PDF Q/BQB 485-2023 English (Q/BQB 485-2021: Older version)
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Q/BQB 485-2023: PDF in English (QBQB 485-2023) Q/BQB 485-2023
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON & STEEL CO., LTD.
Replacing Q/BQB 485-2021
Cold-rolled grain-oriented electrical steel strip delivered in
the fully processed state
ISSUED ON. APRIL 09, 2023
IMPLEMENTED ON. JULY 01, 2023
Issued by. Baoshan Iron & Steel Co., Ltd.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Classification... 6
5 Symbols and designations... 7
6 General requirements... 9
7 Technical requirements... 11
8 Inspection and test... 19
9 Judgment and re-inspection rules... 23
10 Packaging, marking, inspection documents... 23
11 Rules for numerical rounding... 24
12 Other instructions... 24
13 Information required for ordering... 24
Appendix A (Normative) Method for cutting specimens for test of adhesion of
insulating coating and large single sheet magnetic properties of grain-oriented electrical
steel... 25
Appendix B (Informative) Comparison of grain-oriented electrical steel designations
similar to this document and other domestic and foreign technical specifications... 27
Appendix C (Informative) Technical differences between this document and the
national standard GB/T 2521.2-2016... 29
Appendix D (Informative) Typical values of technical performance indicators of
representative designations of grain-oriented electrical steel in this document... 32
Cold-rolled grain-oriented electrical steel strip delivered in
the fully processed state
1 Scope
This document specifies the definition, classification and code, size, shape, weight,
magnetic properties, inspection and testing, packaging, marking and quality certificate
requirements of cold-rolled grain-oriented electrical steel strip delivered in the fully
processed state, which has a nominal thickness of 0.18 mm, 0.20 mm, 0.23 mm, 0.27
mm, 0.30 mm, 0.35 mm.
This document applies to cold-rolled grain-oriented electrical steel strip delivered in the
fully processed state (hereinafter referred to as product), which is delivered in the final
annealing state produced by Baoshan Iron & Steel Co., Ltd.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 228.1-2021 Metallic materials - Tensile testing - Part 1.Method of test at room
temperature
GB/T 247 General rule of package, mark and certification for steel plates (sheets)
and strips
GB/T 2521.2 Cold-rolled electrical steel delivered in the fully-processed state - Part
2.Grain-oriented steel strip (sheet)
GB/T 2522 Methods of test for the determination of coating insulation resistance
and coating adhesion of electrical strip and sheet
GB/T 2900.60 Electrotechnical terminology - Electromagnetism
GB/T 3655 Methods of measurement of the magnetic properties of electrical steel
strip and sheet by means of an Epstein frame
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1.Test method
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 9637 Electrotechnical terminology - Magnetic materials and components
GB/T 13789 Methods of measurement of the magnetic properties of electrical steel
strip and sheet by means of a single sheet tester
GB/T 17505 Steel and steel products - General technical delivery requirements
GB/T 18253 Steel and steel products - Types of inspection documents
GB/T 19289 Methods of measurement of resistivity, density and stacking factor of
electrical steel strip and sheet
YB/T 4292 Methods of determination of the geometrical characteristics of electric
steel sheet and strip
YB/T 4731 Reverse bend test method for electrical steel strip and sheet
Q/BQB 400 Package, mark and inspection document for cold-rolled product
IEC 60404-8-7 Specifications for individual materials - Cold-rolled grain-oriented
Magnetic materials electrical steel strip and sheet delivered in the fully-processed
state
IEC/TR 62581-2010 Methods of measurement of the magnetostriction
characteristics by means of single sheet and Epstein test specimens
3 Terms and definitions
The terms and definitions as defined in GB/T 2521.2, GB/T 2900.60, GB/T 9637, YB/T
4292, as well as the following terms, apply to this document.
3.1 Specific total loss (iron loss)
Specific total loss refers to the total power absorbed by a unit mass of material when
the magnetic polarization intensity changes sinusoidally and its peak value and
frequency are specific values. The specific total loss is represented by the symbol P
(Jm/f), in W/kg (or W/lb).
Example. P1.7/50 represents the specific total loss per unit kg (or lb) of specimen,
which is measured at a magnetic polarization intensity of 1.7T and a frequency of
50Hz;
P1.7/60 represents the specific total loss per unit kg (or lb) of specimen, which is
measured at a magnetic polarization intensity of 1.7T and a frequency of 60Hz.
3.2 Magnetic polarization (magnetic induction)
Magnetic polarization refers to the peak value of the specific magnetic field intensity
when the specimen is magnetized by an alternating magnetic field. Its symbol is J
(H) and its unit is T (Tesla).
Example. J800 represents the magnetic polarization corresponding to a magnetic field
intensity H of 800A/m (expressed as peak value).
3.3 Specific apparent power
For the set magnetic polarization and frequency values, the total power consumed
by the magnetized unit mass of the iron core is the specific apparent power, with its
symbol SS and its unit VA/kg.
Example. SS1.7/50 represents the specific apparent power per kg of the specimen,
which is measured at a magnetic polarization intensity of 1.7T and a frequency of
50Hz.
3.4 A-weighted magnetostriction velocity level, LVA
When the magnetic polarization changes sinusoidally with time, its peak value is a
certain calibration value, the frequency of change is a certain calibration frequency,
the surface vibration sound pressure level caused by magnetostriction per unit length
of electrical steel sheet (strip) along the magnetization direction is the A-weighted
magnetostriction velocity level.
3.5 Surface insulation resistance
The DC resistance measured under specified conditions, that is, the resistance
corresponding to the leakage current flowing through the surface of the strip (sheet)
after the product is polarized for a certain period of time after the DC voltage is
applied, which has a symbol C and a unit of Ω·mm2/surface or Ω·cm2/surface.
3.6 Inter-lamination resistance
The insulation resistance between the product laminations, that is, the upper and
lower surfaces, is called inter-lamination resistance, with the symbol RA,
theoretically which is twice the surface insulation resistance, in Ω·mm2/sheet or
Ω·cm2/sheet.
4 Classification
The designations of the materials in this document is classified according to the nominal
value of the maximum specific total loss P1.7/50 (W/kg) at a magnetic polarization of
1.7T and a frequency of 50Hz, as well as the nominal thickness of the material.
under its own weight.
6.2.5 The steel coil usually does not have a weld. If the product has a joint or weld due
to the removal of defects, the joint or weld shall be marked. The front and rear parts of
the joint or weld shall be of the same designation and not more than 2 places. The length
of the steel strip between the welds shall not be less than 200 meters; it shall be indicated
in the contract after negotiation between the supplier and the buyer.
6.2.6 Except for the uncoated series products, the products are coated with insulating
coating on both sides.
6.2.7 When the user has special requirements, it shall comply with the order agreement.
6.3 Delivery status
The products are delivered in the final annealed state. The coated products are coated
with insulating coating on both sides. The uncoated series products have no base layer
and insulating coating on the surface. The type of insulating coating is determined by
the supplier according to its own production process; it can also be determined by
negotiation between the supplier and the buyer.
6.4 Surface conditions
6.4.1 The surface of the product shall be smooth and clean, free of grease, rust stains,
or defects that affect use.
6.4.2 The surface of the product is allowed to have substrate defects, base layer defects,
insulating coating defects that do not affect the normal use of the material, such as slight
scratches, roller marks, color differences, crystal exposure, color spots, small white
spots, small bubbles, cracks and other defects.
6.4.3 The insulating coating on the surface of the product shall adhere well and the
coating shall be uniform, to ensure that it does not fall off during reasonable shearing
operations and annealing under the stress relief annealing conditions recommended by
the manufacturer.
6.4.4 When the product is delivered with welds or defects, blank paper must be inserted.
If necessary, the marking form of the relevant blank paper shall be negotiated by the
supplier and the buyer and indicated in the contract.
Note. If the product is used immersed in liquid as specified in the agreement, the compatibility
between the liquid and the coating must be ensured.
6.5 Shear adaptability
The product shall be easy to accurately cut into a common shape, at any position with
appropriate shearing tools.
7 Technical requirements
7.1 Magnetic properties
7.1.1 The properties of cold-rolled grain-oriented electrical steel provided under the
conditions of 6.3 shall comply with the provisions of Tables 3, 4, 5, 6, 7, 8, 9; the aged
specimens shall also meet these properties. For products with coatings, the mass of the
insulating coating shall be calculated.
7.1.2 The magnetic properties of the conventional magnetostriction type, high
permeability type, heatproof scribed domain-refined products in Tables 3, 4, 6 shall be
tested in accordance with GB/T 3655.Before testing, the specimens shall be subjected
to stress relief annealing, under the conditions provided by the manufacturer (usually
the stress relief annealing temperature range is 800 °C ± 20 °C, the annealing time is
2h, it is cooled together with the furnace after annealing). However, the magnetic
properties of the products produced by the non-heatproof domain-refined method (such
as laser scratching) in Table 5 shall be tested in accordance with GB/T 13789; the
specimens do not need to be subjected to stress relief annealing before testing. After
negotiation between the supplier and the buyer, the magnetic properties of the products
in Tables 3, 4, 6 can also be tested in accordance with GB/T 13789.
7.1.3 The magnetic property detection methods of each series of products in Tables 7,
8, 9 shall be carried out according to the provisions of Article 7.1.2 of this document
according to the product type.
7.1.4 The magnetic polarization intensity J800 measured under the condition of magnetic
field intensity H = 800 A/m shall comply with the provisions of Table 3, Table 4, Table
5, Table 6, Table 7, Table 8, Table 9.The magnetic polarization intensity value J800 of
the same product, which is measured by the GB/T 13789 method, is lower than the
magnetic polarization intensity value, which is measured by the GB/T 3655 method.
7.1.5 For domain-refined products with a thickness of no more than 0.20 mm, under the
conditions of magnetic polarization intensity of 1.7T and frequency of 50Hz or 60Hz,
the specific total loss values under 50Hz and 60Hz conditions, as measured by the GB/T
13789-2022 method, shall be converted with reference to the conversion coefficient FC
= 0.925 specified in IEC 6040-8-7 Edition 5.0 2020-09.The converted P1.7/50 and P1.7/60
shall comply with the provisions of Table 5, Table 7, Table 9.The conversion coefficient
FC of P1.5/50 and P1.5/60 under the same conditions shall be determined based on the
results of actual detection and application comparison experiments.
7.1.6 For domain-refined products with a thickness of not less than 0.23 mm, the
specific total loss values at 50 Hz and 60 Hz, as measured by the GB/T 13789-2022
method, shall be converted to the square circle method data, with reference to the
relationship D.1 specified in Appendix D of GB/T 13789-2022.The converted P1.7/50,
P1.7/60, P1.5/50, P1.5/60 shall comply with the provisions of Table 5, Table 7, Table 9.
7.2 Coating characteristics
According to the requirements of the buyer, after negotiation between the supplier and
the buyer, the coating characteristics test can be carried out; the coating characteristics
guarantee value shall be indicated in the contract. If the product needs to be heat treated,
it shall be carried out according to the conditions specified by the manufacturer,
meanwhile it shall be indicated in the contract that the coating characteristics shall be
tested before or after the heat treatment.
The insulating coating shall be able to withstand the erosion of insulating paint,
transformer oil, mechanical oil and other media.
7.2.1 Coating adhesion
The coating adhesion level of products with a thickness of < = 0.23 mm shall be D or
above; the coating adhesion level of products with a thickness of > 0.23 mm shall be E
or above.
During the shearing process and heat treatment under the heat treatment conditions
specified by the supplier, the coating shall not fall off in a large area, but slight cracking
of the coating is allowed on the shearing edge.
7.2.2 Coating insulation resistance
The detection of coating insulation resistance shall refer to GB/T 2522, or the two
parties may negotiate and detect according to the agreed method. The relevant technical
requirements shall be stated in the contract.
According to GB/T 2522, the surface insulation coating resistance measured by single-
sided 5 measurements shall have an average value of not less than 30 Ω·cm²/side; the
single minimum value of single-sided 5 measurements shall not be less than
5Ω·cm²/side. If the supplier can guarantee, this test may not be carried out.
7.3 Geometric properties and tolerances
7.3.1 Thickness
The nominal thickness of the product is 0.18 mm, 0.20 mm, 0.23 mm, 0.27 mm, 0.30
mm, 0.35 mm. The thickness tolerance includes the following three categories,
including.
- The tolerance of the nominal thickness within the same acceptance batch, referred
to as the nominal thickness tolerance;
- The deviation between the actual thickness of each point in the longitudinal
direction of the product within a certain length (2000 mm ± 200 mm) parallel to
the rolling direction (i.e., the length direction of the product), hereinafter referred
According to the requirements of the purchaser and indicated in the contract, the
residual curvature of products with a width of not less than 150 mm can be tested. The
distance between the bottom edge of the test steel sheet and the support plate shall not
exceed 10 mm. If the supplier can guarantee it, this test can be omitted.
7.3.6 Burr height
The shear burr height of the trimmed product shall not exceed 0.020 mm.
7.4 Technical characteristics
7.4.1 Density
The agreed density used to calculate the magnetic properties and stacking factor is 7.65
× 103 kg/m3.
7.4.2 Stacking factor
The minimum stacking factor of the product shall comply with the provisions of Table
3, Table 4, Table 5, Table 6, Table 7, Table 8, Table 9.
7.4.3 Number of bending
The minimum number of bending of the product parallel to the rolling direction shall
not be less than 1.If the supplier can guarantee this, this test may not be performed.
7.4.4 Deviation of shear edge caused by internal stress
The product shall avoid internal stress as much as possible. According to the
requirements of the purchaser and indicated in the contract, the shear edge deviation
caused by internal stress can be tested for materials with a width of not less than 500
mm (materials after longitudinal slitting); the gap measurement value shall not exceed
1 mm. If the supplier can guarantee this, this test may not be performed.
8 Inspection and test
8.1 General requirements
8.1.1 When signing an order agreement according to this document, the user may
perform specified inspections and tests or non-specified inspections and tests in
accordance with GB/T 17505.However, for non-specified inspections and tests, the
manufacturer shall provide the required specific total loss value and magnetic
polarization intensity value of the product.
8.1.2 When placing an order for inspection and testing as specified, the user shall
specify the type of inspection document in GB/T 18253.
8.1.3 Coils shall be batched by coils; generally one coil shall constitute one acceptance
batch.
8.1.4 Unless otherwise agreed, the provisions of 8.1.3 apply to the inspection of shear
edge deviation caused by internal stress, coating insulation resistance, geometric
characteristics, tolerance.
8.1.5 When the product is supplied in the form of sub-coils, the test results on the
original acceptance batch shall apply to the sub-coil.
8.2 Sampling
8.2.1 Samples shall be cut from each acceptance batch.
8.2.2 The innermost and outermost rings of the product shall be regarded as packaging
materials and do not represent the quality of the entire steel coil. Specimens shall not
be cut from this part. Specimens shall avoid welds and joint areas.
8.2.3 The sampling position shall be not less than 3 m from both ends of the product
and not less than 15 mm from the edge of the product. For test items with special
sampling requirements such as large single-sheet magnetic properties and insulation
coating adhesion, sampling shall be carried out in accordance with the provisions of
Appendix A.
8.2.4 By arranging the test sequence reasonably, the same set of specimens can be used
to test multiple characteristics.
8.3 Surface appearance inspection
The surface appearance quality of the product is inspected by naked eyes.
8.4 Measurement of size and shape
8.4.1 Size and shape
It shall be measured with appropriate measuring tools. The measurement position shall
be no less than 3 m from the head and tail ends of the product.
8.4.2 Thickness measurement
The thickness of the trimmed steel strip shall be measured at any position not less than
15 mm from the edge. The micrometer used for measurement shall have an accuracy of
0.001 mm.
8.4.3 Measurement of unevenness (wavyness)
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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