GOST 18351-73

• gost-18351-73.pdf (690.85 KiB)
  ГОСТ 18351-73

GOST 18351−73 Bars of extruded magnesium alloys. Specifications (with Amendments No. 1, 2, 3)

GOST 18351−73

Group W55

STATE STANDARD OF THE USSR

BARS OF EXTRUDED MAGNESIUM ALLOYS

Specifications

Magnesium alloy extruded rods.
Specifications

GST 18 2361

Date of introduction 1974−01−01

INFORMATION DATA

1. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from 19.01.73 N 120

2. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	The number of the paragraph, subparagraph, enumeration, applications
GOST 9.016−74*	5.3
GOST 166−89	4.2
GOST 427−75	4.2.1
GOST 1497−84	4.4
GOST 3240.0−76 — GOST 3240.21−76	4.5
GOST 4381−87	4.2
GOST 5009−82	2.8
GOST 6456−82	2.8
GOST 6507−90	4.2
GOST 7728−79	4.5
GOST 14192−77**	5.3.1
GOST 14957−76	2.1
GOST 26877−86***	4.2.1

_________________
* Valid GOST 9.511−93, here and hereafter.
** A GOST 14192−96, here and hereafter.
*** A GOST 26877−91, here and hereafter. — Note the CODE.

3. REISSUE with Amendments No. 1, 2, 3, approved in September 1978, July 1983, June 1988 (ICS 6−78, 10−83, 9−88)

This standard applies to extruded bars and rods of circular cross section from magnesium alloy, designed for the needs of national economy and for export.

(Changed edition, Rev. N 3).

1. ASSORTMENT

1.1. The bars are subdivided:

accuracy of manufacturing;

normal accuracy (no symbol);

high accuracy — P;

high precision.

by state of material:

without heat treatment (hot-pressed);

hardened (homogeneous) — T4;

distressed — T1.

(Added, Rev. N 3).

1.1. The diameter of the rods and limit deviation shall be as specified in table.1.

Table 1

Dimensions, mm

Nomi- proportional to the diameter of the rod, mm	Limit deviations of the diameter of the rod, mm			The cross-sectional area of the rod, cm			Theoretical weight of 1 m of wire, kg
high precision	increase increased accuracy	normal accuracy	high precision	increase increased accuracy	normal accuracy	high precision	increase increased accuracy	normal accuracy
5	-0,30	-0,45	-0,72	0,019	0,179	0,169	0,033	0,032	0,030
6	0,027	0,262	0.249 V.	0,048	0,047	0,045
7	-0,36	-0,54	-0,87	0,037	0,355	0,338	0,066	0,064	0,061
8	0,048	0,469	0,449	0,086	0,084	0,081
9	0,061	0,598	0,575	0,110	0,108	0,104
10	0,076	0,742	0,717	0,136	0,134	0,129
11	-0,43	-0,65	-1,05	0,091	0,893	0,860	0,165	0,161	0,155
12	0,109	1,069	1,032	0,196	0,192	0,186
13	0,128	1,260	1,220	0,231	0,227	0,220
14	0,149	1,466	1,424	0,269	0,264	0,256
15	And 0.172	1,688	1,643	0,309	0,304	0,296
16	0,196	1,926	1,878	0,352	0,347	0,338
17	0,221	2,180	2,128	0,398	0,392	The 0.383
18	0,248	2,449	2,394	0,447	0,441	0,431
19	-0,52	-0,78	-1,26	0,276	2,715	2,646	0,496	0,489	0,476
20	0,306	3,015	2,942	0,551	0,543	0,530
21	0,338	3,330	3,253	It was 0.608	0,599	0,586
22	0,371	3,661	3,580	0,668	0,659	0,645
24	0,443	4,370	4,282	0,797	0,787	0,771
25	0,481	4,748	4,656	0,865	0,855	0,838
26	0,520	5,142	5,046	0,937	0,926	0,908
27	0,562	5,551	5,452	1,011	0,999	0,981
28	0,604	5,977	5,873	1,088	1,076	1,057
30	0,695	6,874	6,763	1,251	1,237	1,217
32	-0,62	-0,93	-1,50	0,789	7,797	7,656	1,420	1,403	One thousand three hundred seventy eight
34	0,891	8,817	8,668	1,605	1,587	1,560
35	0,945	9,351	9,197	1,701	1,683	1,655
36	1,000	9,900	9,742	1,801	1,782	1,754
38	1,116	11,046	10,879	2,008	1,988	1,958
40	1,237	12,254	12,078	2,227	2,206	2,174
42	1,365	13,525	13,340	2,457	2,435	2,401
45	1,569	15,550	15,351	2,824	2,799	2,763
46	1,640	16,256	16,053	2,951	2,926	2,890
48	1,786	17,715	17,503	3,215	3,189	3,151
50	1,939	19,237	19,016	3,491	3,463	3,423
52	-0,74	-1,11	-1,80	2,094	20,749	20,472	3,769	3,735	3,685
55	2,344	23,240	22,946	4,219	4,183	4,130
58	Two thousand six hundred nine	25,871	25,562	4,695	4,657	4,601
60	2,793	27,704	27,384	5,027	4,987	4,929
65	3,281	32,561	32,213	5.905 inch	5,861	5,798
70	3,808	37,809	37,435	6,854	6,806	6,738
75	4,374	43,450	43,048	7,874	7,821	7,749
80	4,980	49,482	49,053	8,964	8,907	8,830
85	-	-1,50	-2,10	-	55,649	55,253	-	10,017	9,946
90	62,450	62,031	11,241	11,166
95	69,643	69,201	12,536	12,456
100	77,228	76,762	13,901	13,817
105	85,206	84,716	15,337	15,249
110	-	-1,50	-2,10	-	93,575	93,228	-	16,844	16,781
115	102,336	101,799	18,421	18,324
One hundred twenty	111,489	110,929	20,068	19,967
130	-	-	-2,40	-	-	130,061	-	-	23,411
140	151,041	27,187
150	173,589	31,246
160	197,705	35,587
170	223,389	40,210
180	250,640	45,115
190	-	-	-2,90	-	-	278,721	-	-	50,170
200	309,069	55,633
210	340,986	61,378
220	374,471	67,405
230	409,523	73,714
240	446,144	80,306
250	484,333	87,180
260	-	-	-3,30	-	-	523,279	-	-	94,190
Two hundred eighty	607,433	109,338
300	697,860	125,615

Notes:

1. (Deleted, Rev. N 3).

2. Theoretical weight of 1 m of the rod is calculated with a density equal to 1.80 g/cm, which corresponds to the density of the magnesium alloy MA14 brand.

3. To calculate the approximate theoretical weight of other magnesium alloys should use the conversion factors:

for alloy grade MA1	0,978
for alloy grade MA2	0,989
for grade alloy MA2−1	0,990
for grade alloy MA2−1 p. h.	0,990
for alloy grade MA5	1,000
for alloy grade МА8	0,989
for grade alloy MA14	1,000
for alloy grade MA15	1,011

4. (Deleted, Rev. N 3)


(Changed edition, Rev. N 1, 3)

1.2. The roundness of bars should not exceed the limit deviation for diameter.

1.3. The rods are made long:

from 1 to 6 m with a diameter up to 10 mm;

from 1 to 5 m with diameter over 10 to 50 mm;

from 0.5 to 4 m with diameter over 50 to 150 mm;

from 0.5 to 3 m in diameter St 150 to 300 mm.

The bars are made in segments of random, exact or multiple lengths.

(Changed edition, Rev. N 3).

1.3. Maximum deviations along the length of the bars in fixed lengths and multiple lengths shall not exceed:

+10 mm for bars with diameter from 5 to 50 mm;

+15 mm for bars with diameter over 50 to 120 mm;

+20 mm for rods ø St 120 to 300 mm.

Examples of symbols:

Rod of alloy grade MA5, hardened (homogeneous), with a diameter of 50 mm, normal precision manufacturing, with a length of 1500 mm:

Rod MA5. T4.50х1500 GOST 18351−73

The same high manufacturing precision (P), a length of a multiple of (KD) of 1000 mm:

Rod MA5. T4.50Пх1000 CD key GOST 18351−73

Same, the normal precision manufacturing, random length:

Rod MA5. T4.50 GOST 18351−73.

(Added, Rev. N 3).

1.4. (Deleted, Rev. N 2).

2. TECHNICAL REQUIREMENTS

2.1. Bars manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner, with the chemical composition according to GOST 14957−76.

(Changed edition, Rev. N 2).

2.2. The bars are made:

brand MA5 — hardened (homogeneous) condition in addition to the symbol marks added T4 index (МА5Т4);

brand MA14 — in the artificially aged condition — in addition to naming the brand increases the index of T1 (МА14Т1);

marks MA1, MA2, MA2−1, MA2−1 p. h., MA5, MA8 and MA15 — without heat treatment (hot-pressed) — additional symbols do not have.

2.3. Bars and rods, of alloy grade MA5 in hot-pressed condition made from homogenized ingots.

2.4. Mechanical properties of bars in tension shall conform to the requirements specified in table.2.

Table 2

Grade	Diameter of bars, mm	The test samples	Mechanical properties tensile, not less
Temporary resistance, MPa (kgf/mm)	Yield strength , MPa (kgs/mm)	Elongation , %
MA1	From 8 to 100	Without heat treatment	195 (20,0)	-	2,0
SV. 100 «160	175 (18,0)	-	2,0
«160» 300	165 (17,0)	-	2,0
MA2	From 8 to 100	245 (25,0)	125 (13,0)	6,0
SV. 100 «160	245 (25,0)	125 (13,0)	5,0
«160» 300	215 (22,0)	-	5,0
MA2−1	8 to 10	255 (26,0)	145 (15,0)	8,0
MA2−1 p. h.	SV. 100 «160	255 (26,0)	145 (15,0)	8,0
«160» 300	245 (25,0)	-	5,0
MA5	From 5.0 to 100	Tempered (T4)	295 (30,0)	185 (19,0)	6,0
SV. 100 «160	275 (28,0)	175 (18,0)	5,0
«160» 300	265 (27,0)	-	4,0
From 5.0 to 100	Without heat treatment	295 (30,0)	185 (19,0)	6,0
SV. 100 «160	275 (28,0)	175 (18,0)	5,0
«160» 300	265 (27,0)	-	4,0
MA8	From 8.0 to 50	Without heat treatment	215 (22,0)	-	4,0
SV. 50 «100	205 (21,0)	-	3,0
«100» 160	195 (20,0)	-	2,0
«160» 300	175 (18,0)	-	1,0
MA14	From 8.0 to 100	Artificially aged	315 (32,0)	245 (25,0)	6,0
SV. 100 «160	305 (31,0)	235 (24,0)	6,0
«160» 300	265 (27,0)	175 (18,0)	4,0
MA15	From 8.0 to 50	Without heat treatment	275 (28,0)	215 (22,0)	6,0
SV. 50 «100	295 (30,0)	235 (24,0)	6,0
«100» 160	285 (29,0)	215 (22,0)	5,0
«160» 300	275 (28,0)	-	5,0

Note. (Deleted, Rev. N 2).


(Changed edition, Rev. N 1, 2, 3).

2.5. Surface bars should be subjected to anti-corrosion treatment (oxidation) according to normative-technical documentation.

(Changed edition, Rev. N 3).

2.6. Surface bars should be free of cracks, captive, spots of corrosion origin, various kinds of zapressovat and bright concentric rings, indicating the presence of internal strains.

(Changed edition, Rev. N 1).

2.7. On the surface of rods permitted: nicks, scoring, dents, bubbles, shells, scratches and risks, if the depth does not display a bar for the maximum deviations in diameter and removed the reference sweep.

Allowed surface nabesna a depth of no more than 0.1 mm, for bars with diameter up to 160 mm and not more than 0.3 mm, for bars with diameter over 160 mm.

2.8. To oxidation of the surface allowed local gentle sweep of bars to a depth not more than half the minus tolerance on the diameter of the rod with the subsequent processing of the abrasive cloth according to GOST 6456−82 or GOST 5009−82.

2.9. The macrostructure of bars detected in the transverse microtemplate should be tight and have no cracks, tears, segregated clusters and utain.

2.10. In the macrostructure allowed:

slight surface exfoliation to a depth not more than:

0.4 mm, for bars with diameter up to 50 mm

1.0 mm, for bars with diameter over 50 «100 mm

2.0 mm, for rods with a diameter of 100 to 160 mm,

3.0 mm for rods ø «160 «300 mm;

the presence of non-metallic inclusions and oxide captured in the form of dots with an area of not more than 1 mmor thin lines with a length of not more than 3 mm, if their number does not exceed:

2 PCs. — for bars with diameter up to 50 mm

3 PCs. — for bars with diameter over 50 «100 mm

5 PCs. — for bars with diameter over 100 «160 mm

7 PCs. — for bars with diameter over 160 «of 300 mm;

point intermetallics with a size of 0.4−0.5 mm not more than 5 PCs, as well as the disparate inclusion in the form of single small dots on the bars with diameter over 20 mm and 300 mm.

2.11. Bars should be trimmed evenly at the ends and must not have burrs.

Cut end Squareness, mm should take dimensional or multiple dimensional bar beyond the minimum length and should not exceed 3°.

(Changed edition, Rev. N 3).

2.12. Bars must be straightened.

The local curvature of the bars at 1 m must not exceed:

3 mm, for bars with diameter up to 100 mm;

6 mm, for bars with diameter over 100 to 160 mm;

20 mm for rods ø «160 «300 mm.

The overall curvature of bars should not exceed the local curvature of 1 m for the entire length of the rod.

3. ACCEPTANCE RULES

3.1. The rods take lots. The party must consist of bars of the same brand of alloy, same bottoms, same size, same accuracy, same condition of metal and decorated with a single document about quality that contains:

trademark or the name and trademark of manufacturer;

the name of the consumer;

grade and condition of the metal;

the size and precision of the manufacture of bars;

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

batch number;

the weight of the party;

the date of shipment;

the designation of this standard.

At customer’s request, attached are the protocols for mechanical testing.

(Changed edition, Rev. N 2).

3.2. The surface condition is checked for each rod. The manufacturer checks the condition of the surface before oxidation and after oxidation (to check the continuity of the oxide film).

(Changed edition, Rev. N 2).

3.3. Checking the dimensions and curvature are subjected to each rod.

3.4. Verification of the mechanical properties subjected to 10% bars party, but not less than two bars.

(Changed edition, Rev. N 2).

3.5. The test yield is carried out at the request of the consumer.

(Changed edition, Rev. N 2).

3.6. To check the macrostructure from each lot of bars with a diameter of over 20 mm are selected at least 10% of bars, but not less than two bars.

Bars with a diameter less than 20 mm checking the macrostructure are not exposed.

3.7. To determine the chemical composition selected two bars from the party.

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

(Changed edition, Rev. N 2).

3.8. If unsatisfactory test results of at least one of the indicators it is carried out re-testing at twice the sample taken from the same batch.

The results of repeated tests apply to the entire party.

May be performed piece-by-piece control rods.

(Changed edition, Rev. N 2).

3.9. (Deleted, Rev. N 2).

4. TEST METHODS

4.1. Inspection of bars shall be made without the use of optical devices.

4.2. The measurement of the diameter of bars is carried out with a micrometer according to GOST 6507−90 or GOST 4381−87, caliper according to GOST 166−89 or other tool, to ensure the necessary measurement accuracy.

(Changed edition, Rev. N 3).

4.2.1. The curvature of the bars test in the following manner: the rod is placed on a test plate according to normative-technical documentation. To check the measuring rod is applied a metal ruler, 1 m long according to GOST 427−75 and using the probe for NTD measure the maximum distance between the line and rod according to GOST 26877−86.

Allowed to use other methods and measuring tools that provide required accuracy.

(Added, Rev. N 3).

4.2. To check the mechanical properties of each check rod from the output end in the longitudinal direction, cut one sample.

(Changed edition, Rev. N 2).

4.3. Samples for testing mechanical properties of selected:

when the diameter of bars up to 30 mm from the center of the cross section of the rod;

bars with a diameter over 30 up to 300 mm — half the cross section of the rod;

thus, the center of the sample should be at a distance of the radius rod.

4.4. The tensile test is carried out — in accordance with GOST 1497−84.

The estimated length of the sample in millimeters is calculated by the formula:

where  — the estimated bar diameter, mm.

4.5. Determination of the chemical composition of magnesium alloys is carried out according to GOST 3240.0−76 -GOST 3240.21−76 or GOST 7728−79.

(Changed edition, Rev. N 2).

4.6. Macrostructure of bars on the cross check microtemplate carved with utrennego the end of the check rod. In the presence of utiny or delamination to check the bars (subject to compliance with the macrostructure of the other requirements) they should be removed completely, but all the other bars of the party cut to value the highest prevalence of utiny.

(Changed edition, Rev. N 2).

5. MARKING, PACKING, TRANSPORTATION

5.1. Taken on the rods with a diameter more than 20 mm put the stamp of the technical control Department of the manufacturer and a mark indicating the grade alloy, the metal state and batch number.

On the bars with diameter 20 mm placed stamp of the technical control Department of the manufacturer, grade, condition of metal and batch number indicated on the tag attached to the bundle of rods.

On the bars with 30 mm diameter put a stigma on the lateral surface at a distance of not more than 20 mm from the end, and on bars with a diameter greater than 30mm the mark is put on the front end of the rod (the butt end).

5.2. On the bars, from which were taken samples for mechanical testing, put a sequence number.

5.3. Temporary corrosion protection, packaging, transportation and storage — by GOST 9.016−74.

By agreement between manufacturer and consumer bars with the diameter more than 50 mm it is allowed to transport without lubrication and packaging.

(Changed edition, Rev. N 1, 3).

5.3.1. Transport marking — according to GOST 14192−77 with an additional label:

the name of the semi-finished product, grade,

the condition of the material,

size bars

batch number.

(Added, Rev. N 3).

5.3.2. Marking of bars intended for export, is carried out in accordance with the order of foreign trade enterprises.

(Added, Rev. N 3).

5.4. (Deleted, Rev. N 1, 2).