless hot-deformed steel pipe of domestic and foreign production at an affordable price in a wide range. Provide delivery of products anywhere in the continent. Price is optimal.

General

The requirements of GOST 8732-78 apply to hot-worked seamless steel pipe of general purpose, made by outside diameter, wall thickness and length. Tubes shall be manufactured as to length:

• of off-gauge length - in the range of 4-12,5 m;
• of off-gauge length - within off-gauge;
• multiple of measured length - within measured length with 5 mm allowance for every cut;
• approximate length - within the ungraded length.

Upon agreement with the customer, it is allowed to manufacture pipes of shorter than the unmeasured length. If the wall thickness is greater than 16 mm, the length of cut-to-length pipe shall be as agreed between the manufacturer and the customer. Tubes of approximate length shall be manufactured at the customer's request.
The deviation limits for measured length and multiple of measured lengths are as follows: +10 mm - for lengths up to 6 m; +15 mm - for lengths over 6 m or with outside diameter greater than 152 mm; ±500 mm - for approximate length.

Limit deviations

As agreed between the manufacturer and the customer the pipes can be manufactured with combined limit deviations, for example: by outside diameter with increased accuracy (GOST 9567) and wall thickness with normal accuracy. The supplier Evek GmbH offers to buy hot-deformed steel seamless pipes, GOST 8732-78 at an affordable price in a wide range. Provide product delivery anywhere in the continent. Price is optimal.

Ovality, differentness, curvature.

Ovality and differentness of pipes should not bring the size beyond the limit deviations in diameter and wall thickness. The curvature of any section of pipe per 1 m of length shall not exceed: 1.5 mm - for pipes with wall thickness up to 20 mm; 2.0 mm - for pipes with wall thickness over 20 to 30 mm; 4.0 mm - for pipes with wall thickness over 30 mm.

Limit deviations

Pipe assortment is rated for inner diameter and wall thickness, as well as outer and inner diameter and deviation. Inner diameter limits for pipe diameters 70-203 mm, walls 7-20 mm, and a ratio of diameter to wall thickness equal or less than 10 shall not exceed the respective outer diameter limits specified in the above tables. For other pipe sizes, the outside diameter tolerances shall be as agreed between the manufacturer and the customer.

Production

Seamless hot-rolled steel pipes as per GOST 8732-78 are manufactured from steels, technical requirements to which are specified in GOST 8731-74. Depending on quality indexes pipes shall be produced of the following groups:

• A - with standardized mechanical properties made of St2sp, St4sp, St5sp, St6sp steel grades;
• B - with standardization of chemical composition made of mild steel;
• C - with standardization of mechanical properties and chemical composition;
• D - with normalization of the chemical composition and control of mechanical properties on heat-treated samples. The norms of mechanical properties shall comply with those specified in the standards for steel;
• D - without standardization of mechanical properties and chemical composition, but with standardization of hydraulic test pressure.

As agreed with the customer the tubes are made of steel St3sp.

Notes

1.If the pipe wall is thicker than 45 mm, the mechanical properties shall be as agreed between the manufacturer and the customer.

2. The mechanical properties of steel grades not specified in the above tables, as well as standards of impact toughness and relative contraction for all steel grades shall be as agreed between the manufacturer and the consumer.

3. 3. The heat treatment treatment mode and the norms of mechanical properties are set according to the normative and technical documentation, approved in the established order.

Quality requirements

Cracks, foams, tears, and rolls are not allowed on the surface. Minor cracks, dents, risks, a thin layer of scale, traces of clearing of defects and small films are allowed, if they do not lead to the thickness of the wall beyond the minus deviations.

The ends shall be trimmed at right angles, chamfering at an angle of not less than 70° to the pipe axis is allowed. Pipe ends shall be deburred and chamfered when removed. Pipes with wall thickness of 20 mm or more can be cut with autogenous or plasma cutters or saws.

When cutting pipe with autogenous or plasma cutter, allowance along pipe length shall be no less than 20 mm for each cut.

Pipes with wall thickness of 20 mm and more manufactured from rolled or forged billets can be manufactured without cutting the ends, upon request of the customer. The uncut part of the pipe shall be marked with paint, and shall not be included in the pipe length at delivery.

By customer's request, the pipe ends subject to welding with wall thickness of 5 to 20 mm shall be chamfered at an angle of 35-40° to the face. At the same time should be left facing ring width of 1-3 mm.

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