BMP Z21 PPGI Rolled Steel Coil for Roofing Constrution

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100 m.t.
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30000 m.t./month

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Structure of BMP Z21 PPGI Rolled Steel Coil for Roofing Constrution

 BMP Z21 PPGI Rolled Steel Coil for Roofing Constrution

Description of BMP Z21 PPGI Rolled Steel Coil for Roofing Constrution

Cold rolled steel coil is steel that has been worked below its recrystallization temperature by passing it between a pair of rollers. Recrystallization temperature is the temperature at which grains in the lattice structure of the metal have been rearranged, leaving it free of strain and deformations. Cold rolled steel coil is pre-treated before being cold rolled with a process known as pickling, which uses strong acids to remove scale and other impurities. The cold rolled steel coil is then passed through rollers to reduce its thickness. Most cold rolling takes place in multiple passes and as the size of the cold rolled steel coil is further reduced, its strength and hardness both increase, but its ductility decreases. After cold rolling, heating the metal up in a process known as annealing can restore some of its ductility. The final cold rolled steel coil may be manufactured in the form of sheets, strips, bars, or other forms.

BMP Z21 PPGI Rolled Steel Coil for Roofing Constrution


Main Feature of BMP Z21 PPGI Rolled Steel Coil for Roofing Constrution

The construction industry: The roof structure, keel, grill, Clapboard, ceilings, fire shutter doors, etc; The light industry, the Automobile, agriculture, animal husbandry, fishery, casing of household Electronic application, civilian smoke stack, etc. 


Applications of BMP Z21 PPGI Rolled Steel Coil for Roofing Constrution

1. Base metal for coated and dipped products.

2. Home appliance

3. Precise welding tube

4. Flux cored welding wire

5. Bicycle, battery shell,

6. Automobile fitting, hardware

7. Enameling industry etc.

  BMP Z21 PPGI Rolled Steel Coil for Roofing Constrution

Specifications of BMP Z21 PPGI Rolled Steel Coil for Roofing Constrution


ASTM  A653,   JIS    G3302,   GB/T3830-2006


SGCC, DX51D, A653, SGCH, Q235B





Base  metal

Galvanized  steel  coils,     Alumzinc  steel  coils, color coated steel coils

Zinc  coating


Coil  ID



Standard seaworthy export packing: 3 layers of packing, inside is kraft paper, water  plastic film is in the middle and outside GI steel sheet  to be covered by steel strips with lock, with  inner coil  sleeve.


Within  10-30days  after  signing    contract


FOB&   CNF&   CIF    price

Payment  terms

TT  or  LC,   Western  Union


1000MT  per   month




construction, the  manufacturing  of    cars,   ships,   containers  and    household  electric  appliances,other  industries  usage.


FAQ of BMP Z21 PPGI Rolled Steel Coil for Roofing Constrution

We have organized several common questions for our clients,may help you sincerely: 

1.Do you have QC teams?

Yeah, sure, our QC team is very important, they will keep the quality control for our products.

2.Are the products tested before shipping?

Yes, all of our PPGI and GI was qualified before shipping. We test every batch every day.

3.What's your normal delivery time?

Our delivery time about 15-20days for standard sizes, if you have other requirements like hardness, quanity and width ,it is about 20-40days. But don't worry ,we also try our best for the delivery time ,because time longer and our cost is higher.


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Q:How can the outer diameter and weight of steel coil be converted?
To obtain the outer diameter of the steel coil is calculated according to the density of 7850, according to the density, in general, hot-rolled is 0. 96~0, 98, cold rolled, according to 0. 98~0. Ninety-nine
Q:why do ships of steel float?
Concrete boats also float, Capt Johns link explains that. It is area + weight + volume. Displacement. Buoyancy is achieved by Displacing fN or X.
Q:A question about steel.....?
steel has carbon in it instead of just iron there are hundreds if not thousands of different kinds of steel for different applications strength depends on the definition. some have stronger tensile (pull) strength than others.
Q:which is heavier: concrete or steel?
Steel is heavier than concrete for the same volume, however steel buildings are generally lighter. This is because steel buildings utilize high strength of steel, so volume of steel in steel buildings is much smaller than volume of concrete in concrete buildings. In another words in steel buildings much less volume of material is needed for the same strength compared to concrete buildings.
Q:What is purpose of providing steel in compression zone in Doubly reinforced beam ?
There are several reasons to add compression steel. Keep in mind, supported steel (meaning it can't buckle) resists compression as well. Compression steel helps reduce long term deflections. Concrete creeps under sustained loads. Steel lessens the compression, meaning less sustained compressive stress to cause creep deflection. It makes members more ductile. Since the steel takes some of the compressive stress, the compression block depth is reduced, increasing the strain in the tension steel at failure, resulting in more ductile behavior (the moment at first yield remains largely the same with compression steel added, but the increase in capacity after yield is significant). Compression steel insures that the tension steel yields before the concrete crushes, meaning it helps change the failure mode to tension controlled. It makes beams easier to construct. With bars in the top and bottom, you have longitudinal reinforcement in all 4 corners of the shear stirrups to keep them in place when pouring the concrete. Also, for continuous members, its often easier to run your negative moment steel the full length of the beam rather than trying to cut it off in the positive moment regions. Serviceability concerns. You're going to end up putting steel in that region anyway to for temperature and shrinkage.
Q:Why do we galvanise steel?
We galvanize steel to protect and prevent steel from rusting or corrosion. Rusting, for the most part is a layman's term that has been used exclusively to describe the chemical OXIDATION reaction of steel or iron with oxygen forming a reddish brown substance called rust. Zinc metal coating also oxidizes but does not form the reddish brown rust. Instead, it forms an oxide, just like the rust, which is iron oxide. The protection created by zinc is because it is more reactive to oxidizers, than steel or iron. Thus, the oxidizer will react with Zinc first before it will react with Iron, hence protecting iron. If the zinc is fully reacted then iron is next. BUT, the zinc oxide formed on the surface of the steel or iron is no longer reactive to oxygen and also creates a good physical barrier so that oxygen will not have chance to even have contact with the underlying steel. Isn't that neat! Here is chemistry at one of its useful best.
Q:Steel question?
In your choices carbide steels are used for milling and drilling purposes and high speed steel are used in lathe operations. For shaping the tools, tool grinding machines are used and for initial sharing dyes are used.
Q:Stainless steel can be used to do??
Stainless steel can be used to (1) industrial use stainless steel (2) building decoration use stainless steel;(3) medical equipment (4) life with stainless steel tableware and the Jawaysteel is a great Chinese company, offer various kinds of stainless steel Maybe you can to their advice
Q:How can I tell the difference between different knife steels?
So what does all that mean in the real world of knives. 420 has very low carbon by blade standards, as such it is just junk steel. There are three grades of 440, A, B and C. The amount of carbon in A is about half of what C has. (carbon is what makes steel get hard). Iron is very much like a sponge in that it can absorb and hold different alloys. These alloys give the iron different attributes, and they can magnify each other. Like a sponge iron can only hold so much, for Chromium it is around 13%. At that point the steel becomes stainless. The drawback is a loss of strength. As a bladesmith my knives are generally 59 to 60 rch, 420 and 440 at its hardest is 59 but at that it is brittle so most makers draw it down to around 57. In my test a knife made of 420 couldn't make 5 slicing cuts through rope (most couldn't make one). 440 averaged between 5 and 10. Compared to the lowest grade of carbon steel I use (5160) which average between 25 to 30 on the same rope. I have tested many stainless blades and the rule always the same, the more chromium past 13% the weaker the blade and the less edge holding ability.
Q:Fallout 3 broken steel question?
Broken Steel fixes the original ending of the game so that you can continue past the end and continue exploring. The Broken Steel missions also take place after the original ending of the game. One way you can tell if Broken Steel is working though is if you are finding enemies added with Broken Steel (Super Mutant Overlords, Hellfire Enclave Troops, and so on), and if you can level up past level 20 and get new perks added between 20 and 30. You can even see all of these new perks any time you level up, so next time you level up, scroll down and see if there are new perks below the level 20 perks. If there are, then Broken Steel is working properly.

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