IPK PUBLISHING STANDARDS STATE STANDARD OF THE UNION OF SSR
STEEL ELECTRO-WELDED STRAWS.
Assortment.
1. This Standard establishes assortment of steel electrically welded stitches.
2. The dimensions of the pipes should correspond to Table. 1 .
3. The length of the pipe produced: an unlimited length:
- with a diameter of up to 30 millimeters - no less than e 2 m;
- with a diameter of c. 30 to 70 millimeters - not less than 3 m;
- with a diameter of st. 70 to 152 millimeters - not less than 4 m;
- with a diameter of st. 152 millimeters - not less than 5 m.
At customer's request, pipes of groups A and B according to GOST 10705 with a diameter from above 152 millimeters are manufactured with a length of at least 10 m; pipes of all groups up to 70 mm in diameter - not less than 4 m long;
- dimensional length:
- with a diameter of up to 70 millimeters - from 5 to 9 m;
- with a diameter of st. 70 to 219 millimeters - from 6 to 9 meters;
- with a diameter of st. 219 to 426 millimeters - from 10 to 12 meters.
Pipes with diameters in excess of 426 millimeters produce only an unlimited length. With the agreement of the manufacturer and the customer, pipes with diameters in excess of 70 to 219 millimeters are allowed to be manufactured from 6 to 12 m; fold length, a multiplicity of at least 250 millimeters and not exceeding the lower limit. installed for measuring pipes. The allowance for each cut is set to 5 millimeters (unless another allowance is specified) and is included in each multiplicity. To calculate the weight of the pipe, or the length of the pipe, you can use pipe calculator.
Table 1
Continuation of Table. 1
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Outside diameter. millimeters |
Theoretical mass of 1 m of pipes. kg. at wall thickness. millimeters |
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Continuation of Table. 1
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Outside diameter. millimeters |
Theoretical mass of 1 m of pipes. kg. at wall thickness. millimeters |
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Continuation of Table. 1
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Outside diameter. millimeters |
Theoretical mass of 1 m of pipes. kg. at wall thickness. millimeters |
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Continuation of Table. 1
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Outside diameter. millimeters |
Theoretical mass of 1 m of pipes. kg. at wall thickness. millimeters |
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Continuation of Table. 1
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Outside diameter. millimeters |
Theoretical mass of 1 m of pipes. kg. at wall thickness. millimeters |
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Continuation of Table. 1
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Outside diameter. millimeters |
Theoretical mass of 1 m of pipes. kg. at wall thickness. millimeters |
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Continuation of Table. 1
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Outside diameter. millimeters |
Theoretical mass of 1 m of pipes. kg. at wall thickness. millimeters |
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Notes:
1. When making pipes according to GOST 10706, the theoretical mass is increased by 1% due to reinforcement of the seam.
2. Upon agreement of the manufacturer with the customer, pipes with dimensions of 41.5 ґ1.5-3.0 are manufactured; 43 ґ1.0; 1.53.0; 43.5 ґ1.5-3.0; 52 ґ2.5; 69.6 ґ1.8; 111.8 ґ2.3; 146.1 ґ5.3; 6.5; 7.0; 7.7; 8.5; 9.5; 10.7; 152.4 ґ1.9; 2.65; 168 ґ2.65; 177.3 ґ1.9; 198 ґ2.8; 203 ґ2.65; 299 ґ4.0; 530 ґ7.5; 720 ґ7.5; 820 ґ8.5; 1020 ґ9.5; 15.5; 1220 ґ13.5; 14.6; 15.2 millimeters. and also with an intermediate thickness of the wall and diameters within the limits of Table. 1.
3. The size of the pipes in the new design is not recommended.
3.1. Pipes of a measured and multiple length produce two classes of accuracy:
- I - with trimming ends and deburring;
- II - without picking and deburring (with cutting in the line of the mill).
3.2. Limit deviations along the length of the measuring pipes are given in Table. 2.
table 2
3.3. Limit deviations for the total length of multiple tubes should not exceed:
- + 15 millimeters - for pipes of accuracy class I;
- + 100 millimeters - for pipes of class II accuracy.
3.4. At the customer's request, pipes of dimensional and multiple lengths of II class of accuracy, should be with tapered ends and with one or two sides.
4. Limit deviations in the outer diameter of the pipe are given in Table. 3.
Table 3
Note. For diameters. controlled by measuring the perimeter. The largest and smallest perimeter limits are rounded to within 1 millimeter.
5. At the customer's request, the pipes according to GOST 10705 are manufactured with one-sided or offset tolerance for the external diameter. One-sided or offset tolerance must not exceed the sum of marginal deviations. shown in Table. 3.
6. The maximum deviations in the wall thickness should correspond to:
± 10% - with pipe diameters up to 152 millimeters;
GOST 19903 - with a pipe diameter of more than 152 millimeters for a maximum sheet width of normal accuracy.
Upon agreement between the consumer and the manufacturer, pipes with one-sided tolerance along the wall thickness are allowed. the one-sided tolerance must not exceed ss of the sum of the limiting deviations in the wall thickness.
7. For pipes with diameters in excess of 76 millimeters, the wall may be thickened by 0.15 millimeters.
8. Pipes for pipelines with a diameter of 478 millimeters or more. made according to GOST 10706. are delivered with the maximum deviations in the external diameter of the ends. shown in Table. 4.
Table 4
9. Ovality and equipotence of pipes up to 530 millimeters in diameter. made in accordance with GOST 10705. There should be no more than maximum deviations, respectively, in the external diameter and wall thickness.
Pipes with a diameter of 478 millimeters or more. made in accordance with GOST 10706. There must be three classes of accuracy in the ovality. Ovality of pipe ends should not exceed:
- 1% of the outer diameter of the pipes for the 1st accuracy class;
- 1.5% of the outer diameter of the pipes for the 2nd accuracy class;
- 2% of the outer diameter of the pipes for the 3rd class of accuracy.
The ovality of the ends of pipes with a wall thickness of 0.0.0 mm in diameter is determined by the manufacturer's agreement with the consumer.
10. Curvature of pipes. manufactured in accordance with GOST 10705. It should not exceed 1.5 millimeters per 1 m of length. At the consumer's request, the curvature of pipes up to 152 millimeters in diameter should be no more than 1 millimeter per 1 meter of length.
The total curvature of the pipes. manufactured in accordance with GOST 10706. It should not exceed 0.2% of the pipe length. The curvature per 1 m of the length of such pipes is not determined.
11. Technical requirements must comply with GOST 10705 and GOST 10706.
Examples of notation:
Pipe with an outer diameter of 76 millimeters. wall thickness of 3 millimeters. dimensional length. II class accuracy in length. of steel grade St3sp. made according to group B of GOST 10705-80:
Note. In the conventions of pipes. past thermal treatment throughout the volume. after the words "pipe" is added the letter T; pipes. past local heat treatment of the welded seam. - the letter L. is added.
INFORMATION DATA
1. DEVELOPED AND IMPLEMENTED by the Ministry of Metallurgy of the USSR
DEVELOPERS
V.P. Sokurenko. Cand. tech. sciences; V.M. Crow. Cand. tech. Sciences; P. N. Ivshin. Cand. tech. Sciences; NF Kuzenko. VF Ganzina
Pipes welded straight (GOST 10704-91 and 10705-80) can be made in several different groups with additional heat treatment or without it.
1 Steel electric welded longitudinal pipes - GOST 10705-80
This State Standard provides information on the assortment and technology for the manufacture of welded-in welded pipe products that have a diameter of 10 to 530 millimeters. They are made from low-alloyed and for use in a variety of construction and other structures, as elements of pipelines and different in their purpose products.
Note that GOST 10705-80 "do not obey" the pipes used to produce electric heaters. By qualitative characteristics, the steel pipe is straight-through (GOST 10704-91 and 10705-80) is classified as one of four groups. The products of the "A" group are produced according to the Gosstandart 380 from half-quiet, calm and boiling steel 1, 2, 3 and 4. Finished products are produced with the normalization of mechanical parameters. The products of the "B" group are made by:
- according to the State Standard 9045 from steel 08Yu;
- according to the standard 380 from St1-St4;
- according to the standard 19281 of steels with a low level of doping, in which the carbon should not be more than 0.46 percent (thus making pipes with a cross section of more than 114 mm);
- according to the State Standard 1050 from St10, 08, 20 and 15 (cn, kp, ps).
Also, the products of group "B" (all of which are necessarily normalized by their chemical composition) are made of steel 22GYU, which has the following chemical composition (in percent):
- from 1,2 to 1,4 - manganese;
- from 0,15 to 0,22 - carbon;
- 0.03 - titanium;
- from 0,15 to 0,3 - silicon;
- from 0,02 to 0,05 - aluminum;
- up to 0.02 - phosphorus and calcium;
- up to 0,4 - chromium;
- up to 0,01 - sulfur;
- up to 0,012 - nitrogen.
The pipes of the "B" group are normalized both for the chemical composition and for the mechanical characteristics. At the same time, their manufacture is made of steels that are used for making the products of the "B" group. In addition, the pseudo-tubular constructions may be of the "D" group. In this case, they are normalized according to the indices of the hydraulic test pressure.
GOST states that:
- pipes made of steels with a small number of alloying elements can be produced both without additional heat treatment, and with it (for example, c), the treatment being performed throughout the welded joint or in the volume of the structure);
- also processed by elevated temperatures and products made of carbon steel, but they can also be reduced by hot technology, but products from St1 never go through heat treatment;
- combine, which produces electrically welded structures, has the right to independently choose a specific heat treatment option, it is allowed to conduct it even in a protective environment, but under a preliminary contract with the buyer of the finished product.
2 Special requirements for welded pipes with a straight seam according to GOST 10705
The finished pipe products are subject to the following requirements of the State Standard:
- On their surfaces there should be no sunsets, cracks, flaws and captivity. If the pipes are processed at a high temperature, an oxide film is allowed on the products. In this case, the presence of scale is not allowed.
- In those cases where the scraping traces, small risks, nicks, scales, ruffles, dents do not lead to the cross-section of the pipe structure and the thickness of its wall for acceptable deviations, they can be present on the products.
- The zone of welding is necessarily cleaned, also seam joints are welded.
- Edges can be displaced with respect to the wall thickness (nominal) by no more than 10 percent. For pipes with a cross section of 159 mm, the permissible displacement index is increased to 20 percent.
The mechanical parameters of the base steel for hot-tempered and heat-treated products vary depending on the brand:
- relative elongation: from 20 (steel 26ХМА, 17Г1С, 09Г2С, 20Ф, 13ХФА) to 30 (08Ю) percent;
- yield strength: from 174 (08Yu and 08kp) to 343 (26XMA, 17G1S, etc.) N / mm2;
- resistance (temporary) to break: from 255 to 490 kgf / mm 2.
Mechanical characteristics of low-alloy alloys and 22GY steel can differ from standard ones in agreement with consumers.
To other important provisions of the document describing the process of production of longitudinal pipes, the following requirements apply:
- one suture is allowed in the transverse direction on products with a section of 57 mm;
- if the heat-treated pipes are subjected to repair by welding, they must be re-worked by the same method or by seam or by volume;
- it is necessary to remove the outer bead on the products;
- from the ends of the structures remove the barbs (by stripping), the pipes at a right angle are pruned.
3 Welded straight pipes - GOST 10704-91
This official document establishes the dimensions of pipe products manufactured from steels according to GOST 10705, as well as their maximum deviations from standard values and the range of electric welded pipes. From it you can find out that the finished products are manufactured below the given parameters:
- diameter (outside): 10-1420 mm;
- length: non-dimensional - 2-5 m, depending on the section of the pipe, measuring - 5-12 m; multiplicity (the multiplicity should not be above the lower limit of the measured length and at the same time have a multiplicity of 25 cm and more);
- wall thickness: 1-32 mm;
- weight (theoretical) of one kilogram of finished products: varies from 0.222 kg for a pipe with a wall of 1 mm and a section of 10 mm to 779 kg for products with a wall of 32 mm and a section of 1020 mm.
It is important to know that when the products are manufactured according to Gosstandart 10706, the weight of the pipes is large for all products, which is due to the need to strengthen the weld.
By the length (dimensional) deviation of the pipe structures can be as follows:
- +5 cm for products of the 2nd class and +1 cm of the 1st class (pipes with a length of less than 6 meters);
- +7 and +1.5 cm for pipes longer than 6 meters.
On the multiple length of the deviation, which the standard allows, are +10 cm for products of the 2nd class and +1.5 cm for the 1st, regardless of the length of the structure. Under the pipes of the 1st class we mean products with deburring and with cut ends, 2nd class - without removing burrs and clamping.
The accuracy of manufacturing a welded welded pipe according to GOST 10704-91 is:
- increased;
- usual.
The accuracy of production is taken into account when describing the permissible deviations of finished products from their diameter (external):
- pipes more than 1020 mm: ± 6.0 mm (increased accuracy) and ± 0, 6% (conventional);
- 426-1020: ± 0.65% and ± 0.7%;
- 193.7-426: ± 0.65% and ± 0.75%;
- 51-193.7: ± 0.7% and ± 0.8%;
- 30-51: ± 0.35 mm and ± 0.4 mm;
- 10-30: ± 0.25 mm and ± 0.3 mm.
Pipes of cross section less than 10 mm of usual accuracy can have deviations up to ± 0,2 mm, for high-precision products deviations are not provided.
The difference and the size of the ovality of electrowelded products with a section not exceeding 530 mm is possible not higher than the allowed deviations in the wall thickness and the outer section, respectively. But the curvature of the pipes can not be more than 1.5 mm per one meter of their length. For products that are intended to be used in critical structures as component elements, the curvature must be even smaller - up to 1 mm.
Electrically welded steel line-weld tubes. Range
GOST 10704-91
OKP 13 7300, 13 8100, 13 8300
Date of introduction 01.01.93
1. This standard specifies the range of steel electrically welded, longitudinal welded pipes.
2. The dimensions of the pipes should correspond to Table. 1.
3. The length of the pipe produced: an unlimited length:
with a diameter of up to 30 mm - not less than 2 m; with a diameter of st. 30 to 70 mm - not less than 3 m; 70 to 152 mm - not less than 4 m; 152 mm - not less than 5 m.
At the customer's request, pipes of groups A and B in accordance with GOST 10705 with a diameter of more than 152 mm are manufactured with a length of at least 10 m; pipes of all groups up to 70 mm in diameter - not less than 4 m in length, measuring length:
with diameter up to 70 mm - from 5 to 9 m;
with a diameter of st. 70 to 219 mm - from 6 to 9 m;
with a diameter of st. 219 to 426 mm - from 10 to 12 m.
Pipes with diameters in excess of 426 mm produce only an unlimited length. With the agreement of the manufacturer and the customer, pipes with diameters in excess of 70 to 219 mm are allowed to be manufactured from 6 to 12 m;
of a multiple length of at least 250 mm and not exceeding the lower limit set for measuring pipes. The allowance for each cut is set to 5 mm (if the other allowance is not specified) and is included in each multiplicity.
Table 1
Continuation of Table. 1
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Note:
1. When making pipes according to GOST 10706, the theoretical mass is increased by 1% due to reinforcement of the seam.
2. Upon agreement of the manufacturer with the customer, pipes are produced with the sizes 41.51.5-3.0; 43 1.0, 1.5-3.0; 43.51.5 - 3.0; 52 2.5; 69.61.8; 111.8 2.3; 146.15.3; 6.5; 7.0; 7.7; 8.5; 9.5; 10.7; 152.41.9; 2.65, 1682.65; 177.31.9; 1982.8; 203 2.65; 299.0.0; 530 7.5; 720 7.5; 820 8.5; 1020 9.5; 15.5; 1220 13.5; 14.6, 15.2 mm, and also with an intermediate wall thickness and diameters within the limits of Table. 1.
3. The dimensions of the pipes, enclosed in parentheses, are not recommended for new design.
3.1. Pipes of a measured and multiple length produce two classes of accuracy along the length:
I - with trimming ends and deburring;
II - without picking and deburring (with cutting in the line of the mill).
3.2. Limit deviations along the length of the measuring pipes are given in Table. 2.
Table 2
3.3. Limit deviations for the total length of multiple tubes should not exceed:
15 mm - for pipes of accuracy class I;
100 mm - for pipes of class II accuracy.
3.4. At the request of the customer, the pipes of a dimensional and multiple lengths of II class of accuracy should be with tapered ends on one or both sides.
4. Limit deviations in the outer diameter of the pipe are given in Table. 3.
Table 3
NOTE For diameters controlled by perimeter measurement, the largest and smallest perimeter limits are rounded to within 1 mm.
5. At the customer's request, the pipes according to GOST 10705 are manufactured with one-sided or offset tolerance for the external diameter. A unilateral or offset tolerance shall not exceed the sum of the limiting deviations given in Table. 3.
6. The maximum deviations in the wall thickness should correspond to:
± 10% - with pipe diameters up to 152 mm;
GOST 19903 - with a pipe diameter of more than 152 mm for a maximum sheet width of normal accuracy.
Upon agreement between the user and the manufacturer, it is allowed to manufacture pipes with one-sided tolerance for the wall thickness, with the unilateral tolerance not exceeding the sum of the limiting deviations in the wall thickness.
7. For pipes with a diameter greater than 76 mm, a wall thickness of 0.15 mm in the grate is allowed.
8. Pipes for pipelines with a diameter of 478 mm and more, manufactured in accordance with GOST 10706, are supplied with limiting deviations in the external diameter of the ends, given in Table. 4.
9. The ovality and equiactivity of pipes up to 530 mm in diameter, manufactured by POGOST 10705, should not be more than the maximum deviations, respectively, according to the outer diameter and wall thickness.
Pipes with a diameter of 478 mm and more, manufactured in accordance with GOST 10706, should have three classes of accuracy in the ovality. Ovality of pipe ends should not exceed:
1% of the outer diameter of the pipes for the 1st accuracy class;
1.5% of the outer diameter of the pipes for the 2nd accuracy class;
2% of the outer diameter of the pipes for the 3rd class of accuracy.
The ovality of the ends of pipes with a wall thickness of less than 0.01 of the outer diameter is determined by the manufacturer's agreement with the consumer.
10. Curvature of pipes manufactured in accordance with GOST 10705, should not exceed 1.5 mm per 1 m of length. At the customer's request, the curvature of pipes up to 152 mm in diameter should not be more than 1 mm per 1 minute.
The total curvature of pipes manufactured in accordance with GOST 10706 should not exceed 0.2% of the length of the pipe. The curvature per 1 m of the length of such pipes is not determined.
11. Technical requirements must comply with GOST 10705 and GOST 10706.
EXAMPLES OF ULTIMATE OBSERVATIONS
Pipe outer diameter of 76 mm, wall thickness of 3 mm, measuring length, II grade accuracy in length, made of steel St3sp, manufactured according to group B GOST 10705-80:
The same, increased accuracy in the outer diameter, length, divisible by 2000 mm, I class accuracy by length, made of steel grade 20, manufactured according to group B GOST 10705-80:
Pipe outer diameter 25 mm, wall thickness 2 mm, length, divisible by 2000 mm, II class of accuracy in length, manufactured according to group D GOST 10705-80:
Pipe outer diameter 1020 mm, increased precision manufacturing, wall thickness 12 mm, increased accuracy in the outer diameter of the ends, the second class of accuracy in the ovality, unlimited length, made of steel StZsp, manufactured according to group B GOST 10706-76:
Note: In the legend for tubes that have been thermally processed throughout the volume, the letter T is added after the words "pipe"; pipes that have undergone a local heat treatment of the welded seam, the letter L.
INFORMATION DATA
1. DEVELOPED AND INCLUDED BY THE MINISTRY OF METALLURGY OF THE USSR DISTRIBUTORS
VP Sokurenko, Cand. tech. sciences; VM Voron, Cand. tech. sciences; P. N. Ivshin, Cand. tech. sciences; NF Kuzenko, VF Ganzina