Galvanized Steel Coil

Electrogalvanizing

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Hot Dip Galvanizing

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1 Low carbon and ultra-low carbon steel plates and strips

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According to application, the cold rolled low carbon steel and ultra-low carbon steel can be divided into common quality, drawing quality, deep drawing quality, extra-deep drawing quality and supreme extra-deep drawing quality. With excellent drawing and welding performance and relatively high dimensional accuracy, the cold rolled low carbon and ultra-low carbon steel plates of Baosteel have been widely applied to manufacture of various automotive parts. The interstitial free steel [IF steel] in particular has been greatly used for extremely hard drawing parts such as inner door plates, luggage boot cover plates and crankcase oil pans for its high value r, value n and percent elongation. See following table for their applications and features:

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1.1.1 Equivalent Grades

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1.1.2 Mechanical and process performances

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1.1.3 Surface quality

In view of current situation that no local steel plant could produce ultra high-grade finishing surface steel plates (O5 plates), Baosteel actively organized production and scientific research forces to tackle the problem and developed O5 plates, cold rolled superior products, first in China. Baosteel have been able to steadily supply such plates in batches to greatly meet the demands of automobile makers. At present, Baosteel’s low carbon and ultra-low carbon steel plates have been not only widely used in making internal automotive parts but applied in large quantities to outside cover parts of automobiles such as sedans and passage cars, which require high surface quality. Steel plate surface quality is classified into three grades to satisfy different application requirements. See following table.

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FB (O3): Relatively high-grade finishing surface

It is allowed for the existence of a few surface defects which will not affect forming and coating & plating adhesiveness such as minor scratch, impression, pit, roll mark and oxidation tint.

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FC (O4): High-grade finishing surface

One side of relatively good quality is free from any remarkable defect visible and the other side must reach FB requirements at least.

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FD (O5): Ultra high-grade finishing surface

One side of relatively good quality is free from any defect, namely appearance quality after painting or electrogalvanizing is not affected, and the other side must reach FB requirements at least.

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1.2 Carbon structural steel plates and strips

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Carbon structural steel plates and strips, St37-2G, St44-3G, St52-3G, are featured with good comprehensive mechanical performance (strength and percent elongation, etc.) and process performance (bending), high dimensional accuracy and excellent welding performance. They are suitable to manufacturing structural members with simple processing and may be used as some structural parts for automobiles, such as car body frames, middle base plates and various reinforcement plates.

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1.2.1 Equivalent Grades

1.2.2 Product sizes

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1.2.3 Mechanical and process performances

1.2.4 Surface quality

FB (O3): Relatively high-grade finishing surface

It is allowed for the existence of a few surface defects which will not affect forming and coating & plating adhesiveness such as minor scratch, impression, pit, roll mark and oxidation tint.

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FC (O4): High-grade finishing surface

One side of relatively good quality is free from any remarkable defect visible and the other side must reach FB requirements at least.

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1.3 High-strength phosphor steel plates and strips

High-strength phosphor steel plates and strips refer to low carbon or ultra-low carbon steel especially added with certain amount of phosphor, which increases steel strength by its solid solution strengthening function. Adoption of such plates may properly reduce thickness of automotive drawn parts thus lighten automobile dead weight. They can be used for manufacturing outside cover parts such as outside door plates, engine hood plates, top cover plates, and reinforcements and structural members such as cross beams and longitudinal beams.

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3.1 Equivalent Grades

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1.3.2 Mechanical performances

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1.3.3 Surface Quality

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FB (O3): Relatively high-grade finishing surface

It is allowed for the existence of a few surface defects which will not affect forming and coating & plating adhesiveness such as minor scratch, impression, pit, roll mark and oxidation tint.

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FC (O4): High-grade finishing surface

One side of relatively good quality is free from any remarkable defect visible and the other side must reach FB requirements at least.

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FD (O5): Ultra high-grade finishing surface

One side of relatively good quality is free from any defect, namely appearance quality after painting or electrogalvanizing is not affected, and the other side must reach FB requirements at least.

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2 Electrogalvanized Automotive plates

Electrogalvanized plates and strips made by Baosteel are featured with good erosion-resistant, high surface quality (O5 plate surfaces are available) and excellent processing and coating performances. They can be used to manufacture inside and outside automotive plates, structural parts and reinforcements. Currently, most main domestic automobile makers use electrogalvanized plates or electrolytic Zn-Ni coated plates produced by Baosteel.

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2.1 Reference list of electrogalvanized plate grades and base plate grades

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2.2 Mechanical and process performances

1) The mechanical and process performances of pure zinc coated plates/strips must comply with the stipulations of those of relevant base plates.

2) Among the mechanical performances of Zn-Ni alloy coated plates/strips, breakage percent elongation is allowed to be lowered by 2 units against that of relevant base plates, r is allowed to be lowered by 0.2 against that of relevant base plates and other mechanical and process performances shall comply with the stipulations of those of relevant base plates.

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2.3 Coating bending test

1) Steel plates and strips for drawing purposes are subject to coating bending test. No coating strips on the outside surface of a sample (at the spot over 7mm away from two edges of the sample), which is bended by 180 degrees in any direction with bending center diameter of 0a, when its two surfaces are met.

2) Steel plates and strips for cold forming purposes are subject to coating bending test. There are no coating strips on the outside surface of a sample (at the spot over 7mm away from two edges of the sample), which is bended by 180 degrees in any direction. Refer to provisions of relevant base plates for bending center diameter and take 0a as the bending center diameter in case of no requirements by the base plates for it.

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2.3 Surface Quality

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FB (O3): Relatively high-grade finishing surface

It is allowed for the existence of a few surface defects which will not affect forming and coating & plating adhesiveness such as minor scratch, impression, pit, roll mark and oxidation tint.

FC (O4): High-grade finishing surface

One side of relatively good quality is free from any remarkable defect visible and the other side must reach FB requirements at least.

FD (O5): Ultra high-grade finishing surface

One side of relatively good quality is free from any defect, namely appearance quality after painting or electrogalvanizing is not affected, and the other side must reach FB requirements at least.

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2.4 Surface treatment

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Chromate treatment (C): This surface treatment can reduce white rusts formed on product surfaces during transportation and storage.

Chromate treatment + oiling (S): This surface treatment can further reduce white rusts formed on product surfaces.

Phosphate treatment (with seal treatment) (P): This surface treatment serves as preparation for further surface painting and has some lubrication function. Also, it can reduce white rusts formed on product surfaces.

Phosphate treatment (with seal treatment) + oiling (O): This surface treatment can reduce white rusts formed on product surfaces and improve formability of steel plates.

Phosphate treatment (without seal treatment) (T): This surface treatment can reduce white rusts formed on product surfaces.

Phosphate treatment (without seal treatment) + oiling (V): This surface treatment can reduce white rusts formed on product surfaces and improve formability of steel plates.

Oiling (O): This surface treatment can reduce white rusts formed on product surfaces. However, it normally does not used as rolling oil and drawing lubrication oil for post processing.

No treatment (M): No treatment tends to the forming of white rusts on steel plate and strip surface. If the user requires such method, it shall be indicated in the orders.

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3 Hot Dip Galvanized Automotive Plates

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Hot dip galvanized plates (coils) of Baosteel are featured with strong coating adhesiveness, high erosion-resistance, accurately controlled zinc coating thickness, high size precision, flat profile and good mechanical, processing and welding performance. They can be used for making outside and inside automotive plates, structural parts and reinforcements. Great quantities of them have been used by main domestic automobile makers.

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3.1 Applications and features are given as following table

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3.2 Mechanical performances and coating adhesiveness

1) Steel plates and strips shall comply with the provisions of Table 4, Table 5 and Table 6 in terms of mechanical performances and coating adhesiveness.

2) The tensile samples are horizontal ones. Yield strength RP0.2is taken in case of indistinct yield, and ReL is taken for the drawing and cold forming steel in case of distinct yield. ReH is taken for the structural steel.

3) There are no coating strips on the outside surface of a sample, which is bended by 180 degrees, with the exception of the parts within 5mm from either edge of the sample. For Zn-Fe alloy products, it is allowed for the existence of hair cracks or surface roughing on the outside surface of a sample. The coating bending test samples are longitudinal or horizontal ones.

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3.3 Coating weight range

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3.4 Surface structure

Chromate treatment (L): Chromate treatment is a chemical treatment with an aim to prevent white rusts formed on product surfaces during transportation and storage.

Oiling (Y): Oiling is to prevent white rusts formed on product surfaces during transportation and storage.

Chromate treatment + oiling (LY): This treatment with oiling after surface chromate treatment is to further avoid the forming of white rusts.

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3.5 Equivalent Grade

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