GOST 25140-93

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  ГОСТ 25140-93

GOST 25140−93 zinc Alloys for casting. Brand

GOST 25140−93

Group W51

INTERSTATE STANDARD

ZINC ALLOYS FOR CASTING

Brand

Zinc alloys for casting. Grades

GST 17 2140

Date of introduction 1995−01−01

Preface

1. DEVELOPED by the Interstate technical Committee 106 «Tsvetmetprokat», State scientific-research and project Institute of non-ferrous metals (Giprotsvetmetobrabotka)

INTRODUCED by Gosstandart of Russia

2. ADOPTED by the Interstate Council for standardization, Metrology and certification (Protocol No. 4−93 of 19 October 1993)

The adoption voted:

3. Resolution of the Committee of the Russian Federation for standardization, Metrology and certification from 02.06.94 160 N interstate standard GOST 25140−93 introduced directly as state standard of the Russian Federation from January 1, 1995

4. REPLACE GOST 25140−82

INFORMATION DATA

REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

________________
* On the territory of the Russian Federation there are GOST 25284.0−95 and GOST 25284.8−95, respectively. Here and further. — Note the manufacturer’s database.

1. This standard establishes the brand of the zinc casting alloys in castings.

2. Brand and chemical composition of the zinc casting alloys have to conform to the standards specified in table.1.

Table 1

Notes:

1. At the request of the consumer grades ZnA14A, Ca4o, CA4 allowed mass fraction of copper as an alloying element to 0.10%.

2. By agreement between manufacturer and consumer in the grades Ca4m3o allowed mass dog tin 0.002% of cadmium is 0.004% when the amount of the impurities of lead, cadmium and tin not more than 0.009%.

3. At the request of the consumer in the alloys of CA4, CA4M1 and CA4M3 mass fraction of lead should not exceed 0,006%.

4. Determination of chemical composition of alloys is carried out according to GOST 25284.0 — GOST 25284.8. Allowed to determine the chemical composition of other methods to ensure accuracy not lower these standards.

If there is disagreement in the assessment of the chemical composition determination is carried out according to GOST 25284.0 — GOST 25284.8.

5. The asterisk indicates the alloys produced in agreement between the consumer and the manufacturer.

3. The mechanical properties of the alloys are given in Appendix 1.

4. Physical characteristics of alloys and recommendations for their use are given in annexes 2 and 3.

ANNEX 1
Reference

MECHANICAL PROPERTIES OF ZINC ALLOYS

1. Mechanical properties of zinc alloys are given in table.2.

Table 2

Note: the symbols of the methods of casting:

N — sand casting;

K — chill casting;

D — die-casting.

2. Mechanical properties determined on separately cast samples after casting in a metal mold under pressure or on specimens manufactured from separately cast samples in the casting in sand molds. The diameter of the working part are separately molded specimens and specimens cut from the samples should be 10 mm, gauge length 50 mm. the Shape and size of specimens, cast under pressure, shown in Fig.

Shapes and sizes of specimens, cast under pressure

Shapes and sizes of specimens, cast under pressure

Round

Flat

3. Separately cast samples for all types of casting experience with the mold crust. Allowed discontinuity foundry peel in places, Stripping the surface of the sample.

4. The method of casting the samples corresponds to the method of manufacturing castings. Allowed for all kinds of casting to test mechanical properties on samples cast in the mold; it should be guided by the mechanical properties of the casting in the mold.

5. In the determination of mechanical properties on specimens cut directly from the body of the castings, the type, size of samples and the level of mechanical properties are established by normative-technical documentation for concrete casting.

6. The test specimens in tension is carried out in accordance with GOST 1497; Brinell hardness number is determined according to GOST 9012.

ANNEX 2 (informative). PHYSICAL CHARACTERISTICS OF ALLOYS

ANNEX 2
Reference

Table 3

APPENDIX 3 (reference). RECOMMENDATIONS FOR USE OF ALLOYS

APPENDIX 3
Reference

Table 4