CN103882296B - A kind of special cold rolling non-oriented electrical steel of high-strength wearable and production method thereof - Google Patents

Abstract

The present invention provides a kind of special cold rolling non-oriented electrical steel of high-strength wearable and production method thereof, the chemical component weight percentage ratio of 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 elements.Production method includes molten iron pretreatment, converter smelting, continuous casting, hot rolling, normalizing, cold rolling, annealing; the cold rolling non-oriented electrical steel that the present invention produces; its intensity is high; anti-strike capability is strong; impact resistance, mar proof is good, has excellent electromagnetic performance simultaneously; along with the development of the manufacturing technologies such as electromagnetic switch, relay, electric magnet, the product that the present invention produces can be used widely.

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, take by cold rolling nothing particularly to electric magnet To electrical sheet and production method thereof.

Background technology

Domestic electromagnetic switch or electric magnet mainly use hot rolled silicon steel sheet manufacture, and not only volume is big, with Time steel disc more crisp, mechanical life is low, only 300 ~ 5,000,000 times.It is abroad in the seventies in last century Starting to produce cold rolling non-orientation silicon steel for manufacturing electromagnetic switch, also begin to produce should for Wuhan Iron and Steel Plant subsequently Product, but be all the product concentrating on 0.6 ~ 0.7 mm, they are a lot of at relay, electric magnet etc. Impact resistance on field, mar proof all can not meet requirement.

And thickness is the most seldom mentioned at the electromagnetic switch non-orientation silicon steel of 0.8 ~ 1.0mm, and respectively The production technology of enterprise is all protected by, and the Patents retrieved at present is the phase of hot rolled silicon steel Close production method.

Summary of the invention

The present invention 0.8 ~ 1.0mm electromagnetic switch cold rolling non-oriented electrical steel product, intensity and hardness are high, There is good impact resistance, be widely suitable for dual pressure control switch, relay, electromagnetism Equipment.

The present invention is applicable to the production of 0.8 ~ 1.0mm electromagnetic switch cold rolling non-oriented electrical steel product, logical Cross the technique controlling to smelt composition and each production process to realize its performance requirement.

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 For Fe and other inevitable residual elements.

Carbon: because trimmed size is thick, it is impossible to carry out carbonization treatment in last heat treatment, so in converter During smelting, use the quick carbon drop of top and bottom complex blowing, control below 0.003%；

Silicon: Si can reduce iron loss, can improve resistivity, reduces the anisotropy of crystal grain, promotes Grain coarsening, reduces crystal boundary face；Silicon can also promote carbon graphite, improves carbon shadow unfavorable to magnetic Ringing, raising product strength, the impact resistance improved during product uses, minimizing magnetostriction reduce Noise, has been reported that Si content reaches magnetostriction when 6.5% almost nil, but too high levels is crisp Property can increase, make troubles to big production；

Manganese: in chemical composition, the content of Mn is higher, because its solution strengthening effect is obvious, typically adds 1% The Mn of left and right, the yield strength of steel can improve 32N/mm², and less on electromagnetic performance impact, Also it is not result in that fragility increases, moreover it is possible to improve product combination property, improve product cold-workability；

Phosphorus: phosphorus content increase causes grain boundaries to have more segregation, makes crystal grain refine, and makes low-carbon (LC) electrician The coercivity of steel increases, but affects product cold-workability simultaneously, occurs cold short；

Sulfur: harmful element.Smelting process control is carried out in conjunction with integrated cost, the lowest more good, at this Bright middle control less than 0.0015% be technique and cost optimal；

Nitrogen: harmful element.It is optimal for controlling less than 0.0025% in the present invention；

Residual elements: it is optimal that niobium, vanadium, titanium control less than 0.0020%；

The technology controlling and process produced is as follows:

A. molten iron pretreatment: control sulfur content；

B. converter smelting: use the quick carbon drop of top and bottom complex blowing, RH vacuum refining processes, and removes in steel Hydrogen and nitrogen harmful gas；

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

D. hot rolling: steel billet use low-temperature heat, stability contorting at 1050 ~ 1150 DEG C, homogeneous temperature after heat Rolling, employing high temperature scheme is batched in finish rolling finish to gauge, it is ensured that coiling temperature >=720 DEG C, bigger to obtain Ratio recrystallized structure, makes top layer crystalline structure bring up to 40% ~ 60%, and hot rolled plate THICKNESS CONTROL exists 2.5~5mm；Hot rolled coil is pre-cold rolling, promotes recrystallized surface layer metaplasia, energy storage；

E. normalizing: process speed 40 ~ 50m/min, temperature 950 ~ 1000 DEG C acquisition is the most tiny ties again Brilliant tissue, crystallite dimension controls in 130 ~ 150 μm；

The most cold rolling: to use once cold rolling method by hot rolled plate mill product thickness；

G. annealing: carry out decarburizing annealing in continuous annealing furnace, the operation such as insulating coating makes finished product, its Middle annealing speed controls at 80 ~ 100m/min, and temperature 920 ~ 950 DEG C obtains tiny recrystallized structure , improve intensity and hardness.

The cold rolling non-oriented electrical steel produced by this technical scheme, its intensity is high, and anti-strike capability is strong, Impact resistance, mar proof is good, has excellent electromagnetic performance simultaneously, along with electromagnetic switch, The development of the manufacturing technology such as relay, electric magnet, the product that the present invention produces can obtain extensively General application.

Detailed description of the invention

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 ferrum and other inevitable impurity element.

Process is as follows:

A) molten iron pretreatment: control sulfur content；

B) converter smelting: use the quick carbon drop of top and bottom complex blowing, RH vacuum refining processes, and removes hydrogen in steel With nitrogen harmful gas；

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

D) hot rolling: use low-temperature heat, coiling temperature 725 DEG C, Surface Recrystallization tissue 45%, hot rolling Plate thickness controls at 3mm, and hot rolled coil is pre-cold rolling；

E) normalizing: process speed 40m/min, temperature 960 DEG C, crystallite dimension 145 μm after normalizing；

F) cold rolling: to use single chassis reversable mill that hot rolled plate is rolled into the one-tenth that target thickness is 0.85mm Product plate；

G) annealing: process speed 90m/min, temperature 930 DEG C, and use dry hydrogen light decarburizing annealing, It is coated with the operations such as insulating barrier and makes finished product.

Embodiment 2:C:0.0019%, Si:3.48%, Mn:1.0%, P:0.015%, S:0.00 12%, Als:0.005%, N:0.0019%, Ti:0.0008%, Nb:0.0019%, V: 0.0015%；Surplus is ferrum and other inevitable impurity element.

Process is as follows:

A) molten iron pretreatment: control sulfur content；

B) converter smelting: use the quick carbon drop of top and bottom complex blowing, RH vacuum refining processes, and removes hydrogen in steel With nitrogen harmful gas；

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

D) hot rolling: use low-temperature heat, coiling temperature 730 DEG C, Surface Recrystallization tissue 48%, hot rolling Plate thickness controls at 4mm, and hot rolled coil is pre-cold rolling；

E) normalizing: process speed 45m/min, temperature 980, crystallite dimension 138 μm after normalizing；

F) cold rolling: to use single chassis reversable mill that hot rolled plate is rolled into the one-tenth that target thickness is 0.90mm Product plate；

G) annealing: process speed 90m/min, temperature 930 DEG C, and use dry hydrogen light decarburizing annealing, It is coated with the operations such as insulating barrier and makes finished product.

Embodiment 3:C:0.0023%, Si:3.15%, Mn:1.2%, P:0.014%, S:0.00 17%, Als:0.005%, N:0.0020%, Ti:0.0011%, Nb:0.0014%, V: 0.0018%；Surplus is ferrum and other inevitable impurity element.

Process is as follows:

A) molten iron pretreatment: control sulfur content；

B) converter smelting: use the quick carbon drop of top and bottom complex blowing, RH vacuum refining processes, and removes hydrogen in steel With nitrogen harmful gas；

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

D) hot rolling: use low-temperature heat, coiling temperature 728 DEG C, Surface Recrystallization tissue 50%, hot rolling Plate thickness controls at 5mm, and hot rolled coil is pre-cold rolling；

E) normalizing: process speed 46m/min, temperature 945 DEG C, crystallite dimension 139 μm after normalizing；

F) cold rolling: to use single chassis reversable mill that hot rolled plate is rolled into the one-tenth that target thickness is 0.85mm Product plate；

G) annealing: process speed 90m/min, temperature 930 DEG C, and use dry hydrogen light decarburizing annealing, It is coated with the operations such as insulating barrier and makes finished product.

Properties of product (are weighed with B25 and P10/50)

Claims (1)

1. the special cold rolling non-oriented electrical steel of high-strength wearable, it is characterised in that the chemical component weight of steel Percentage ratio 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 elements；The production method of steel comprises the following steps:

A. molten iron pretreatment: control sulfur content within the above range；

B. converter smelting: use the quick carbon drop of top and bottom complex blowing, RH vacuum refining processes, remove in steel hydrogen and Nitrogen harmful gas；

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

D. hot rolling: steel billet use low-temperature heat, stability contorting at 1050～1150 DEG C, hot rolling after homogeneous temperature, Employing high temperature scheme is batched in finish rolling finish to gauge, it is ensured that coiling temperature >=720 DEG C, hot rolled plate THICKNESS CONTROL exists 2.5～5mm；Hot rolled coil is pre-cold rolling；

E. normalizing: process speed 40～50m/min, temperature 950～1000 DEG C, it is thus achieved that uniform tiny recrystallization Tissue, crystallite dimension controls in 130～150 μm；

The most cold rolling: to use once cold rolling method by hot rolled plate mill product thickness；

G. annealing: carrying out decarburizing annealing in continuous annealing furnace, insulating coating operation is made finished product, wherein annealed Speed controlling is 80～100m/min, and temperature 920～950 DEG C obtain tiny recrystallized structures, improve intensity and Hardness.