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GOST 3728-78

GOST R ISO 15353-2014 GOST P 55080-2012 GOST R ISO 16962-2012 GOST R ISO 10153-2011 GOST R ISO 10280-2010 GOST R ISO 4940-2010 GOST R ISO 4943-2010 GOST R ISO 14284-2009 GOST R ISO 9686-2009 GOST R ISO 13899-2-2009 GOST 18895-97 GOST 12361-2002 GOST 12359-99 GOST 12358-2002 GOST 12351-2003 GOST 12345-2001 GOST 12344-88 GOST 12350-78 GOST 12354-81 GOST 12346-78 GOST 12353-78 GOST 12348-78 GOST 12363-79 GOST 12360-82 GOST 17051-82 GOST 12349-83 GOST 12357-84 GOST 12365-84 GOST 12364-84 STATE STANDARD P 51576-2000 GOST 29117-91 GOST 12347-77 GOST 12355-78 GOST 12362-79 GOST 12352-81 GOST P 50424-92 STATE STANDARD P 51056-97 GOST P 51927-2002 GOST P 51928-2002 GOST 12356-81 GOST R ISO 13898-1-2006 GOST R ISO 13898-3-2007 GOST R ISO 13898-4-2007 GOST R ISO 13898-2-2006 STATE STANDARD P 52521-2006 GOST P 52519-2006 GOST R 52520-2006 GOST P 52518-2006 GOST 1429.14-2004 GOST 24903-81 GOST 22662-77 GOST 6012-2011 GOST 25283-93 GOST 18318-94 GOST 29006-91 GOST 16412.4-91 GOST 16412.7-91 GOST 25280-90 GOST 2171-90 GOST 23401-90 GOST 30642-99 GOST 25698-98 GOST 30550-98 GOST 18898-89 GOST 26849-86 GOST 26876-86 GOST 26239.5-84 GOST 26239.7-84 GOST 26239.3-84 GOST 25599.4-83 GOST 12226-80 GOST 23402-78 GOST 1429.9-77 GOST 1429.3-77 GOST 1429.5-77 GOST 19014.3-73 GOST 19014.1-73 GOST 17235-71 GOST 16412.5-91 GOST 29012-91 GOST 26528-98 GOST 18897-98 GOST 26529-85 GOST 26614-85 GOST 26239.2-84 GOST 26239.0-84 GOST 26239.8-84 GOST 25947-83 GOST 25599.3-83 GOST 22864-83 GOST 25599.1-83 GOST 25849-83 GOST 25281-82 GOST 22397-77 GOST 1429.11-77 GOST 1429.1-77 GOST 1429.13-77 GOST 1429.7-77 GOST 1429.0-77 GOST 20018-74 GOST 18317-94 STATE STANDARD P 52950-2008 GOST P 52951-2008 GOST 32597-2013 GOST P 56307-2014 GOST 33731-2016 GOST 3845-2017 STATE STANDARD P ISO 17640-2016 GOST 33368-2015 GOST 10692-2015 GOST P 55934-2013 GOST P 55435-2013 STATE STANDARD P 54907-2012 GOST 3845-75 GOST 11706-78 GOST 12501-67 GOST 8695-75 GOST 17410-78 GOST 19040-81 GOST 27450-87 GOST 28800-90 GOST 3728-78 GOST 30432-96 GOST 8694-75 GOST R ISO 10543-99 GOST R ISO 10124-99 GOST R ISO 10332-99 GOST 10692-80 GOST R ISO 17637-2014 GOST P 56143-2014 GOST R ISO 16918-1-2013 GOST R ISO 14250-2013 GOST P 55724-2013 GOST R ISO 22826-2012 GOST P 55143-2012 GOST P 55142-2012 GOST R ISO 17642-2-2012 GOST R ISO 17641-2-2012 GOST P 54566-2011 GOST 26877-2008 GOST R ISO 17641-1-2011 GOST R ISO 9016-2011 GOST R ISO 17642-1-2011 STATE STANDARD P 54790-2011 GOST P 54569-2011 GOST P 54570-2011 STATE STANDARD P 54153-2010 GOST R ISO 5178-2010 GOST R ISO 15792-2-2010 GOST R ISO 15792-3-2010 GOST P 53845-2010 GOST R ISO 4967-2009 GOST 6032-89 GOST 6032-2003 GOST 7566-94 GOST 27809-95 GOST 22974.9-96 GOST 22974.8-96 GOST 22974.7-96 GOST 22974.6-96 GOST 22974.5-96 GOST 22974.4-96 GOST 22974.3-96 GOST 22974.2-96 GOST 22974.1-96 GOST 22974.13-96 GOST 22974.12-96 GOST 22974.11-96 GOST 22974.10-96 GOST 22974.0-96 GOST 21639.9-93 GOST 21639.8-93 GOST 21639.7-93 GOST 21639.6-93 GOST 21639.5-93 GOST 21639.4-93 GOST 21639.3-93 GOST 21639.2-93 GOST 21639.0-93 GOST 12502-67 GOST 11878-66 GOST 1763-68 GOST 13585-68 GOST 16971-71 GOST 21639.10-76 GOST 2604.1-77 GOST 11930.7-79 GOST 23870-79 GOST 11930.12-79 GOST 24167-80 GOST 25536-82 GOST 22536.2-87 GOST 22536.11-87 GOST 22536.6-88 GOST 22536.10-88 GOST 17745-90 GOST 26877-91 GOST 8233-56 GOST 1778-70 GOST 10243-75 GOST 20487-75 GOST 12503-75 GOST 21548-76 GOST 21639.11-76 GOST 2604.8-77 GOST 23055-78 GOST 23046-78 GOST 11930.11-79 GOST 11930.1-79 GOST 11930.10-79 GOST 24715-81 GOST 5639-82 GOST 25225-82 GOST 2604.11-85 GOST 2604.4-87 GOST 22536.5-87 GOST 22536.7-88 GOST 6130-71 GOST 23240-78 GOST 3242-79 GOST 11930.3-79 GOST 11930.5-79 GOST 11930.9-79 GOST 11930.2-79 GOST 11930.0-79 GOST 23904-79 GOST 11930.6-79 GOST 7565-81 GOST 7122-81 GOST 2604.3-83 GOST 2604.5-84 GOST 26389-84 GOST 2604.7-84 GOST 28830-90 GOST 21639.1-90 GOST 5640-68 GOST 5657-69 GOST 20485-75 GOST 21549-76 GOST 21547-76 GOST 2604.6-77 GOST 22838-77 GOST 2604.10-77 GOST 11930.4-79 GOST 11930.8-79 GOST 2604.9-83 GOST 26388-84 GOST 14782-86 GOST 2604.2-86 GOST 21639.12-87 GOST 22536.8-87 GOST 22536.0-87 GOST 22536.3-88 GOST 22536.12-88 GOST 22536.9-88 GOST 22536.14-88 GOST 22536.4-88 GOST 22974.14-90 GOST 23338-91 GOST 2604.13-82 GOST 2604.14-82 GOST 22536.1-88 GOST 28277-89 GOST 16773-2003 GOST 7512-82 GOST 6996-66 GOST 12635-67 GOST 12637-67 GOST 12636-67 GOST 24648-90

GOST 3728−78 Pipe. Test method for bend (with Amendments No. 1, 2)


GOST 3728−78

Group В69

INTERSTATE STANDARD

PIPE

Test method for bend

Tubes. Method of bend-over test


ISS 23.040.10
AXTU 1309

Date of introduction 1979−07−01

The decision of the State standards Committee of the USSR Council of Ministers No. 474 17.02.78 from the date of introduction is established 01.07.79

Limitation of actions taken by Protocol No. 7−95 Interstate Council for standardization, Metrology and certification (ICS 11−95)

REPLACE GOST 3728−66

EDITION (September, 2010) with Changes No. 1, 2 approved in April 1980 and April 1985 (ICS 5−80, 7−85)

This standard covers metal pipe of circular cross section and sets the test method for bend to specified size and shape at a temperature of (20ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2))°C.

The standard fully complies ST SEV 480−77 in terms of test bends.

(Changed edition, Rev. N 1).

1. SAMPLING METHOD


1.1. Testing bend pipe with outer diameter ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)to 60 mm inclusive of selected samples in a segment of pipe of total cross section (Fig.1), tubes with external diameter over 60 mm, the samples in the form of transverse or longitudinal stripes.

(Changed edition, Rev. N 1).

Damn.1. Bend pipe sections

Bend pipe sections

ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)

1 — sample-nozzle; 2 — cylindrical mandrel; ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2) — the bending radius of the pipe on the middle line

Damn.1

1.2. The sample in the form of a tube segment cut from the end of a pipe length sufficient for it to bend in a predetermined angle and radius.

1.3. When the thickness of the tube wall is ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)5 mm wide longitudinal strips and transverse specimens shall be 10 mm When the wall thickness of pipe ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)5 mm sample width must be 2ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2).

At mass control testing pipes with wall thickness more than 5 mm to facilitate fabrication of samples to groups of samples of different thickness are allowed to set the same width equal to twice the maximum thickness of this group. By thickness is recommended with an interval of 5 mm.

(Changed edition, Rev. N 1).

1.4. Samples in the form of longitudinal strips and transverse samples from welded pipes cut outside the heat affected zone of the weld. Longitudinal strips should be cut out from a portion of the base metal angle of at least 90° from the position of the weld.

2. TESTING

2.1. The test is carried out by a smooth continuous bend of the sample around a grooved roller or mandrel of a given radius ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)to a certain angle. The profile of the groove or of the mandrel must match the outside diameter of the test sample. If a normative-technical documentation for pipe requirements to limit the magnitude of the ovalization of the cross section of the pipe during the test is allowed to test with the use of an internal mandrel or filler.

2.2. The bend angle ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)of the sample taken as equal to 90°, if in the normative-technical documentation for pipe not installed another angle.

2.3. The bending radius of sample in a segment of pipe pointing in the normative-technical documentation on the pipe. In the absence of such instructions, the bending radius of pipes from steels with elongation not less than 21% determined according to the table.1.

Table 1

     

Ratio of pipe wall thickness
to the outside diameter of pipe ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2), mm

Outer diameter of pipe ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2), mm

Bending radius ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2),
mm

0.1 and more Up to 50

2ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)

  SV. 50

3ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)

Less than 0.1
Up to 60 incl.

3ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)

(Changed edition, Rev. N 2).

2.4. When testing welded pipes the position of the weld must be specified in normative and technical documentation for the product. If this instruction corresponds to, the weld should be in compression and positioned at an angle of 45° to the plane of bending.

2.5. Testing of the weld metal and metal of the heat affected zone of the bend is carried out according to GOST 6996−66.

2.6. Test longitudinal bend specimens is carried out according to GOST 14019−2003.

Test transverse bend specimens (Fig.2) (strip in the form of the ring) is carried out according to GOST 14019−2003.

Damn.2. Transverse bend specimens

Transverse bend specimens

ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)

1 — mandrel; 2 — cross pattern; 3 — bearing; ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2) — distance between the supports

Damn.2

2.7. The mandrel radii for bend longitudinal strips and transverse specimens ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)depending on the wall thickness of the pipe shall be as specified in table.2. While stretching efforts should be subject to the sample side, which is the outer surface of the pipe.

Table 2

   
Wall thickness of pipe, mm
The radius of mandrel, mm
1,0−1,2
2,5
1,4−1,5
3,0
1,6
3,5
1,8−2,0
4,0
2,2
4,5
2,5
5,0
2,8
5,5
3,0
6,0
3,2
6,5
3,5
7,0
4,0
7,5
4,5
8,5
5,0
9,0
5,5
9,5
6,0
10,5
6,5
11,0
7,0−7,5
12,0
Over 7.5

2ГОСТ 3728-78 Трубы. Метод испытания на загиб (с Изменениями N 1, 2)


The transverse bend samples produced thus, to increase the initial curvature of the sample.

(Changed edition, Rev. N 1).

2.8. A sample is considered satisfactory if, after bending it will not be visually detected violation of the integrity of metal with metallic luster.

The inadmissibility of the corrugations should be specified in the normative-technical documentation for pipe.

(Changed edition, Rev. N 2).

3. TEST REPORT


In the test report indicate:

— material and size of pipe;

— the results obtained.

(Added, Rev. N 1).