Iron-based cold-resistant alloy

FIELD: metalwork operating in cold climates at static loads.

SUBSTANCE: proposed iron-based cold-resistant alloy includes the following components, mass-%: titanium, 1-2; carbon, 0.009 max; silicon, 0.1 max; aluminum, 0.003 max; copper, 0.03 max; nickel, 0.2 max; the remainder being iron. Proposed alloy possesses high strength at retained ductility; embrittlement of this alloy at cooling to temperature below minus 78°C is excluded; content of carbon is considerably reduced due to increased content of titanium, thus enhancing resistance to cold.

EFFECT: enhanced efficiency; enhanced cold resistance.

1 dwg, 1 tbl

 

The invention relates to metallurgy, and more specifically to the development of alloys for fabrication of structural steel, designed for operation in conditions of cold climate when static loads.

Known prototype of the invention, the set of attributes (strength, manufacturability, gladstonos) is hot-rolled carbon steel of ordinary quality VST (GOST 380-71), which is widely used for the manufacture of welded steel structures, suitable for use up to temperatures of minus 20°C.

Chemical composition and mechanical properties of steel Ust ordinary quality are listed in table

Table
S, % massMn, % massTemporary resistance δg, MPaYield strength δt, MPaElongation δ, %
0,140,40-0,65380-490At least 250At least 27

The invention consists in the development of alloy, which is not embrittled by cooling to a temperature of minus 78°i.e. 58°lower limit for steel VST, and has mechanical properties and technological quality not lower than the steel.

Gladston the nd-based alloy of iron, containing carbon, silicon, titanium, additionally contains aluminum, copper and Nickel in the following ratio, wt.%: titanium 1-2; carbon not more than 0,009; silicon is not more than 0.1; aluminum is not more than 0,003; copper not more than 0,03; Nickel not more than 0.1 and iron rest.

The alloy is a solid solution of titanium in iron. Thanks to the titanium content of carbon in the alloy is significantly reduced, which provides gladstonos. The second role titanium - hardening of iron while maintaining ductility.

The titanium content in the alloy can be varied from 1 to 2 wt.%. In the alloy is allowed impurities of carbon, silicon, aluminum, copper and Nickel.

The mechanical properties of the alloy are given in the graphs. Tensile strength and conditional yield stress increase with increasing titanium content. Elongation decreases, and impact strength KCU does not change with increasing titanium content; those characteristics remain at a high level.

Elongation at a temperature of minus 78°has the same meaning as at a temperature of + 20°for the alloy of appropriate composition.

Alloys of Fe-Ti containing different concentrations of titanium (from 1 to 2 wt.%), were obtained on the basis of iron Armko in a high frequency melting furnace in air. For doping was applied to the titanium sponge stamps TG-Acting Ingots were gomogenizirovannykh for 20 caspri temperature 1200° C. Hot rolling of them were obtained rods with a diameter of 8 mm and the rod section 16×16 mm2. Of the rods were made of the samples for the tensile test, and bar - samples for the determination of toughness.

Received quality welds on the blanks of alloy Fe - 1.32 wt.% Ti TIG method with additive of steel HIT.

Based on the above, we can assume that the resulting alloy has the structural strength and ductility at temperatures up to 78°C operating conditions at a static load.

Cold-resistant alloy based on iron containing carbon, silicon, titanium and iron, characterized in that it additionally contains aluminum, copper and Nickel in the following ratio, wt.%:

titanium1 - 2
carbonno more 0,009
siliconnot more than 0.1
aluminumno more than 0,003
coppernot more than 0,03
Nickelnot more than 0.1
ironthe rest of it.



 

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1tbl, 1 ex

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2 tbl, 1 ex

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5 cl, 1 ex, 1 dwg

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