There are many kinds of electroplating of iron combination screws: ordinary and environmentally friendly. For example: color zinc, generally called red color. White zinc, black zinc, white nickel. Blue zinc. There are environmentally friendly color zinc, environmentally friendly white zinc, and environmentally friendly blue zinc. Environmentally friendly white nickel. There are more advanced ones. Nickel on copper, nickel in brine.
Tools/Materials
Screw wires, iron screw wires include 1010, 1018, 10B21, etc.
Stainless steel screw wires include SUS201, SUS304, etc.
Steps/Methods
The requirements for the material of the combined screw depend on which material is required, whether it is iron or stainless steel. What is the national standard number of the combination screw? There are GB9074.8 and GB9074.4. There are GB9074.13 and so on.
The mechanical performance and strength requirements of the combined screw need not be hardened. The level requirements are divided into 4.8 and 8.8 levels.
You need to choose a manufacturer specializing in the production of combined screws. Comparison and selection of screw manufacturers' strength, sales experience and other aspects. Comparison of purchasing factors such as price, quality, service, etc. of combined screws.
Precautions
Combination screws include sub-pan head combination screws, outer hexagon combination screws, and iron combination screws, which require electroplating. And stainless steel combination screws. No electroplating is required, and the surface is bright. According to your personal needs, you can choose combination screws of different specifications.
There are many types of materials for making stainless steel screws, and they can be divided into several categories according to the structure at room temperature: austenitic type: such as 304, 321, 316, 310, etc.; martensite or ferrite type: such as 430, 420, 410 Wait; Austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to component segregation or improper heat treatment during smelting, a small amount of martensite or ferrite in austenitic 304 stainless steel will result. In this way, 304 stainless steel will have weak magnetic properties. After 304 stainless steel is cold worked, the structure will also be transformed into martensite. The greater the degree of cold working deformation, the more martensite transformation and the greater the magnetic properties of the steel. Like a batch of steel belts, Φ76 tubes are produced without obvious magnetic induction, and Φ9.5 tubes are produced. Because the bending deformation...
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