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This standard is developed in accordance with the rules given in GB/T 1.1-2009
This standard replaces GB/T 26007-2010 Copper Strips for Springs and Connectors.
The following technical changes have been made with respect to GB/T 26007-2010 (the previous edition):
——The state representations of "quarter hard (Y4), half hard (Y2), hard (Y), ultrahard (T) and elastically hard (TY)" are changed into "quarter hard (H01), half hard (H02), hard (H04), ultrahard (H06) and elastic (H08)";
——The thickness range is expanded from "0.1mm ~ 1.5mm" into "0.07mm ~ 2mm";
——The width range is expanded from "3mm ~ 200mm" into "6mm ~ 620mm";
——The code designation of alloy is added;
——The designations of H62, H66 and H68 and relevant requirements are added;
——The provision of "the chemical composition analysis of strips is carried out according to YS/T 482 and YS/T 483" is added;
——The provision of "inspection on overall dimension of strip shall be carried out according to GB/T 26303.3" is added;
——The provision of "sample preparation shall be carried out according to YS/T 815" is added;
——The provision of "sampling method shall conform to YS/T 668" is added;
——The requirements of "strip side camber" are raised;
——The requirements of "permissible width deviation of strips" are raised;
——The requirements of "permissible deviation of strip thickness" are raised.
This standard was proposed by China Nonferrous Metals Industry Association.
This standard is under the jurisdiction of National Technical Committee on Nonferrous Metals of Standardization Administration of China (SAC/TC 243).
The previous edition replaced by this standard is as follows:
——GB/T 26007-2010.
Copper Alloys Strip and Foil for Springs and Connectors
1 Scope
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transport and storage, quality certificate as well as order (or contract) contents of copper alloys strip and foil for springs and connectors.
This standard is applicable to the manufacture of copper alloys strip and foil for springs and connectors (hereinafter referred to as "strip and foil").
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 228.1-2010 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature
GB/T 232 Metallic Materials - Bend Test
GB/T 4340.1 Metallic Materials - Vickers Hardness Test - Part 1: Test Method
GB/T 5121 (all parts) Methods for Chemical Analysis of Copper and Copper Alloys
GB/T 5231 Designation and Chemical Composition of Wrought Copper and Copper Alloys
GB/T 8888 Wrought Heavy Non-ferrous Metal Products - Packing, Marking, Transportation, Storing and Certificate of Quality
GB/T 1186 Copper and Copper Alloys－Terms and Definitions
GB/T 26303.3 Measuring Methods for Dimensions and Shapes of Wrought Copper and Copper Alloys - Part 3: Sheets and Strips
YS/T482 Methods for Analysis of Copper and Copper Alloys - The Atomic Emission Spectrometry
YS/T483 Methods for Analysis of Copper and Copper Alloys - X-Ray Fluorescence Spectrometric (Wavelength Dispersive)
YS/T668 The Sampling Method of Physical and Chemical Testing for Copper and Copper Alloys
YS/T815 Preparation Method of Test Pieces for Mechanical and Technological Properties of Copper and Copper Alloys
3 Requirements
3.1 Product classification
3.1.1 Designation, state and specification
The designation, state and specification of strip and foil shall meet those specified in Table 1.
Table 1 Designation, State and Specification
Designation Code State Thickness
mm Width
mm
H35 C23000 Quarter hard (H01), half hard (H02), hard (H04) and ultrahard (H06) 0.07~2.0 6~620
H80 C24000
H70 T26100
H68 T26300
H66 C26800
H65 C27000
H63 T27300
H62 T27600
QSn4-0.3 C51100 Quarter hard (H01), half hard (H02), hard (H04) and ultrahard (H06) 0.07~2.0 6~620
QSn5-0.3 T51010
QSn6.5-0.1 T51510
QSn8-0.3 C52100 Quarter hard (H01), half hard (H02), hard (H04), ultrahard (H06) and elastic (H08)
BZn12-24 T76200 Half hard (H02), hard (H04) and ultrahard (H06) 0.07~2.0 6~620
BZn12-29 T76220
BZn18-18 C75200
BZn18-20 T76300
BZn18-26 C77000
Notes:
1. Strips and foils in other designation, state and specification may also be supplied through negotiation between the supplier and the purchaser.
2. According to those specified in GB/T 11086, strip thickness > 0.15mm and foil thickness . Accomm.
3.1.2 Marking example
The product marking shall be expressed in the sequence of the product name, standard number, designation (or code), state and specification.
Example 1: the mark of strip manufactured with H65 (code: C27000) in hard (H04) state, with thickness of 0.8mm and width of 200mm is:
Strip GB/T 26007-H65 H04-0.8×200
Or Strip GB/T 26007-C27000 H04-0.8×200
Example 2: the mark of foil manufactured with H65 (code: C27000) in hard (H04) state, with thickness of 0.8mm and width of 200mm is:
Foil GB/T 26007-H65 H04-0.08×200
Or Foil GB/T 26007-C27000H 04-0.08×200
3.2 Chemical composition
The chemical composition of the strip and foil shall meet the requirements of GB/T 5231 for corresponding designation.
3.3 Overall dimension and permissible deviation
3.3.1 Thickness and permissible deviation of strips and foils shall meet the corresponding requirements specified in Table 2.
Table 2 Thickness and Permissible Deviation In: mm
Thickness Permissible thickness deviation
Common level Advanced level
0.07~0.1 ±0.005 ±0.003
>0.1~0.2 ±0.010 ±0.005
>0.2~0.3 ±0.015 ±0.008
>0.3~0.4 ±0.018 ±0.010
>0.4~0.5 ±0.020 ±0.015
>0.5~0.8 ±0.025 ±0.018
>0.8~1.0 ±0.030 ±0.022
>1.0~1.5 ±0.035 ±0.025
>1.5~2.0 ±0.045 ±0.035
Note: If the purchaser requires the permissible length deviation to be"+" or "-" unilateral deviation, the value is two times of that in the table.
3.3.2 The width and permissible deviation of strip and foil shall meet the corresponding requirements specified in Table 3.
Table 3 Width and Permissible Deviation In: mm
Thickness Permissible width deviation
6~80 >80~200 >200~620
0.07~0.6 ±0.05 ±0.08 ±0.15
>0.6~1.0 ±0.10 ±0.15 ±0.20
>1.0~1.5 ±0.15 ±0.20 ±0.25
>1.5~2.0 ±0.20 ±0.25 ±0.30
Note: If the purchaser requires the permissible length deviation to be"+" or "-" unilateral deviation, the value is two times of that in the table.
3.3.3 The side camber of strip and foil shall meet those specified in Table 4.
Table 4 Side Camber
Width/mm Side camber/(mm/m)
Thickness≤0.5 Thickness>0.5
6~10 ≤4 ≤5
>10~20 ≤3 ≤4
>20~200 ≤2 ≤3
>200~620 ≤1 ≤2
3.3.4 Transversal bending of strip and foil: for strip and foil with the width less than or equal to 100mm, the transversal bending d (see Figure 1) shall meet those specified in Table 5. For strip and foil with the width greater than 100mm, they shall be cut into strip and foil with the width less than or equal to 100mm for test, and their transversal bending d shall meet those specified in Table 5.
Keys:
Transversal bending d=q-t;
q——the distance from reference face to the highest cross section;
t——the thickness;
w——the width
Figure 1 Transversal Bending (d)
Table 5 Transversal Bending In: mm
Thickness Transversal bending d
Width 6~20 Width>20~50 Width>50~100
0.07~0.5 ≤0.10 ≤0.02 ≤0.30
>0.5~1.0 ≤0.15 ≤0.25 ≤0.35
>1.0~1.5 ≤0.20 ≤0.30 ≤0.40
>1.5~2.0 — ≤0.35 ≤0.50
3.4 Mechanical property
Tensile test at ambient temperature and hardness test of strip and foil shall meet those specified in Table 6.
3.5 Bending property
The strip and foil may be subjected to 90° bending test, and the test conditions shall meet those specified in Table 6. After the test, the external surface of the bent part shall be free from cracks visible to naked eyes.
Table 6 Mechanical Property and Bending Property
Designation State Tensile test Hardness test 90° bending test
Tensile strength
Rm/MPa Elongation after fracture
A50mm/% Vickers hardness
HV Minimum bending radius (inner side)
Parallel to rolling direction
(BW) Vertical to rolling direction
(GW)
Thickness/mm Thickness/mm Thickness/mm
0.1~
0.25 >0.25~2.0 0.1~0.25 >0.25~1.0 0.1~0.25 >0.25~1.0
H85 H01 300~370 ≥16 ≥20 85~115 0×t 0×t 0×t 0×t
H02 350~420 ≥8 ≥12 105~135 0×t 0×t 0×t 0×t
H04 410~490 ≥3 ≥4 125~155 0×t 1×t 0×t 0×t
H06 480~560 - ≥2 150~180 1×t 3×t 0×t 0×t
H80 H01
H02
H04
H06 330~410
380~460
440~530
≥510 ≥14
≥7
≥3
— ≥18
≥10
≥4
— 90~120
110~140
130~160
155~185 0×t
0×t
0×t
1×t 0×t
0×t
1×t
3×t 0×t
0×t
0×t
0×t 0×t
0×t
0×t
0×t
H70
H68 H01
H02
H04
H06 350~430
410~490
480~560
550~540 ≥21
≥9
≥4
— ≥25
≥12
≥6
≥2 95~125
120~155
150~IS0
170~200 0×t
0×t
1×t
2×t 0×t
1×t
2×t
3×t 0×t
0×t
0×t
0×t 0×t
0×t
0×t
1×t
H66
H65
H63
H62 H01
H02
H04
H06 350~430
410~490
480~560
550~640 ≥19
≥8
≥3
— ≥23
≥10
≥5
≥2 95~125
120~155
150~180
170~200 0×t
0×t
1×t
1×t 0×t
1×t
2×t
3×t 0×t
0×t
0×t
0×t 0×t
0×t
0×t
1×t
QSn4-0.3 H01
H02
H04
H06 390~490
480~570
540~630
≥610 ≥11
≥4
≥3
— ≥13
≥5
≥4
≥2 115~155
150~180
170~200
≥190 0×t
0×t
1×t
— 0×t
1×t
2×t
— 0×t
0×t
0×t
— 0×t
0×t
0×t
—
QSn5-0.3 H01
H02
H04
H06 400~500
490~580
550~640
630~720 ≥14
≥8
≥4
— ≥17
≥10
≥6
≥3 120~160
160~190
180~210
200~230 0×t
0×t
1×t
2×t 0×t
0×t
2×t
3×t 0×t
0×t
0×t
0×t 0×t
0×t
0×t
1×t
QSn6.5-0.1 H01
H02
H04
H06 420~520
500~590
560~650
640~730 ≥17
≥8
≥5
≥3 ≥20
≥10
≥7
≥4 125~165
160~190
180~210
200~230 0×t
0×t
1×t
2×t 0×t
1×t
2×t
3×t 0×t
0×t
0×t
0×t 0×t
0×t
0×t
1×t
QSn8-0.3 H01
H02
H04
H06
H08 450~550
540~630
600~690
660~750
≥740 ≥20
≥13
≥5
≥3
— ≥33
≥15
≥7
≥4
— 135~175
170~200
190~220
210~240
≥230 0×t
0×t
1×t
2×t
— 0×t
1×t
2×t
1×t
— 0×t
0×t
0×t
1×t
— 0×t
0×t
1×t
2×t
—
BZn12-24 H02
H04
H06 490~580
550~640
620~710 ≥5
—
— ≥6
≥3
≥2 150~180
170~200
190~220 0×t
0×t
— 0×t
1×t
— 0×t
0×t
— 0×t
0×t
—
BZn12-29 H02
H04
H06 520~610
600~690
670~760 ≥3
—
— ≥4
≥2
— 170~200
190~220
210~240 0×t
1×t
3×t l×t
3×t
— 0×t
0×t
1×t 0×t
1×t
2×t
KZn18-20
BZn18-18 H02
H04
H06 500~590
580~670
640~730 ≥3
—
— ≥5
≥2
— 160~190
180~210
200~230 0×t
0×t
— 1×t
2×t
— 0×t
0×t
— 0×t
0×t
—
BZn18-26 H02
H04
H06 540~630
600~700
≥700 ≥3
—
— ≥5
≥2
— 170~200
190~220
≥220 0×t
1×t
— 1×t
3×t
— 0×t
0×t
— 0×t
1×t
—
Notes:
1. Property of the strip and foil beyond the thickness range specified in this table shall be determined through negotiation between the supplier and the purchaser.
2. t is the strip thickness.
3. 0×t represents the bending radius (inner side)≤0.1mm.
4. n×t represents n times strip thickness.
3.6 Surface quality
The surface of strip and foil shall be smooth and clean, and be free from any defect affecting use.
4 Test Methods
4.1 Chemical composition
The chemical composition analysis of strip and foil shall be carried out according to the requirements of GB/T 5121 (all parts) or YS/T 482 or YS/T 483, and the arbitration shall be carried out according to the requirements of GB/T 5121 (all parts).
Foreword i
1 Scope
2 Normative References
3 Requirements
4 Test Methods
5 Inspection Rules
6 Marking, Packaging, Transportation, Storage and Quality Certificate
7 Order (or Contract)
