JIS Stainless Steel Square Pipe For Roofing 5MM SS440 430 Cold Rolled

The 400 Series of stainless steels

The 4xx class of stainless steels are alloyed with chromium and are ferritic or martensitic in structure. 440 steel actually refers to four types of steel: 440A, 440B, 440C and 440F steel, which only differ based on the level of carbon in their composition. All types of 440 steel are popular choices, but 440C steel is the most popular of the four, as it has the highest hardness. Below are the chemical

compositions of each type:

Common elements across all 440 steels:16-18% chromium,1% Manganese,1% silicon,0.75% Molybdenum,0.04% Phosphorus,0.03% sulfur,Some percentage of Carbon

440A steel

0.6-0.75% Carbon

440B steel

0.75-0.95% Carbon

440C and 440F steels

0.95-1.20% Carbon

All 440 steels are hardenable, meaning they gain additional strength via heat treatment, and they are considered a high carbon alloy steel. When strengthened using this process, 440 steels are the hardest of all the stainless steels, making them both abrasion-resistant as well as corrosion-resistant. When in its soft “annealed” state, 440 steel is easily worked, machined, and manipulated into shape, where it can then be hardened and gain the increased strength for which it is known.

Stainless Steel Square Pipe Specification