What screws made of austenitic stainless steels are available?
Austenitic stainless steels play a significant role in fastening technology / screw connections. The fasteners used in our products are selected in at least the steel grade A4. What these and other abbreviations mean will be explained in more detail below.
Short designations and classification of austenitic stainless steels
Example: "A4-70"
| A | 4 | 70 |
|---|---|---|
| Short designation of the steel group: A = austenitic stainless steel | Short designation of the steel type: 1 = Free-cutting steel 2 = Cold-stretched steel alloyed with chromium and nickel 3 = Cold-stretched steel alloyed with chromium and nickel and tempered with tantalum, niobium, and titanium 4 = Cold-stretched steel with chromium, molybdenum, and nickel 5 = Cold-stretched steel with chromium, molybdenum, and nickel and tempered with tantalum, niobium, and titanium | Indication of tensile strength: 50 = 1/10 of the tensile strength (min. 500 N/mm²) 70 = 1/10 of the tensile strength (min. 700 N/mm²) 80 = 1/10 of the tensile strength (min. 800 N/mm²) |
| Steel group / steel grade | Material number |
| A1 | 1.4300 1.4305 |
| A2 | 1.4301 1.4303 1.4306 |
| A3 | 1.4306 1.4550 1.4590 |
| A4 | 1.4401 1.4404 1.4306 |
| A5 | 1.4436 1.4571 1.4580 |
The steel grade A1 is particularly well machinable due to its high sulfur content but has lower corrosion resistance than the other steels .
The grade A2 is the most commonly used. However, they are not suitable for applications with non-oxidizing acids or chloride-containing media.
A3 steels have the same properties as A2 steels, but they are stabilized with titanium, niobium, or tantalum. This improves corrosion resistance at high temperatures.
A4 steels have the same properties as A2 steels. However, they are alloyed with molybdenum, which significantly improves corrosion and acid resistance.
The A5 steels have the same properties as A4 steels. However, they are stabilized with titanium, niobium, or tantalum, making them resistant even at high temperatures.
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