CN106282745A - A kind of production method of non-oriented electrical steel - Google Patents

Abstract

The present invention provides the production method of a kind of non-oriented electrical steel, it is characterized in that, non-oriented electrical steel chemical composition mass percentage content is: C:0.006～0.018%, Si:0.6～3.0%, Als:0～0.8%, Mn:0.10～0.30%, P≤0.03%, S≤0.015%, N≤0.0050%；Slab heating temperature 1150～1220 DEG C, be just rolled to 35～45mm thick, enter mm finishing mill unit, batch after being rolling to 1.8～2.8mm after stopping 20～60s；Finish rolling start rolling temperature controls more than 950 DEG C, finishing temperature control at 850～890 DEG C, coiling temperature 700～780 DEG C；0.3～0.55mm it is cold-rolled to after pickling；Continuous annealing temperature 800～860 DEG C, use H₂+N₂Protection, dew point of atmosphere controls at 20～35 DEG C, and finished product carbon controls at below 25ppm.The present invention can shorten heat time heating time, improves the efficiency of heating surface, and heat sensitivity is little, it is to avoid the problem that the fluctuation of entire volume iron loss is bigger occurs, reduces iron loss, improves final products performance.

Description

A kind of production method of non-oriented electrical steel

Technical field

The invention belongs to metallurgical technology technical field, particularly to the production method of a kind of non-oriented electrical steel.

Background technology

Carbon in cold rolling non-oriented electrical steel in use can separate out, and makes iron loss raise, and produces timeliness Phenomenon, so the carbon in steel is harmful element, smelting process strictly controls.Common process is at refining process By carbon content control at reduced levels.Course of hot rolling uses low-temperature heat, it is to avoid the two-phase analysis of solid solution in steel Go out.

Summary of the invention

It is an object of the invention to provide one and can shorten heat time heating time, heat sensitivity is little, it is to avoid entire volume iron loss Fluctuation, the production method of the non-oriented electrical steel of excellent product performance.

For reaching this purpose, this invention takes following technical solution:

The production method of a kind of non-oriented electrical steel, it is characterised in that non-oriented electrical steel chemical composition quality Degree is: C:0.006～0.018%, Si:0.6～3.0%, Als:0～0.8%, Mn:0.10～ 0.30%, P≤0.03%, S≤0.015%, N≤0.0050%, remaining is Fe and the most remaining unit Element；Its concrete production technology is:

(1) using converter smelting, RH vacuum refining processes, molten steel is cast 200～250mm heavy slabs；

(2) slab heating temperature 1150～1220 DEG C, are just rolled to 35～45mm thick, after stopping 20～60s Enter mm finishing mill unit, batch after being rolling to 1.8～2.8mm；Finish rolling start rolling temperature controls more than 950 DEG C, Finishing temperature control at 850～890 DEG C, coiling temperature 700～780 DEG C；

(3) 0.3～0.55mm it is cold-rolled to after pickling；

(4) cold rolling rear continuous annealing, annealing temperature 800～860 DEG C, use H₂+N₂Protection, atmosphere is revealed Point control is at 20～45 DEG C, and finished product carbon controls at below 25ppm.

The invention have the benefit that

1, use higher heating-up temperature, shorten heat time heating time, improve the efficiency of heating surface.

2, heat sensitivity is little, it is to avoid the problem that the fluctuation of entire volume iron loss is bigger occur.

3, reducing iron loss, final products performance is more excellent, iron loss 4.32W/kg, magnetic strength, 1.73T.

Detailed description of the invention

The chemical component weight percentage ratio of embodiment orientation silicon steel is: C:0.011%, Si:0.82%, Mn: 0.22%, P:0.014%, S:0.003%, Als:0.20%, N:0.0025%, remaining is ferrum and can not The impurity element avoided.

Production method includes following process steps:

1, smelting and continuous casting: use converter smelting, RH vacuum refining processes, and molten steel composition presses above-mentioned requirements Control, cast 230mm heavy slab；

2, hot rolling heating-up temperature 1180 DEG C, enters mm finishing mill unit rolling after being just rolled to 38mm after stopping 40s. Finish rolling start rolling temperature 980 DEG C, finishing temperature 870 DEG C, coiling temperature 740 DEG C, it is hot-rolled down to 2.5mm；

3, it is cold-rolled to 0.5mm after pickling；

4, cold rolling rear continuous annealing, annealing temperature 830 DEG C, use H₂+N₂Protection, dew point of atmosphere controls At 28 DEG C.Carbon in steel is taken off to 0.0020.

Carbon content 0.003% when comparative example is smelted, other composition is identical with embodiment.Result proves:

Embodiment iron loss 4.32W/kg, magnetic strength 1.73T, comparative example iron loss 4.85W/kg, magnetic strength 1.71T, The i.e. present invention can reduce iron loss 0.53W/kg, improves magnetic strength 0.02T.

Claims (1)

1. the production method of a non-oriented electrical steel, it is characterised in that non-oriented electrical steel chemical composition matter Amount degree be: C:0.006～0.018%, Si:0.6～3.0%, Als:0～0.8%, Mn:0.10～ 0.30%, P≤0.03%, S≤0.015%, N≤0.0050%, remaining is Fe and the most remaining unit Element；Its concrete production technology is:

(1) using converter smelting, RH vacuum refining processes, molten steel is cast 200～250mm heavy slabs；

(2) slab heating temperature 1150～1220 DEG C, are just rolled to 35～45mm thick, after stopping 20～60s Enter mm finishing mill unit, batch after being rolling to 1.8～2.8mm；Finish rolling start rolling temperature controls more than 950 DEG C, Finishing temperature control at 850～890 DEG C, coiling temperature 700～780 DEG C；

(3) 0.3～0.55mm it is cold-rolled to after pickling；

(4) cold rolling rear continuous annealing, annealing temperature 800～860 DEG C, use H₂+N₂Protection, atmosphere is revealed Point control is at 20～45 DEG C, and finished product carbon controls at below 25ppm.