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Stainless steel fastener mainly uses stainless steel wire rod as raw material, and then according to the steps of production standard parts, a series of processes such as butting, etc., using stainless steel to manufacture fastener products, has been very popular. Stainless steel fasteners have the following major properties:
1、 High temperature resistance of stainless steel fasteners. As the hardness of stainless steel itself is relatively strong, the fastener after production has a strong anti-oxidation ability, and can not work normally under high temperature, and will not be affected by too much high temperature interference. If passivation can be carried out at the same time after manufacturing, the effect will become better.
2、 The physical properties of stainless steel fasteners have a relatively high electro negative rate. Compared with carbon steel wire rod, we can see that the electro negative rate of stainless steel fastener is five times higher than that of carbon steel. There is a coefficient of expansion in the standard parts. Through the test, we know that if the temperature is higher, the expansion coefficient of stainless steel fasteners will be increased to a certain extent.
3、 For stainless steel fasteners, the load they can bear is in comparison. Although they cannot be compared with high-strength bolts, they also meet the needs of normal people.
4、 Mechanical properties of stainless steel fasteners. In terms of mechanical properties, we can know that many of them are closely related to stainless steel wire rod. For example, non rusting and high corrosion resistance are closely related to the properties of stainless steel. With the continuous development of standard parts, these mechanical properties are becoming stronger and stronger.
Fasteners are characterized by a wide variety of specifications, different performance uses, and a high degree of standardization, seriation and generalization. The materials commonly used to manufacture fasteners are carbon steel, low alloy steel and non-ferrous metal.
According to the material of stainless steel, it can be divided into (1) standard austenitic stainless steel (2) martensitic stainless steel (3) ferritic stainless steel (4) precipitation hardening stainless steel
Among them, the standard austenitic stainless steel we call is commonly used in four grades: 302, 303, 304 and 305, namely the so-called "18-8" austenitic stainless steel. Both corrosion resistance and mechanical properties are similar. The starting point of selection is the process method of fasteners, which depends on the size and shape of fasteners, as well as the quantity.
Type 302 is used for making screws and self tapping bolts.
In order to improve the performance, 303 type is mainly used for standard nuts.
Type 304 is suitable for the use of warm heading process, such as longer specifications of bolts, large diameter bolts.
The model 305 is applicable to fasteners manufactured by cold heading process, such as cold formed nuts and hexagon bolts
Type 309 and 310 have higher chromium content and nickel content than type 18-8 stainless steel, which are suitable for fasteners manufactured at high temperature.
Type 316 and 317 both contain manganese, so their high temperature strength and corrosion resistance are higher than type 18-8 stainless steel.
321 and 347, 321 contain relatively stable alloy element titanium, 347 contain niobium, which improves the intergranular corrosion resistance of the material.