〣Performance index and bending test of galvanized coil

Generally speaking, only structural, tensile and deep drawing galvanized sheet have tensile performance requirements. The structural galvanized sheet requires yield point, tensile strength and elongation. Only elongation is required for stretching. Test method: The same as the general test method of thin steel plate, bending test: bending test is the main project to measure the process performance of sheet metal, but the national standards for all kinds of galvanized sheet requirements are not consistent, except structural grade, the rest are not required to bend and tensile test. In Japan, bending tests are required except for structural grade, architectural corrugated plate and general corrugated plate. Requirements: The general requirements of galvanized sheet bending 180, the outer surface shall not be separated from the zinc layer, the plate base shall not have cracking and fracture.

〣Galvanized sheet

Galvanized sheet is a steel plate coated with zinc. Is to prevent corrosion on the surface of the steel plate to prolong its service life, coated with a layer of metal zinc on the surface of the steel plate, is a kind of economic and effective rust prevention method, the zinc coated steel plate is called galvanized plate, galvanized coil plate and divided into no zinc flowers, small zinc flowers and zinc flowers.

〣Small zinc flower civilian galvanized sheet

Zinc flower diameter 1~2mm zinc flower called small zinc flower. When the hot galvanized sheet comes out from the zinc pot, to the zinc layer without solidification spray or zinc powder, a water drop, a zinc powder particles will form a crystallization center, so that the unit area of zinc flowers increased and became smaller, so the galvanized surface will form with the naked eye can distinguish small zinc flowers, traditionally the product produced by this process is called small zinc flowers. Because this process often causes uneven zinc flowers, uneven surface color, and high production cost, so this process is not used much.

〣Polished zinc galvanized sheet

Large zinc flowers are not allowed to enter the finishing process. Small zinc flower or no zinc flower products through the finishing process, known as finishing zinc flower. This plate through the light of the galvanized sheet polishing machine, the galvanized sheet surface of the zinc flower flat is mainly used for color coated coil plate.

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