GOST 7221-2014

• gost-7221-2014.pdf (451.16 KiB)
  ГОСТ 7221-2014

GOST 7221−2014 Strips of gold, silver and alloys based on them. Specifications

GOST 7221−2014

INTERSTATE STANDARD

STRIPS OF GOLD, SILVER AND ALLOYS BASED ON THEM

Specifications

Strips made of gold, silver and their alloys. Specifications

ISS 77.150.99

Date of introduction 2015−09−01

Preface

Goals, basic principles and main procedure of works on interstate standardization have been established in GOST 1.0−92 «interstate standardization system. Basic provisions» and GOST 1.2−2009 «interstate standardization system. Interstate standards, rules and recommendations on interstate standardization. The procedure of development, adoption, application, renewal and cancellation"

Data on standard

1 DEVELOPED by the Interstate technical Committee for standardization MTK 304 «Noble metals, alloys and industrial products», JSC «Ekaterinburg plant for processing non-ferrous metals"

2 as AMENDED by the Federal Agency for technical regulation and Metrology

3 ACCEPTED by the Interstate Council for standardization, Metrology and certification (Protocol No. 67-P dated 30 may 2014)

The standard was accepted by voting:

Short name of the country on MK (ISO 3166) 004−97	Country code MK (ISO 3166) 004−97	Abbreviated name of the national authority for standardization
Armenia	AM	Agency Farmstandart
Belarus	BY	Gosstandart Of The Republic Of Belarus
Kazakhstan	KZ	Gosstandart Of The Republic Of Kazakhstan
Kyrgyzstan	KG	Kyrgyzstandard
Russia	EN	Rosstandart
Tajikistan	TJ	Tajikstandart

4 by Order of the Federal Agency for technical regulation and Metrology dated 26 November 2014 N 1786-St inter-state standard GOST 7221−2014 introduced as a national standard of the Russian Federation from September 1, 2015.

5 REPLACE GOST 7221−80


Information about the changes to this standard is published in the annual reference index «National standards», and the text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in the monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet

1 Scope

This standard applies to cold rolled strip of gold, silver and alloys based on them for technical purposes and for jewellery.

2 Normative references

The present standard features references to the following standards:

GOST 427−75. Ruler measuring metal. Specifications

GOST 6507−90 Micrometers. Specifications

GOST 6835−2002 Gold and alloys on its basis. Brand

GOST 6836−2002 Silver and alloys on its basis. Brand

GOST 8273−75 wrapping Paper. Specifications

GOST 12555.1−83 Alloys, silver-platinum. Method for the determination of silver

GOST 12555.2−83 Alloys, silver-platinum. Method of spectral analysis

GOST 12558.1−78 Alloys palladium-silver. Method for the determination of silver

GOST 12558.2−78 Alloys palladium-silver. Method of spectral analysis

GOST 12561.1−78 Alloys palladium-silver-copper. Method for the determination of copper and silver

GOST 12561.2−78 Alloys palladium-silver-copper. Method of spectral analysis

GOST 12562.1−82 Alloys gold-platinum. Method for the determination of gold

GOST 12562.2−82 Alloys gold-platinum. Methods of spectral analysis

GOST 12563.1−83 Alloys gold-palladium. Method for the determination of gold

GOST 12563.2−83 Alloys gold-palladium. Method of spectral analysis

GOST 12564.1−83 Alloys gold-palladium-platinum. Method for the determination of gold, palladium, platinum

GOST 12564.2−83 Alloys gold-palladium-platinum. Method of spectral analysis

GOST 14192−96 Marking of cargo

GOST 15150−69 Machines, instruments and other technical products. Versions for different climatic areas. Categories, conditions of use, storage and transportation of the impact of climatic factors of the external environment

GOST 16321.1−70 Silver-copper alloys. Method of determining mass percentage of silver

GOST 16321.2−70 Silver-copper alloys. Method of spectral analysis

GOST 17234−71 Gold alloys. Method of determination of gold and silver

GOST 17235−71 Gold alloys. Spectral method of determination of bismuth, antimony, lead and iron

GOST 22864−83precious metals and their alloys. General requirements for methods of analysis
_______________
In the Russian Federation also has the GOST R 52599−2006.

GOST 24104−2001laboratory Scales. General specifications
_______________
In the Russian Federation GOST R 53228−2008.


GOST 27973.0−88Gold. General requirements for methods of analysis
_______________
In the Russian Federation also has the GOST R 53372−2009.


GOST 27973.1−88Gold. Methods of atomic-emission analysis
_______________
In the Russian Federation also has the GOST R 53372−2009.


GOST 27973.2−88Gold. Method of atomic-emission analysis with inductive plasma
_______________
In the Russian Federation also has the GOST R 53372−2009.


GOST 27973.3−88Gold. Method of atomic-absorption analysis
_______________
In the Russian Federation also has the GOST R 53372−2009.


GOST 28353.0−89 Silver. General requirements for methods of analysis

GOST 28353.1−89 Silver. Method of atomic-emission analysis

GOST 28353.2−89 Silver. Method of atomic-emission analysis with inductive plasma

GOST 28353.3−89 Silver. Method of atomic-absorption analysis

GOST 28798−90 Head of the measuring spring. General specifications

GOST 29329−92Scales for static weighing. General technical requirements
_______________
In the Russian Federation GOST R 53228−2008.


GOST 30649−99 Alloys based on noble metals for jewellery. Brand

Note — When using this standard appropriate to test the effect of reference standards in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet or in the annual information index «National standards» published as on January 1 of the current year, and the editions of the monthly information index «National standards» for the current year. If the reference standard is replaced (changed), when using this standard should be guided by replacing (amended) standard. If the reference standard is cancelled without replacement, then the situation in which the given link applies to the extent that does not affect this link.

3 Terms and definitions

This standard applies the following terms with respective definitions:

3.1 dent: Local deepening of various sizes and shapes with sloping edges.

3.2 pinholes: a Defect of the surface in the form of a single blind or group of point indentations.

3.3 the captivity: the Defect of the surface in the form of delamination, often azkabanu shape, elongated in the warp direction and United with the base metal on one side.

3.4 stratification: The discontinuity of metal, oriented along the direction of deformation.

3.5 crack: a Defect of a surface, representing a rupture of the metal.

3.6 scratch: the surface defects in the form of indentations of irregular shape and an arbitrary direction.

4 symbols and abbreviations

The legend strips are placed according to the scheme:

Use the following abbreviations to indicate the condition of delivery: M — soft, T — hard.

Symbols are examples of bands:

Strip of alloy brand CPM 925, soft, with thickness of 1.60 mm, width 250 mm, length 500 mm:

Streak SRM 925 M 1,6x250x500 GOST 7221−2014

The same, of alloy grade SRAP 80−20, solid, thickness 0.30 mm, width 80 mm, length 200 mm:

Band SRAP 80−20 T 0,3x80x200 GOST 7221−2014

5 Technical requirements

5.1 Main parameters and characteristics (properties)

5.1.1 Strips of gold, silver, and alloys on their basis (hereinafter — band) must conform to the requirements of this standard and be manufactured according to the technological regulations approved in the prescribed manner.

5.1.2 thickness of the strips and limit deviations for thickness shall conform to the values specified in Table 1.


Table 1

In millimeters

The width of the stripes
The nominal value	Limit deviation
From 0.10 to 0.25 incl.	-0,02
SV. 0,25 to 0,45 incl.	-0,03
SV. Of 0.45 to 0.70 incl.	-0,04
SV. Of 0.70 to 1.20 incl.	-0,05
SV. Of 1.20 to 1.80 incl.	-0,07
SV. Of 1.80 to 2.50 incl.	-0,09
SV. Of 2.50 to 4.00 incl.	-0,10
SV. Of 4.00 to 5.00 incl.	-0,12
SV. Of 5.00 to 10.00 incl.	-0,14
Note — By agreement with consumer it is allowed manufacture of strips with other limiting disabilities

5.1.3 the Width of strips length of strips and limit deviations in it depending on thickness shall conform to the values specified in Table 2.


Table 2

In millimeters

Nominal thickness	Limit deviation width when the width of the		Limit deviation of length at length
50; 60; 70; 80; 100	120; 160; 180; 200; 250; 300	200	250	320	400	500
From 0.10 to 0.32.	-1,8		-2	-3			-4
SV. 0.32−0.90 incl.	To 2.0		-2	-3		-4
SV. Of 0.90 to 4.00 incl.	Is 3.0		-3			-4
SV. Of 4.00 to 10.00 incl.	Is 3.0	-4,0	-4			-5
Note — By agreement with consumer it is allowed manufacture of strips of different width and length, and/or other limiting disabilities

Allowed in the party random width and length of strips: not more than 10% of the batch weight.

5.1.4 Theoretical mass of a 1 cmstrips of gold, silver and alloys based on them are given in Appendix A.

5.1.5 Chemical composition of the bands for technical purposes must comply with GOST 6835, 6836 GOST, for jewelry production — GOST 30649.

Note — By agreement with consumer it is allowed manufacture of strips of the other alloys based on gold and silver.

5.1.6 Strip manufactured in soft (annealed) and hard (unannealed) condition.

The state of the metal should be specified in the order. If the order specifies the delivery status, the strip is manufactured in hard (unannealed) condition.

5.1.7 the surface of the strips should not be captured, cracks, delamination.

Allowed color of a tint, local darkening lanes, and surface damage (dents, scratches, nakoly, traces of Stripping), not deducing the strip at reference sweep for tolerances for thickness.

5.1.8 Strips should be trimmed evenly and must not have ragged edges.

5.1.9 Physical-mechanical properties of strips are given in Appendix B.

5.1.10 Properties of jewellery alloys based on gold and silver is given in GOST 30649.

5.2 Labeling, packaging

5.2.1 At the corner of each strip is marked, containing:

mark metal, alloy;

— the batch number.

— trademark of the manufacturer.

The marking of strips with thickness of less than 0.32 mm is not possible.

5.2.2 stack of strips, wrapped in paper according to GOST 8273, must be Packed in solid wooden boxes or padded plywood strips and Packed in cloth bags.

The free space in the box filled with soft packing material to protect the strips from mechanical damage.

Can be applied to other types of packaging and materials to ensure the safety lanes during transportation and storage.

5.2.3 Boxes (bags) sealed, or seal the wax seals of the manufacturer. The seal (stamp) needs to have a clear impression.

In each case attached to the bag tag point:

— the name of the consumer;

— the name of the manufacturer;

— the cost of the package;

— number of parcels;

— the net mass, g;

— gross mass, g;

— the number of the registry.

Labeling boxes according to GOST 14192 with the indication of manipulation sign «Fragile. Caution."

5.2.4 gross Mass of the packing space should not exceed 10 kg.

5.2.5 Each party bands accompany a document about quality that contains:

is the trademark or name and trademark of manufacturer;

— the symbol of the band;

— the batch number;

— chemical composition;

— the number of bands in the party.;

— a lot of bands in the party, g;

— the month and year of manufacture;

stamp of technical control.

The document about quality packaging Packed in last place, which is a corresponding note.

6 acceptance Rules

6.1 Strip take parties. The party should consist of strips of the same brand of metal or alloy, same size, same delivery status. The weight of the batch is not limited.

6.2 Checking the surface quality and dimensions in compliance with the requirements of 5.1.2, 5.1.3, 5.1.6, 5.1.7 should be subjected to not less than 25% of the bands of the party, but not less than three bands.

6.3 To check the chemical composition for compliance with 5.1.4 user selects one strip from the party, manufacturer — a sample from each heat.

6.4 Upon receipt of unsatisfactory results according to the chemical composition it is carried out re-testing at twice the sample or the sample taken from the same batch. The results of repeated tests apply to the entire party.

6.5 the marking is subjected to each lane, checking the packaging and the gross mass of each package unit.

7 control Methods

7.1 the thickness of the strips is measured at a distance of not less than 25 mm from the vertex of the angle and not less than 15 mm from the edge of the micrometer according to GOST 6507. The width and length of strips to measure metal ruler according to GOST 427.

Allowed the use of other measuring instruments providing the required accuracy.

7.2 Checking the quality of the surface bands in compliance with the requirements of 5.1.6 and 5.1.7 is carried out by visual inspection without the use of magnifying devices.

7.3 the weight of the strips is determined on laboratory weights according to GOST 24104, the gross weight on the scales according to GOST 29329.

7.4 Chemical composition determines:

gold — according to GOST 27973.0, GOST 27973.1, 27973.2 GOST, GOST 27973.3;

silver — 28353.0 GOST, GOST 28353.1, 28353.2 GOST, GOST 28353.3;

alloys based on gold — GOST 12562.1, 12562.2 GOST, GOST 12563.1, 12563.2 GOST, GOST 12564.1, 12564.2 GOST, GOST 17234, 17235 GOST, GOST 22864;

alloys based on silver — GOST 12555.1, 12555.2 GOST, GOST 12558.1, 12558.2 GOST, GOST 12561.1, 12561.2 GOST, GOST 16321.1, 16321.2 GOST, GOST 22864 or by other methods, certified in the prescribed manner and providing the requirements of this standard.

7.5 Marking and packaging checks visual inspection.

8 Transportation and storage

8.1 Transport, storage and accounting of strips is carried out in accordance with the order of storage, transportation and accounting of precious metals.

8.2 transport and storage of strips should be protected from dirt, mechanical damage, moisture, corrosive environments, fume sulfur compounds.

Storage conditions in climatic factors 1.1 in accordance with GOST 15150, conditions for transportation — 3 according to GOST 15150.

9 manufacturer’s Warranty

9.1 the Manufacturer guarantees the conformity of the chemical composition and size of the bands of gold, silver, and alloys on their basis the requirements of this standard, under the conditions of transportation and storage prescribed by this standard.

Warranty period bands of 10 years from the date of manufacture. The date of manufacture should be the date of issue of the certificate about quality.

Annex a (informative). Theoretical weight of 1 sq cm strips of gold, silver and alloys based on them

Appendix A
(reference)

The theoretical mass of a 1 cmstrips of gold, silver and alloys based on them

Table A. 1

Strip thickness, mm	The theoretical mass of a 1 cmstrips g, from grades
99,99 Zł; PLN 99,9	Slsr 75−25	Clsrm 95−2,5	Clsrm 75−12,5	Clsrm 58,5−8	Clsrm 58,5−20	HWP 98	Zln 95
0,10	0,1930	0,1596	0,1835	0,1545	0,1324	0,1360	0,1886	0,1824
0,12	0,2316	0,1915	0,2202	0,1854	0,1589	0,1632	0,2263	0,2189
0,14	0,2702	0,2234	0,2569	0,2163	0,1854	0,1904	0,2640	0,2554
0,15	0,2895	0,2394	0,2753	0,2318	0,1986	0,2040	0,2829	0,2736
0,16	0,3088	0,2554	0,2936	0,2472	0,2118	0,2176	0,3018	0,2918
0,18	0,3474	0,2873	0,3303	0,2781	0,2383	0,2448	0,3395	0,3283
0,20	0,3860	0,3192	0,3670	0,3090	0,2648	0,2720	0,3772	0,3648
0,22	0,4246	0,3511	0,4037	0,3399	0,2913	0,2992	0,4149	0,4013
0,25	0,4825	0,3990	0,4588	0,3863	0,3310	0,3400	0,4715	0,4560
0,30	0,5790	0,4788	0,5505	0,4635	0,3972	0,4080	0,5658	0,5472
0,35	0,6755	0,5586	0,6423	0,5408	0,4634	0,4760	0,6601	0,6384
0,40	0,7720	0,6384	Area of 0.7340	0,6180	0,5296	0,5440	0,7544	0,7296
0,45	0,8685	0,7182	0,8258	0,6953	0,5958	0,6120	0,8487	0,8208
0,50	0.9650 levels	0,7980	0,9175	0,7725	0,6620	0,6800	0,9430	0,9120
0,55	1,0615	0,8778	1,0093	0,8498	0,7282	0,7480	1,0373	1,0032
0,60	1,158	0,958	1,101	0,927	0,794	0,816	1,132	1,094
0,70	1,351	1,117	1,285	1,082	0,927	0,952	1,320	1,277
0,80	1,544	1,277	One thousand four hundred sixty eight	1,236	1,059	1,088	1,509	1,459
0,90	1,737	1,436	1,652	1,391	1,192	1,224	1,697	1,642
Of 1.00	1,930	1,596	1,835	1,545	1,324	1,360	1,886	1,824
1,10	2,123	1,756	2,019	1,700	1,456	1,496	2,075	2,006
1,20	2,316	1,915	2,202	1,854	1,589	1,632	2,263	2,189
1,50	2,895	2,394	2,753	2,318	1,986	2,040	2,829	2,736
1,60	3,088	2,554	2,936	To 2.472	2,118	2,176	3,018	2,918
1,80	3,474	2,873	3,303	2,781	2,383	2,448	3,395	3,283
Of 2.00	3,860	3,192	3,670	3,090	2,648	2,720	3,772	3,648
2,20	Of 4.246	3,511	4,037	3,399	2,913	2,992	4,149	4,013
2,50	4,825	3,990	4,588	3,863	3,310	3,400	4,715	4,560
2,80	5,404	4,469	5,138	4,326	3,707	3,808	5,281	5,107
Of 3.00	5,790	4,788	Five thousand five hundred five	4,635	3,972	4,080	5,658	5,472
Of 4.00	7,720	6,384	7,340	6,180	5,296	5,440	7,544	7,296
5,00	9,650	7,980	9,175	7,725	6,620	6,800	9,430	9,120
6,00	11,580	9,576	11,010	9,270	7,944	8,160	11,316	10,944
7,00	13,510	11,172	12,845	10,815	9,268	9,520	13,202	12,768
8,00	15,440	12,768	14,680	12,360	10,592	10,880	15,088	14,592
9,00	17,370	14,364	16,515	13,905	11,916	12,240	16,974	16,416
10,00	By 19,300	15,960	18,350	15,450	13,240	13,600	18,860	18,240

Continuation of table A. 1

Strip thickness, mm	The theoretical mass of a 1 cmstrips g, from grades
To 99.99 MS; MS To 99.9	SRM 95	SRM is 87.5	SRM 50	Srpl 96−4	Srpl 88−12	SRAP 80−20	SRAP 70−30	Sbdm 50−30
0,10	0,1050	0,1041	0,1028	0,0966	0,1072	0,1119	0,1079	0,1095	0,1056
0,11	0,1155	0,1145	0,1131	0,1063	0,1179	0,1231	0,1187	0,1205	0,1162
0,12	0,1260	0,1249	0,1234	0,1159	0,1286	0,1343	0,1295	0,1314	0,1267
0,14	0,1470	0,1457	0,1439	0,1352	0,1501	0,1567	0,1511	0,1533	0,1478
0,15	0,1575	0,1562	0,1542	0,1449	0,1608	0,1679	0,1619	0,1643	0,1584
0,16	0,1680	0,1666	0,1645	0,1546	0,1715	0,1790	0,1726	0,1752	0,1690
0,18	0,1890	0,1874	0,1850	0,1739	0,1930	0,2014	0,1942	0,1971	0,1901
0,20	0,2100	0,2082	0,2056	0,1932	0,2144	0,2238	0,2158	0,2190	0,2112
0,22	0,2310	0,2290	0,2262	0,2125	0,2358	0,2462	0,2374	0,2409	0,2323
0,25	0,2625	0,2603	0,2570	0,2415	0,2680	0,2798	0,2698	0,2738	0,2640
0,30	0,3150	0,3123	0,3084	0,2898	0,3216	0,3357	0,3237	0,3285	0,3168
0,35	0,3675	0,3644	0,3598	0,3381	0,3752	0,3917	0,3777	0,3833	0,3696
0,40	0,4200	0,4164	0,4112	0,3864	0,4288	0,4476	0,4316	0,4380	0,4224
0,45	0,4725	0,4685	0,4626	0,4347	0,4824	0,5036	0,4856	0,4928	0,4752
0,50	0,5250	0,5205	0,5140	0,4830	0,5360	0,5595	0,5395	0,5475	0,5280
0,55	0,5775	0,5726	0,5654	0,5313	0,5896	0,6155	0,5935	0,6023	0,5808
0,60	0,630	0,625	0,617	0,580	0,643	0,671	0,647	0,657	0,634
0,70	0,735	0,729	0,720	0,676	0.750 in	0,783	0,755	0,767	0,739
0,80	0,840	0,833	0,822	0,773	0,858	0,895	0,863	0,876	0,845
0,90	0,945	0,937	0,925	0,869	Of 0.965	1,007	0,971	0,986	0,950
Of 1.00	1,050	1,041	1,028	0,966	1,072	1,119	1,079	1,095	1,056
1,10	1,155	1,145	1,131	1,063	1,179	1,231	1,187	1,205	1,162
1,20	1,260	1,249	1,234	1,159	1,286	1,343	1,295	1,314	1,267
1,50	1,575	1,562	1,542	1,449	1,608	1,679	1,619	1,643	1,584
1,60	1,680	1,666	1,645	1,546	1,715	1,790	1,726	1,752	1,690
1,80	1,890	1,874	1,850	1,739	1,930	2,014	1,942	1,971	1,901
Of 2.00	2,100	2,082	2,056	1,932	2,144	2,238	2,158	2,190	2,112
2,20	2,310	2,290	2,262	2,125	2,358	2,462	2,374	2,409	2,323
2,50	2,625	2,603	2,570	2,415	2,680	2,798	2,698	2,738	2,640
2,80	2,940	2,915	2,878	2,705	3,002	3,133	3,021	3,066	2,957
Of 3.00	3,150	3,123	3,084	2,898	3,216	3,357	3,237	3,285	3,168
Of 4.00	4,200	4,164	4,112	3,864	4,288	4,476	4,316	4,380	4,224
5,00	5,250	5,205	5,140	4,830	5,360	5,595	5,395	5,475	5,280
6,00	6,300	6,246	6,168	5,796	6,432	6,714	6,474	RUB 6,570	6,336
7,00	7,350	7,287	7,196	6,762	7,504	7,833	7,553	7,665	7,392
8,00	8,400	8,328	8,224	7,728	8,576	8,952	8,632	8,760	8,448
9,00	9,450	9,369	9,252	8,694	9,648	10,071	9,711	9,855	9,504
10,00	10,500	10,410	10,280	9,660	10,720	11,190	10,790	10,950	10,560

Annex B (reference). Physico-mechanical properties of strips of gold, silver and alloys based on them

Appendix B
(reference)

Table B. 1

Grade	The calculated density, g/cm	Melting point (range), °C	Hardness HV*, MPa (kgf/mm), the condition of the material
solid, not less	soft, no more
99,99 Zł; PLN 99,9	19,30	1063	490 (50)	290 (30)
Slsr 75−25	Of 15.96	1040−1045	1130 (115)	390 (40)
Slsr 60−40	14,45	1026−1030	1130 (115)	390 (40)
Clsrm 95−2,5	18,35	1005−1030	1370 (140)	490 (50)
Clsrm 75−12,5	15,45	885−900	2650 (270)	1370 (140)
Clsrm 58,5−8	Of 13.24	880−905	2650 (270)	1670 (170)
Clsrm 58,5−20	13,60	830−845	2650 (270)	1670 (170)
To 99.99 MS; MS To 99.9	10,50	962	780 (80)	490 (50)
SRM 95	Of 10.41	870−910	1180 (120)	490 (50)
SRM 92,5	10,36	779−896	1670 (170)	755 (77)
SRM 91,6	10,35	779−888	1130 (115)	(85)
SRM 90	10,32	779−875	1670 (170)	735 (75)
SRM is 87.5	Of 10.28	779−855	1690 (172)	780 (80)
SRAP 70−30	10,95	1155−1220	-	780 (80)
Note — the hardness test was carried out on strips with thickness of 1.0 mm.