CN103194670B

CN103194670B - A kind of Steel strip for household electric appliance panel and manufacture method

Info

Publication number: CN103194670B
Application number: CN201310099626.8A
Authority: CN
Inventors: 潘小成; 黄爱军; 祝海容; 刘海潮
Original assignee: LONSEN STEEL STRIP CO Ltd
Current assignee: LONSEN STEEL STRIP CO Ltd
Priority date: 2013-03-26
Filing date: 2013-03-26
Publication date: 2015-10-21
Anticipated expiration: 2033-03-26
Also published as: CN103194670A

Abstract

The invention provides a kind of home appliance panel overlay film deep-draw steel band, its chemical composition mass content is as follows: 0.01%≤C≤0.03%; 0% < Si≤0.02%; 0.1%≤Mn≤0.25%; 0% < P≤0.02%; 0% < S≤0.025%; 0.02%≤Al≤0.05%; Surplus is Fe; Household electrical appliances high rigidity steel band of the present invention is through test of many times and the specification of quality trying out the intensity, hardness and the unit elongation that meet panel of refrigerator steel completely, be subject to enjoying great popularity of client at present, because household electrical appliances cold-rolled steel strip development prospect is boundless, therefore it has application value, and prospect is very wide.

Description

A kind of Steel strip for household electric appliance panel and manufacture method

(1) technical field

The present invention relates to a kind of Steel strip for household electric appliance panel (LJD-F) steel band and manufacture method.

(2) background technology

The emerging industry that household electrical appliances industry is formed after being reform and opening-up, along with several years ago household electrical appliances are gone to the countryside the implementation of policy, domestic demand market particularly rural market demand is vigorous, the cold-rolled steel strip producing household appliances also has difference greatly according to the requirement of the difference of its corresponding household appliances to plate property and surface, as panel of refrigerator because the punching press of door handle position then requires that steel plate punched better performances requires again to have certain intensity after baking comparatively deeply simultaneously, in addition due to household electrical appliances steel directly as the finished product outward appearance thus to board surface quality require also higher, macroscopic defect can not be there is in one side.

According to a large amount of investigational data to client, determine that the demand of panel of refrigerator overlay film class deep-draw steel to steel band is:

Common cold-rolled steel strip can not meet the specification of quality producing household electrical appliances steel because of defects such as it are partially hard, surface treatment is bad.

(3) summary of the invention

The object of the invention is to provide a kind of Steel strip for household electric appliance panel and manufacture method thereof of specification of quality of satisfied production household appliances.

The technical solution used in the present invention is:

A kind of Steel strip for household electric appliance panel, its chemical composition mass content is as follows:

0.01%≤C≤0.03%；0%＜Si≤0.02%；0.1%≤Mn≤0.25%；

0%＜P≤0.02%；0%＜S≤0.025%；0.02%≤Al≤0.05%；

Surplus is Fe; Wherein also may containing micro-inevitable impurity;

Its thickness is 0.4 ~ 0.5mm, and width is 930 ~ 1390mm.

Preferably, its chemical composition mass content is as follows:

0.015%≤C≤0.02%；0.1%≤Si≤0.15%；0.15%≤Mn≤0.2%；

0.01%≤P≤0.016%；0.01%≤S≤0.015%；0.03%≤Al≤0.04%；

Surplus is Fe.

The invention still further relates to the manufacture method of described Steel strip for household electric appliance panel, described method comprises:

(1) hot rolling:

Hot rolling material chemical component mass content is as follows:

0.01%≤C≤0.03%；0%＜Si≤0.02%；0.1%≤Mn≤0.25%；

0%＜P≤0.02%；0%＜S≤0.025%；0.02%≤Al≤0.05%；

Surplus is Fe; Wherein also may containing micro-inevitable impurity;

Hot fine rolling finishing temperature is 870 ± 20 DEG C, and finish to gauge coiling temperature is 580 ± 20 DEG C; Next step cold rolling manipulation is carried out with after the iron scale on 7% ~ 17% chlorohydric acid pickling removing surface;

(2) cold rolling:

Employing double-stand reversible mill is rolled; This unit is equipped with a complete set of Siemens field bus control system, can realize omnidistance PLC and automatically control; Unit has complete hydraulic pressing, and hydraulic AGC controls automatically; Crew qiting plate profile instrument, adopts x-ray thickness tester, and the online high-resolution camera head observing plate surface quality, guarantees that the steel band precision that shuts out and template reach first-class level

Next step annealing operation is carried out after degreasing; Degreasing adopts vertical electrolytic degreasing unit to carry out;

(3) anneal:

Be warming up to 400 DEG C ~ 450 DEG C insulations 4 hours, then be warming up to 690 DEG C of insulations 11 hours, 335 DEG C of sprays, come out of the stove for 80 DEG C; Annealing adopts Full Hydrogen Bell Type Annealing Furnace to carry out;

(4) smooth:

Adopt 1.1% unit elongation carry out smooth, smooth roll in advance ball blast to roughness Ra=2 μm.Adopt normal flattening process to carry out, simultaneously for ensureing that plate face does not occur being pressed into because of foreign material the surface imperfection brought, unit must carry out comprehensive cleaning before manufacture.

Preferably, above-mentioned hot rolling material chemical component mass content is as follows:

0.015%≤C≤0.02%；0.1%≤Si≤0.15%；0.15%≤Mn≤0.2%；

0.01%≤P≤0.016%；0.01%≤S≤0.015%；0.03%≤Al≤0.04%；

Surplus is Fe.

The present invention selects special hot rolled strip, and composition and hot rolling technology make strict demand, and adopt the state-of-the-art double-stand reversible mill rolling in the whole world, supporting siemens electrical control system, ensure that the thickness and precision of steel band; Adopt vertical electrolytic degreasing unit to clean, ensure pan cleanliness, avoid the foreign matter press-in of plate face; Develop the specific perhydro annealing process for Steel strip for household electric appliance panel performance requriements and flattening process, the finished product detected result meet customer need target value more than 95%, become the example of technical progress of industry, promote the progress of domestic and international cold-rolled steel strip rolling technology, the starting material of high-quality are provided to downstream client.

Steel band specification of quality:

1) steel band mechanical property:

Horizontal sample is got in steel band tension test, and mechanical property need meet following table regulation:

2) slip line

Guarantee is dispatched from the factory in latter 3 months and is not occurred slip line.

3) surface quality

Steel strip surface must not scab, crackle, drawing crack, be mingled with, iron scale, iron rust and layering, blue oxidation tint and yellow film phenomenon are not allowed, allow not affect the defect of formability and painting, plating sticking power, as small bubbles, little cut, little roll marks, slightly to scratch and oxidation tint etc. allows to exist.

Beneficial effect of the present invention is mainly reflected in:

(1) hot rolling raw material Chemical Composition adopts and produces by the Composition Design of regulation, and the temperature schedule adopting three high and one low is produced in hot rolling, guarantees cold rolled annealed rear steel plate plasticity;

(2) the double-stand reversible mill rolling adopting configuration advanced, ensures thickness and precision;

(3) adopt vertical electrolytic degreasing unit to clean, ensure pan cleanliness;

Household electrical appliances high rigidity steel band of the present invention is through test of many times and the specification of quality trying out the intensity, hardness and the unit elongation that meet panel of refrigerator steel completely, be subject to enjoying great popularity of client at present, because household electrical appliances cold-rolled steel strip development prospect is boundless, therefore it has application value, and prospect is very wide.

(4) accompanying drawing explanation

The typical metallographic structure of Fig. 1 Steel strip for household electric appliance panel of the present invention.

(5) embodiment

Below in conjunction with specific embodiment, the present invention is described further, but protection scope of the present invention is not limited in this:

Embodiment 1:

(1) hot rolling:

Hot rolling raw material composition sees the following form:

Sequence number	C	Si	Mn	P	S	Al
							1	0.015	0.15	0.2	0.016	0.014	0.035
2	0.016	0.1	0.19	0.014	0.014	0.04
							3	0.02	0.13	0.18	0.013	0.013	0.038

Surplus is the inevitable impurity of Fe and trace;

Hot fine rolling finishing temperature is 870 ± 20 DEG C, and finish to gauge coiling temperature is 580 ± 20 DEG C;

(2) pickling

Coils of hot-rolled steel is through the pickling of plug-type shallow slot turbulence acid dip unit, and adopt chlorohydric acid pickling, concentration of hydrochloric acid controls at 7% ~ 17%(w/w) between, removing scale on surface.

(3) cold rolling

After pickling, coil of strip is through double-stand reversible mill rolling;

(4) vertical electrolysis unit degreasing: Faradaic current controls at about 3000A, ensures that plate face grease all washes, and adopts small tension receiving coil to batch.

(5) anneal:

Annealing adopts Full Hydrogen Bell Type Annealing Furnace, anneals by following setting technique:

Annealing process controling parameters title	Parameters controlling valu
		Steel grade	LJD-F
Thickness (mm)	0.4～0.5
		Width (mm)	930～1390
Batch (T)	80～95
		First paragraph heats up	Heating at full speed
First paragraph insulation platform (DEG C)	400～450
		First paragraph soaking time (h)	4
Second segment heating used time (h)	9
		Second segment holding temperature (DEG C)	690
Second segment soaking time (h)	11

Spray temperature (DEG C)	335
		Tapping temperature (DEG C)	80

(5) smooth:

Normal flattening process is adopted to produce, produce this type of household electrical appliances steel unit elongation and be set in 1.1%, simultaneously smooth roll in advance ball blast to roughness Ra=2 μm, batch by rewinding unit dab oil small tension receiving coil, part steel band is by customer demand spermatophore delivery after slitting line itemize.

Obtained steel band quality examination:

1) steel band mechanical property: horizontal sample is got in steel band tension test, and mechanical property is as follows:

2) slip line dispatches from the factory in latter 3 months and does not occur slip line.

3) surface quality

Steel strip surface without scabbing, crackle, drawing crack, be mingled with, iron scale, iron rust and layering, without blue oxidation tint and yellow film phenomenon.

4) metallographic structure

The obtained typical metallographic structure of 2# sample household electrical appliances steel band LJD-F is see Fig. 1, and this is organized as ferrite+free cementite, grain fineness number 8.5 grades.

Claims

1. a manufacture method for Steel strip for household electric appliance panel, described method comprises:

(1) hot rolling:

Hot rolling material chemical component mass content is as follows:

0.01％≤C≤0.03％； 0％＜Si≤0.02％； 0.1％≤Mn≤0.25％；

0％＜P≤0.02％； 0％＜S≤0.025％； 0.02％≤Al≤0.05％；

Surplus is Fe;

Hot fine rolling finishing temperature is 870 ± 20 DEG C, and finish to gauge coiling temperature is 580 ± 20 DEG C; Next step cold rolling manipulation is carried out with after 7% ~ 17% chlorohydric acid pickling;

(2) cold rolling:

Employing double-stand reversible mill is rolled;

Next step annealing operation is carried out after degreasing;

(3) anneal:

Be warming up to 400 DEG C ~ 450 DEG C insulations 4 hours, then be warming up to 690 DEG C of insulations 11 hours, 335 DEG C of sprays, come out of the stove for 80 DEG C;

(4) smooth:

Adopt 1.1% unit elongation carry out smooth, smooth roll in advance ball blast to roughness Ra=2 μm.