Galvanized steel plate product introduction

Galvanized steel plate is divided into ordinary electrolytic plate and fingerprint resistant electrolytic plate. The fingerprint resistant plate is added to the ordinary electrolytic plate on the basis of a fingerprint resistant treatment, can resist sweat, generally used in the parts without any treatment, the brand is SECC-N. Ordinary electrolytic plate and phosphating plate and passivation plate, phosphating is more commonly used, the brand is SECC-P, commonly known as p material. Passivated plates can be oiled or unoiled.

Example:

Hot dip zinc steel plate (SGCC) has one advantage over electric galvanized steel plate (SECC), SECC bending and section is very easy to rust, SGCC rust resistance under the same conditions is much better. High-quality chassis usually use SECC or SGCC galvanized steel plate, the use of this material chassis steel plate color bright, metallic luster, the advantage of this steel plate is good corrosion resistance.

Electric galvanized steel plate (SECC) : uniform gray, mainly imported, fingerprint resistance, has very superior corrosion resistance, and maintains the processability of cold rolled sheet. Uses: Home appliances, computer cases and some door panels and panels.

Hot dip zinc plate (SGCC) : Dip plated, bright white, small zinc flowers (difficult to see), large zinc flowers can be clearly seen hexagonal flower blocks. 

Main features:

Corrosion resistance, paint resistance, formability and spot weldability.

It is widely used, mainly for small household appliances that need good appearance parts, but compared with SECC, its price is more expensive, so many manufacturers use SECC to save costs.

Divided by zinc: the size of zinc flowers and the thickness of zinc layer can explain the quality of zinc plating, the smaller the thicker the better. Manufacturers can also add fingerprint resistant treatment. Also, it can be distinguished by its coating, such as Z12, which means the total amount of double-sided coating 120g/mm.

For example:

Aluminized zinc steel plate (SGLD) : It is a multiphase alloy material containing rich aluminum and zinc. Because of the characteristics of aluminum and zinc, it has better performance than hot dip zinc steel plate (SGCC). Main features: corrosion resistance, which is much higher than SGCC; Heat resistance; Heat conduction and heat reflection; Formability; Weldability. Uses: Used in some places that require good reflection, such as the reflector plate inside the oven, the reflector plate of the electric pot. Hot dip zinc steel plate (SGCC) is general use, aluminized zinc steel plate (SGLD) is deep stamping, SGCE is super deep stamping.

Quality inspection standard

The quality requirements of fine grade galvanized sheet include several aspects such as size, surface, galvanizing amount, chemical composition, plate shape, machine function and packaging.

1. package

It is divided into galvanized sheet cut to a fixed length and galvanized sheet packaging with coil. General iron packaging, lined with moisture-proof paper, with iron waist tie, tie firmly, to prevent the internal galvanized sheet friction with each other.

2. Specification and size

The relevant product scales (such as and below) specify the scale thickness, length and width of the galvanized sheet guarantee and their allowable faults. In addition, the width and length of the board and the width of the volume can also be determined according to the user's request.

3. surface

General situation: Because of the differences in the treatment methods in the plating process, the general situation of the galvanized plate is also different, such as ordinary zinc flowers, fine zinc flowers, flat zinc flowers, zinc-free flowers and phosphating disposal profiles. Galvanized sheet and galvanized coil cut to a fixed length shall not have defects that affect the use of the coil, but the coil is allowed to have less deformed parts such as welding parts.

4. Galvanized amount

Galvanizing measure value: Measuring galvanizing measure is a widely adopted method to determine the thickness of zinc layer of galvanized sheet. There are two kinds of zinc plating with the same amount on both sides (that is, equal thickness zinc plating) and two kinds of zinc plating with different amount on both sides (that is, difference thickness galvanized). The unit of galvanizing quantity is g/m2.

5. Machine function

(1) Tensile test: Generally speaking, as long as the layout, drawing and deep drawing galvanized sheet has tensile function requirements.

(2) Bending experiment: it is an important name for weighing the process function of sheet metal. However, the requirements for all kinds of galvanized sheets in the world are not the same. Generally, after the galvanized sheet is bent for 180o, the outer coating shall not have a zinc layer left, and the plate base shall not have cracks and fractures.

6. Chemical composition

The requirements for the chemical composition of galvanized substrates vary from country to country in the world. If Japan has such a requirement, the United States does not. Generally do not do product inspection.

Seven. Plate shape

There are two goals for weighing plate shape black and white, namely flatness and sickle bend. The flatness of the plate and the maximum allowable value scale of the sickle bend must be defined.