Installation for the heat treatment of steel in coils

 

(57) Abstract:

The invention relates to equipment for thermal processing of metals and alloys and can be preferably used for annealing, normalizing calibrated steel from mikrotechna temperature range (MCI) and thermolysine (quenching and tempering) calibrated steel, intended for the manufacture of high-strength fasteners by the method of cold forming processes (GHOSH). The basis of the invention is tasked simplify the design lines with improved performance characteristics and improve the quality of the processed metal. The problem is solved by the fact that in order to simplify the design of the line is fixed filler, as when using the original calibrated metal the need for it disappears. The presence behind the inductor vacation sprayer will also help if necessary cyclic heat treatment with two austenization, and also provides a winding in a riot of cold metal. The presence of a pushing device located immediately before the inductor vacation, simplifies the feeding wire before each start line and ensures the safety of the inductor. This layout set is the Kalka vacation) without significant changes. 1 Il.

The invention relates to equipment for thermal processing of metals and alloys and can be preferably used for annealing, normalizing, hardening calibrated steel from mikrotechna temperature range (MCI) and thermolysine (quenching and tempering) calibrated steel, intended for the manufacture of high-strength fasteners by the method of cold forming processes (GHOSH).

The hardening of the MCI provides heating in microtechno temperature range followed by rapid cooling of the steel, and to ensure the stability properties you need precise temperature mode.

A known technology for recrystallization-spheroidizing annealing with partial phase recrystallization involving heating above Ac1and subsequent slow (0,05 - 0,5oC/s) cooling. The advantage of this technology is significantly shorter duration of heat treatment compared with the treatment in the furnace cover. Currently known technological solutions, providing two-phase territorality structure cavallotti properties. Similar drawbacks and to thermolysine riots calibrated steel for hardening and tempering in chamber furnaces.

Know the use of induction heating in lines for heat treatment of wire, for example in installations for induction heating wire [1 and 2] .

The closest is essentially an installation for the heat treatment of calibrated steel containing uncoiling device, right-pushing device, the heating unit and cooling coil vacation and smachiwausa device [3].

The disadvantage of this equipment is the presence of the die set after uncoiling device properly before-pushing device, which complicates the design of the line and when I use the original calibrated became absolutely useless, and the absence of the clamping device between the heating unit and cooling coil vacation complicates the feeding wire at each start-up and leads to frequent failure of the inductor vacation. The absence of the possibility of accelerated cooling after the inductor vacation leads to the need to pull up in revolt hot metal that is impractical because it leads to non-uniform cooling of the Lena task simplify the design lines with improved performance characteristics and improve the quality of the processed metal.

The problem is solved by the fact that in order to simplify the design of the line is fixed filler, as when using the original calibrated metal the need for it disappears. The presence behind the inductor vacation sprayer will also help if necessary cyclic heat treatment with two austenization, and also provides a winding in a riot of cold metal. The presence of a pushing device located immediately before the inductor vacation, simplifies the feeding wire before each start line and ensures the safety of the inductor. This arrangement of the plant gives it versatility and allows for various types of heat treatment (annealing, normalizing, hardening, tempering) without substantial changes.

The drawing shows a General view of the installation, where 1 - unwinding device, 2 - correctly-pushing device, block heating and cooling (consisting of inductor 3 and the cooling device 4), 5 - pushing device, 6-inductor vacation, 7 - sprayer and smachiwausa device - 8.

The device operates as follows. With the unwinding device 1 rod enters the right-pushing device 2, then passes through blication-spheroidizing annealing the rod slowly cooled to a temperature of about 550oC, and in the case of hardening of the MKI is cooled by water. Further, the rod enters the pushing device 5 and then in the inductor vacation 6, which provides either heating in the austenitic region (in the case of cyclic processing), or heating to T<(in the case of a holiday). Next, the rod is fed into the sprayer 7 where it is cooled to room temperature, and then smachiwausa device 8, where in the case of annealing provided the required conditions cooling.

The introduction of the proposed installation for spheroidizing annealing, hardening of the MKI and improve calibrated steel will abandon low bell-type furnaces, currently used for annealing and hardening of steel before the cold by forging, will improve the quality of heat-treated steel and will significantly improve the conditions.

Sources of information

1. USSR author's certificate N 544685, class C 21 D 1/10, 1974.

2. USSR author's certificate N 899674, class C 21 D 1/10, 1984.

3. RF patent N 2070582 class. C 21 D 1/32, 9/60 from 20.12.96 bull. N 35K

Installation for the heat treatment of steel in coils, containing the unwinding device, right-pushing device, a heating unit and a cooling gap is Le inductor leave the sprayer, and between the heating unit and cooling coil - pusher device, with properly-pushing device is located directly after the unwinding device.

 

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EFFECT: lowered lengthwise thickness difference of tubes.

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EFFECT: ensured optimal conditions for cold die forging of high-strength geometrically complex fastening members and simultaneously improved steel hardenability characteristics.

FIELD: ferrous metallurgy.

SUBSTANCE: invention provides round-profiled iron smelted from steel containing carbon and alloying elements, having specified parameters of metallurgical quality, structure, mechanical properties, hardenability, and in-process plasticity and characterized by being composed of, wt %: carbon 0.17-0.25, manganese 0.90-1.40, silicon 0.01-0.17, sulfur 0.005-0.020, chromium 0.001-0.35, vanadium 0.001-0.07, nickel 0.001-0.10, copper 0.001-0.10, molybdenum 0.001-0.10, titanium 0.01-0.04, boron 0.0005-0.0050, calcium 0.001-0.010, iron and unavoidable impurities - the balance. When following relationships are fulfilled: 22 ≤ 12/C-Mn/0.055 ≤ 47Ni/10Ti+Al ≤ 0.039; 10B-0.01C/N ≥ 1.80, rolled iron has following characteristics: maximum degree of pollution with nonmetal inclusions, in particular sulfides, oxides, silicates, and nitrides, does not exceed 3 points for each type of inclusions; longitudinally uniform spheroidized structure composed of at least 80% perlite; effective grain size 5-10 points; diameter of wire 10-25 mm; carbon-free layer not exceeding 1.5% diameter; cold setting value at least 1/3 height; throughout (90%) hardenability in circles up to 19 mm in diameter; point of maximum load not higher than 580 MPa; relative elongation at least 18%; and relative contraction at least 60%.

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FIELD: ferrous metallurgy.

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