【Summary】Why say the material of stainless steel screws? Because the price mechanism of stainless steel screws, material costs account for a large part, while the material of carbon steel screws stand for a small ratio, are some heat treatment costs or galvanic zinc costs. So the material of stainless steel screws is much more important than other materials.
Why say the material of stainless steel screws? Because the price mechanism of stainless steel screws, material costs account for a large part, while the material of carbon steel screws stand for a small ratio, are some heat treatment costs or galvanic zinc costs. So the material of stainless steel screws is much more important than other materials.
There is a key factor is that the performance of stainless steel screws, good or bad, and manufacturing has nothing to do with the post-processing also has nothing to do with the material, that is, good material, the screw is good, poor material, the screw is also poor. So this article we list the main materials used in the production of stainless steel screws which are several.
Stainless steel screw material, earlier is used more in Japan, so the material description are a bit on the Japanese side, such as the common SUS304 stainless steel screws, this SUS304 is actually the material grade standard used in Japan, until now, are using it. After years of development, the rise of domestic material manufacturers, the country's material performance, so that we produce stainless steel screw materials as long as the domestic procurement can be, so the domestic materials also need a national standard to define.
We take SUS304, although now this name is also more common, but in our country, it is called 0Cr18Ni9, this name compared to the Japanese, it seems more complicated, but this is much more standard than the Japanese name, the combination of these few numbers and English letters, the metal elements of the material are written in, professionals will know at a glance which material it refers to, including what its properties are. This includes what its properties are.
Let's take a look at SUS316 stainless steel screw material, its strength standard is A4-70, will be printed directly on the head of the screw, while our standard statement is 0Cr17Ni12Mo2, and this description, the same is also the composition of the metal elements are made a brief description. Just because our country this description is relatively more complex some, the use of not very convenient, so or SUS304 stainless steel screws and SUS316 stainless steel screws this name is more some. The following are some of the main stainless steel screws produced by the material grade control, the front is the foreign designation, followed by the domestic standard designation.
SUS316 stainless steel = 0Cr17Ni12Mo2 stainless steel, used in the production of stainless steel hexagonal bolts and stainless steel hexagonal bolts and nuts and washers, etc.
SUS302 stainless steel = 1Cr18Ni9 stainless steel, mainly used for the production of stainless steel machine screws series products, cross pan head screws and cross countersunk head screws are more used.
SUS304 stainless steel = 0Cr19Ni9 stainless steel, used for the production of stainless steel hexagonal bolts and stainless steel hexagonal screws and nuts and washers a full range of fasteners products.
304L stainless steel = 00Cr19Ni11 stainless steel, can be used for sheet metal more.
316L stainless steel = 00Cr17Ni14Mo2 stainless steel, valves, pipes, bolts and nuts can be produced with it.
329J1 stainless steel = 0Cr26Ni5Mo2 stainless steel, pipes, wires and plates etc.
431 stainless steel = 1Cr17Ni2 stainless steel, self-tapping screws drilling screws, etc.
304F stainless steel = 1Cr17 stainless steel, plate and wire automotive parts.
321 stainless steel=0Cr18Ni11Ti stainless steel, self-tapping screws, machine screws series.
310 stainless steel = 0Cr25Ni20 stainless steel, self-tapping screws, plate and plate work, turned spare parts, etc.
Introduction to bolt strength classes
Strength grades are classified according to mechanical properties. According to the relevant standards, the bolt performance grade is divided into 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and more than 10 grades, of which 8.8 and above bolts made of low-carbon alloy steel or medium carbon steel and heat treatment (quenching, tempering), commonly known as high-strength bolts, the rest are commonly known as ordinary bolts. The bolt performance grade number has two parts consisting of numbers, which indicate the nominal tensile strength value of the bolt material and the flexural strength ratio. For example.MORE +
The first is the punching of the head, where the head of the screw is punched out of the wire and the wire is cut. The second is thread rolling, where two files are used to thwart the threads on top of the previous process.MORE +
Performance grades for hexagonal flange bolts
The bolt performance grade is composed of two numerical parts, which indicate the nominal tensile strength value and the flexural strength ratio of the bolt material.MORE +
What are the common automotive fasteners
Generally we use most of the fasteners belong to the type of general-purpose parts, its standard type is still quite high, the common fastener parts are the following 12 kinds:MORE +