304 stainless steel belt is widely used in the field of stainless steel. Especially in stamping, hardware and electronics, hardware, etc., stainless steel is divided into austenitic stainless steel, ferritic stainless steel,
martensitic stainless steel, austenitic-ferritic duplex stainless steel and accumulation hardening stainless steel. In the meantime, only austenitic stainless steel and a part of accumulation hardening stainless steel (austenite accumulation
hardened stainless steel) is non-magnetic and cannot be absorbed by iron magnets; while other types of stainless steel are magnetic and can be absorbed by iron magnets. 304 stainless steel strip is austenitic
A kind of material in the rusty steel. 304 stainless steel belt contains more than 8 nickel and 18 chromium, and will not rust in the air and natural environment. We generally measure that stainless steel does not grow
rust is a specification. The definition of stainless steel in stainless steel materials is divided into: stainless steel that does not rust in weak corrosive media such as air, water, steam, etc.
The corrosion-resistant steel in strong corrosive media such as , salt solution, etc. is corrosion-resistant steel. Stainless steel may not be corrosion-resistant, and corrosion-resistant steel must be stainless. Because chromium and nickel are important groups in corrosion resistance of stainless steel materials
In the part, the content of chromium and nickel are different. For stainless steel materials, it can be divided into 201 202 303 309 304 314 316 317 310s, etc. Followed by the number of metallic chromium and nickel components
is generally used to produce metal or mechanical products. Generally speaking, 304 stainless steel belt has better hydraulic properties. In addition, it has superior corrosion resistance and pressure resistance, so it is widely reused. The roughness of 304 stainless steel strip has obvious influence on its appearance and corrosion resistance. It can be said to be an important guideline to measure the appearance quality of stainless steel strip. It varies with the appearance of stainless steel strip. Generally, roughness is required. The inspection will know that the commonly used appearance ranges from low to high, 8K–BA-2B. The roughness of 2B is about 0.1, and the others are smaller. The direction and orientation of the measurement will be changed.
304 stainless steel belt has light weight and high strength: the proportion of sanitary pipe is 1.65~2.0. Regarding the weight per unit length of the same pipe diameter, only 1/3 of the carbon steel, 1/5 of the cast iron pipe of the FRP pipe, and 1/10 of the prestressed concrete pipe, which reduces the lifting cost during the construction and improves the equipment Speed etc.
304 stainless steel belt has good water resistance and corrosion resistance: the sanitary pipe has excellent corrosion resistance, reduces the cost of corrosion, and extends the service life; at the same time, because it does not rust, the water quality is not subject to secondary pollution. It can also be used to transport sewage, mud, sea water and other media.
304 stainless steel belt pressure resistance: according to the pressure required by the process, plan and manufacture pipes and fittings, and conduct a hydraulic test at 1.5 times the pressure required by the process.
304 stainless steel belt interface has good sealing, no leakage, no splitting, increasing the safety and reliability of water supply.
304 stainless steel belt is a versatile stainless steel belt. 304 stainless steel belt has excellent general functions (corrosion resistance and formability), and is widely used in manufacturing equipment and machine parts. Generally used at a temperature less than 650°C. 304 stainless steel has excellent corrosion resistance and good resistance to intergranular corrosion. For oxidizing acids, it is found in the test: 304 stainless steel strip has strong corrosion resistance in nitric acid with a concentration of ≤65% temperature. It is concluded that the 304 stainless steel strip has excellent corrosion resistance to alkali solutions and most organic and inorganic acids.
In the process of cold rolling of stainless steel cold-rolled steel strip, all the factors that affect the rolling pressure, original roll gap, tension and oil film thickness of the rolling equipment will have an impact on the actual strip thickness difference, mainly in the following aspects:
The influence of temperature changes. The effect of temperature change of metallurgical spare parts on the thickness of stainless steel strips of rolling equipment is essentially the influence of temperature difference on the thickness. The temperature difference is mainly caused by the influence of metal deformation resistance and resistance factor.
The effect of tension changes. Tension is to change the metal deformation resistance of the rolling equipment by affecting the stress, and then cause the thickness to change. Changes in the tension of metallurgical spare parts not only affect the thickness of the strip head and tail, but also affect the thickness of other parts. When the tension is too large, it will affect the thickness and even change the width. Therefore, in the hot tandem rolling process, the stable and low tension rolling of the micro loop is generally used, and the cold tandem rolling is rolled in the cold state, and the material is processed. Hardening makes deformation resistance great.
Only by adjusting the roll gap of the rolling equipment to change the rolling force, it is difficult to obtain the required reduction rate, so it is necessary to use a larger inter-stand tension for rolling. Large tension is the most important feature of cold rolling production. The effects of metallurgical spare parts tension include: reducing rolling force and reducing rolling energy consumption; avoiding strip deviation; controlling strip shape and strip thickness. Analysis on the Causes of Thickness Difference of Cold Rolled Stainless Steel Strip
The effect of speed changes. The speed is mainly effected by changing the rolling pressure and reduction by the resistance factor, deformation resistance, and bearing oil film thickness. The degree of hardness of the smooth wheel is different, and the grinding effect on the product substrate is different. According to this, the mechanical polishing can be performed. Divided into rough throw, medium throw and fine throw. .
The influence of roll gap changes. When stainless steel strip is rolled, the roll gap of the rolling equipment will be changed due to the thermal expansion of the rolling mill components, the wear of the roll gap and the offset of the roll, which directly affects the actual thickness change. The periodic change of the roll gap caused by the misalignment of metallurgical spare parts rolls and bearings will cause high-frequency periodic thickness insufficiency in the case of high-speed rolling.
304 stainless steel belt is suitable for food processing, storage and transportation. 304 stainless steel has excellent workability and weldability. Plate heat exchangers, bellows, household products (category 1, 2 tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), auto parts (windshield wipers, mufflers, molded products), medical appliances, building materials, chemicals, food industry , Agriculture, ship parts, etc. 304 stainless steel belt is a nationally recognized food grade stainless steel belt.
There are many varieties of cold-rolled stainless steel strips, common ones are 201, 304, 430, etc. These different types of cold-rolled stainless steel strips have different properties. If they are thick, problems may arise. Therefore, how to distinguish cold rolled stainless steel strip has become an important issue.
We must first understand that cold-rolled stainless steel strips can be divided into austenitic and martensitic types according to their structure. The cold-rolled stainless steel strips generally used as decorative tube sheets are mostly austenitic 304 materials, generally non-magnetic or weak magnetic, but magnetic properties may also appear due to the chemical composition of the drill or the different processing conditions. This cannot be considered counterfeit or substandard.
Secondly, austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Because of component segregation or improper heat treatment during training, a small amount of martensite or ferrite in austenitic 304 stainless steel will be formed. organization. In this way, 304 stainless steel will have fine magnetism.
Others, 304 stainless steel will transform into martensite through cold working. The greater the degree of cold working deformation, the more martensite will be transformed and the greater the magnetic properties of the steel. It seems that a batch of steel belts produces Φ76 tubes without obvious magnetic induction, and produces Φ9.5 tubes. The magnetic induction is more obvious due to the larger bending deformation. The square rectangular tube produced has a larger deformation than the round tube, especially the corners, the deformation is more severe and the magnetism is more obvious.
Assuming that in order to completely eliminate the magnetic properties of 304 steel composed of the above-mentioned reasons, the austenite structure can be stabilized and stabilized by high-temperature solution treatment, and then the magnetic properties can be eliminated.
In particular, the magnetic properties of the 304 cold-rolled stainless steel strip formed for the above reasons are not at the same level as the magnetic properties of other cold-rolled stainless steel strips, such as 430 and carbon steel. That is to say, the magnetic properties of 304 steel have always flashed. Is weakly magnetic.