GOST 16773-2003

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  ГОСТ 16773-2003

GOST 16773−2003 (ISO 5453:1980) Ferroniobium. Technical requirements and delivery conditions

GOST 16773−2003
(ISO 5453:1980)

Group B09

INTERSTATE STANDARD

FERRONIOBIUM

Technical requirements and delivery conditions

Ferroniobium. Technical requirements and conditions of delivery

ISS 77.100
OKP 08 6100

Date of introduction 2004−09−01

Preface

1 DEVELOPED by the Russian Federation, Technical Committee for standardization TC 8 «ferroalloys"

INTRODUCED by Gosstandart of Russia

2 ADOPTED by the Interstate Council for standardization, Metrology and certification (Protocol No. 23 dated 22 may 2003)

Was standards Bureau MGS N 4456

The adoption voted:

3 this standard is modified in relation to the international standard ISO 5453:1980 «Ferroniobium. Technical requirements and delivery conditions». Additional provisions tailored to the needs of national economy the above States are shown in italics

4 Resolution of the State Committee of the Russian Federation for standardization and Metrology, January, 28th, 2004 N 37th St interstate standard GOST 16773−2003 introduced directly as a national standard of the Russian Federation from September 1, 2004

5 REPLACE GOST 16773−85

AMENDED, published in IMS No. 2, 2005

The amendment introduced by the legal Bureau «Code»

1 Scope

This standard specifies the technical requirements and defines the terms of delivery ferroniobium used in steelmaking and foundry industry, and for the production of electrode coatings.

Additional requirements that reflect the needs of the economy, highlighted in italics.

2 Normative references

The present standard features references to the following standards:

GOST 12.1.005−88 standards System of labor safety. General hygiene requirements for working zone air

GOST 12.1.007−76 System of standards of occupational safety. Harmful substances. Classification and General safety requirements

GOST 12.1.044−89 (ISO 4589−84) System of occupational safety standards. Fire and explosion hazard of substances and materials. Nomenclature of indices and methods of their definition

GOST 12.4.011−89 System safety standards. Means of protection of workers. General requirements and classification

GOST 15933.3−90 Ferroniobium. Method of determination of phosphorus

GOST 15933.4−90 Ferroniobium. Method for determination of silicon

GOST 15933.5−90 Ferroniobium. The method of determining the amount of niobium and tantalum

GOST 15933.6−90 Ferroniobium. Method for the determination of tantalum

GOST 15933.7−90 Ferroniobium. Method for the determination of aluminium

GOST 15933.8−90 Ferroniobium. Method of determining titanium

GOST 15933.11−70 Ferroniobium. Method for determination of nitrogen content

GOST 15933.12−70 Ferroniobium. Method for determination of cobalt

GOST 15933.13−70 Ferroniobium. Method for determination of bismuth

GOST 15933.14−70 Ferroniobium. Method for determination of tin content

GOST 15933.15−70 Ferroniobium. Method for the determination of arsenic content

GOST 15933.16−70 Ferroniobium. Method for determination of antimony

GOST 15933.17−70 Ferroniobium. Method for the determination of zinc content

GOST 15933.18−70 Ferroniobium. Method for determination of lead content

GOST 17260−87 ferroalloys, chromium and manganese metal. General requirements to selection and preparation of samples for chemical analysis

GOST 20515−75 Ferroniobium aluminothermic. Method of sampling and preparation of samples for chemical analysis

GOST 22310−93 (ISO 4551−87) ferro-alloys. Method of determination of granulometric composition

GOST 26590−85 ferro-alloys. Packing, marking, transportation and storage

GOST 27041−86 ferroalloys, chromium and manganese metal. Methods of determining sulphur

GOST 27069−86 ferroalloys, chromium and manganese metal. Methods for determination of carbon

3 Definitions

In this standard, use the following term with the appropriate definition:

ferroniobium: Alloying alloy of iron and niobium (sum of niobium and tantalum) with a minimum content of niobium (the amount of niobium and tantalum) 55% (40%) by weight and a maximum of 70% (65%) by mass, obtained by reduction.

4 ordering

Order ferroniobium should contain:

a) the number;

b) method of compiling party;

in) chemical composition or the brand in accordance with table 1 and (or) 1A;

d) the range of particle sizes (class size) in accordance with table 2 or that the range of particle sizes;

d) additional requirements for chemical composition, packaging, etc.

5 Technical requirements

5.1 Preparation of the party

Ferroniobium supply parties, compiled by one of the following methods:

5.1.1 Float method

The party, composed of a float method, consists of a mass melting of ferroniobium one (or one part of continuous smelting).

5.1.2 Podarochny method

The party, composed podarochny method consists of several melts (or parts of continuous melting) of ferroniobium one brand. The mass fraction of niobium (from theUmmah of niobium and tantalum) in a speedo (or parts of continuous trunks) constituting the consignment shall not differ by more than 3%.

5.1.3* Mixed method
_________________
* Recommended requirements.

The party, composed of the mixed method consists of several melts (or parts of continuous melting) of one ferroniobium brand, which is crushed to particle size less than 50 mm and thoroughly mixed.

The content of the base element in a speedo (or parts of continuous trunks) constituting the consignment may vary between the minimum and maximum limits established for this brand of ferroniobium.

5.2 Chemical composition

5.2.1 Brand and chemical composition of ferro-must meet table 1 and (or) table 1A*.
_________________
* Recommended requirements.

Table 1

Table 1A*
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* Recommended requirements.

End of table 1a

5.2.2 In tables 1 and 1A provided only the basic elements and usual impurities. At the request of the buyer with the consent of the supplier and the buyer establish narrower ranges of the content of basic elements and (or) other limits and (or) an unidentified elements.

5.3 Ranges of particle sizes

5.3.1 Ferroniobium is supplied in pieces or as crushed and screened particles. The ranges of particle sizes and tolerances shall be as specified in table 2.


Table 2

5.3.2 Mass undersize set for the point of delivery* material to the buyer. Set the size of the particles by sieving test sieve with stainless steel mesh — square mesh.
________________
* The point at which responsibility for delivery is transferred from the supplier to the buyer. If neither the supplier nor the buyer are not responsible for transportation, the item set by mutual agreement.

5.3.3 By mutual agreement of the supplier and the buyer establish the ranges of particle sizes and (or) tolerances other than that specified in table 2.

5.4 Surface contamination

5.4.1 Pieces of ferroniobium on the surface and in the fracture should not have a sharply expressed inclusions of slag or other foreign materials visible to naked eye.

6 security Requirements

6.1 Dust of ferroniobium in the degree of impact on the human body belongs to the 4th class of hazard according to [1] and GOST 12.1.007.

6.2 Dust of ferroniobium has a mild fibrogenic action. The maximum permissible concentration dust of ferroniobium in the air of working zone — 10,0 mg/min accordance with [1].

6.3 monitoring of the content of aerosol in the air of working zone is carried out periodically according to GOST 12.1.005 as for substances of the 4th class of danger according to the method of determination of harmful substances in the air, approved by the Ministry of health.

6.4 Dust of ferroniobium according to GOST 12.1.044 should be attributed to combustible substances.

It is expected that the lower concentration limit of flame propagation (LEL) for different brands depending on the content of tantalum, titanium and aluminum is in the range of 800−1500 g/m, the ignition temperature 1200 °C-1500 °C (in the layer and in suspension).

6.5 Means of collective and individual protection in accordance with GOST 12.4.011. In the presence of aerosol use respirators type «Petal» (when ambient temperature not above 40 °C).

6.6 Ferroniobium in pieces and crushed under the conditions of storage and transportation of non-toxic, non-flammable and pozharovzryvobezopasnost.

7 acceptance Rules

7.1 Ferroniobium take parties. The party must be issued a document about quality that contains:

— trademark or name of the manufacturer;

— grade ferroniobium and class size (chunk size);

— the batch number;

— chemical composition of the party;

— method of formation of the party;

weight gross and net;

— number of packages;

— date of manufacture;

— the stamp of the technical control Department;

— the designation of this standard.

7.2 sample size for the control of chemical composition and verify the absence of contaminants on the surface and in the fracture pieces — according to GOST 20515.

Of the absence of contaminants on the surface and in the fracture of the pieces performed on the samples without breaking off.

7.3 sample size for determination of granulometric composition — according to GOST 22310.

7.4 the Amount of niobium and tantalum, aluminum, silicon, titanium, carbon, and phosphorus determined in each batch.

Sulfur content is determined periodically on each 10th smelting and tantalum for each of the 50 th melting.

The content of cobalt, arsenic, tin, antimony, lead, zinc, bismuth, and nitrogen is determined by the requirement of the user.

7.5 Control of granulometric composition of ferroniobium from the manufacturer is carried out periodically at every 100-th melting.

7.6 If unsatisfactory test results of at least one indicator repeat tests are carried out at twice the sample selected from the same batch. The results of repeated tests are final.

8 Test

8.1 Testing provider

8.1.1 Sampling for chemical and sieve analyses

8.1.1.1 Sampling for chemical and sieve analyses carried out by the methods established in GOST 17260, 20515 GOST and GOST 22310, and other methods providing the same accuracy.

8.1.1.2 Sampling is usually carried out in the warehouse of the supplier, if no other arrangement. Where sampling is not carried out, the supplier and the buyer may be present.

8.1.2 Chemical analysis

8.1.2.1 Chemical analysis of ferroniobium is carried out by the methods established in GOST 15933.3-15933.8 GOST, GOST 15933.11-15933.18 GOST, GOST 27041, GOST 27069, or other methods providing the same accuracy.

8.1.2.2 the error of results of quantitative chemical analysis specified in the relevant standard methods of quantitative chemical analysis.

8.2 Testing the consumer

8.2.1 At the request of the consumer ferroniobium supply with the sample representing the party.

8.2.2 If necessary, the consumer conducts routine tests of chemical and granulometric composition of the party.

8.2.3 Sampling and control of granulometric composition of ferroniobium user spends GOST 22310 or by other methods providing the required accuracy of selection and identification.

8.2.4 Under the control of the chemical composition can be used two options:

1) the user performs analysis of samples submitted by the supplier together with the party;

2) the user conducts selection and analysis of samples in accordance with 8.1.1 and 8.1.2.

8.2.5 When carrying out control tests according to the first embodiment must satisfy the condition

, (1)

where — the value of the quality indicator according to the supplier;

— the results of a control analysis of a user;

— permissible difference between results of the two tests set out in standard methods of analysis.

8.2.6 When carrying out control tests according to the second embodiment should meet the following condition

, (2)

where is the total error of the quality control established in GOST 20515.

8.2.7 If the results of the control tests the condition (1) or (2), the batch quality is considered satisfactory, and the value of the quality indicator X can be updated according to the formula

. (3)

8.2.8 If the results of the control tests the condition (1) or (2) is not satisfied, the user can re-control or arbitration trials, unless otherwise agreed.

8.3 Arbitration trials

8.3.1 If necessary, the arbitration sampling is conducted by the arbitrator, selected by mutual agreement of the supplier and the consumer. Sampling is carried out by the methods established in GOST 17260, 20515 GOST and GOST 22310; at the mutual agreement of the supplier, the consumer and of the arbitrator to apply other methods that ensure the same precision.

The sample obtained during the arbitration selection process is accepted by both parties concerned.

8.3.2 the Arbitral analysis carried out by the methods established in GOST 15933.3-15933.8 GOST, GOST 15933.11-15933.18 GOST, GOST 22310, 27041 GOST, GOST 27069; at the mutual agreement of the supplier, the consumer and of the arbitrator to apply other methods that ensure the same precision.

The result obtained by the arbitrator considered final, unless otherwise agreed.

8.4 surface finish and fracture pieces of ferroniobium evaluated visually.

9 Packing, marking, transportation and storage

9.1 Packing, marking, transportation and storage — by GOST 26590 with the additions:

— ferroniobium transporterowych Packed in steel drums in covered wagons or special containers;

— drums with ferroniobium intended for long-term storage, should be painted in blue; for export gray.

9.2* Ferroniobium pack transporterowych and stored in accordance with international rules**.
_________________
* Recommended requirements.

** International rules, for example:

International rules on the transport of dangerous goods by rail (Annex b);

International rules on the transport of dangerous goods by sea;

European rules on the transport of dangerous goods by road.

Annex a (informative). Bibliography

APPENDIX A
(reference)

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* GN 2.2.5.1313−03 «Maximum permissible concentration (MPC) of harmful substances in the air of working zone». — Note the CODE.