PPGI PPGL coil maufacturer with ral colors , produced by astm a36 standard , with differnt shape for you choose

PPGI PPGL steel coil $ sheet  production process

PPGI PPGL Color steel plate (also known as: color plate, color coated steel plate) is a product made of galvanized or galvalume steel plate as the substrate, which is subjected to surface pretreatment (degreasing, cleaning, chemical conversion treatment), coated with paint in a continuous method (roller coating method), and baked and cooled. Then we cut it into sheet and put it into roofing machine accoding to your shape and size requirement.

The coating structure includes two coatings and one baking, two coatings and two baking, etc. BOMIS maintenance-free service life can be 10-30 years depending on the ambient atmosphere.

Prepainted Color coated steel roofing sheet is a product made of cold rolled steel coil, aluzinc or galvanized steel plate as the substrate, after surface degreasing, phosphating, chromate treatment, coated with organic coating and baked. The commonly used coatings for color coated steel plates are polyester (BHP XRW coating system, Baosteel JZ, South Korea PGS, Taiwan PE), followed by silicone resin (PSS), fluororesin (PVDF), etc. The coating structure is divided into two coatings and one baking and two coatings and two baking. The coating thickness is generally 10-30μ on the surface and 5-25μ on the back. The standards commonly cited for color-coated steel roofing are GB/T 12754-2019 (color coated coil) ,ASTM A653A ,,GB/T2518-2008 (galvanized) and ASTM A792 (aluminum-zinc coated) in the United States, JIS G3302 JIS G3316 in Japan,  EN10346-2009 ,EN/0142 in Europe, KS D3506 in South Korea, and Q/BQB420 in Baosteel.

2. Common steel types, substrates, and coatings for color-coated steel plates

2.1. Common steel types for color-coated steel plates

In China, users are relatively less concerned about the type of steel when choosing color-coated steel plates. Because most color-coated steel plate manufacturers in China have fewer types of steel, most of them are DC51 (because the hot-rolled plates or hard-rolled coils they purchase are basically the same type of steel), some color-coated steel plate factories with hot-dip galvanizing production lines produce full-hard steel (S550) or (S350, etc.) through hot-dip galvanizing annealing, but it is very difficult because they cannot control the quality and chemical composition of the substrate. Therefore, the quality stability is poor, which leads to large performance fluctuations and causes the corrugated plate to deteriorate.

For buildings, the load bearing (wind load, snow load, construction personnel and machinery), span of the building, purlin spacing design, etc. all depend on the strength of the steel plate. For color-coated and galvanized steel plates for building maintenance structures, there are corresponding standards abroad. Such as ASTM653 and ASTM792 in the United States, JISG3302 and JISG3321 in Japan, EN10215 and EN10147 in Europe, etc. According to the major types of steel, they are divided into CQ (common commercial grade), DQ (general stamping), HSS, and FH (full hard steel).

CQ common commercial grade

Non-ferrous metal smelters (copper, zinc, aluminum, lead, etc.) are challenging the service life of color-coated steel plates. However, reasonable selection of materials, design, and environmental protection investment can guarantee or increase the service life of color-coated steel plates. Replacement or maintenance every 10 years should be possible.

DQ is generally used for stamping

Since the color plates used in general buildings are roll-formed or composite sandwich, the stamping performance requirements of the materials are not high, so they are rarely used in the construction field (except for some color plates for doors and windows).

HSS structural steel

According to the European standard, HSS can be divided into 4-5 steel grades with different strengths. However, since ordinary CQ grade materials can replace low-strength HSS steel, the steel grades with yield strengths of 280Mpa and 345Mpa are more commonly used in the market. TSTE28 and TS350GD produced by Baosteel are these two steel grades.

Compared with ordinary CQ, HSS steel has several major advantages: (1) Due to its relatively low yield strength, this type of steel has good fire resistance and earthquake resistance. (2) For thicker steel plates, it can manufacture large-span arched plates. (3) For general exterior wall and roof panel types, it can be appropriately thinner than CQ materials, thereby saving material consumption.

FH full hard steel

It is a type of steel that increases the yield strength of steel plates by controlling the annealing temperature. According to international general standards, the yield strength is ≥550Mpa and the tensile strength is ≥570Mpa. This type of material has high strength and low elongation. It is suitable for forming steel plates with shallow plate shapes and can save materials when used. Therefore, countries are competing to research and develop this type of steel. In foreign standards, materials with high strength and good elongation are also described. For example, HSLA is used to add strengthening alloy elements during steelmaking, but due to the high strength, there are restrictions on increasing the reduction rate during rolling in steel mills. Therefore, HSLA steel is rarely used as a thinner color-coated plate for maintenance structure (another disadvantage is high cost).

According to Bomis's many years of experience in using steel grades, the guarantee of the plate shape of color-coated steel plate products is closely related to the strength grade of the steel plate, the plate shape of the corrugated steel plate, and the processing machine.

In general, the more processing passes, the better the plate shape, and the slower the processing speed, the better the plate shape. For the plate shape of corrugated steel plates, the plate shape of shallow wave plates is better than that of high wave plates. For the strength of steel plates, the worse the strength of the plate shape after processing, the more obvious the trend.

2.2 Commonly used substrates for color steel plates

1) Hot-dip galvanized substrate

The product obtained by applying organic coating on hot-dip galvanized steel plates is hot-dip galvanized color-coated plates. In addition to the protective effect of zinc, the organic coating on the surface of hot-dip galvanized color-coated plates also plays a role in isolation protection and rust prevention, and its service life is longer than that of hot-dip galvanized plates. The zinc content of hot-dip galvanized substrates is generally 180g/m2 (double-sided), and the zinc coating content of hot-dip galvanized substrates for building exteriors is as high as 275g/m2.

2) Hot-dip aluminum-zinc substrate

According to requirements, hot-dip aluminum-zinc steel sheet can also be used as color-coated substrate (55% AI-Zn and 5% AI-Zn).