GOST 30311-96

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  ГОСТ 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:

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 according 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 (293) 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 is 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 and measure in two mutually perpendicular directions. The diameter of the print is 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 is 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

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 10mm and test load 14715 N (1500 kgf)

Table A. 1

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 10mm and test load 14715 N (1500 kgf)

Table B. 1