Stainless steel refers to a group of steel that is highly resistant to corrosion. Corrosion resistance can be attributed to chromium-rich oxide film that forms on its surface, which is also referred to as a “passive layer.”
‘Modular Stainless steel’ (Also known as ‘เหล็กกล้าไร้สนิมแบบแยกส่วน‘ in the Thai language) is used in everything from the large architectural structure into a small seat.
While the anti-corrosive benefit from an iron-chromium alloy known as far as the early 19th century by the French metallurgy Pierre Berthier, it was not until the early 20th century when it produced only with the right properties.
Stainless steel is generally divided into four types:
The simplest composition containing iron and chromium, which is referred to as ferritic stainless steels, as they are called ferrite crystal structure.
It is a magnet, and is used in products such as car trim and dishwashers. They are generally the cheapest form, but it comes with disadvantages too, such as welding and forming difficulties.
The most common group of stainless steel, austenitic micro is derived from the addition of nickel, manganese and nitrogen. Unlike ferritic, its structure is ideal for welding and forming.
Martensitic more commonly found in the product longer than in the sheet and plate forms, and they have generally low weldability and formability. Examples are the use of martensitic steel cutlery and valve parts.
Duplex steel structure is about 50 percent of ferritic and austenitic, which gives them a higher power than the one of their steel. They are resistant to stress corrosion cracking and weldable and magnetic. Duplex may be used in pipes and architectural structures.