GOST 3836-83
GOST 3836−83 electrotechnical unalloyed Steel thin sheet and bands. Specifications (with Change No. 1)
GOST 3836−83
Group B33
INTERSTATE STANDARD
ELECTROTECHNICAL UNALLOYED STEEL THIN SHEET AND BANDS
Specifications
Electrotechnical unalloyed steel thin sheet and bands. Specifications
ISS 77.140.45
OKP 09 8900
Date of introduction 1984−07−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of ferrous metallurgy of the USSR
2. APPROVED AND put INTO EFFECT by the State Committee USSR on standards from
3. REPLACE GOST 3836−73
4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
| The designation of the reference document referenced |
The number of the paragraph, subparagraph |
| GOST 503−81 |
2.2, 5.3 |
| GOST 7565−81 |
5.4 |
| GOST 7566−94 |
4.1, 4.7, 6.1 |
| GOST 10510−80 |
5.7 |
| GOST 11701−84 |
5.13 |
| GOST 12119.0−98 — GOST 12119.8−98 |
5.10, 5.11 |
| GOST 12503−75 |
5.8 |
| GOST 14019−80 |
5.7 |
| GOST 19851−74 |
2.2 |
| GOST 19903−74 |
2.1 |
| GOST 19904−90 |
2.1 |
| GOST 21650−76 |
6.1.4 |
| GOST 22536.0−87 |
5.5 |
| GOST 22536.1−88 |
5.5 |
| GOST 22536.4−88 |
5.5 |
| GOST 22536.5−87 |
5.5 |
5. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)
6. EDITION with Change No. 1, approved in December 1988 (IUS 4−89)
This standard applies to electrical unalloyed, hot-rolled and cold-rolled sheet steel and strip used in the magnetic circuits of electrical apparatus and appliances.
1. BRAND
1.1. Manufactures steel stamps: 10832, 20832, 11832, 21832, 10848, 20848, 11848, 21848, 10860, 20860, 11860, 21860, 10880; 20880,11880, 21880,10895, 20895, 11895, 21895.
In naming the brand numbers mean:
first — class structural condition and type of rolling: 1 — hot-rolled isotropic; 2 — cold-rolled isotropic;
second — type in silicon content: 0 — unalloyed steel, without standardization of the ageing coefficient; 1 — unalloyed steel with specified ageing coefficient;
the third group on the main standard characteristics: 8 — coercive force;
fourth and fifth — quantitative value of the main standard features: the 8-th group — the value of the coercive force in integer units of A/m.
1.2. Steel classification:
by product:
sheet;
roll;
the tape is cut;
tape;
cold-rolled steel sheet and strip in appearance and surface quality:
the first group — 1;
the second group — 2;
cold-rolled sheet steel:
with the control of internal defects.
without control of internal defects.
2. ASSORTMENT
2.1. Hot rolled steel sheet manufactured with a thickness of 2.0 to 3.9 mm inclusive, cold rolled steel — thickness of 0.5−3.9 mm inclusive and a width 500−1250 mm. hot-Rolled steel is manufactured in sheets, cold rolled steel in sheets and coils.
The form, dimensions and limit deviations of sheets and coils shall conform to the requirements of GOST and GOST 19903 19904.
2.2. Cold rolled strip manufacture with thickness from 0.1 mm to 2.0 mm inclusive. Dimensions and limit deviations must meet the requirements of GOST 503.
Cut the tape, obtained by dissolution of a roll, produce thickness 0.5−2.0 mm, inclusive. Shape, dimensions and limit deviations must meet the requirements of GOST 19851.
2.3. Tape and sheet steel are made with obraznymi edges. By agreement between manufacturer and consumer, they can be produced without trimming.
2.4. The camber of the tape, 1 m of length shall not exceed:
5 mm for widths up to 15 mm incl.
4 mm — at width more than 15 mm to 30 mm incl.
3 mm — at width more than 30 mm to 250 mm incl.
2 mm — at width more than 250 mm.
Examples of symbols
The cold-rolled strip of normal accuracy in thickness and width, edging, Nagarjuna, thickness 1.0 mm, width 15 mm, made of unalloyed electrotechnical steel brand 20880, 2nd group surface.
Steel hot-rolled sheet normal accuracy, improved flatness, cut edge, thickness 2.0 mm, width 760 mm and a length of 1450 mm of unalloyed electrotechnical steel brand 10864:
Steel cold-rolled sheet normal accuracy, improved flatness, cut edge, thickness of 1.0 mm, a width of 1250 mm and a length of 2000 mm of unalloyed electrotechnical steel brand 20848, 1st group of a surface, with control of internal defects:
3. TECHNICAL REQUIREMENTS
3.1. Electrotechnical unalloyed steel thin sheet and strip shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.
3.2. The contents of the main elements in steel should not exceed:
carbon — 0,04%;
the silicon — 0,3%;
for manganese is 0.3%.
3.3. Cold rolled strip and sheet steel manufactured without heat treatment (negativnye). Hot rolled steel is manufactured from etched surface.
At the customer’s request cold rolled strip produce thermally processed.
3.4. Tape and the steel plate should have smooth surface.
For hot rolled steel on the surface are not allowed: rust, Perera, loose scale, the curves giving a break; for cold-rolled steel, in addition, bubbles are not allowed cracks, slivers, shell and foreign matter.
Allowed color of a tint, moire and light layer after etching.
3.5. On the surface of the hot rolled sheets are allowed: General Rabina, minor scratches, films, prints from rolls, not bringing the leaves for the limit deviation on thickness.
3.6. On the surface of cold-rolled strips and sheet steel depending on the band surface allowed within half the limit deviations on thickness:
Rabina, fingerprints, and scratches nadawi — 1 group;
Rabina, prints, nadawi, scratches, slivers, and a separate small sink — 2 group.
3.7. On the edges of the sheet and coils should be free of cracks and chipping, putting them beyond the nominal widths.
For hot rolled sheets allowed the defect edges and angles, penetrating into the interior nominal contour of the sheet is not more than 1.5% of its linear dimensions.
On edges of steel sheets and strips are allowed burrs with a value of not more than the tolerance on the thickness.
(Changed edition, Rev. N 1).
3.8. The steel shall withstand the bending test at an angle of 90° without formation on the outer side of bending of snags and coarse roughness.
3.9. In cold-rolled sheet steel thickness 0,5−2,5 mm inclusive in ultrasonic inspection (UT) not allowed internal defects like rosslea, isolated more than 100 mm, and a total of more than 200 mm.
3.10. The magnetic properties of steel shall conform to the standards specified in table.1. Controlled characteristic is coercive force.
Table 1
| Steel grade | Thickness, mm |
Coercive force, a/m, no more |
The maximum magnetic permeability |
Magnetic induction, T, in magnetic field, A/m | ||||||
| MH/m |
(HS/E) |
500 |
1000 |
2500 |
5000 |
10000 |
30000 | |||
| not less than | ||||||||||
| 10895 |
0,1−3,9 incl. |
95,0 |
3,8 |
(3000) |
||||||
| 20895 |
||||||||||
| 11895 |
||||||||||
| 21895 |
||||||||||
| 10880 |
0,1−3,9 incl. |
80,0 |
5,0 |
(4000) |
||||||
| 20880 |
||||||||||
| 11880 |
||||||||||
| 21880 |
||||||||||
| 10860 |
0,1−3,9 incl. |
60,0 |
5,6 |
(4500) |
||||||
| 20860 |
1,38 |
1,50 |
1,62 |
1,71 |
1,81 |
Of 2.05 | ||||
| 11860 |
||||||||||
| 21860 |
||||||||||
| 10848 |
0,7−3,9 incl. |
48,0 |
6,0 |
(4800) |
||||||
| 20848 |
||||||||||
| 11848 |
||||||||||
| 21848 |
||||||||||
| 10832 |
0,7−3,9 incl. |
32,0 |
6,3 |
(5000) |
||||||
| 20832 |
||||||||||
| 11832 |
||||||||||
| 21832 |
||||||||||
Induction and maximum magnetic permeability are provided by the steel chemical composition and its manufacturing technology.
(Changed edition, Rev. N 1).
3.11. Temperature and environment of the annealing samples to obtain the magnetic properties are established by the manufacturer.
3.12. Aging steel grades 11832, 21832, 21848, 11860, 21860, 11880, 11848, 21880, 11895, 21895 not exceed 6 A/m.
(Changed edition, Rev. N 1).
3.13. On demand of the consumer sheet steel and tape manufactured with standardization:
extrusion depth of the spherical socket;
mechanical properties in the tensile test;
induction in various fields not listed in table.1.
Norms are established by agreement between manufacturer and consumer.
4. ACCEPTANCE RULES
4.1. Tape and sheet metal take parties. The party should consist of the product of one melting, one brand, one thickness and one mode of heat treatment and be accompanied by one document on quality in accordance with GOST 7566 with the addition of temperature and environment of the annealing samples for the determination of magnetic properties.
4.2. Control of thickness, size, surface condition and edges, bending test, extrusion, magnetic and mechanical properties is carried out on each roll; on two sheets from the party; 5% of rolls, but no less than five rolls.
Tapes, cut tapes and sheets obtained by cutting one roll to specified dimensions, such as one roll.
4.3. To determine the camber of strips selected two rolls from the party.
4.4. The presence of internal defects check all sheets of the party.
4.5. Induction and maximum magnetic permeability is determined according to the demand of the consumer.
4.6. To determine the chemical composition of one sample taken from the melt; single sheet, roll — the consumer.
4.7. If unsatisfactory test results of at least one of the indicators, repeat tests carried out according to GOST 7566.
5. TEST METHODS
5.1. To control the thickness, size, surface condition and edges, mechanical and magnetic properties and bend test from each coil to coils and cut tapes and sheets obtained by cutting one roll in the set sizes, select the same segment of length not less than 1500 mm.
5.2. The dimensions of the steel check of the measuring tool, providing the necessary measurement accuracy.
The thickness of the sheets selected from the coils of the segments is measured at four points located in the middle of each side cut or sheet at a distance of 40−60 mm from the edges.
The thickness of strips of a width of 15 mm or more measured at a distance of not less than 5 mm from the edges, of a width of less than 15 mm — in the middle of the width of the tape. The thickness of the edging tape measure at least 10 mm from the edge. The thickness of each measurement point shall not exceed the established norms.
The thickness of the hot rolled sheets is defined as the arithmetic average of the four measurements.
5.3. Camber strips is determined according to GOST 503.
5.4. Sampling to determine the chemical composition of the steel is carried out according to GOST 7565.
5.5. Chemical analysis carried out according to GOST 22536.0 to GOST 22536.1, 22536.4 GOST, GOST 22536.5 or other methods providing the required accuracy.
5.6. The surface condition and edge inspect without using the magnifying devices.
5.7. For testing bending, squeezing from each selected segment of the roll taken on two samples, from each selected list — one sample.
The bend test is carried out according to GOST 14019, squeezing — GOST 10510.
5.8. Control of internal defects is carried out by ultrasonic inspection (UT) in accordance with the requirements of GOST 12503.
5.9. The magnetic properties of steel are determined on the control and thermally treated samples.
Recommended maximum annealing temperature is 950 °C and the maximum cooling time to 600 °C — 10 h
5.10. For measuring the coercive force of the selected — cut sheets and rolls cut into strips, which are two samples according to GOST 12119.0 — GOST 12119.8.
Strip for fabrication of specimens cut across the direction of rolling, and strip width of 200 mm and less — in the direction of rolling.
To measure the maximum magnetic permeability and magnetic induction of the selected — cut, sheets rolls cut into strips, which are one sample according to GOST 12119.0 — GOST 12119.8 with the following additions.
Strip for the manufacture of a sample cut out 50% far and 50% across the direction of rolling.
5.11. The coercive force is determined in an open magnetic circuit according to GOST 12119.0 -GOST 12119.8.
(Changed edition, Rev. N 1).
5.12. The aging of the steel (increase the coercive force of the sample) is determined on the same sample taken for the determination of magnetic properties after heating the sample for 120 hours at a temperature of 120 °C.
5.13. For tensile tests are cut short samples having a width of 20 mm along the direction of rolling according to GOST 11701, of the selected cut — two samples, from each selected list — one sample. The tests are carried out according to GOST 11701.
(Changed edition, Rev. N 1).
6. MARKING, PACKAGING, TRANSPORTATION AND STORAGE
6.1. Marking, packaging, transportation and storage — by GOST 7566 with the following additions.
At the request of the consumer coils and strips should be covered with a thin layer of neutral grease that protects against corrosion.
Coils and bundles of sheets are Packed in wooden or metal containers according to normative-technical documentation.
Labeling also should contain: the stamp of the technical control Department and designation of the present standard. Marking is applied to both ends of a box or drawer.
(Changed edition, Rev. N 1).
6.1.1. Sheet steel and tape should be rolled up into rolls. The rolls must consist of products of one party.
The inner diameter of the coils should be:
(600±10,0) mm — for roll steel sheet and coil cut tape (350, 400, and 500±10,0) mm for rolls of tape.
By agreement between manufacturer and consumer a different inner diameter.
6.1.2. Sheet steel are Packed in bundles consisting of products of one party.
By agreement between manufacturer and customer can be packaged in one pack of several parties of the same size when splitting batches of strips.
6.1.3. Transport rental is carried out by all kinds of transport in accordance with cargo carriage regulations applicable to transport of this species.
Placement and fixation of rent on the open rolling stock — in accordance with the technical conditions of loading and fastening of cargoes, approved by the Ministry of Railways of the USSR.
6.1.4. Consolidation packages in accordance with the requirements of NTD, with dimensions according to GOST 21650.
6.1.3,
6.2. The weight of the stack of sheets should not be more than 5 tons; weight of a roll of sheet steel is not more than 6 tons; the minimum weight of a roll of tape set: tape width up to 80 mm inclusive — not less than 0.5 kg per 1 mm of width; for tape widths over 80 mm — not less than 40 kg.
At the request of the consumer the maximum weight should not exceed 100 kg for tape width of 50 mm or less.
By agreement with the consumer allowed bundles of sheets and coils larger mass.
6.3. Storage rental must be in covered warehouses or under a canopy to protect from rain.
(Changed edition, Rev. N 1).
