GOST 23780-96

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  ГОСТ 23780-96

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

GOST 23780−96

Group B59

INTERSTATE STANDARD

TITANIUM SPONGE

Methods of sampling and sample preparation

Sponge titanium.
Methods of sampling and preparation of samples

ISS 77.120
AXTU 1809

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 and the State Institute of titanium and magnesium (Russia)

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 23780−96 introduced directly as state standard of the Russian Federation from July 1, 2000.

4 REPLACE GOST 23780−79

1 Scope

This standard establishes the methods of sampling and sample preparation for quality control of titanium sponge made in the form of lumps of irregular shape and scattered into fractions or in the form of briquettes according to GOST 17746.

2 Normative references

The present standard features references to the following standards:

GOST 9853.1−96 Titan spongy. Method for determination of nitrogen

GOST 9853.2−96 Titan spongy. Method for determination of iron

GOST 9853.3−96 Titan spongy. Methods for determination of carbon

GOST 9853.4−96 Titan spongy. Methods of determination of chlorine

GOST 9853.5−96 Titan spongy. Methods for determination of oxygen

GOST 9853.7−96 Titan spongy. Method for the determination of aluminium

GOST 9853.9−96 Titan spongy. Method for determination of silicon

GOST 9853.10−96 Titan spongy. Method of determination of niobium and tantalum

GOST 9853.11−96 Titan spongy. Method for determination of copper

GOST 9853.12−96 Titan spongy. Method for the determination of zirconium

GOST 9853.13−96 Titan spongy. Method for determination of tin

GOST 9853.14−96 Titan spongy. Method for determination of magnesium

GOST 9853.15−96 Titan spongy. Method for the determination of molybdenum

GOST 9853.16−96 Titan spongy. Method for the determination of tungsten

GOST 9853.17−96 Titan spongy. Method for the determination of palladium

GOST 9853.18−96 Titan spongy. Method of determination of manganese

GOST 9853.19−96 Titan spongy. Method for the determination of chromium

GOST 9853.20−96 Titan spongy. Method for the determination of vanadium

GOST 9853.21−96 Titan spongy. Methods for determination of hydrogen

GOST 9853.22−96 Titan spongy. Methods for determination of Nickel

GOST 9853.23−96 Titan spongy. Spectral method for determination of silicon, iron, Nickel

GOST 9853.24−96 Titan spongy. Spectral method of determination of vanadium, manganese, chromium, copper, zirconium, aluminium, molybdenum, tin, magnesium and tungsten

GOST 10354−82 polyethylene Film. Specifications

GOST 17746−96 spongy Titanium. Specifications

GOST 18300−87 ethyl rectified technical. Specifications

GOST 23782−96 spongy Titanium. The method of determining the fractional composition

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

3 Definitions

In this standard use the following terms with respective definitions:

3.1 supervised party: Part of homogeneous products, subject to compliance with the requirements.

3.2 sample point: part of the controlled party, at a time selected from a stream of lump of titanium sponge.

3.3 packaging unit of the party: part of the controlled party, Packed in containers of the established sample.

3.4 the composite sample: a Sample obtained by combining spot samples and used for the manufacture of medium samples.

3.5 average sample: the Part of the United sample received by its reduction. It is used for preparation of laboratory samples.

3.6 screen sample: the Part of the United sample used to determine the fractional composition.

3.7 laboratory test: part of an average sample used for the manufacture of preforms or directly analytical samples.

3.8 analytical sample: a Part of laboratory samples intended for analysis and the resulting processing chip form or compact the sample.

3.9 laboratory reserve sample: One of the test samples to be stored for the period of analysis.

3.10 consumable electrode: Sample, obtained by pressing of one of the laboratory tests and is intended to produce a test ingot.

3.11 trial ingot: The ingot obtained by melting the consumable electrode and used after machining for the manufacture of the chip and the workpiece.

3.12 the workpiece: Cast or extruded part of the laboratory sample. Designed for chips or compact model.

3.13 sample: Analytical sample, obtained by mechanical treatment of the cast workpiece to a certain shape and size. Designed for measuring hardness by the Brinell method and mass fraction of impurities.

3.14 chips: the Analytical sample is obtained by drilling or turning of the workpiece. Designed to determine the mass fraction of impurities chemical methods.

4 Prepare for sampling. General provisions

4.1 Used in the selection and preparation of sampling equipment, tools and packaging materials must be made of materials that prevent rubbing with a contamination of the samples of titanium sponge.

4.2 All surfaces, equipment and tools that come into contact with samples must be clean. Contact surfaces and samples are rubbed or washed with ethanol (ethyl alcohol) according to GOST 18300.

4.3 Analytical sample in the form of chips manufactured on a lathe or drilling machines with cutting speed 8−300 mm/s and rotational speed is 2.4−2.5without the use of coolants. Chips should not have any traces of oxidation.

The chips are crushed to the linear sizes no more than 3 mm. allowed linear chip size of 5 mm at a thickness of 1 mm.

4.3.1 Chips for analysis are selected after a preliminary grinding or drilling of the workpiece at a depth of 6 mm from the surface.

5 Selection and preparation of samples from the batches of titanium sponge in the form of lumps

5.1 Obtaining the joint sample

5.1.1 United trial from a controlled batch of titanium sponge type from spot samples, manual or automatic sampler.

The composite sample shall be not less than 10% of the mass of the controlled party.

The joint breakdown could be the whole mass of spongy titanium, one or more packing units of the party, if their weight is not less than 10% of the batch weight.

The scheme of sampling and preparation of samples from the batches of titanium sponge in the form of lumps given in Appendix A.

5.1.2 For control of the party (except for the brand TG-TV) to the absence of foreign objects, mechanical impurities and lumps of titanium sponge with defects used United sample or any packaging unit of the party.

5.2 Obtaining average samples

5.2.1 Average sample is obtained by combined reduction of the sample by passing it through a slotted divider to the mass of not less than 8 kg.

5.2.2 the Remainder of the combined sample (sieve test) is used to control the fractional composition of a batch of titanium sponge (except for the brand TG-TV) according to GOST 23782.

5.3 Obtaining laboratory samples

5.3.1 For parties of titanium sponge in the form of lumps of size more than 12 mm laboratory sample receive only one medium crushing of samples to a particle size less than 12 mm pieces and then dividing it into four parts, for example, the slot divider.

5.3.2 For parties of titanium sponge in the form of lumps of size less than 12 mm laboratory sample is obtained by dividing the average sample into four parts, for example, the slot divider.

5.3.3 Mass of laboratory sample should be not less than 2 kg.

5.3.4 Laboratory samples intended for the consumer and re-determining, and a backup sample pack each separately in a package of polyethylene film according to GOST 10354 and mark.

The shelf life of the samples for repeated definitions established by agreement with the consumer, but not more than 6 months.

5.4 Receipt of analytical samples

5.4.1 Laboratory a sample from the batches of titanium sponge (except TG-TV) is divided into two parts: weight less than 0.5 kg less than 1.5 kg. Part of laboratory sample weight less than 0.5 kg are sent for manufacturing molded preform, the second part weighing at least 1.5 kg for the manufacture of consumable electrode and melting him from the trial of the ingot.

5.4.2 Laboratory a sample of titanium sponge stamps TG-TV is subjected to reduction and is directed to the manufacture of pressed blanks weighing not less than 0.5 kg.

5.4.3 Molded workpiece and the consumable electrode must be made in the form of cylinders with a diameter of 40 to 60 mm when a pressing force not less than the 33.4 kN (3400 kg).

Pressing lead portions. The portions for pressing at least eight getting on the slot divider.

5.4.4 From the molded workpiece in accordance with 4.3 get analytical sample in the form of chips.

The mass of the chip should be not less than 0.05 kg.

The chip is exposed to the permanent magnet and remove tramp iron particles of the cutting tool.

5.4.5 Analytical sample from the batches of titanium sponge (except TG-TV) is placed in the package of polyethylene film according to GOST 10354, marked, tightly closed and directed to the definition of regulated GOST 17746 impurities of chlorine GOST 9853.4 and unregulated contaminants hydrogen according to GOST 9853.21 and magnesium — according to GOST 9853.14.

The analytical sample from the batches of titanium sponge stamps TG-TV package, label and direct determination of mass fractions of impurities of nitrogen, iron, carbon and chlorine by chemical methods.

5.4.6 From the consumable electrode in a vacuum arc furnace to produce a test ingot with a diameter of (65±5) mm wide and (80±5) mm. of Residual pressure in a furnace before smelting trial of the ingot is not more than 1.33 PA (10 µm RT.St.), leakage — not more than 0,325 PA/(l·s) (2.5 µm RT.St./(l·s), the pressure in the furnace during the melting is not more than 13.3 PA (100 microns Hg.St.).

5.4.7 Lateral grind test ingot on a lathe to remove the shells and then to a depth of not less than 5 mm. Gating test part of the ingot butt to remove the shrink holes to a depth of not less than 20 mm. From the bottom of the cut off layer with a minimum thickness of 15 mm.

5.4.8 From the bottom of the processed ingot is cut off the workpiece height (40±1) mm (a diameter of not less than 45 mm) for the manufacture of sample for determination of hardness and a mass fraction of impurities spectral method.

5.4.9 Sample is subjected to finish machining of the ends in accordance with GOST 30311.

The sample is marked and Packed in a plastic bag.

On the prepared sample is carried out hardness test on Brinell hardness according to GOST 30311 and mass fraction regulated by GOST 17746 impurity spectral methods: iron, Nickel and silicon GOST 9853.23 and unregulated contaminants vanadium, manganese, chromium, copper, zirconium, aluminium, molybdenum, tin, magnesium and tungsten — GOST 9853.24.

5.4.10 Analytical sample in the form of chips for the determination of impurities chemical methods to get turning of the sample after the determination of hardness and impurities by spectral methods. Turning of the sample is carried out along the entire cross section of the ingot. Receiving chips store in accordance with 4.3.

Chips total weight of not less than 0.05 kg is subjected to magnetic cleaning, Packed and labelled.

Chips are used to determine the chemical methods mass fraction regulated by GOST 17746 impurities: nitrogen — GOST 9853.1, Nickel — GOST 9853.22, iron — GOST 9853.2, carbon — GOST 9853.3, silicon — GOST 9853.9 and unregulated contaminants: 9853.7 GOST, GOST 9853.10 — GOST 9853.21.

5.4.11 remaining after preparation of the chip sample parts prepare samples for the determination of oxygen impurity.

In the application of neutron activation method for the determination of oxygen grind the sample in the form of a cylinder geometric dimensions corresponding to dimensions of the reference samples by neutron-activation facilities.

When using the method of reductive melting in a stream of inert carrier gas grind the sample in the form of a cylinder with a mass of 0.1 g.

Preparation of samples and determination of the mass fraction of oxygen impurity are according to GOST 9853.5.

Prepared samples were Packed in plastic bags and labeled.

6 Selection and preparation of samples from the batches of titanium sponge stamps TG-TV briquettes

6.1 the Combined sample from the batches of titanium sponge in the form of briquettes obtained by combining pellets, selected at random, one from each packaging unit of the party.

The scheme of sampling and preparation of samples from the batches of titanium sponge in the briquettes is given in Annex B.

6.2 Average sample from the batch briquettes are produced by drilling or removal of chips from each briquette, which is part of United sample. The weight of the chips obtained from each briquette should be less than the mass of the briquette. If necessary, a sample cut on the slot divider.

Receiving chips store in accordance with 4.3.

An average sample is subjected to magnetic cleaning.

The average weight of the sample should be not less than 0.5 kg.

6.3 Laboratory sample is obtained by dividing the average sample into four parts, for example, the slot divider.

The mass of laboratory samples shall be not less than 0.125 kg.

6.3.1 Laboratory samples intended for the consumer and re-definitions, and a backup trial pack each separately in a plastic bag and labeled.

6.3.2 One of the test samples is reduced to a mass of at least 0.05 kg and as an analytical sample is directed to the determination of mass fraction GOST 17746 regulated impurities of nitrogen, iron, carbon, and chlorine chemical methods in accordance with GOST 9853.1 — GOST 9853.4.

Annex a (informative). THE SCHEME OF SAMPLING AND PREPARATION OF SAMPLES FROM THE BATCHES OF TITANIUM SPONGE IN THE FORM OF LUMPS

APPENDIX A
(reference)

ANNEX B (reference). THE SCHEME OF SAMPLING AND PREPARATION OF SAMPLES FROM THE BATCHES OF TITANIUM SPONGE BRIQUETTES

APPENDIX B
(reference)