China fasteners encounter condensation in contaminate […]
China fasteners encounter condensation in contaminated air, contamination refers to the presence of large amounts of sulfide or carbon dioxide, which will constitute sulfuric acid and hydroxide when encountering water, and chemical corrosion of stainless steel fasteners.
Chinese fasteners will rust because the protective film of stainless steel is damaged, stainless steel is oxidized, and the ability to resist rusting is weakened, so stainless steel fasteners will also rust.
Half-round heads stainless steel fasteners whose tensile strength grows more uniformly in the temperature range of 15 to 80°C.
The impact toughness of stainless steel fasteners decreases slowly as the temperature decreases, and there is no brittle transition temperature. Therefore, stainless steel can maintain sufficient plasticity and toughness at low temperatures.
So what are the precautions in the storage process of Chinese fasteners?
1, stainless steel fasteners in the storage process to strengthen the protection of the product, in a dry environment, should not be plated good fasteners in China on the damp place.
In addition, attention should be paid to the packaging process, not violent packaging.
For special requirements of non-standard parts need to be wrapped with a mesh bag or other objects, pay attention to avoid confrontation with each other.
2, the hardness of stainless steel fasteners represents the ability of the material to resist hard objects pressed into its surface.
It is one of the important performance indicators of metal materials.
The higher the general hardness, the better the wear resistance.
Commonly used hardness indicators are Brinell hardness, Rockwell hardness, and Vickers hardness.
3, in the detection of stainless steel nut hardness, no heat treatment of the bolt, only need to do the surface hardness within the qualified range on the line.
If the heat treatment of the bolt should be cut in not part of a diameter surface hardness, hardness test in the face of the 1/2R at the hardness in line with standards.