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Stainless Steel Roof Sheeting

3CR12 Stainless Steel Roof Sheeting

South African developed 3CR12 is recognised as the original chromium utility ferritic stainless steel.

3CR12 was developed as an alternative material where the mechanical properties, corrosion resistance and fabrication requirements of other materials such as mild steel, galvanised, aluminium, or pre-painted steels are unsuitable.

3CR12 is a corrosion resisting steel and, as such, will exhibit staining when exposed to aggressive atmospheric conditions. In applications where aesthetic appearance is important, it is recommended that the 3CR12 be painted or that a stainless steel such as 304 be used.

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316 Stainless Steel Roof Sheeting

316 is an improved version of 304 due to the addition of molybdenum and a slightly higher nickel content. The resultant composition of 316 gives the steel improved corrosion resistance in many aggressive environments. The molybdenum makes the steel more resistant to pitting and crevice corrosion in chloride-contaminated media, seawater and to acetic acid vapours. The lower rate of general corrosion in mildly corrosive environments gives the steel good atmospheric corrosion resistance in polluted marine atmospheres.

316 offers higher strength and better creep resistance at higher temperatures than 304. 316 also provides excellent mechanical and corrosion properties at sub-zero temperatures. When there is a danger of corrosion in the heat-affected zones of weldments, the lower-carbon variety 316L should be used.

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304 Stainless Steel Roof Sheeting

304 is the most versatile and widely used of all stainless steels. Its chemical composition, mechanical properties, weldability and corrosion/oxidation resistance provide the best all-round performance stainless steel at relatively low cost. It also has excellent low-temperature properties and responds well to hardening by cold working. If the potential for intergranular corrosion in the heat-affected zone exists, 304L is recommended.

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