GB/T 19345.1-2017Amorphous and nanocrystalline alloys—Part 1: Fe-based amorphous soft magnetic alloy strips (English PDF)

3.1 Specific total loss

the total power absorbed by the homogeneous magnetized material per unit mass, in watts per kilogram (W/kg)

3.2 Specific apparent power

the apparent power

the total apparent power delivered to a unit mass of uniform magnetized material, in volt-amperes per kilogram (VA/kg)

3.3 Lamination factor

the ratio of the cross-sectional area of the magnetic material to the total cross-sectional area of the stack

5.1 Production process

The production process and chemical composition of the strips are decided by the supplier.

5.2 Delivery form

5.2.5 The strips shall be wound tightly, no local relaxation, no wrinkles, no collapse, no falling off during handling due to self-weight, no lateral offset during unwinding.

5.2.6 The strips may be spliced by removing defects. The front and back parts of splicing shall be of same designation, same nominal width. The part of splicing shall be marked.

5.2.7 The particular requirements for strip delivery form shall be determined by the supplier and the purchaser.

5.3 Delivery conditions

The strips are normally delivered in non-sheared semi-processed state (prepared state) with the absence of a top coat. The particular requirements for strip delivery form shall be determined by the supplier and the purchaser.

5.4 Surface quality

5.4.1 The surface of the strips shall not have rusts, greases, fingerprints, foreign materials or the continuous visible oxidation.

5.5 Shear adaptability

When using suitable equipment for cutting, any part of the strips shall be able to be cut into the usual shape.

6.1 Physical properties

6.1.1 The strips delivered in the semi-processed state (prepared state) shall be heat-treated properly to obtain the desired magnetic properties.

6.1.2 The magnetic properties of the strips shall comply with the provisions of Table 1, Table 2, Table 3, respectively. The heat treatment process is provided by the supplier and indicated in the quality certificate. Any particular requirements for magnetic properties may be determined by the supplier and the purchaser.

6.1.3 See Table A.1 for other basic physical parameters of the strips.

6.2 Geometric characteristics

6.2.1 Thickness and allowable deviation

6.2.1.1 The nominal thicknesses of the strips are 0.020 mm, 0.025 mm, 0.030 mm.

6.2.2 Width and allowable deviation

6.2.2.1 The width scope of the strips is 10mm ~ 300mm. The specific size shall be determined in the contract.

6.3 Technical characteristics

6.3.1 Density

The density used for the calculations of strip magnetic properties and lamination factor is supplied by the supplier.

6.3.2 Lamination factor

The strip lamination factor shall comply with Table 1.

7.1 General requirements

7.1.1 The strips shall be submitted for inspection and measurement. Each casting furnace is an acceptance batch.

7.1.2 When the strips are supplied in divided coils. The measurement results on the original acceptance batch apply to this divided coil.

7.2 Sampling

7.2.1 It shall extract a sample respectively on the head, the end of each batch of the strips. When more than one coil is continuously produced in a casting furnace, a sample shall be taken at the end of each coil. The particular requirements shall be determined by the supplier and the purchaser.

7.3 Sample preparation

7.3.1 Physical properties

7.3.1.1 Measurements of DC magnetic properties and AC magnetic properties by toroidal sample

7.3.2 Geometric characteristics

7.3.2.1 The sample preparation used to measure thickness shall comply with the requirements of C.1.1.

7.3.2.2 The sample used for width measurement is usually a strip of a length of 200 mm.

7.3.3 Technical characteristics

7.4 Measurement method

7.4.1 Physical properties

7.4.1.1 The measurement method of using a toroidal sample to measure DC magnetic properties shall be in accordance with GB/T 13012.

7.4.3 Technical characteristics

7.4.3.1 For the strip used to product the distribution transformer iron core, the measurement method of its lamination factor shall be in accordance with C.2.1.

7.5 Re-inspection and determination rules

If an inspection item fails, it shall allow to take samples double the number for the re-inspection. Should an item fail in the re-inspection results, then this batch of strips shall be unqualified.

8.1 Packaging

The strip coil shall use moisture-proof packaging to ensure that the strips do not have quality degradation due to corrosion within 6 months under unopened conditions.

8.2 Storage

The packaged strips shall be stored in a dry and ventilated environment. Avoid storage in humid or corrosive atmospheres. The reel of strip coil shall be placed perpendicular to the horizontal plane.

8.3 Marks

The reel and packaging box of strip coil shall have firm mark that meets the traceability requirements.

8.4 Quality certificate

Each batch of strips delivered shall be attached with quality certificate that proves that this batch of strips comply with the provisions of this Part and order contract. The quality certificate shall contain the following information.