Stainless steel screws are widely used because of their good mechanical properties such as anti-rust, anti-corrosion, high temperature resistance, etc. And you can see stainless steel screws everywhere in your daily life, for example, in medical equipment, electronic products, instruments and meters, food machinery. Today we come together to understand the stainless steel screw grade related to the introduction, see this usually our common things in the end what are the special features?
What are the grades of stainless steel screw strength
Stainless steel material classification are: austenitic stainless steel (18% Cr, 8% Ni), martensitic stainless steel, ferritic stainless steel. Austenitic stainless steel heat resistance, good corrosion resistance, good weldability.A1, A2, A4 martensitic stainless steel, 13%Cr corrosion resistance is poor, high strength, good wear resistance.C1, C2, C4 ferritic stainless steel, 18%Cr upsetting forging is better, corrosion resistance is stronger than martensitic.
Currently on the market according to the level of stainless steel materials are mainly divided into 201, 304, SUS304, SUS316.
201 carbon content is high, not more than 0.15%; 304 in the carbon content of not more than 0.08%;
201 manganese content of 7.5%, 304 in manganese content of 2%;
201 in Cr content 16%~18%, 304 Cr content of 18%~20%;
201 nickel content of 3.5-5.5%, 304 nickel content of 8-12%;
201 steel yield point of 275MPa, tensile strength ≥ 520MPa, elongation rate of 40%
304 steel yield point of 205MP resistance ≥ 515Mpa elongation rate of 40%
304 steel yield point of 205MP resistance ≥ 515Mpa elongation 40%
After annealing, the strength of 201 is higher than 304, corrosion performance 201 is lower than 304
The most fundamental difference between the two is the difference in nickel content, corrosion rate difference of dozens of times, the overall is the ability of the 304 rust >201, such as 201 stainless steel rust in water after some time, 304 has no effect on the water, but encountered the acid and alkali will be Rust, 316 can be used in acid and alkali environment.
Performance level: stainless steel is divided into 60,70,80 (austenitic); 50,70,80,110 (martensitic); 45,60 (ferritic) three categories. Stainless steel standard parts characterized by corrosion resistance, beautiful, sanitary, but its strength, hardness under normal circumstances equivalent to carbon steel (6.8 level).
The above is about stainless steel screws strength level of the division of the introduction, I do not know if you are with the editor as much benefit? Seemingly ordinary things, but there are so many special features, in fact, in the purchase of stainless steel screws is also a skill, such as you have to consider from the mechanical properties, corrosion resistance, and even heat resistance, so that you can buy the most suitable stainless steel screws for your use.
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