SS304 SS316 Stainless Steel Hex Bolts DIN931 half thread Hex Head
tainless steel screws usually refer to steel screws that are
resistant to corrosion in air, water, acid, salt or other media.
Stainless steel screws are generally not rusty, durable, and can be
used for environmental or medical equipment. Communication
Depending on the composition of the alloy, the emphasis is placed
on rust resistance and acid resistance respectively. Although some
steels have rust resistance, they are not necessarily acid
resistant, while acid resistant steels are usually rustless in
people's daily life. Often referred to stainless steel is also
austenitic stainless steel. We use stainless steel fasteners, the
main raw materials are austenite 302,304,316 and "low nickel" 201
and so on.
Stainless steel usually refers to steels that are resistant to
corrosion in air, water, acid, alkali or other media. Depending on
the composition of the alloy, emphasis is placed on rust resistance
and acid resistance, respectively. Some steels have rustless
properties. But not necessarily acid resistant, acid resistant
steel is usually rustless. Used in the production of fasteners are
mainly austenitic stainless steel, in people's daily life. Often
referred to stainless steel is also austenitic stainless steel. We
use stainless steel fasteners, the main raw materials are austenite
302,304,316 and "low nickel" 201 and so on.
Mainly used in: environmental protection equipment, medical
equipment, communication equipment, power facilities, electronic
products, instrumentation, food machinery, petrochemical, marine
assembly, pump valve piping, building curtain wall, open air,
sports facilities. Outdoor decoration, etc.
Stainless steel screw selection principle:
The choice of stainless steel materials is mainly considered in the
following five aspects .
1 . In terms of mechanical properties of stainless steel screw
materials , especially strong
2, the requirements of the working conditions on the corrosion
resistance of the materials;
(3) the requirements of working temperature on the heat resistance
(high temperature strength, oxidation resistance) of the materials;
4. The requirement of material processing performance in production
5, other aspects, such as weight, price, procurement and many other
factors to be considered.
People often think that magnets adsorb stainless steel, verify its
advantages and disadvantages and authenticity, do not absorb
magnetic, think it is good, real; If the sucker is magnetic, it is
considered to be a fake. In fact, this is an extremely one-sided,
unpractical way of identifying mistakes. There are a wide variety
of stainless steel screws. It can be divided into several
categories according to the structure at room temperature: 1.
Austenitic type: such as 304,321,316,310; 2. Martensite or ferrite
type: for example, 430,420,410; Austenitic type is nonmagnetic or
weakly magnetic, martensite or ferrite is magnetic. Stainless steel
usually used as decorative tube plate is mostly austeniteThe 304
material of somatotype, say generally is nonmagnetic or weak
magnetic, but because smelting causes chemical composition to
fluctuate or processing state is different also may appear
magnetism, but this cannot be considered to be false or
unqualified, what reason is this? The above mentioned austenite is
nonmagnetic or weakly magnetic while martensite or ferrite is
magnetic due to improper segregation or heat treatment during
smelting. It causes a small amount of martensite or ferrite in the
austenitic 304 stainless steel. In this way, there is weak
magnetism in the austenitic 304 stainless steel. In addition, the
304 stainless steel is cold-worked. The microstructure will also be
transformed to martensite. The larger the deformation degree of
cold working is, the more the horse will become.The more the
transformation of the body, the greater the magnetic properties of
the steel. Like a lot of steel strip, Φ 76 tubes are produced
without obvious magnetic inductance, and Φ 9.5 tubes are produced.
The bigger magnetic inductance is due to the cold bending
deformation, the more obvious the magnetic inductance is. The
deformation of square rectangular tube is much larger than that of
circular tube, especially in the corner part, and the deformation
is more intense and magnetic. The magnetic properties of 304 steel
caused by the above reasons should be completely eliminated.
Stabilization of austenitic microstructure can be restored by high
temperature solution treatment, thereby eliminating magnetic
properties. In particular, the magnetic properties of 304 stainless
steel due to the above reasons are similar to those of other
stainless steels, such as 430. The magnetic properties of carbon
steel are completely different from those of the same class.That is
to say, the magnetic properties of 304 steel always show weak
magnetism. This tells us that if stainless steel has weak magnetism
or no magnetism at all, it should be classified as 304 or 316
material. If with carbon steel magnetism, show strong magnetism,
because the discrimination is not 304 material.
|Product Dimensions||M10 x 40mm|
|Item Weight||35kg 1000 pieces|
|Free Sample||Available, only shipping need to be charged|
|Thread type||Paritcial Thread|
Corrosion Resistance,High Tensile, offer high holding power
Stainless steel screws are widely used in machinery , petrochemical
, communication , chemical industry , construction industry ,
electric power , textile , sports equipment , paper making , sewage
treatment , ship , automobile and other industries . With the
improvement of domestic economic living standard , the application
scope of stainless steel screw will be more extensive .
Stainless steel screws, as the name implies, must be made of
stainless steel screws and wire piers. After rubbing the screw
thread. And stainless steel screws have a lot of properties related
to stainless steel material. Considering the properties and
organization of stainless steel. To understand the properties of
stainless steel, so as to understand that stainless steel has
anti-rust, anti-corrosion, high-temperature and other good
mechanical properties. Then stainless steel screws of course have
these good mechanical properties. With the material of stainless
steel more and more excellent. Screw industry produced stainless
steel screws on the mechanical properties of better and better.
Rust prevention. Corrosion resistance, and high temperature and
pressure is getting stronger and stronger.
Type 302 for machine-working screws and self-tapping bolts.
Model 303 to improve cutting performance of stainless steel type
303 added a small amount of sulfur, used in bar processing nuts.
Model 304 is suitable for stainless steel screw processing by hot
upsetting, such as long specification bolts and large diameter
bolts, which may be beyond the range of cold heading process.
Model 305 is suitable for cold heading processing stainless steel
screws, such as cold forming nuts, hexagonal bolts.
Type 309 and 310, which contain more Cr and Ni than 18-8 stainless
steel, are suitable for working stainless steel screws at high
Both 316 and 317 contain Mo-alloy elements, so their high
temperature strength and corrosion resistance are higher than those
of 18-8 stainless steel.
Type 321 and 347 type , 321 type containing more stable alloying
elements Ti and 347 contain Nb , thus improving the intergranular
corrosion resistance of the material . It is suitable for stainless
steel standard parts which are not annealed after welding or serve
at 420 to 1013 DEG C .
Stainless steel screws do not necessarily corrode rust. Just say
stainless steel screw is stronger than iron screw to carry
corrosion rusty ability. But stainless steel screw still can rust
under certain circumstance. So stainless steel screw is easy to
cause rust under what condition! What is the cause of rust?
Stainless steel screws have good characteristics, strong corrosion
bearing ability, high temperature resistance. Also has the strong
anti-rust performance. But in the bad environment still will rust.
For example the stainless steel screw in the very damp condition,
every day the sun is drenched, the wind and rain blows. The time is
long. It's more or less sure to rust. In contact, for example, with
some acid-base chemicals to produce a chemical reaction that causes
corrosion. And stainless steel screws that are not good. For
example, the material of stainless steel SUS201 screws used in the
sea water products, due to regular time immersion, the original
SUS201 stainless steel screws itself is not too muchSuitable for
use in seawater with strong salt properties, resulting in corrosion
and rust. For use on seawater products, stainless steel SUS316
screws are generally recommended. Because 316 stainless steel screw
to carry corrosion and other performance is better.
From the above it can be concluded that stainless steel screws will
still corrode rust under certain circumstances. This requires the
rational use of stainless steel screws. In different cases use
different stainless steel screws. And in different situations, in
the use of stainless steel screws, also need to pay special
attention to some of the details of the problem. Think about it.
Try to control stainless steel screw corrosion and rust.