GOST 19441-74

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  ГОСТ 19441-74

GOST 19441−74 Pipe extruded from magnesium alloys. Specifications (with Amendments No. 1, 2, 3)

GOST 19441−74
Group В64

STATE STANDARD OF THE USSR

PIPE EXTRUDED FROM MAGNESIUM ALLOYS

Specifications

Magnesium-alloy extruded tubes.
Specifications

GST 18 2351

Valid from 01.01.75
until 01.01.2000*
_______________________________
* Expiration removed
Protocol N 7−95 Interstate Council
for standardization, Metrology and certification.
(IUS N 11, 1995). — Note the CODE.

INFORMATION DATA

1. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards of 23 January 1974, No. 222

2. INTRODUCED FOR THE FIRST TIME

3. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

_________________
* On the territory of the Russian Federation GOST 7502−98, here and hereafter.
** A GOST 14192−96, here and hereafter.
*** A GOST 9.511−93, here and hereafter. — Note the CODE.

4. Validity extended up to 01.01.2000 by Decree of Gosstandart of the USSR from 16.06.89 N 1677

5. REISSUE with Amendments No. 1, 2, 3, approved in February 1979, July 1984-June 1989 (IUS 4−79, 11−84, 9−89).


This standard applies to extruded tubes made of magnesium alloys.

(Changed edition, Rev. N 3).

1a. CLASSIFICATION

1a.1. The pipe on the condition of the material is divided into:

without heat treatment (hot-pressed) — marked brand name of the alloy without additional signs, annealed — M.

Sec. 1A (optionally Entered, Rev. N 2).

1. ASSORTMENT

1.1. Outer diameter, wall thickness, tolerances for it and the theoretical mass of pipes shall conform to the requirements specified in table.1.

Table 1

1.2. The length of the pipe shall be manufactured of random length from 2 to 4 m;

measuring length or multiples of it — within off-gage length.

1.3. Maximum deviations on length of pipes shall not exceed +15 mm.

Pipe multiple lengths manufactured with an allowance for each cut is 5 mm and the limit deviation for the total length of the established tolerances for pipe lengths.

(Changed edition, Rev. N 2).

1.4. When calculating theoretical weight of 1 m pipe wall thickness and outer diameter are accepted at face value, and the density of magnesium alloy is equal to 1.79 g/cm, which corresponds to the density of magnesium alloys MA2−1 and MA2−1 p. h.

To calculate the theoretical mass of pipes of alloy grade MA8 should use a transfer coefficient 0,994.

Examples of symbols

Tubes of alloy grade MA8, without heat treatment, with an outer diameter of 20 mm, a wall thickness of 2 mm random length:

Pipe 20X2 МА8 GOST 19441−74

However, in the annealed condition, length 3000 mm:

Pipe МА8. M 20х2х3000 GOST 19441−74

(Changed edition, Rev. N 2, 3).

2. TECHNICAL REQUIREMENTS

2.1. Pipe manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

Tubes made of magnesium alloys MA2−1, MA2−1P.h. and МА8 with the chemical composition according to GOST 14957−76.

(Changed edition, Rev. N 2).

2.2. (Deleted, Rev. N 2).

2.3. Mechanical properties of pipes shall conform to the requirements specified in table.2.

Table 2

2.4. The pipes must be trimmed evenly and must not have burrs. Cut end Squareness, mm should not exceed half the tolerance on length of pipes.

2.6. Surface of the pipe should be subjected to anti-corrosion treatment (oxidation) according to normative-technical documentation.

(Changed edition, Rev. N 1).

2.6. The outer surface of the pipe must be clean (free from contamination, hindering its inspection). Cracks, delamination, burrs, shells, various kinds of pressing, and foreign inclusions and spots of corrosion origin are not allowed.

On the outer surface of the pipe is not allowed bubbles, slivers, nicks, scratches, risks, if they control the sweep output tube for limiting the negative deviation of wall thickness.

2.7. Pipe must be straight. The deviation from straightness shall not exceed 1 mm per 1 m length. Total deviation from straightness shall not exceed the permissible deviations from straightness per 1 m of pipe length in meters.

(Changed edition, Rev. N 2).

2.8. Ovality and raznoshennoy pipes should not display their sizes for maximum deviations, respectively from the outside diameter and wall thickness.

2.9. To achieve the desired geometry allowed calibration of pipes after pressing or final annealing.

3. ACCEPTANCE RULES

3.1. Pipes take by the parties. The party should consist of tubes made of an alloy of one brand, one state, one melting or heat treatment batch, the same size and decorated by one document on quality.

Allowed to make a batch of heat-treated pipes, taken from several batches of heat treatment or multiple trunks, provided that each cage or melting meet the requirements of this standard.

The document about quality should contain:

trademark or the name and trademark of manufacturer;

the name of the consumer;

grade and condition of the material;

the sizes of pipes;

batch number;

the weight of the party;

test results (mechanical properties indicate only the maximum and minimum values);

the date of manufacture;

the designation of this standard.

(Changed edition, Rev. N 2).

3.2. Monitoring external surfaces subjected every pipe twice before oxidation and after oxidation (to check the continuity of the oxide film).

(Changed edition, Rev. N 2).

3.3. Control sizes are subjected to each pipe.

3.4. To determine the mechanical properties of two pipe selected by the party.

(Changed edition, Rev. N 2).

3.5. (Deleted, Rev. N 2).

3.6. To determine the chemical composition of the alloying elements and main impurities — select two tubes from the party.

Allowed the manufacturer to determine the chemical composition of the magnesium alloys for each cast.

3.7. If unsatisfactory test results of at least one indicator thereon, a second test of the doubled sample taken from the same batch. The results of repeated tests apply to the entire party.

Allowed the manufacturer to conduct routine inspection of the tubes.

3.6; 3.7. (Changed edition, Rev. N 2).

4. TEST METHODS

4.1. Determination of chemical composition shall be carried out by chemical methods according to GOST 3240.0−76 — GOST 3240.21−76 or spectral method GOST 7728−79.

Selection and preparation of samples for determining the chemical composition of the pipes is carried out according to GOST 24231−80.

The differences in the evaluation of the chemical composition analysis is carried out according to GOST 3240.0−76 — GOST 3240.21−76.

4.2. Measurement of pipes the outside diameter and wall thickness is carried out with a micrometer according to GOST 6507−90 or other tool, to ensure the necessary measurement accuracy.

The length of the pipe test tape according to GOST 7502−89 or metal ruler according to GOST 427−75.

4.3. The deviation from straightness of tubes check the following method. The tube is placed on a test plate. When determining the total deviation from straightness check of the pipe hold in a given position, using probes to measure the maximum distance (gap) between the plate and the pipe. In determining deviations from straightness per 1 m to check the pipe, make a hard steel line length of 1 m and using the probes to measure the maximum distance between the line and pipe.

4.4. Inspection of the outer surface of the pipe is carried out without the use of magnifying devices.

4.5. For the tensile test from each selected pipe is cut according to two samples. The selection and preparation of samples for tensile tests carried out according to GOST and GOST 24047−80 10006−80.

The tensile test is carried out according to GOST 10006−80 longitudinal samples with the calculated length .

Sec. 4. (Changed edition, Rev. N 2).

5. LABELING, PACKAGING AND TRANSPORTATION

5.1. The tubes are connected in bundles. Each beam is labeled with indication of alloy grades, the condition of the material, the batch number and the mark of the technical control Department of the manufacturer.

5.2. At the request of the consumer at every pipe diameter greater than 30 mm must be applied to the data referred to in paragraph 5.1.

5.3. Temporary corrosion protection, packaging, transportation and storage GOST 9.016−74. Transport marking of packages — according to GOST 14192−77 with application of the following additional endorsements:

product;

grade alloy;

state of the material;

pipe sizes;

batch number.

(Changed edition, Rev. N 2).

5.4−5.8. (Deleted, Rev. N 1).

5.9. (Deleted, Rev. N 2).