Home > News > Content

Cold-formed Steel Purlins For Roof And Wall

Feb 20, 2017

Introduction for steel purlins:

Cold-formed steel purlins were first introduced to replace heavier hot-rolled steel angle and channel sections,which made the cost down.

A purlin is a secondary structural member that spans between the primary/main steel frame to support the roof cladding and wall cladding.The roof purlin transfers the loading from roof cladding to the primary steel rafters.Similarly, a side purlin is a secondary structural member that spans between the primary or main steel frames to support the wall cladding and transfer the loading from the wall cladding to the primary steel columns. All the purlins provide restraint to the primary steel frame members.Cold-formed steel purlins are used as the supporter of roof and wall and used on a wide range of building types including large-scale and MID-scale construction, such as factory, warehouse, garage, exhibition center, cinema, theatre, garden and so on.

312537980_277.jpg

Manufacture of Cold-formed Steel Purlins:

Cold-formed steel C/Z purlins are made by galvanized steel strips. In the form of coils, which have been slit to the desired width from the parent or “wide coil” supplied from the mills.

mmexport1471918869876.jpg


20140120100527_71564.jpg


Advantages of Cold-formed galvanized Purlins

  • They are cost lower in comparison to heavier, hot-rolled steel angles or channel profiles

  • They have a high strength-to-weight ratio

  • Long spans of up to 15m are possible(But if imported from China,there will be limitation on container length,max 5.8m for 20GP,and 11.8m for 40GP/HQ)

  • Galvanised finish makes longer-term durability

  • Material can be delivered to site pre-punched and cut at suitable length

  • Lightweight and easy to be handled,constructed and installed

  • All the steel is 100% recyclable.



3.jpg


Image.jpg


Our specs for galvanized C purlins and Z purlins:


C  purlin sectional size range
Model NO.H×B1×B2×C(mm)Thickness(mm)Hole distance(mm)Length(m)
C8080×40×40×152.0-3.0No holesThe length can be customized,but can't be longer than11.8m.
C100100×50×50×202.0-3.040
C120120×50×50×202.0-3.0Adjustable
C140140×50×50×202.0-3.0Adjustable
C160160×60×60×202.0-3.0Adjustable
C180180×60×60×202.0-3.0Adjustable
C200200×60×60×202.0-3.0Adjustable
C220220×70×60×202.0-3.0Adjustable
C250250×70×70×202.0-3.0Adjustable
Remark:1)H,B1,B2,C,please refer to the picture above to check,thank you.
2)Because of the container size,the lenth can't be more than 11.8m.


Z  purlin sectional size range
Model NO.H×B1×B2×C(mm)Thickness(mm)Hole distance(mm)Length(m)
Z100100×55×50×202.0-3.040Max 5.8M for 20GP;
Max 11.8m for 40HQ/GP.
Z120120×55×50×202.0-3.0Adjustable
Z140140×55×50×202.0-3.0Adjustable
Z150150×67×61×202.0-3.0Adjustable
Z160160×67×61×202.0-3.0Adjustable
Z180180×67×61×202.0-3.0Adjustable
Z200200×67×61×202.0-3.0Adjustable
Z250250×78×72×202.0-3.0Adjustable
Z280280×78×72×202.0-3.0Adjustable
Z300300×78×72×202.0-3.0Adjustable


Zinc coating:60-275g/M²

Above is our regular size,some special size,customer could contact us for details.