Without surface treatment: take 304 as an example, without any surface treatment, stainless steel bolts generally salt spray test time for 48 hours, nut for 96 hours, but affected by the surface roughness of the product itself, do not rule out the possibility of rust for 48 hours. After processin Read More

The length of the bolt should be chosen appropriately, 1-2 tooth distances shall prevail after tightening the exposed nut. The tensile strength of bolts and the safety of nuts meet the design requirements. Clean the thread before use. If the thread is damaged, at least the nut can pass smoothly. Read More

The principle of stainless steel rust is to add chromium, forming chromium oxide protective film on the surface of the steel, in order to effectively block the contact between the steel and the air, so that the oxygen in the air can not enter the steel to produce chemical reaction, to achieve the Read More

Adaptability in high temperature environment: according to GB/T3098.6-2014 standard, stainless steel 304 and 316 products within 100℃ does not affect the tensile strength, but more than 100℃ after every 100℃ temperature rise, tensile strength reduced by 5%, in more than 400℃ is not recommended to us Read More

Blackening is a common means of chemical surface treatment, the principle is to produce a layer of oxide film on the metal surface, in order to isolate air, to achieve the purpose of rust prevention. Appearance requirements are not high can be used black processing,. The coating film is generated Read More

Methods to remove burrs on fasteners:In order to improve the performance and service life of fasteners, it is necessary to remove fastener burrs before using fasteners. Fasteners are commonly used parts in machinery and equipment, and are also important parts. Therefore, the surface, acute angles an Read More

Stainless steel during hot working, machining or place after a certain period of time the surface will form a layer of black or gray scale, the main ingredients for Cr2O3, NiO and very refractory FeO, Cr2O3, affect the appearance quality, their presence on the one hand, on the other hand also influe Read More

Electrogalvanizing, also known as cold galvanizing in the industry, is the process of using electrolysis to form uniform, dense and well-combined metal or alloy deposition layer on the surface of the workpiece. Compared with other metals, zinc is relatively cheap and easy to coat a metal, a low val Read More

In the assembly process of spring washer, the spring washer directly enlarges and expands outward, which is called rising ring. This phenomenon has a long history, the cause of which was reported half a century ago, but so far there are different opinions, there is no clear conclusion. According Read More