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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 2072-2007 Nickel and nickel alloy strips. In addition to editorial changes, the following main technical changes have been made with respect to GB/T 2072-2007:
——the grades and technical requirements of nickel foils are added (see Clauses 3 and 4);
——the specification range is modified: the thickness is changed from "0.05~1.2" to "0.01~5.00", and the width is changed from "20~250" to "20~1,350" (see Table 1; Table 1 of Edition 2007);
——the thickness, width and their tolerances are modified: the width tolerance of products with thickness not greater than 0.3mm is changed from "(0, -0.6), (0, -1.0)" to "±0.15"; the width tolerance of products with thickness greater than 0.3mm is changed from "(0, -1.0), (0, -1.5)" to "(+1.6, 0)" (see Table 2; Table 2 of Edition 2007);
——the cupping test method is modified: the punch diameter of cupping test is changed from "10mm" to "20mm" (see 5.4.1; 4.3 of Edition 2007);
——the bending property requirements for products are added (see 4.4.2);
——the grain size requirements for products are added (see 4.5).
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 editions of this standard are as follows:
——GB/T 2072-1980, GB/T 2072-1993 and GB/T 2072-2007;
——GB/T 11088-1989.
Nickel and nickel alloy strip and foil
1 Scope
This standard specifies the classification and labeling, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage, as well as quality certificates and order form (or contract) contents of nickel and nickel alloy strip and foil.
This standard is applicable to nickel and nickel alloy strip and foil used in industrial fields such as instruments, communications and electronics.
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 4156 Metallic materials - Sheet and strip - Erichsen cupping test
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method
GB/T 5235 Wrought nickel and nickel alloys - Chemical composition and forms of wrought products
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 8647
(All parts) The methods for chemical analysis of nickel
GB/T 8888 Wrought heavy non-ferrous metal products - Packing, marking, transportation, storing and certificate of quality
YS/T 325 (All parts) Methods for chemical analysis of nickel-copper alloy
3 Classification and labeling
3.1 Product classification
Grade, variety, condition and specification of the product shall meet those specified in Table 1.
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Table 1 Grade, variety, condition and specification of the product
Grade Variety Condition Specification
mm
Thickness Width Length
N2, N4, N5, N6, N7 and N8 Foil Hard (Y) 0.01~0.02 20~200 —
Hard (Y), soft (M) >0.02~0.25 20~300 —
N4, N5, N6, N7, NMg0.1, DN, NS10.19, NCu40-2-1, NCu28-2.5-1.5, NW4-0.15, NW4-0.1, NW4-0.07 and NCu30 Strip Hard (Y)
Semi-hard (Y2)
Soft (M) >0.25~0.30 20~300 ≥3,000
>0.30~0.80 20~1,100 ≥5,000
>0.80~5.00 20~1,350 ≥5,000
3.2 Product labeling
A product shall be labeled in the order of product name, standard number, grade, condition and specification.
Example 1: A 0.03mm×100mm (thickness × width) hard foil made of N2 material with a general precision shall be labeled as follows:
Nickel foil GB/T 2072-N2Y-0.03×100
Example 2: A 1.00mm×1,000mm (thickness × width) soft strip made of N6 material with a high precision shall be labeled as follows:
Nickel strip GB/T 2072-N6M high-1.00×1,000
4 Technical requirements
4.1 Chemical composition
Chemical composition of each grade of product shall meet the requirements of GB/T 5235.
4.2 Overall dimension and its tolerance
4.2.1 The thickness and width as well as their tolerances of the product shall meet those specified in Table 2.
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Table 2 Thickness and width as well as their tolerances of the product
In mm
4.2.2 The side curvature of the product shall not be greater than 3mm/m.
4.2.3 The product shall be straight, with both sides cut neatly and be free of crack and crimp.
4.3 Mechanical properties
4.3.1 The results of tensile tests at room temperature for strips shall meet those specified in Table 3.
Foreword i
1 Scope
2 Normative references
3 Classification and labeling
4 Technical requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation, storage and quality certificate
8 Order (or contract) contents
