Obviously you know stainless steel but did you know what stainless steel is actually used for in the food industry?
Here we will explain what stainless steel material is and how we divide it, I also attach some photos of what stainless steel plate looks like before processing. Well, it’s a piece of sheet coated with foil from which we can make bars, kitchens, food dispensers, buffets…
NEREZ – is a corrosion-resistant (stainless) steel is a kind of steel whose main required property is corrosion resistance. It is an alloy of chromium, nickel and iron, which has a content of 10.5-30% and a number of other austenite-forming elements, e.g. carbon, manganese, nitrogen, copper.
The breakdown of corrosion resistant steels:
There are many types of stainless steels that differ in their resistance to corrosion caused by certain agents. According to the chemical composition, corrosion-resistant steels are divided into ferritic, martensitic, austenitic, and austenitic-ferritic.
Ferritic
These steels are magnetic and sufficiently ductile. The higher chromium content increases their corrosion resistance, which is higher than that of martensitic steels in oxidizing environments. Applications are in the chemical industry, nitric acid environments, transportation, air conditioning, architecture. They are unsuitable in welded structures.
Martensitic
Corrosion resistance is low and their resistance decreases with increasing temperature. Resistance to atmospheric corrosion is only sufficient in very clean atmospheres.
Austenitic
They have the highest corrosion resistance of all the basic grades, which can be increased by the addition of molybdenum and copper. The ductility and toughness are important properties.
Austenitic-ferritic (duplex)
They are derived from the classic austenitic steels by increasing the chromium content and reducing the nickel content. The steels then have some special properties. Welding is more difficult.
Mechanical properties and steel grade:
| EN 10088 | by AISI | Slip limit – Re min. / max. | Strength limit – Rm min. / max. | Ductility – A80 min. % |
|---|---|---|---|---|
| 1.4301 | 304 | 230 – 260 | 540 – 750 | 45 |
| 1.4307 | 304L | 220 – 250 | 520 – 700 | 45 |
| 1.4401 | 316 | 240 – 270 | 530 – 680 | 40 |
| 1.4436 | 316 | 240 – 270 | 550 – 700 | 40 |
| 1.4404 | 316L | 240 – 270 | 530 – 680 | 40 |
| 1.4435 | 316L | 240 – 270 | 550 – 700 | 40 |
| 1.4571 | 316Ti | 240 – 270 | 540 – 690 | 40 |
| 1.4541 | 321 | 220 – 250 | 520 – 720 | 40 |
| 1.4016 | 430 | 260 – 280 | 450 – 600 | 20 |
Surface quality:
| EN | DIN | AISI | Appearance | EN |
|---|---|---|---|---|
| 1D | a | 1 | xx xxx.2 | metallic pure |
| 2B | IIIc | 2B | xx xxx.4 | matt glossy |
| 2R | IIId | BA | xx xxx.5 | mirror glossy |
| 2G | IV K | 240 | Grinded | |
| 2J | V | SB | brushed |
