What are the types of light steel keel in Australia?

What are the types of light steel keel in Australia?
　　Australian light steel keel has ceiling keel and partition keel according to its purpose,and V-shaped,C-shaped,T-shaped,L-shaped,and U-shaped keel according to its cross-sectional form.
　　The marking order of Australian light steel keel is:product name,code,width and height of cross-sectional shape,thickness of steel plate,and standard number.The suspended ceiling keel with a cross-sectional shape of"C",a width of 50mm,a height of 15mm,and a steel plate thickness of 1.5mm is marked as:DC50×15×1.5 GB11981 for building light steel keel.
　　The appearance quality of the light steel keel should be flat,with clear edges and corners,and the cut should not have burrs or deformations that affect its use.The galvanized layer shall not have defects such as peeling,bulging,or peeling.For defects such as corrosion,damage,black spots,and pitting,when tested according to the prescribed methods,they should comply with the provisions in Table 2-81.When inspecting the appearance quality,a visual inspection should be carried out under bright lighting conditions at a distance of 0.5m from the product.
　　The surface of Australian light steel keel should be galvanized for rust prevention,and the double-sided galvanizing amount should not be less than 120g/m*m for high-quality products
　　Baked lacquer keel
　　The painted keel is made of fire-resistant galvanized sheet,which is durable and long-lasting.Adopting an economical placement structure,special connection methods,and combined loading and unloading.Convenient,time-saving,and simple construction.The surface of the keel is made of galvanized steel plate,which has been baked and painted.
　　The difference between light steel keel and painted keel is that general light steel keel does not undergo surface coating treatment,only coating(galvanized),while the surface of painted keel has been painted,generally black and white,and a few are baked into other colors according to design requirements.This is mainly because painted keel is mostly used for exposed keel,and painted is to ensure that the exposed parts do not rust and do not affect the appearance.
　　Open frame keel
　　Flat series,groove series,three-dimensional groove series.Concealed Keel:Flat Series
　　The overall flat effect of the painted keel is good,with simple lines and beautiful and generous appearance.The painted keel is safe,sturdy,and aesthetically pleasing,suitable for supporting construction of various mineral wool ceilings,aluminum square ceilings,calcium silicate boards,and other materials.
　　Australian light steel keel has the advantages of light weight,high strength,waterproof,fireproof,shockproof,soundproof,sound-absorbing,and other functions.At the same time,it also has the advantages of short construction period and simple construction.It is a new type of ceiling decoration material,widely used in shopping malls,hospitals,banks,hotels,factories,waiting buildings,etc.
　　The main specifications of the partition keel are Q50,Q75,and Q100.
　　The main specifications of ceiling keel are D38,D45,D50,and D60.