CN109722603A

CN109722603A - A kind of electrode shell cold-rolled steel sheet of low yield strength high current density

Info

Publication number: CN109722603A
Application number: CN201910201813.XA
Authority: CN
Inventors: 胡洪林; 马孝娟; 卢鹏程
Original assignee: Xinjiang Bayi Iron and Steel Co Ltd
Current assignee: Xinjiang Bayi Iron and Steel Co Ltd
Priority date: 2019-03-18
Filing date: 2019-03-18
Publication date: 2019-05-07

Abstract

The invention discloses a kind of electrode shell cold-rolled steel sheets of low yield strength high current density, electrode shell cold-rolled steel sheet ingredient %:C < 0.010, Mn < 0.015, P < 0.010, S < 0.006, hot rolling raw thickness is 6.0mm, cold-rolled products are with a thickness of 3.0mm, the cold and hot thickness deformation rate of rolling of cold-rolled steel sheet is 50%-55%, cold rolling cover annealing technique: cold-rolled steel sheet nominal thickness is more than or equal to 2.0mm, less than 3.2mm, controlled at 730 degree, batch is less than 45 ton hours, technique heating time is 6 hours, soaking time is at least 6 hours, to cover time 2 h, tapping temperature is 85 degree；Batch is greater than 75 ton hours, and technique heating time is 10 hours, and soaking time is at least 7 hours, and to cover time 2 h, tapping temperature is 105 degree；Cold rolling levelling elongation percentage: between 1.3%--1.7%, formation plate shape requires chilled box to be not more than 1% for thickness minimum value 2mm, maximum thickness 3mm, width minimum 750mm, width maximum value 1300mm, smooth elongation percentage.The present invention can be improved the current density of electrode shell steel plate.

Description

A kind of electrode shell cold-rolled steel sheet of low yield strength high current density

Technical field

The present invention relates to a kind of electrode shell cold-rolled steel sheets of low yield strength high current density.

Background technique

Electrode shell is the key component of self-baking electrode, electrode shell it is intact whether be directly related to production can safely, even Continuous, stable operation, is indispensable security factors in production process.But with calcium carbide production deepen continuously, electrode not In the case where roasting, electrode shell burning damage accident at contact element repeated, both interrupted the continuous operation of production, also band Huge security risk is carried out.Since electrode shell scaling loss less serious case causes the damage of contact element, severe one causes melt electrode arc Leakage or even the soft of electrode are broken, therefore the reason of induction electrode shell scaling loss becomes another urgent problem to be solved in calcium carbide production.

During electrode baking, electrode shell not only makes electrode moulding but also and electric action.Relevant information shows, Since the electrical conductivity of steel material is big and kelvin effect in conducting process, the electric current passed through in electrode shell is total current 80% or so, this improves the manufacture difficulty and precision of electrode shell, to electrode shell manufacture material therefor selection propose it is higher It is required that.

Summary of the invention

The purpose of the present invention is to provide a kind of electrode shell cold-rolled steel sheet of low yield strength high current density, Neng Gouti The current density of high electrode shell steel plate, makes up the deficiencies in the prior art.

The object of the present invention is achieved like this, a kind of electrode shell cold-rolled steel sheet of low yield strength high current density, Electrode shell cold-rolled steel sheet ingredient %:C < 0.010, Mn < 0.015, P < 0.010, S < 0.006, hot rolling raw thickness are 6.0mm, for cold-rolled products with a thickness of 3.0mm, the cold and hot thickness deformation rate of rolling of cold-rolled steel sheet is 50%-55%, cold rolling cover annealing technique: cold Rolled steel plate nominal thickness is more than or equal to 2.0mm, is less than 3.2mm, controlled at 730 degree, 1, batch is less than 45 ton hours, technique Heating time is 6 hours, and soaking time is at least 6 hours, and to cover time 2 h, tapping temperature is 85 degree；2, batch is less than 55 tons are greater than 45 ton hours, and technique heating time is 7 hours, and soaking time is at least 6 hours, to cover time 2 h, tapping temperature It is 90 degree；3, batch is greater than 55 ton hours less than 65 tons, and technique heating time is 8 hours, and soaking time is at least 7 hours, to Cover time 2 h, tapping temperature are 95 degree；4, batch is greater than 65 ton hours less than 75 tons, and technique heating time is 9 hours, protects The warm time is at least 7 hours, and to cover time 2 h, tapping temperature is 100 degree；5, batch is greater than 75 ton hours, when technique heats Between be 10 hours, soaking time is at least 7 hours, and to cover time 2 h, tapping temperature is 105 degree；Cold rolling levelling elongation percentage: Thickness minimum value 2mm, maximum thickness 3mm, width minimum 750mm, width maximum value 1300mm, smooth elongation percentage exist Between 1.3%--1.7%, formation plate shape requires chilled box to be not more than 1%.

The steel plate produced using the method for the present invention, yield strength≤200MPa, current density >=2.35A/mm²。

The present invention uses lower carbon/manganese ingredient, is aided with suitable cold-rolling deformation rate and higher annealing temperature reaches To the requirement of low surrender high current density.The diameter ratio of carbon atom and iron atom forms interstitial solid solution, solute less than 0.59 Statistical distribution is presented in atomic carbon in interstitial solid solution, forms random solid solution, when random solid solution is reduced, the resistance of material Rate rises, and current density value rises, therefore the electricity for significantly reducing the method raising carbon steel of carbon component is taken for traditional carbon steel Current density.

The key of cold-rolling process is to control suitable deformation rate, to obtain the expected strength of materials.Steel plate passes through cold rolling Grain deformation distorts afterwards, and pile-up of dislocation generates strain hardening, increases internal stress and intensity, obtains enough deformation energy, and not Excessive strain hardening is generated, by bell type annealing furnace recrystallization annealing, makes material structure that recovery and recrystallization forming core, crystalline substance occur Grain length is big, and after texture is formed completely, intensity can drop to 200MPa or less.Therefore, by control material deformation rate and Final properties of product can be obtained in annealing temperature and annealing time.

Electrode shell cold-rolled steel sheet rolls after-hardening using low-carbon cold plate and makees by using the carbon steel for significantly reducing carbon component With control bell type annealing furnace makes material structure that recovery and recrystallization forming core, crystalline substance occur in suitable high temperature by adequately annealing Grain length is formed until texture greatly completely, so that lower yield strength is kept while improving the current density of cold-rolled steel sheet, Open the production new way of electrode shell steel.

The present invention uses lower carbon/manganese ingredient, is aided with suitable cold-rolling deformation rate and higher annealing temperature The mode of degree successfully produces electrode shell cold-rolled steel sheet in batches, detects to the product produced, performance indicator is complete Full up foot performance indicator requirement, the quality requirement of electrode shell cold-rolled steel sheet is also fully consistent with through user using verifying.

The present invention includes heating-hot continuous rolling-section cooling-suitable for steel rolling and batches-cold-rolling pickling-cold rolling mill- The steel production enterprise of the tooling device of cold rolled annealed-smooth-rewinding packaging.

Specific embodiment

A kind of electrode shell cold-rolled steel sheet of low yield strength high current density, electrode shell with cold-rolled steel sheet ingredient %:C < 0.010, Mn < 0.015, P < 0.010, S < 0.006, hot rolling raw thickness are 6.0mm, and cold-rolled products are cold with a thickness of 3.0mm Rolled steel plate it is cold and hot roll thickness deformation rate be 50%-55%, cold rolling cover annealing technique: cold-rolled steel sheet nominal thickness be more than or equal to 2.0mm, Less than 3.2mm, controlled at 730 degree, 1, batch less than 45 ton hours, technique heating time is 6 hours, and soaking time is at least It is 6 hours, to cover time 2 h, tapping temperature is 85 degree；2, batch is greater than 45 ton hours, technique heating time less than 55 tons It is 7 hours, soaking time is at least 6 hours, and to cover time 2 h, tapping temperature is 90 degree；3, batch is greater than less than 65 tons 55 ton hours, technique heating time are 8 hours, and soaking time is at least 7 hours, and to cover time 2 h, tapping temperature is 95 degree； 4, batch is greater than 65 ton hours less than 75 tons, and technique heating time is 9 hours, and soaking time is at least 7 hours, to the cover time 2 Hour, tapping temperature is 100 degree；5, batch is greater than 75 ton hours, and technique heating time is 10 hours, and soaking time is at least 7 Hour, to cover time 2 h, tapping temperature is 105 degree；Cold rolling levelling elongation percentage: thickness minimum value 2mm, maximum thickness 3mm, width minimum 750mm, width maximum value 1300mm, smooth elongation percentage are between 1.3%--1.7%, the requirement of formation plate shape Chilled box is not more than 1%.

Claims

1. a kind of electrode shell cold-rolled steel sheet of low yield strength high current density, it is characterised in that: electrode shell cold-rolled steel sheet Ingredient %:C < 0.010, Mn < 0.015, P < 0.010, S < 0.006, hot rolling raw thickness be 6.0mm, cold-rolled products with a thickness of 3.0mm, the cold and hot thickness deformation rate of rolling of cold-rolled steel sheet is 50%-55%, cold rolling cover annealing technique: cold-rolled steel sheet nominal thickness is greater than etc. In 2.0mm, be less than 3.2mm, controlled at 730 degree, 1, batch less than 45 ton hours, technique heating time is 6 hours, is kept the temperature Time is at least 6 hours, and to cover time 2 h, tapping temperature is 85 degree；2, batch is greater than 45 ton hours, technique less than 55 tons Heating time is 7 hours, and soaking time is at least 6 hours, and to cover time 2 h, tapping temperature is 90 degree；3, batch is less than 65 tons are greater than 55 ton hours, and technique heating time is 8 hours, and soaking time is at least 7 hours, to cover time 2 h, tapping temperature It is 95 degree；4, batch is greater than 65 ton hours less than 75 tons, and technique heating time is 9 hours, and soaking time is at least 7 hours, to Cover time 2 h, tapping temperature are 100 degree；5, batch is greater than 75 ton hours, and technique heating time is 10 hours, soaking time At least 7 hours, to cover time 2 h, tapping temperature was 105 degree；Cold rolling levelling elongation percentage: thickness minimum value 2mm, thickness are most Big value 3mm, width minimum 750mm, width maximum value 1300mm, smooth elongation percentage are between 1.3%--1.7%, formation plate shape It is required that chilled box is not more than 1%.