July 2, 2022
(1) The classification and code of performance levels shall be in accordance with the provisions of Table 1.
Table 1 Performance classification and code
Level Performance Level Code Application scope
General Use 01
Mechanical bite 02 zinc layer weight code shall not exceed Z350
Stamping 03 thickness range ≥0.4mm zinc layer weight does not exceed Z275
Deep drawing 04
Special killed steel deep drawing 05
Unaged ultra-deep blanking 06
Structure 220, 250, 280, 320, 350, 400, 450, 550 thickness & LT; 0.4mm steel plates are not suitable for class 220, 250, 280 and 320
(2) The type and code of substrate shall be specified in Table 2.
Table 2 Types and codes of substrates
Type code of substrate
Cold rolled coil plate
Hot rolled pickling coil H
(3) The classification and code of double-sided equal thickness galvanized layer and coating weight shall be in accordance with the provisions of Table 3. Steel plate and strip with coating weight not listed in Table 3 can also be provided by agreement of both parties.
Table 3 Classification and code of galvanized layer and coating weight
Galvanized layer zinc iron alloy coating
Plating weight /(g/㎡)(double-sided) code
(60) (Z60) (40) (ZF40)
80 (Z80) 60 (ZF60)
100 (Z100) 80 (ZF80)
120 (Z120) 100 (ZF100)
150 (Z150) 120 (ZF120)
180 (Z180) 150 (ZF150)
200 (Z200) 180 (ZF180)
220 (Z220)
250 (Z250)
275 (Z2750)
350 (Z350)
450 (Z450)
600 (Z600)
Note: the weight of zinc layer in brackets shall be negotiated by both parties
3.1 Differential thickness coating can be expressed as the weight of different coatings on the upper and lower surfaces, such as Z40/90 or ZF30/50, by half of the coating weight listed in Table 3. The surface appearance of low zinc layer weight may differ from that of high zinc layer weight.
(4) Classification and code name of zinc layer surface structure shall be specified in Table 4.
Due to strain test marketing, the polished steel plate and strip of grade 01~04 are leveled by an effective straightening machine before processing to avoid the occurrence of slip lines. Grade 05 or 06 polished steel plates and strips are unaged and can avoid slip lines for 6 months.
Table 4 Zinc layer surface structure and finishing surface classification and code
Surface structure code
Not just polished
Normal zinc flower N NS
Small zinc flower M MS
Zinc free flower F FS
Zinc ferroalloy ZF ZFS
(5) The classification and code of surface quality shall be in accordance with the provisions of Table 5.
Table 5 Surface quality classification and code
Surface quality code
Ordinary surface FA
Higher surface FB
Advanced surface FC
(6) The classification and code of surface treatment shall be in accordance with the provisions of Table 6.
Table 6 Classification and code of surface treatment
Surface treatment symbol
Passivation C
Unction O
Paint sealant L
Phosphating P
Don't deal with U
6.1 passivation
The zinc coating can be passivated to reduce the rust (white rust) in the condition of wet storage and transportation. However, the corrosion resistance of this chemical treatment is limited and, moreover, hinders the adhesion of most coatings. This treatment is generally not in the zinc iron alloy coating, in addition to the finishing surface, as a general, the production plant on other types of galvanized layer are passivation treatment.
6.2 oil
Oiling can reduce the corrosion of steel plate under wet storage condition, and oiling the passivated steel plate and strip will further reduce the corrosion under wet storage condition. The oil layer should be able to be removed with a degreaser that does not damage the zinc layer.
6.3 paint sealant
An additional corrosion protection, especially fingerprint resistance, is provided by applying an extremely thin transparent organic coating film. Lubricity can be improved when forming, and as the adhesion bottom of the subsequent coating.
6.4 phosphating
Through phosphating treatment, the galvanized steel plate of various coating types can be coated without further treatment in addition to normal cleaning. This treatment can improve the adhesion and corrosion resistance of the coating and reduce the risk of corrosion during storage and transportation. After phosphating, it can be used with suitable lubricant to improve the molding performance.
6.5 does not handle
Plates and strips supplied in accordance with this standard may not be passivated or oiled or coated or coated or phosphating only if the orderer so requests and is responsible for such non-treatment.
