CN103882296A - High-strength wear-resistant special cold-rolled non-oriented electrical steel and production method thereof - Google Patents

Abstract

The invention provides a high-strength wear-resistant special cold-rolled non-oriented electrical steel and a production method thereof. The electrical steel is composed of the following chemical components in percentage by weight: not more than 0.0030% of C, 3.0% to 3.5% of Si, 0.5% to 1.5% of Mn, 0.005% to 0.20% of P, not more than 0.0015% of S, not more than 0.0025% of N, not more than 0.005% of Als, not more than 0.0020% of Ti, not more than 0.0020% of Nb, not more than 0.0020% of V, and the balance being Fe and other inevitable residual elements. The production method comprises the processes of molten iron pretreatment, converter smelting, continuous casting, hot rolling, normalizing, cold rolling, and annealing. The cold-rolled non-oriented electrical steel has the advantages of high strength, strong impact resistant performance, good collision resistant property, good wear resistant property, and excellent electromagnetic performance. As the manufacturing technology of electromagnetic switch, relay, and electromagnet continuously develops, the electrical steel will be widely used in these fields.

Description

A kind of special cold rolling non-oriented electrical steel of high-strength wearable and production method thereof

Technical field

The invention belongs to the production technical field of electrical steel product, particularly cold rolling non-oriented electrical steel and production method thereof for electro-magnet.

Background technology

Domestic Mgs or electro-magnet are mainly used hot rolled silicon steel sheet manufacture in early days, and not only volume is large, and steel disc is more crisp simultaneously, and mechanical life is low, only has 300 ~ 5,000,000 times.Abroad to start to produce cold rolling non-orientation silicon steel for the manufacture of Mgs in the seventies in last century, Wuhan Iron and Steel Plant also starts to produce this product subsequently, but be all the product that concentrates on 0.6 ~ 0.7 mm, they are impact resistance on a lot of fields such as rly., electro-magnet, and wearability all can not meet the demands.

And thickness is seldom mentioned with non orientating silicon steel both at home and abroad in the Mgs of 0.8 ~ 1.0mm, and the production technology of each enterprise all protected, and the Patents retrieving is at present the related methods of production of hot rolled silicon steel.

Summary of the invention

The present invention 0.8 ~ 1.0mm Mgs cold rolling non-oriented electrical steel product, intensity and hardness are high, have good impact resistance, are applicable to widely dual pressure control switch, rly., electromagnetic installing standby.

The present invention is applicable to the production of 0.8 ~ 1.0mm Mgs cold rolling non-oriented electrical steel product, and the technique of smelting composition and each production process by control realizes its performance requriements.

Its chemical composition is wt%:

C≤0.0030%, Si:3.0% ~ 3.5%, Mn:0.5% ~ 1.5%, P:0.005% ~ 0.20%, S≤0.0015%, N≤0.0025%, Als≤0.005%, Ti, Nb, V difference≤0.0020%, surplus is Fe and other inevitable residual element.

Carbon: because trimmed size is thick, in the end carry out carbonization treatment in thermal treatment, so in the time of converter smelting, adopt the quick carbon drop of top and bottom complex blowing, be controlled at below 0.003%;

Silicon: Si can reduce iron loss, can improve resistivity, reduces the anisotropy of crystal grain, impels grain coarsening, reduces crystal boundary face; Silicon can also impel carbon graphite, improve carbon to magnetic disadvantageous effect, the impact resistance, the minimizing magnetostriction that improve product strength, improve in product use reduce noise, while having report Si content to reach 6.5%, magnetostriction is almost nil, but too high levels fragility can increase, make troubles to large production;

Manganese: in chemical composition, the content of Mn is higher, obvious because of its solution strengthening effect, generally add the Mn of 1% left and right, the yield strength of steel can improve 32N/mm ², and less on electromagnetic performance impact, can not cause fragility to increase yet, can also improve product over-all properties, improve product cold-workability;

Phosphorus: phosphorus content increase causes grain boundaries to have more segregation, makes grain refining, increases the coercive force of low-carbon (LC) electrical steel, but affects product cold-workability simultaneously, occurs cold short;

Sulphur: harmful element.Carry out smelting process control in conjunction with comprehensive cost, more low better, controlling in the present invention below 0.0015% is technique and cost the best;

Nitrogen: harmful element.Control in the present invention below 0.0025% as best;

Residual element: niobium, vanadium, titanium control are best below 0.0020%;

The technology controlling and process of producing is as follows:

A. hot metal pretreatment: control sulphur content;

B. converter smelting: adopt the quick carbon drop of top and bottom complex blowing, RH vacuum refinement processing, removes hydrogen and nitrogen obnoxious flavour in steel;

C. continuous casting: adopt continuous casting mode that molten steel is cast to base;

D. hot rolling: steel billet adopts low-temperature heat, stablize and be controlled at 1050 ~ 1150 DEG C, the evenly rear hot rolling of temperature, the high temperature scheme that adopts is batched in finish rolling finish to gauge, ensure curling temperature >=720 DEG C, to obtain larger proportion recrystallized structure, make top layer crystal structure bring up to 40% ~ 60%, hot-rolled sheet gauge control is at 2.5 ~ 5mm; Hot rolled coil is cold rolling in advance, promotes recrystallized surface layer metaplasia, energy storage;

E. normalizing: process speed 40 ~ 50m/min, 950 ~ 1000 DEG C of even tiny recrystallized structures of acquisition of temperature, grain-size is controlled at 130 ~ 150 μ m;

F. cold rolling: to adopt once cold rolling method by hot-rolled sheet mill product thickness;

G. annealing: carry out decarburizing annealing in continuous annealing furnace, the operations such as insulating coating are made finished product, and wherein annealing speed is controlled at 80 ~ 100m/min, 920 ~ 950 DEG C of tiny recrystallized structures of acquisition of temperature, improve intensity and hardness.

The cold rolling non-oriented electrical steel of producing by this technical scheme, its intensity is high, anti-strike capability is strong, impact resistance, wearability is good, have good electromagnetic performance, along with the development of the manufacturing technologies such as Mgs, rly., electro-magnet, the product that the present invention produces can be used widely simultaneously.

Embodiment

Embodiment 1:C:0.0025%, Si:3.3%, Mn:1.2%, P:0.012%, S:0.001%, Als:0.005%, N:0.0021%, Ti:0.0010%, Nb:0.0018%, V:0.0017%; Surplus is iron and other inevitable impurity element.

Process is as follows:

A) hot metal pretreatment: control sulphur content;

B) converter smelting: adopt the quick carbon drop of top and bottom complex blowing, RH vacuum refinement processing, removes hydrogen and nitrogen obnoxious flavour in steel;

C) continuous casting: and adopt continuous casting mode that molten steel is cast to steel billet;

D) hot rolling: adopt low-temperature heat, 725 DEG C of coiling temperatures, Surface Recrystallization tissue 45%, hot-rolled sheet gauge control is at 3mm, and hot rolled coil is cold rolling in advance;

E) normalizing: process speed 40m/min, 960 DEG C of temperature, grain-size 145 μ m after normalizing;

F) cold rolling: to adopt single chassis reversable mill that hot-rolled sheet is rolled into the production board that target thickness is 0.85mm;

G) annealing: process speed 90m/min, 930 DEG C of temperature, and adopt the operations such as the decarburizing annealing of dry hydrogen light, painting insulation layer to make finished product.

Embodiment 2:C:0.0019%, Si:3.48%, Mn:1.0%, P:0.015%, S:0.0012%, Als:0.005%, N:0.0019%, Ti:0.0008%, Nb:0.0019%, V:0.0015%; Surplus is iron and other inevitable impurity element.

Process is as follows:

A) hot metal pretreatment: control sulphur content;

B) converter smelting: adopt the quick carbon drop of top and bottom complex blowing, RH vacuum refinement processing, removes hydrogen and nitrogen obnoxious flavour in steel;

C) continuous casting: and adopt continuous casting mode that molten steel is cast to steel billet;

D) hot rolling: adopt low-temperature heat, 730 DEG C of coiling temperatures, Surface Recrystallization tissue 48%, hot-rolled sheet gauge control is at 4mm, and hot rolled coil is cold rolling in advance;

E) normalizing: process speed 45m/min, temperature 980, grain-size 138 μ m after normalizing;

F) cold rolling: to adopt single chassis reversable mill that hot-rolled sheet is rolled into the production board that target thickness is 0.90mm;

G) annealing: process speed 90m/min, 930 DEG C of temperature, and adopt the operations such as the decarburizing annealing of dry hydrogen light, painting insulation layer to make finished product.

Embodiment 3:C:0.0023%, Si:3.15%, Mn:1.2%, P:0.014%, S:0.0017%, Als:0.005%, N:0.0020%, Ti:0.0011%, Nb:0.0014%, V:0.0018%; Surplus is iron and other inevitable impurity element.

Process is as follows:

A) hot metal pretreatment: control sulphur content;

B) converter smelting: adopt the quick carbon drop of top and bottom complex blowing, RH vacuum refinement processing, removes hydrogen and nitrogen obnoxious flavour in steel;

C) continuous casting: and adopt continuous casting mode that molten steel is cast to steel billet;

D) hot rolling: adopt low-temperature heat, 728 DEG C of coiling temperatures, Surface Recrystallization tissue 50%, hot-rolled sheet gauge control is at 5mm, and hot rolled coil is cold rolling in advance;

E) normalizing: process speed 46m/min, 945 DEG C of temperature, grain-size 139 μ m after normalizing;

F) cold rolling: to adopt single chassis reversable mill that hot-rolled sheet is rolled into the production board that target thickness is 0.85mm;

G) annealing: process speed 90m/min, 930 DEG C of temperature, and adopt the operations such as the decarburizing annealing of dry hydrogen light, painting insulation layer to make finished product.

Product performance (weighing with B25 and P10/50)

Claims (2)

1. the special cold rolling non-oriented electrical steel of high-strength wearable, the chemical component weight per-cent that it is characterized in that steel is: C≤0.0030%, Si:3.0% ~ 3.5%, Mn:0.5% ~ 1.5%, P:0.005% ~ 0.20%, S≤0.0015%, N≤0.0025%, Als≤0.005%, Ti, Nb, V difference≤0.0020%, surplus is Fe and other inevitable residual element.

2. for a production method for the special cold rolling non-oriented electrical steel of high-strength wearable claimed in claim 1, it is characterized in that comprising the following steps:

A. hot metal pretreatment: control sulphur content in the scope described in claim 1;

B. converter smelting: adopt the quick carbon drop of top and bottom complex blowing, RH vacuum refinement processing, removes hydrogen and nitrogen obnoxious flavour in steel;

C. continuous casting: adopt continuous casting mode that molten steel is cast to base;

D. hot rolling: steel billet adopts low-temperature heat, stablizes and is controlled at 1050 ~ 1150 DEG C, the evenly rear hot rolling of temperature, and finish rolling finish to gauge is batched and is adopted high temperature scheme, ensures curling temperature >=720 DEG C, and hot-rolled sheet gauge control is at 2.5 ~ 5mm; Hot rolled coil is cold rolling in advance;

E. normalizing: process speed 40 ~ 50m/min, 950 ~ 1000 DEG C of temperature, obtain even tiny recrystallized structure, and grain-size is controlled at 130 ~ 150 μ m;

F. cold rolling: to adopt once cold rolling method by hot-rolled sheet mill product thickness;

G. annealing: carry out decarburizing annealing in continuous annealing furnace, the operations such as insulating coating are made finished product, and wherein annealing speed is controlled at 80 ~ 100m/min, 920 ~ 950 DEG C of tiny recrystallized structures of acquisition of temperature, improve intensity and hardness.