Steel

 

(57) Abstract:

The invention relates to metallurgy, namely steel, working in conditions of detergents and steriliza environments. The introduction of the new steel components together with components of known composition will improve the corrosion resistance of the material in aggressive environments. Therefore, it is proposed steel of the following composition, wt.%: carbon 0,70 - 0,85; manganese 0,80 - 1,0; chrome 15,0 - 16,5; silicon 0,20 - 0,35; vanadium 0,20 - 0,26; molybdenum 0,75 - 0,85; aluminum of 0.05 - 0.10; tungsten 0,01 - 0,02; copper 0,01 - 0,20; calcium 0,02 - 0,04; magnesium 0,03 - 0,06; iron rest. table 1.

The invention relates to metallurgy, namely stainless steel, working in conditions that increase the possibility of corrosion. The basic requirement applicable to steels, the preservation of corrosion resistance in various environments, prolonged periods of operation under given conditions.

Known steel of the following chemical composition; wt.%:

Carbon - 0,15 - 0,25

Manganese - 0,20 - 0,80

Silicon - 0,15 - 0,50

Chrome - 12,0 - 14,0

Vanadium - 0,10 - 0,27

Nitrogen - 0,025 - 0,065

Calcium - 0,005 - 0,050

Iron - Rest

when the ratio V/N 4 - 4,2.

The disadvantage of this steel is neither the high corrosion resistance to cleaning and sterilizing environments.

The goal is achieved in that a steel containing carbon, manganese, silicon, chromium, vanadium, calcium, iron, impose additional molybdenum, aluminum, tungsten, copper, magnesium in the following ratio, wt.%:

Carbon - 0,70 - 0,85

Manganese - 0,80 - 1,0

Silicon - 0,20 - 0,60

Chrome - 15,0 - 16,5

Vanadium - 0,20 - 0,25

Molybdenum - 0,75 - 0,85

Aluminum - 0,05 - 0,10

Tungsten - 0,01 - 0,02

Copper - 0,01 - 0,20

Calcium - 0,02 - 0,04

Magnesium - 0,03 - 0,06

Iron and impurities - Rest

The introduction of new components in the composition of steel together with components of known composition will improve the corrosion resistance in cleaning and sterilizing environments. The choice of elements for alloying steel grade selected was determined by the required properties and cost.

The minimum carbon content is 0.70 wt.% provides reception of predetermined hardness and a maximum of 0.85 wt.% is introduced to maintain a high corrosion resistance.

The minimum manganese content of 0.80 wt.% selected from conditions ensure raskalennoi steel, and a maximum of 1.0 wt.% - to increase the hardenability of steel.

The minimum chromium content of 15.0 wt.% is introduced to obtain a high q brittle carbides and other phases.

The silicon in the amount of 0.20 wt.% introduced to ensure active deoxidizer of steel, the maximum number of silicon to 0.60 wt.% - to reduce the sensitivity of the steel to overheat.

Vanadium in a minimal amount of 0.20 wt.% facilitates the grinding of grain, and in a maximum of 0.25 wt.% - to avoid the formation of special carbides.

Molybdenum in a minimal amount of 0.75 wt.% chosen to provide the required corrosion resistance, maximum of 0.85 wt.% - to improve toughness and reduce sensitivity to temper embrittlement.

Aluminum in a minimal amount of 0.05 wt.% provides full recyclenet steel and obtaining fine patterns, and a maximum of 0.1 wt. % - to ensure that no precipitation hardening and embrittlement.

Tungsten in a minimal amount of 0.01 wt.% introduced to ensure opustoshennosti, in the maximum amount of 0.02 wt.% - to stabilize the technology of thermal processing.

Copper in a minimal amount of 0.01 wt.% introduced to ensure corrosion resistance, maximum of 0.02 wt.% - to ensure that no precipitation hardening.

Calcium in minimality fluidity.

Magnesium in a minimum amount of 0.03 wt.% selected to ensure melkodisperstnoy non-metallic inclusions, a maximum of 0.06 wt. % - to avoid graphitization process.

Example. Known and estimated compositions of the steels were melted in an induction furnace EAST 16 and poured into the mold 100 kg ingots was reforged in the plate, which was tested in a concentrated solution of soap, washing powder, 10% aqueous solution of acetic acid. The test was carried out at 50 - 60oC. the Results are presented in the table.

Steel containing carbon, manganese, silicon, chromium, vanadium, calcium, iron, characterized in that it further added molybdenum, aluminum, tungsten, copper, magnesium in the following ratio, wt.%:

Carbon - 0,70 - 0,85

Manganese - 0,80 - 1,00

Silicon - 0,20 - 0,60

Chrome - 15,0 - 16,5

Vanadium - 0,20 - 0,25

Molybdenum - 0,75 - 0,85

Aluminum - 0,05 - 0,10

Tungsten - 0,01 - 0,02

Copper - 0,01 - 0,20

Calcium - 0,02 - 0,04

Magnesium - 0,03 - 0,06

Iron - Rest

 

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