Stainless steel Hexagon socket cheese head shoulder SUS304 SUS316
A2-70 Customized Step bolt
Product Description:
Hexagon socket head cylindrical head shoulder screws are also
called hexagon socket head cap screws and also hexagon socket head
bolts. Its head is hexagonal head and cylindrical head. According
to the material, there are stainless steel and iron. Stainless
steel has stainless steel SUS202 hexagon socket cheese head screws,
this is stainless steel common material, stainless steel SUS304
hexagon socket cheese head screws, stainless steel SUS316 hexagon
socket cheese head screws. Iron by hexagon socket head cap screws
strength grade, there are 4.8 grade hexagon socket head cap screws,
there are 8.8 grade hexagon socket head cap screws, there are 10.9
grade hexagon socket head cap screws, there are 12.9 grade hexagon
socket head cap screws.8.8-12.9 grade hexagon socket head cap
screws are called high-strength and high-grade hexagon socket head
cap screws.
Hexagon socket cheese head shoulder screws according to the
hardness of the screw thread, carry tension, yield strength, etc.
There is a grade classification, that is, the level of hexagon
socket head bolts, hexagon socket head bolts are what level.
Different products on the material, the requirements of different
levels of hexagonal bolts and its corresponding, hexagonal bolts
according to the level of strength is divided into ordinary and
high strength. Ordinary hexagon socket head cap screws are 4.8
grade, high strength hexagon socket head cap screws are 8.8 grade
or above, including 10.9 grade and 12.9 grade. 12.9 grade hexagon
socket head cap screws generally refer to knurled, black hexagon
socket head cap screws with oil in the original colour. The
performance grade of hexagonal bolts for steel structure connection
is divided into 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and
other 10 grades, of which the material of bolts of grade 8.8 and
above is low-carbon alloy steel or medium-carbon steel and
heat-treated (quenched and tempered), commonly known as
high-strength bolts, and the rest are commonly known as ordinary
bolts. Bolt performance level marking has two parts of the digital
composition, respectively, the nominal tensile strength of the bolt
material value and flexural strength ratio value
Applications:
Stainless Steel:
1, the basic knowledge of stainless steel
Stainless steel is an alloy material with corrosion resistance, and
its main components are an alloy of elements such as iron, chromium
and nickel. These elements can effectively resist oxidation and
corrosion, so that stainless steel has a high degree of durability
and aesthetics.
2, stainless steel maintenance methods
Cleaning
Keeping stainless steel products clean is an important part of
their maintenance. You can use mild detergents and soft cloth for
cleaning, avoid the use of detergents containing acidic and
alkaline components, so as not to damage the surface of stainless
steel. When removing dirt, you should try to avoid using irritating
cleaning tools to avoid scratching the stainless steel surface.
After cleaning, rinse with water and dry with a clean soft cloth.
3, the use of stain remover
For some stubborn dirt, you can use special stainless steel stain
remover for cleaning. But before using it, you should carefully
read and follow the instructions in the product manual. In
addition, stainless steel products on the dirt can be cleaned with
alcohol or vinegar, these common cleaners on stainless steel has a
certain decontamination effect.
Steel types:
| No. | C% | Cr% | Ni % | Mo % |
| 304 | 0.07 | 17.5-19.5 | 8.0-10.5 | / |
| 316 | 0.08 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 |
| 301 | 0.15 | 16.0-18.1 | 6-8 | / |
| 310 | 0.08 | 24-26 | 19-22 | / |
| 304L | 0.03 | 18-20 | 8-12 | / |
| 316L | 0.03 | 16-18 | 10-14 | 2-3 |
| 321 | 0.08 | 17-19 | 9-12 | / |
201, 304, 316 are austenitic stainless steel, according to the
performance of the non-magnetic, some of the performance of the
weak magnetic because of the smelting of the composition of the
segregation or improper heat treatment leads to the austenite in a
small amount of martensite or ferrite. Austenitic stainless steel
corrosion resistance comes from the formation of chromium oxide
protective layer on the metal surface. When the material
temperature is heated to 450 degrees -900 degrees, the structure
changes, will form chromium carbide along the edge of the crystal
and can not form a protective layer of chromium oxide, thus
reducing the corrosion resistance, this is also known as
‘intergranular corrosion’. As a result, there are 304L and 316L,
the two due to the low carbon content also reduces the
intergranular corrosion. In particular, the higher susceptibility
to intergranular corrosion does not mean that non-low carbon
content is more susceptible to corrosion, in a highly chlorinated
environment, this susceptibility is also higher.
304 stainless steel
304 is a general-purpose stainless steel that is widely used to
make equipment and machine parts that require good all-round
performance (corrosion resistance and formability). In order to
maintain the corrosion resistance inherent in stainless steel, the
steel must contain more than 18% chromium, more than 8% nickel content. 304 stainless steel is a grade of
stainless steel produced according to the American ASTM standard.
A2 stainless steel and A4 stainless steel, A2 is a class of 304
stainless steel, A4 is a class of 316 stainless steel, the main
difference between the two is here, some of the fastener industry
will be 302HQ and 304 referred to as: A2, 316 and 316L (C content
of carbon C is less than 03% of the stainless steel, you can
increase the ‘L’ logo) called A4.
What is the difference between a270 and a470 stainless steel bolts
Nuts are usually used in conjunction with bolts. Hexagonal nuts are
more widely used.C-grade hexagonal nuts are used in steel
structures, machinery and equipment with rough surfaces and low
requirements for precision.A-grade and B-grade hexagonal nuts are
mainly used in machinery and equipment with smooth surfaces and
high requirements for precision.
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