Spheroidizing annealing process for medium carbon steel plate in bell furnace

A steel plate cover and steel plate technology, which is applied to the field of spheroidizing furnace annealing of medium carbon steel plates, namely No. 45 steel, can solve the problems of difficult to achieve pre-annealing process, low spheroidization qualification rate, difficulty in spheroidization, etc., and shorten the delivery time. Cycle time, improve mechanical properties, reduce the effect of production cost

Inactive Publication Date: 2008-11-19
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The national standard requires that the medium carbon steel plate can be shipped according to the spheroidized pearlite structure or the non-spheroidized pearlite structure. However, the plasticity and toughness of the medium carbon steel plate can be significantly improved after spheroidizing, which is convenient for machining and avoids stamping deformation and cracking. Therefore, the user requires that the medium-carbon steel plate must be delivered according to spheroidizing annealing, and the medium-carbon steel plate is a hypoeutectoid steel. Due to its low carbon content, there are few remaining undissolved carbon points in the austenite, and

Method used

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  • Spheroidizing annealing process for medium carbon steel plate in bell furnace
  • Spheroidizing annealing process for medium carbon steel plate in bell furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Pickling steel blank

[0033] At room temperature, wash off the scale of the hot-rolled billet on the surface of the steel plate with an external dimension of 5.6×1535×1250mm with hydrochloric acid in a tank-type pickling tank;

[0034] (2) Longitudinal rolling billet

[0035] The pickled steel billet is rolled by a four-roller 2300mm reversible cold rolling mill for 7-15 passes, and longitudinally rolled into a steel plate with an external dimension of 4.0×1200×2000mm, with a deformation of 28%. The upper roll: 0.03mm, bottom roller: 0mm;

[0036] (3) Annealing by stacking sheets

[0037] Put the cold-rolled steel plate into the hearth of the electric heating bell furnace, the furnace load is 40t, and then buckle the inner and outer covers;

[0038] a. The plate temperature thermocouple is used to control the temperature. There are three thermocouples inserted into the electric heating mantle furnace. The principle of temperature measurement is the same. From th...

Embodiment 2

[0047] (1) Pickling steel blank

[0048] At room temperature, use a tank-type pickling tank to wash off the scale of the hot-rolled blank on the surface of the steel plate with an overall size of 6.0×1440×1250mm with hydrochloric acid;

[0049] (2) Longitudinal rolling billet

[0050] The pickled steel slabs are rolled by a four-roller 2300mm reversible cold rolling mill for 7-15 passes.

[0051] Longitudinal rolling into a steel plate with an external dimension of 4.0×1200×2000mm, with a deformation of 33%, upper roll: 0.03mm, lower roll: 0mm;

[0052] (3) Annealing by stacking sheets

[0053]The steel plate after cold-rolling is packed into the hearth of electric heating bell-type furnace, and furnace charge is 60t, covers furnace cover then; a adopts plate temperature thermocouple to control temperature, and method is identical with embodiment one;

[0054] b. The heating in the bell-type furnace adopts two-stage furnace base and hood resistance belt heating. The output ...

Embodiment 3

[0060] (1) Pickling steel blank

[0061] At room temperature, wash off the oxide skin of the steel plate blank with an external dimension of 8.5×1265×1250mm with hydrochloric acid in a tank-type pickling tank;

[0062] (2) Longitudinal rolling billet

[0063] The pickled steel plate blank is rolled by a four-roller 2300mm reversible cold rolling mill for 7-15 passes, and longitudinally rolled into a steel plate with an external dimension of 5.0×1200×2000mm, with a deformation of 41%. The upper roll: 0.03mm, bottom roller: 0mm;

[0064] (3) Annealing by stacking sheets

[0065] Put the cold-rolled steel plate into the hearth of the electric heating mantle furnace, the furnace load is 80t, and then cover the mantle;

[0066] A adopts plate temperature thermocouple to control temperature, and method is identical with embodiment one;

[0067] The heating in the bell-type furnace adopts two-stage furnace platform and furnace cover resistance belt heating, the output power of th...

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Abstract

The invention relates to a medium carbon steel plate bell-type furnace spheroidizing annealing method, which orderly comprises the following steps that: (1) a hot-rolled blank steel coil is subject to the cutting and acid cleaning; (2) the longitudinal rolling is adopted, and the rolling deformation is between 28 and 41 percent; (3) the single sheet stack annealing is adopted, and a steel plate is loaded into an electric heating bell-type furnace; wherein, a. a plate temperature thermocouple is adopted to control the temperature, and at least two armored thermocouples are inserted; b. the heating in the furnace adopts two-section type furnace platform and furnace mantle resistance bands; c. protective gas in the furnace platform and the furnace mantle is nitrogen; d. after the steel sheet is loaded into the furnace, a safety cover and a heating mantle are fastened to electrify and increase the temperature for 60 to 70 hours, the heat preservation is performed for 4 to 6h when the temperature is increased to between 690 and 720 DEG C, and the surface temperature of the steel plate is less than or equal to 720 DEG C during the heat preservation; e. then the heating mantle is hoisted away to cool naturally, and the steel plate is taken out of the furnace when the temperature of the core of the steel plate is cooled to be below 250 DEG C. The medium carbon steel plate bell-type furnace spheroidizing annealing method adopts one-time annealing, and the spheroidizing qualification rate of metallurgical structures is apparently improved.

Description

technical field [0001] The invention relates to a spheroidizing annealing method for a medium-carbon steel plate, that is, No. 45 steel bell-type furnace. Background technique [0002] With the rapid development of the steel industry, the market demand for medium carbon steel plates is increasing, and the quality requirements for medium carbon steel plates are getting higher and higher. Medium carbon steel plates are widely used in the automotive and aviation industries. After cold rolling and annealing, medium carbon steel plates It is required that the steel plate has a narrow high-mechanical performance band, and at the same time, it is required that the steel has a good metallographic structure, that is, a spheroidized pearlite structure. [0003] The national standard requires that the medium carbon steel plate can be shipped according to the spheroidized pearlite structure or the non-spheroidized pearlite structure. However, the plasticity and toughness of the medium c...

Claims

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Application Information

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IPC IPC(8): C21D1/32
Inventor 李杰
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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