美和唐科技
金属复合新材料解决方案供应商
Supplier of metal composite new material solutions
覆铜钢片 H90黄铜钢复合铜带、复合双金属带材
一、产品说明
材质牌号：H90/F18/H90，H90/08Al/H90 ，以F18深冲钢（低碳冷轧钢带）为基材，双面H90黄铜冷轧压延复合轧制。
厚度规格：0.1-3.2mm 按需定制。
宽度：450-600mm，可分条，开平板
延伸率：32%以上
抗拉强度：300-400
状态：退火态交付。
二、铜复合材料产品应用（替代铜板带应用）领域。
A、工业材料：覆铜钢片 深冲，拉伸产品；
B、导热方面：铜火锅料，热餐具料，太阳能集热板、汽车水箱带各种散热片等；
C、装饰方面：豪华铜门窗铜装饰，铜标牌，焊接铜管及家用电器和装饰装潢等行业的基本材料；
D、导电方面：铜铝复合导电带、连接板、工业垫片、低压电器、导电排、变压器、电抗器，电子元器件，接插件，连接器，继电器，散热器等。
MATERIAL
Low Carbon Cold Rolled Steel Strip. Governing Spec.
EURonORMS EN10139/10140 Equal DIN 1624/1544,
DEscriptION
special extra deep drawing quality,Al-killed Brass Coated both side
brushed finished-dead soft temper slit edges-oiled-packed for export
Technical Specification
of
bimetallic strips 2,9-0,1 x 123-1 x 2000±5 mm
This standard applies to bimetallic strips produced by the method of simultaneous rolling process of a steel blank coated on both sides with a copper-zinc alloy. The coating thickness is from 4% to 6% of the steel blank thickness in its initial condition.
1. Assortment
Thickness of the bimetallic strip - 2,9-0,1 mm
Width of the bimetallic strip - 123-1 mm
Length of the bimetallic strip - 2000±5 mm
Strips with a length from 750 mm to 2000 mm have permissible deviations to 3% of the lot’s mass.
2. Parameters and properties
2.1 The bimetallic strips are manufactured in accordance with the requirements of this standard acc. to the technology regulation approved by respective manner.
2.2 The bimetallic strips are manufactured from steel, grade 18KP (18КП) with chemical composition according to GOST 1050-88 or from steel, grade 18YuA (18ЮА) with chemical composition according to GOST 803-81, with coating of copper-zink alloy, grade L90 (Л90) according to GOST 15527.
Chemical composition of steel, grade 18YuA (18ЮА) acc. to GOST 803
Steel Grade
Percentage of elements, %
Carbon
Manganese
Aluminum
Silicium
Sulfur
Phosphorus
not more
18YuA (18ЮA)
0,16-0,22
0,20-0,40
0,02-0,07
0,13
0,025
0,025
Note: Residual mass fraction of elements into steel 18YuA (18ЮА) should not exceed the following:
Chromium – 0,15%, Nickel – 0,25%, Copper- 0,20%. In grades 18KP (18КП) and 18YuA (18ЮА) and mass part of Chromium should not be more than 0,20% and for Carbon content not more than 0,18%.
Chemical composition of steel, grade 18KP (18КП) acc. to GOST 1050
Steel Grade
Percentage of elements, %
Carbon
Manganese
Chromium
Silicium
Sulfur
Phosphorus
not more
18KP (18КП)
0,12-0,20
0,30-0,50
0,15
0,06
0,035
0,030
Note: Residual mass fraction of elements into steel 18YuA (18ЮА) should not exceed the following:
Copper – 0,20%, Nickel – 0,30%.
Chemical composition of the copper-zinc alloy, grade L90 (Л90) acc. GOST 15527
Grade
Main elements - %
Impurities - %
L90 (Л90)
Copper
Zink
Lead
Iron
Antimony
Bismuth
Phosphorus
Impurities total
88-91
The rest
0,03
0,1
0,005
0,002
0,01
0,2
2.3. Strips are delivered in an annealed condition. The annealing is carried out in furnace in inert medium.
2.4. Mechanical properties of the bimetal should correspond to the values given in Table 1.
Table 1
Grade of the steel layer
Tensile strenght
MPa (kgf/mm2)
Elongation%
Not less than
18KP (18КП)
304-397 (31,00-40,50)
28,50
18YuA (18ЮА)
323-431 (33,00-44,00)
30,00
2.5. Deviation from the squareness (Out-of-squareness) of the cut where cutting is done at the ends of the strip shall not exceed 6 mm.
2.6. Edge camber (arcuated curvature of the side) of the strips should not be more than 4 mm, in length of 1000 mm.
2.7. Waviness (arcuated deviation from the flatness along the length) of the strips should not be more than 20 mm, permissible number of waves –not more than 2 per strip.
2.8. Strips’ surface should be free of contamination and mechanical damages. A slight oxidation on the surface, which does not interfere with the detection of surface defects, is allowed after agreement between the manufacturer and the user.
2.9. In the strips is not allowed: stratification the steel layer, delamination of the cladding layer, face cracks, baring of the steel layer at a distance greater than 1,5 mm from the end of the strip.
2.10. Upon a technological trial (bending of a cup) the quantity of cups with delamination of the cladding layer and fracture of the metal should not be greater than 1%, including on the steel layer:
- for steel grade 18KP (18КП) – 0,4%
- for steel grade 18YuA (18ЮА) – 0,3%
2.11. Тhe contamination of the steel layer of the strips with non-metallic inclusions should not exceed:
- for steel grade 18KP (18КП) – acc. to GOST 1778 to grade 4 on a scale agreed between the manufacturer and the user;
- for steel grade 18YuA (18ЮА) (filamentary oxides, sulfides) – acc. to GOST 1778 – filamentary oxides (OC) - scale (OC) to grade 3 and sulfides (C) – scale (C) to grade 3 . For the filamentary oxides and sulfides is allowed grade 4 in one of three testing samples.
2.12. Microstructure of the steel layer of the strips should comply with the following requirements:
- metal banding (metal banding is a distribution of ferrite and pearlite grains in the form of strips) – acc. to English version of GOST 5640, permissible grade 0, 1, 2 on scale 3, line B
- Size of the ferrite grains – acc. GOST 5639; permissible grade 7, 8, 9 on scale I.
Upon using of the additional scale I, grade 10 is permissible. Grains with elongated shape are permissible.
- The shape of the pearlite – on scale 2 acc. to English version of GOST 5640, Permissible grades: line A to grade 5A inclusive and line B – to grade 4B inclusive.
2.13. Local protrusions and dents of the strips should not exceed 2 mm.
3. Packing and marking.
3.1. Packaging requirements:
3.1.1. The packaged bimetallic strips should be wrapped all sides with inhibitor paper and stretch foil in six layers and height till reaching a mass up to 2,5-3 tons, and protective corners put in advance on the four vertical edges.
3.1.2. The strips should be delivered in a closed package (covered with a metal lid), protecting it from ingress of moisture and to be able to retain its integrity during transportation and handling operations and preventing the strips from damage.
3.1.3. The package with strips stacked in the base of case is fastened at least in 3 points with packaging metal straps to prevent it from falling out during handling activities.
3.1.4. After the lid has been placed, the package is placed on a wooden pallet and additionally strapped with metal bands together with the pallet on two points along the length and minimum on three points along the width.
3.2. Package marking requirements:
3.2.1. The marking should be applied on the self-adhesive sticker on the cover of the wooden or the metal case, on this side where the marking will be visible when the cases are stacked one over another. Inside the wooden or the metal case there should have sticker.
3.2.2. The marking should indicate the following:
- Name or trademark of the manufacturing plant;
- Steel grade
- Melt number in the Quality document;
- Batch/lot number;
- Thickness and width of the strip;
- Serial number of the cases from same batch/lot;
- Quality certificate.
3.2.3. It is permissible the marking according paragraph 3.2.1. - 3.2.2. to be a laminated label placed on and in the package.
4. Acceptance.
4.1 The strips are accepted in batches/lots. The batches/lots should consist from strips with same thickness and width, made from same steel melt and same annealing. The batches/lots are accompanied by quality document containing the following:
- Freight sign or name and freight sign of the manufacturer (Name or trade mark of the manufacturer&＃39;s plant
- User name;
- Number of the batch/lot, number the melt, number of the annealing;
- Mass and dimensions of the strips;
- Results from the tests conducted;
- Remark in case of a repeated batch/lot annealing;
- The batch/lot mass is determined by the capacity of the furnace.
4.2. Strips’ surface and dimensions are subjected to Quality control in *** during the production process at the manufacturer facilities and 5% of the strips from the batch/lot during the acceptance control at the premises of the manufacturer and the user.
4.3. To carry out the strips quality acceptance the manufacturer takes samples for:
- analysis of the chemical composition - two blanks of melt;
- mechanical testing – six strips in total, i.e two samples taken from the top, middle and bottom part of each chamber after annealing.
- checking the degree of contamination by non-metallic inclusions – three strips in total, i.e one taken from the top, middle and bottom part of each chamber after annealing.
- checking the microstructure - a total of three strips, i.e one taken from the top, middle and bottom part of each chamber after annealing.
- conducting of technological testing - a total of three strips, i.e one taken from the top, middle and bottom part of each chamber after annealing.
4.4. For strips quality inspection the user takes the following samples for:
- analysis of the chemical composition – one strip from each batch/lot
- conducting the mechanical testing, checking the microstructure and the degree of contamination by non-metallic inclusions – one strip from each ton.
- technological testing – one strip with length not less than 1000 mm from each ton.
In case of satisfactory results from tests of the chemical composition, mechanical properties and microstructure of strips, it is permissible not to carry out the technological testing.
4.5. In case of unsatisfactory results from a given test, a re-testing of a doubled quantity of samples taken from different strips but from same annealing.
The results from the re-testing are final and refer to the entire batch/lot.
4.6. The strips not complying with the mechanical properties and microstructure can be repaired by re-annealing, but not more than once.
5. Test methods.
5.1. From each sample-strip should be taken samplings:
- for analysis of the chemical composition- one sampling;
- for mechanical tests - one specimen in acc. with the requirements of GOST 1497 or GOST 11701;
- for checking of the microstructure and degree of contamination – one sample with dimensions 30x40mm, with thickness of the sample equal to the thickness of the strip.
The side of the specimen with a length of 30 mm should be positioned longitudinally in the direction of the rolling.
5.2. The chemical composition of the steel is determined by the Atomic emission spectral analysis and Atomic Absorption Analysis methods.
5.3. Upon conducting of control chemical analysis of the steel layer of the bimetallic strips, the copper zinc alloy coating is removed beforehand.
5.4. The tensile test is conducted according GOST 1497.
5.5. The dimensions of the strips are checked with measuring instruments and control templates.
The thickness of the strip shall be measured with a micrometer with an accuracy of not more than 0,01 mm at three points along its length and at two points in its width at a distance of not less than 5 mm from the ends of the strip.
5.6. The absence of surface defects and the presence of unacceptable defects are checked visually by comparing the surface with control/reference specimen. (Consider the requirements of paragraphs 2.8 and 2.9 of the Technical Specification of Bimetallic strip 2,9 x 123 x 2000 mm.
5.7. A trial by performing a technological test is conducted along the entire length and width of the strip by compressing/folding a cup on a Press. The tool drawings necessary for conducting the technological test should be coordinated between the manufacturer and the user.
5.8. Non-metallic inclusions are determined on non-pickled, polished metallographic sample at а magnification of 100 times.
evaluation of the non-metallic inclusions is carried out by comparing the maximum contaminated point on the surface of the metallographic sample;
- for samples of steel 18КП-on a scale agreed between the manufacturer and the user
- for samples of steel 18YuA (18ЮА) - on a scale – GOST 1778 method Sh2 (Ш2).
Methodology Sh2 (Ш2) indicates that the sample has to be observed at a magnification of 90 to 110 x. The most contaminated place on the metallographic sample is observed.
5.9. The microstructure of the steel layer of the strips is determined by:
- the metal banding – acc. to English version of GOST 5640, scale 3, line B at magnification 100. (metal banding is a distribution of ferrite and pearlite grains in the form of strips).
- the size of the ferrite grain - acc. GOST 5639, at magnification 100. When necessary a control of the ferrite grain at a magnification 400 on the additional scale I GOST 5639 for determination of the small grain is permitted.
- the shape of the perlite - acc. to English version of GOST 5640, scale 2, at a magnification of 400.
5.10. Control of the edge camber and squareness (perpendicularity) of the cut - acc.to Fig.2 and Fig.3 indicated in the Appendix.
6. Transportation and storage.
6.1. Transportation and storage – acc. to the packaging and marking requirements indicated in the Appendix to the current specification.
7. Description of the enclosed scale for evaluation of the perlite in the steel layer.
The six-grade scale consists of two lines.
- Line A - Increasing the size of the cementite globules starting form point- and small grained to big globules turning into plastic perlite in some sections.
- Line B - Increasing the amount of sorbitol perlite (in percent ratio) in the filamentous distribution of structural components.
The six-grade scale should correspond to the description given in the table.
The evaluation of the microstructure shall be carried out by indicating the relevant grade and index.
Grade
Line A
Line B
1
Characterized by point and minor amounts of fine grain cementite
Is characterized by point and minor amounts of fine grain cementite with filamentous distribution
2
Characterized by fine grain and minor amounts spot cementite
Characterized by structure of grained perlite with filamentous distribution.
3
Characterized by structure of grained cementite.
Characterized by structure of grained cementite and sorbitol-shaped perlite (to 20%) with filamentous distribution.
4
Characterized by structure of medium – grained cementite with inclusions of coarse grains of cementite with elongated shape up to 15%.
Characterized by structure of sorbitol-shaped perlite (50%) and grained cementite (50%) with a filamentous distribution.
5
Characterized by coarse –grained cementite with globular and elongated shape.
Characterized by structure of sorbitol-shaped perlite (80%) and grained cementite with a filamentous distribution.
6
Characterized by coarse-grained cementite with globular and elongated shape with sections of plastic perlite.
Characterized by a coarse accumulation of sorbitol-like perlite with insignificant amounts of a thin-walled perlite with a filamentous distribution.
Note: The uneven distribution of globular cementite in the absence of sorbitol-shaped cementite not foreseen by line A of the given scale is not considered a as a reject (scrap) factor. In this case the evaluation of the microstructure is done on base of the size of the globules of cementite from line A.
Requirement for control of edge camber and squareness (perpendicularity) of the cut of the strips
Edge camber (arcuated curvature of the side) at the edges of the strips should be no more than 2 mm in length of 1 meter
Squareness of the strips’ cut
- The ends of the strips must be cut at right angles. The curve of the cut should not exceed 6 mm