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GOST 30311-96

GOST 30311−96 spongy Titanium. Method for determination of hardness according to Brinell


GOST 30311−96

Group B59


INTERSTATE STANDARD

TITANIUM SPONGE

Method for determination of hardness according to Brinell

Sponge titanium. Method for determination of Brinell hardness


ISS 77.120*
AXTU 1809

________________________________
* In the index «National standards», 2008

OKS 77.120, 77.120.50 — note the manufacturer’s database.

Date of introduction 2000−07−01



Preface

1 DEVELOPED by the Interstate technical Committee for standardization MTK 105; Ukrainian scientific-research and design titanium Institute

SUBMITTED to the State Committee of Ukraine for standardization, Metrology and certification

2 ADOPTED by the Interstate Council for standardization, Metrology and certification (Protocol No. 9 dated April 12, 1996)

The adoption voted:

   
The name of the state The name of the national authority for standardization
The Republic Of Azerbaijan
Azgosstandart
The Republic Of Kazakhstan
Gosstandart Of The Republic Of Kazakhstan
Russian Federation
Gosstandart Of Russia
Turkmenistan The main state inspection of Turkmenistan
Ukraine
Gosstandart Of Ukraine

3 Resolution of the State Committee of the Russian Federation for standardization and Metrology dated 19 October 1999 No. 353-St inter-state standard GOST 30311−96 introduced directly as state standard of the Russian Federation from July 1, 2000.

4 REPLACE GOST 9853.8−79

1 Scope


This standard specifies a method for determining hardness on the Brinell hardness of sponge titanium according to GOST 17746.

2 Normative references


The present standard features references to the following standards:

GOST 2789−73 surface Roughness. Parameters and characteristics

GOST 9012−59 Metals. Method of measuring hardness Brinell hardness

GOST 17746−96 spongy Titanium. Specifications

GOST 23677−79 Hardness for metals. General technical requirements

GOST 23780−96 spongy Titanium. Methods of sampling and sample preparation

GOST 25086−87 non-ferrous metals and their alloys. General requirements for methods of analysis

3 General requirements


General requirements for the method of determining hardness is according to GOST and GOST 9012 25086.

4 measuring instruments and auxiliary devices


Slotted divider samples for 8−10 servings.

Hydraulic press with pressing force of 1−1. 6 MN (100−160 cu).

Vacuum arc furnace with copper mould with a diameter of 65−70 mm and a height of 70−120 mm.

Lathe.

A device for measuring the hardness according to GOST 23677.

5 preparation for measurement

5.1 Preparation of ingot

5.1.1 Analytical sample, selected in accordance with GOST 23780, on the slot divider divide into 8−10 portions.

5.1.2 Sequential compression each serving prepared electrode with a diameter of not less than 40 mm.

5.1.3 In a vacuum arc furnace, purified mechanically and rubbed the benchmark (ethyl alcohol), consumable electrode melted ingot with a diameter of (65±5) mm wide and (80±5) mm. of Residual pressure in the furnace before melting not higher than 1.33 PA (10 µm RT.St.), leakage — not more than 0,325 PA/(l·s) (2.5 µm RT.St./(l·C)).

5.2 sample Preparation

5.2.1 the Lateral surface of the melted ingot turned on a lathe to remove the shells and then, the thickness of the removed layer should be not less than 5 mm.

5.2.2 Gating part of the ingot butt on the depth of the shrinkage pipe, but not less than 20 mm, from this part of the cut off layer with a minimum thickness of 15 mm.

The cutting during the preparation of the sample: rotation frequency — no more than 1200 rpm, the feed speed is not more than 0.3 mm/Rev, depth of cut of 1.5 mm.

The parameter of surface roughness of end faces ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллюaccording to GOST 2789 must be no more than 2.5 microns.

6 procedures for measuring

6.1 the hardness Measurement is carried out at a temperature of (293ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллю) K.

6.2 During the test the device must be protected from shock and vibration.

6.3 the Supporting surface of the table and stands, as well as supporting the work of the sample surface should be cleaned from extraneous substances.

6.4 the Sample shall be placed on a table or stand steadily in order to avoid its displacement during the test.

6.5 Testing carried out by indentation of a steel ball with a diameter of 10 mm under a load 14715 N (1500 kgf) and endurance of 30 C.

6.6 At the ends of the prepared sample is applied at three points. The distance between the centers of two adjacent prints must be at least 20 mm, and the distance from the center of the print to the edge of the sample — not less than 12.5 mm. to exclude the influence of deformation on the edges of the prints, at the second end applied to prints after the measurement on the first end face or with the use of stands.

6.7 hardness test is performed according to the diameter or depth of the print.

6.7.1 in determining the hardness indentation diameter indentation diameter ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллюis measured with a microscope or other devices with a measuring accuracy of ±0.25% diameter of the ball.

6.7.2 the diameters of the prints ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллюand ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллюmeasure in two mutually perpendicular directions. The diameter of the print ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллюis taken the arithmetic average of the measurement results. The difference between the measurements of the diameters of the single print must not exceed 3% of the lesser of them.

6.7.3 in the determination of hardness on the indentation depth of the depth of the imprint ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллюis determined by the indicator with a scale division of 1 mm.

6.7.4 For each imprint determines the number of hardness Brinell (HB) at the average value of its diameter, or its depth in accordance with annexes A and B, with rounding of the results of hardness values to an integer to print with a hardness of more than 100 units of HB and to one tenth for prints with hardness less than 100 HB.

7 Processing measurement results

7.1 the Value of hardness on the Brinell hardness is defined as the arithmetic mean of the hardness test results of six prints.

7.2 the hardness Value of each end of the sample is determined as the arithmetic mean of the results of measuring the hardness of three prints.

8 Allowable measurement uncertainty

8.1 discrepancies in the results of the three most distinguished parallel measurements of hardness at the ends of the specimen, the average hardness values of the upper and lower ends, the results of primary and re-definition of hardness of spongy titanium should not exceed the values given in table 1.


Table 1

         
Hardness range, unit NV Allowable discrepancy, the unit of NV

The limit of error of measurement ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллю, %

  the most distinct results of the three parallel hardness measurements
at the ends of the sample
average hardness values of the upper and lower ends of the sample results of primary and repeated hardness tests  
Up to 90 6
5 7 6
From 90 to 100 incl. 8
5 8 6
SV. 100 «110 « 8
5 10 8
«110» 120 « 8
6 13 10
«120» 130 « 9
6 18 14
«130» 150 « 11
6 20 16

8.2 In case of differences exceeding the values given in table 1, carry out hardness test on a sample made of a sample for re-testing.

9 qualifications


To perform analysis allowed the technician has qualifications not lower than 3rd level.

Annex a (mandatory). The dependence of hardness values on the Brinell hardness from the indentation diameter while the diameter of the ball D = 10 mm and a test load P = 14715 N (1500 kgf)

APPENDIX A
(required)


The dependence of hardness values on the Brinell hardness on the diameter of the imprint when the ball diameter ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллю10mm and test load ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллю14715 N (1500 kgf)



Table A. 1

                     

Indentation diameter ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллю, mm

0,00 0,01 0,02 0,03 0,04 0,05 0,06 0,07 0,08 0,09
2,50
301 298 296 294 291 289 287 284 282 280
2,60
278 276 273 271 269 267 265 263 261 259
2,70
257 255 253 251 250 248 246 Two hundred forty four 242 240
2,80
239 237 235 234 232 230 229 227 225 224
2,90
222 221 219 218 216 215 213 212 210 209
Of 3.00
207 206 205 203 202 200 199 198 196 195
3,10
194 193 191 190 189 188 186 185 184 183
3,20
182 180 179 178 177 176 175 174 173 172
3,30
170 169 168 167 166 165 164 163 162 161
3,40
160 159 158 157 156 156 155 154 153 152
3,50
151 150 149 148 147 147 146 145 144 143
3,60
142 142 141 140 139 138 138 137 136 135
3,70
135 134 133 132 132 131 130 129 129 128
3,80
127 127 126 125 125 124 123 123 122 121
3,90
121 120 119 119 118 117 117 116 116 115
Of 4.00
114 114 113 113 112 111 111 110 110 109
4,10
109 108 108 107 106 106 105 105 104 104
4,20
103 103 102 102 101 101 100 99,7 The 99.2 98,8
4,30
98,3 97,8 97,3 96,8 96,4 95.9 per 95,5 95,0 94,5 94,1
4,40
93,5 93,2 92,7 92,3 91,8 91,4 91,0 90,5 90,1 89,7
4,50
89,3 88,8 88,4 88,0 87,6 87,2 Up 86.8 86,4 86,0 85,6
4,60
85,2 84,8 For 84.4 84,0 83,6 83,3 82,9 82,5 82,1 81,8
4,70
81,4 81,0 80,7 80,3 79,9 79,6 79,2 78,9 78,5 The 78.2
4,80
77,8 77,5 77,1 76,8 76,4 76,1 75,8 75,4 75,1 74,8
4,90
74,4 74,1 73,8 73,5 73,2 72,8 72,5 72,2 71,9 71,6
5,00
71,3 71.0 per 70,7 70,4 70,1 69,8 69,5 69,2 68,9 68,6
5,10
68,3 68,0 67,7 67,4 67,1 66,9 66,6 66,3 66,0 65,8
5,20
65,5 65,2 64,9 64,7 64,4 64,1 63,9 63,6 63,3 63,1
5,30
62,8 62.6 per 62,3 62,1 The 61.8 61,5 61,3 61,0 60,8 60,6
5,40
60,3 60,1 59,8 59,6 59,3 59,1 58.9 per 58,6 58,4 58,2
5,50
57,9 57,7 57,4 57,2 57,0 56,8 56,6 56,3 56,1 55,9
5,60
55,7 55,5 55,2 55,0 54,8 54,6 54,4 54,2 54,0 53,7
5,70
53,5 53,3 53,1 52,9 52,7 52,5 52,3 52,1 51,9 51,7
5,80
51,5 51,3 51,1 50,9 50,7 50,5 50,3 50,2 50,0 49,8
5,90
49,6 49,4 49,2 49,0 48,8 48,7 48,5 48,3 48,1 47,8
6,00
47,7                  

APPENDIX B (mandatory). The dependence of hardness values on the Brinell hardness from the depth of the imprint when the ball diameter D = 10 mm and a test load P = 14715 N (1500 kgf)

APPENDIX B
(required)


The dependence of hardness values on the Brinell hardness from the depth of the imprint when the ball diameter ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллю10mm and test load ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллю14715 N (1500 kgf)



Table B. 1

                     

The depth of the imprint ГОСТ 30311-96 Титан губчатый. Метод определения твердости по Бринеллю, mm

0,000 0,001 0,002 0,003 0,004 0,005 0,006 0,007 0,008 0,009
0,15
249 248 246 245 243 242 240 239 238 238
0,16
235 234 232 231 230 228 227 226 225 223
0,17
222 221 220 219 218 217 215 214 213 212
0,18
211 210 209 208 207 206 205 204 203 202
0,19
201 200 199 198 197 196 196 195 194 193
0,20
192 191 190 189 189 188 187 186 185 185
0,21
184 183 182 182 181 180 179 179 178 177
0,22
176 176 175 174 174 173 172 172 171 170
0,23
170 169 168 168 167 166 166 165 165 164
0,24
163 163 162 162 161 161 160 159 159 158
0,25
158 157 157 156 156 155 155 154 153 153
0,26
152 152 151 151 150 150 149 149 149 148
0,27
148 147 147 146 146 145 145 144 144 143
0,28
143 143 142 142 141 141 140 140 140 139
0,29
139 138 138 138 137 137 136 136 136 135
0,30
135 135 134 134 133 133 133 132 132 132
0,31
131 131 130 130 130 129 129 129 128 128
0,32
128 127 127 127 126 126 126 125 125 125
0,33
124 124 124 124 123 123 123 122 122 122
0,34
121 121 121 121 120 120 120 119 119 119
0,35
119 118 118 118 117 117 117 117 116 116
0,36
116 116 115 115 115 115 114 114 114 114
0,37
113 113 113 113 112 112 112 112 111 111
0,38
111 111 110 110 110 110 109 109 109 109
0,39
109 108 108 108 108 107 107 107 107 107
0,40
106 106 106 106 105 105 105 105 105 104
0,41
104 104 104 104 103 103 103 103 103 102
0,42
102 102 102 102 101 101 101 101 101 101
0,43
100 100 100 99,8 99,6 99,4 The 99.2 99,0 98,9 98,7
0,44
98,5 98,3 98,2 98,0 97,8 97,6 97,5 97,3 97.1 the 96,9
0,45
96,8 96,6 96,4 96,3 96,1 95.9 per 95,8 95,6 95,4 95,3
0,46
95,1 95,0 94,8 94,6 94,5 94,3 94,2 94,0 93,8 93,7
0,47
93,5 93,4 93,2 93,1 92,9 92,8 92,6 92,5 92,3 92,2
0,48
92,0 91.9 per 91,7 91,6 91,4 91,3 91,1 91,0 90,8 90,7
0,49
90,6 90,4 90,3 90,1 90,0 89,9 89,7 89,6 89,4 89,3
0,50
89,2 89,0 88,9 88,8 88,6 88,5 88,3 88,2 88,1 Of 87.9
0,51
87,8 87,7 87,6 87,4 87,3 87,2 87,0 Of 86.9 Up 86.8 86,6
0,52
86,5 86,4 86,3 86,1 86,0 85,9 85,8 85,6 85,5 85,4
0,53
85,3 85,2 85,0 84,9 84,8 For 84.7 84,6 For 84.4 84,3 84,2
0,54
84,1 84,0 83,8 83,7 83,6 83,5 83,4 83,3 83,2 83,0
0,55
82,9 82,8 82,7 82,6 82,5 82,4 82,3 82,1 82,0 81,9
0,56
81,8 81,7 81,6 81,5 81,4 81,3 81,2 Of 81.1 80,9 80,8
0,57
80,7 80,6 80,5 80,4 80,3 80,2 80,1 80,0 79,9 79,8
0,58
79,7 79,6 79,5 79,4 79,3 79,2 79,1 79,0 78,9 78,8
0,59
78,7 78,6 78,5 78,4 78,3 The 78.2 78,1 78,0 77,9 77,8