heat resistant roofing sheets made in China

what is raw materials for corrugated matel iron steel sheet?  how to make it ?          

the Raw materials for corrugated steel sheet include three kinds as below:

1) galvanized steel                              zinc coating from 60g/m2 to 150g/m2 

2) galvalume steel( Aluzinc steel)         AZ30 to AZ150 

3) prepainted steel ( color coated steel)  

     top side 18-25micro; back side 5-10micro

     color: top side can be made as RAL Code

produce process:

step 1). cold rolled steel coil------

step 2). galvanized steel coil or galvalumed steel coil ---------

step 3). prepainted steel coil --------

step 4). cuting steel coil into steel sheet----------

step 5). rolling steel sheet in to corrugated sheet

what is mainly specification for corrugated iron sheet ??                                         

Thickness:0.12mm to 1.0mm 

Width:610-1000mm(after corrugation);

Raw material width 762mm to 665mm(after corrugated) 

Raw material width 914mm to 800mm(after corrugated) 

Raw material width 1000mm to  900mm(after corrugated) 

Raw material width 1200mm to  1000mm(after corrugated)  

Wave height:17-18mm

Wave distance/pitch: about 76mm

number of waves:9-12

How to package corrugated matel sheet???                                                          

waterproof paper, galvanized steel covered and steel strip packed. 

In order to count piece numbers easily, uaully we put every 20 pieces branch off another 20 pieces. such as pictures below. 

Our products are widely used in such fields as construction, transportation, chemical engineering,

household appliance, lighting and building materials,having a promising market prospect.Till now,we have supplied quality products to customers in West Europe, South America,the Middle East and Africia

Your orders are welcomed!