GOST 2581-78

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  ГОСТ 2581-78

GOST 2581−78 Alloy magnesium ingots. Specifications (with Amendments No. 1, 2)

GOST 2581−78

Group W51

INTERSTATE STANDARD

MAGNESIUM ALLOY INGOTS

Specifications

Magnesium alloys ingots. Specifications

ISS 77.120.20
GST 17 1442

Date of introduction 1980−01−01

Resolution of the USSR State Committee for standards, dated November 15, 1978 N 2985 date of introduction is established with 01.01.80

Limitation of actions taken by Protocol No. 4−93 of the Interstate Council for standardization, Metrology and certification (ICS 4−94)

REPLACE GOST 2581−71

EDITION with Amendments No. 1, 2 approved in February 1985, March 1989 (IUS 12−84, 6−89)


This standard covers magnesium alloys in ingots, used as sitovoj ingredient in the manufacture of cast and wrought alloys designed for the needs of the national economy and exports.

(Changed edition, Rev. N 2).

1. BRAND

1.1. Depending on the chemical composition establishes the following brands of magnesium alloys: MM2, Mm2ch, MA8C, Ma8cje, Ma8cch, Ma8cbch, MA10C1, МЦр1НЗ.

(Changed edition, Rev. N 1, 2).

2. TECHNICAL REQUIREMENTS

2.1. Magnesium alloys shall be manufactured in accordance with the requirements of this standard in accordance with technical documentation approved in the established order. Chemical composition of magnesium alloys must meet the requirements specified in table.1.

Table 1

Notes:

1. Mass fraction of zirconium in the alloys of MM2, Mm2ch, Ma8cch, Ma8cbch should be no more than 0.001%.

2. Mass fraction of chlorine in all brands of alloys should not be more than 0.005%.

3. Mass fraction of titanium in the alloys of Mm2ch, Ma8cch should be no more than 0,014%, in the alloy Ma8cbch no more than 0.005%; alloy grade MM2 — not more than 0,002%.

4. Mass fraction of beryllium in the alloy brand МЦр1НЗ should be no more than 0.001% in all other brands — 0,002%.

5. By agreement with the consumer grades MA8C, Ma8cch, Ma8cbch mass fraction of aluminium is allowed to 9.5%.

6. (Deleted, Rev. N 1).


(Changed edition, Rev. N 1, 2).

2.2.The alloys are made in the form of ingots with a mass of (8,0±1,0) kg Form and size of ingots are installed by the manufacturer. In coordination with the manufacturer is allowed to produce the alloys in form of ingots of the other mass.

(Changed edition, Rev. N 1).

2.3. On the surface of ingots shall not be flux inclusions and products of combustion of the alloy.

The terms for surface defects and their definitions are given in the Appendix.

(Changed edition, Rev. N 2).

2.4. The surface of ingots shall be subjected to anticorrosive treatment by chromating.

Pigs intended for export, and by agreement with the consumer are additionally coated with a protective grease and wrapped in waxed paper.

(Changed edition, Rev. N 1, 2).

3. ACCEPTANCE RULES

3.1. Magnesium alloys take parties. The party should consist of an alloy of one brand, one or more trunks and decorated with a single document about quality that contains:

trademark or the name and trademark of manufacturer;

grade;

batch number;

the weight of the batch (for bottoms), kg;

the results of the analysis of heats according to content of the main components (the content of impurities is specified by the consumer);

stamp of technical control Department;

the date of manufacture;

the designation of this standard.

The weight of the batch is determined by summing the masses of the bottoms belonging to the party.

3.2. To check the chemical composition of the alloy from each heat included in the party, select three pig. On the manufacturer is allowed to make sampling from liquid metal.

Control of impurities in beryllium, zirconium and chlorine is carried out periodically once a quarter.

3.1; 3.2. (Changed edition, Rev. N 1, 2).

3.3. To check weight pigs three pig taken from every fifth heat. From lots containing less than five heats, three pig be taken away from any heat.

To determine the batch weight weigh every melting.

3.4. Quality control of the surface subjected to 10% of pigs from melting.

At the customer’s request quality control of the surface subjected to each pig.

3.5. If unsatisfactory results at least one of the indicators, repeat tests are carried out on this indicator at twice the sample taken from the same heat.

The results of repeat tests shall apply to the entire melt.

3.4, 3.5. (Changed edition, Rev. N 2).

4. TEST METHODS

4.1. Selection and preparation of samples for chemical analysis according to GOST 24231−80. Method of sampling for chemical analysis — drilling using a drill with a diameter of 15 mm. Mass of spot samples — not less than 15 g. the mass of the laboratory sample was at least 150 g.

(Changed edition, Rev. N 2).

4.2. Chemical composition of alloys determined according to GOST 3240.0−76 — GOST 3240.21−76 and GOST 7728−79.

Allowed to apply other methods of analysis, accuracy is not inferior to the standard.

The chemical composition of the alloys in the event of a dispute is determined only according to GOST 3240.0−76 — GOST 3240.21−76.

Calculation of results is rounded to the last character specified in the table.1.

4.3. The control mass is conducted by weighing with an uncertainty of less than 1% in the scale, the measurement accuracy of which does not exceed 0.1% of the rated load.

4.4. The surface quality of ingots checked by visual inspection without the use of magnifying devices.

(Changed edition, Rev. N 1).

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Each pig shall bear an alpha-numeric or color-coding grade alloy and the melting number. Alphanumeric marking is a marking, color — in the form of colored bands, applied with indelible paint at one end of the pig in accordance with the table.2.

Table 2

(Changed edition, Rev. N 2).

5.2. (Deleted, Rev. N 2).

5.3. (Deleted, Rev. N 1).

5.4.Pig transporterowych in packages.

The formation of packages and their weight — according to GOST 21399−75 and NTD.

Packages are held together by aluminum catalkoy according to GOST 13843−78 with the use of shrink film or without it. Allowed to hold packets of a steel wire of diameter not less than 6 mm according to GOST 3282−74 or steel packing tape according to GOST 3560−73. Packages on pallets weighing up to 0.5 t are allowed to bond only with shrink film.

Allowed to use other means of bonding packages that meet the requirements of GOST 21650−76.

Allowed the transport of pigs in unbatched form in steel barrels for NTD, universal containers according to GOST 18477−79 bulk and road transport.

Pig destined for export Packed in wooden boxes type VI-2 according to GOST 2991−85.

Transport marking in accordance with GOST 14192−96 with additional instruction: indicate grade alloy and heat number (number of heats).

Pig transporterowych by all kinds of transport in covered vehicles in accordance with cargo carriage regulations applicable to transport of this species.

Rail ingots in packages or in barrels transporterowych in covered wagons in carload shipments; ingots, stacked in containers, cars or platforms.

River transport transportation of ingots is carried out by the transport bags or containers.

The carriage of pigs by sea transport is carried out in accordance with the rules of safety of Maritime transport of General cargo.

(Changed edition, Rev. N 1, 2).

5.5. Pig stored in closed ventilated areas.

(Changed edition, Rev. N 1).

6. MANUFACTURER’S WARRANTY

6.1. The manufacturer guarantees the conformity of magnesium alloys with the requirements of this standard if the conditions of transportation and storage.

6.2. Warranty period of storage from date of manufacture:

6 months for ingots of magnesium alloys with anti-corrosion treatment with bichromate of potassium;

2 years for ingots of magnesium alloys with anticorrosive treatment, coated with protective grease, wrapped in waxed paper.

Sec. 6. (Added, Rev. N 1).

APPLICATION (reference). Terms and definitions

APP
Reference

The APP (optionally entered, Rev. N 2).