Stainless steel usually refers to the resistance to air, water, acid, alkali salt or other media corrosion ability of steel. According to the different composition of the alloy, respectively focus on rust resistance and acid resistance.

Although some steels have rust resistance, but not necessarily acid resistance, acid resistance steels are usually rust resistance.

Used for the production of fasteners are mainly austenitic stainless steel, in People’s Daily life, often referred to as stainless steel is austenitic stainless steel.

We use stainless steel fasteners, the main raw materials are austenite 302, 304, 316 and “low nickel” 201, etc.

Use range

Mainly used in: environmental protection equipment, medical equipment, communication equipment, power facilities, electronic products, instruments and meters, food machinery, petrochemical, ship assembly, pump valve pipeline, building curtain wall, outdoor occasions, sports facilities, outdoor decoration, etc.

In daily life, stainless steel screws are very common fasteners, in the use of the process, people also found that it is easy to appear the following several problems.

First, loose problem

In the use of stainless steel screws, screw loosening is a very common problem, under a certain impact, vibration, will become subsidence, relax.

Two, blackening problem

The main reason for black stainless steel screws is that in the process of rubbing teeth or cold heading, the screw produces too much heat, and the relationship between the screw itself material will also lead to black screws, black parts mainly in the cross groove part.

Three, corrosion and rust problem

Stainless steel screws will also corrosion rust, many factors will cause stainless steel screw corrosion rust, such as air containing carbon oxide, sulfuric acid and other substances will cause screw corrosion, dust in the air, moisture will cause chemical corrosion, screw surface adhesion of organic matter, after a period of time, will also lead to screw rust.

Four, fracture problem

Usually stainless steel screws are not easy to break, leading to screw fracture is mainly because of the quality of the material itself is not good, or the processing process is unreasonable, in addition, if the user is using the screw too hard, may also lead to screw fracture.

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Stainless steel screw material selection principle:

The choice of stainless steel materials mainly from the following five aspects to consider.

1, the stainless steel screw material in the mechanical properties, especially strength requirements;

2, working conditions on the corrosion resistance of the material requirements;

3, the requirements of the working temperature on the heat resistance (high temperature strength, oxidation resistance) of the material;

4, the production process on the material processing performance requirements;

5.Other factors, such as weight, price, procurement, etc., must be taken into consideration.