Causes of rust of 301 stainless steel strips

The mechanism of stainless steel rust prevention is that the alloying elements form a dense oxide film, which isolates oxygen contact and prevents further oxidation. So stainless steel is not "stainless steel".

Possible causes:

1.Chloride ions are present in the environment of use. Chloride ions are widely present, such as table salt, sweat stains, sea water, sea breeze, soil, etc.

In the presence of chloride ions, stainless steel corrodes very quickly, even more than ordinary mild steel. Therefore, there are requirements for the use environment of stainless steel, and it needs to be wiped frequently, dust removed, and kept clean and dry. (This would give him a "misuse" label.)

There is an example in the United States: a company uses an oak container to contain a solution containing chloride ions, the container has been used for nearly 100 years, and it is planned to be replaced in the nineties of the last century, because the oak material is not modern enough, stainless steel is used, and the container leaks due to corrosion 16 days after replacement.

2.It is not solution-treated. The alloying elements are not dissolved into the matrix, resulting in low alloy content and poor corrosion resistance in the matrix structure.

3.This titanium- and niobium-free material has a natural propensity for intergranular corrosion. The addition of titanium and niobium, combined with a stabilization treatment, can reduce intergranular corrosion.

It is a kind of high-alloy steel that can resist corrosion in the air or chemical corrosive medium, stainless steel is a kind of steel that has a beautiful surface and good corrosion resistance, does not have to go through surface treatment such as color plating, and gives full play to the inherent surface properties of stainless steel, and is used in many aspects, commonly known as stainless steel. Typical properties include 13 chromium steel, 18-8 chromium-nickel steel and other high-alloy steels.

If there is floating rust in stainless steel pipe fittings and knives, it can be improved by the following methods.

<> white vinegar – let the white vinegar evenly cover the rust area, which can be used with salt, because white vinegar contains acetic acid, and rust and acetic acid will react.

Toothpaste - first moisten the rusty area with water, then squeeze out the toothpaste and gently scrub it with a soft cloth, then rinse with water, and repeat many times until the rust is removed.

Potato Peel – Wipe the surface of the stainless steel faucet repeatedly with the peeled potato skin (the side of the meat) and you will find that the dirt and limescale will slowly be washed off.

Hello: 304 will rust after being scratched, because the scratches destroy the protective layer of the stainless steel surface, making it more susceptible to corrosion and rust. Mori Qi Lu.

If something is very important, it is recommended to try to fix it

Stainless steel scratching can be repaired by polishing, drawing, passivation, sandblasting, etc.

1. Polishing: If it is a stainless steel material for the mirror panel, you can use a wool wheel to polish the wax for polishing; Re-repair the stainless steel surface, 2. Wire drawing: The stainless steel material of the wire drawing plate can be directly drawn with a wire drawing cloth; In this way, scratches on the surface of the rusty steel can be repaired from the brushed plate.

3. Passivation: After the stainless steel is scratched, the surface passivation film is affected, and the surface treatment can be repaired with weld pickling passivation technology.

4. Sandblasting: If it is a stainless steel material with a matte surface, you can use the sandblasting method to repair the scratch.

Hope it works for you.

Yes, because the scratches destroy the protective layer of the stainless steel surface, making it easier to corrode and rust.

301 stainless steel.

It will not rust, 301 stainless steel can improve the strength and hardness of the steel through cold deformation processing, and retain enough plastic and toughness, and the steel has good rust resistance under atmospheric conditions, but the corrosion resistance in reducing media is not good, and the corrosion resistance in chemical media such as acid, alkali and salt is poor, so it is not recommended for use in corrosive and harsh environments.

301 is mainly used in a cold-worked state for equipment parts that are subjected to high loads and want to reduce the weight of the equipment and do not rust. In addition, this steel is prone to work hardening when hit by external forces, which can absorb more impact energy, and will provide more reliable safety guarantee for equipment and personnel.

Generally, not. 301 stainless steel (UNSS30100) is the most susceptible to cold deformation and strengthened yard round among traditional austenitic stainless steels. Its work hardening rate is extremely high, and with the increase of cold work, the tensile waxing strength and yield strength will be significantly improved.

This is particularly important for work-hardened reactor structures, including angles and channels, where additional strength and stiffness are expected after fabrication. On the other hand, for deep drawing applications, a lower work hardening rate is often preferred, which can be obtained in austenitic alloys with a higher nickel content (especially ).

301 stainless steel has good corrosion resistance under atmospheric conditions, but has poor corrosion resistance in reducing media and chemical media such as acid, alkali, salt, etc., so it is not recommended to use it in harsh corrosive environments. 301 steel is mainly used to withstand higher loads in cold working conditions, and also wants to reduce the weight of equipment and corrosion-resistant components.

Standard. ASTM 666 Standard: Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheets, Strips, Plates, and Flat Bars.

ASTM A240 A240M Standard: Chromium and Chromium-Nickel Stainless Steel Plates, Sheets, and Strips for Pressure Vessels and General Purpose.

ASTM A959 Standard: A standard guide to specifying harmonized standard grade compositions for wrought stainless steels.

Society of Automotive Engineers AMS 5517: Steel, Corrosion Resistant, Sheet and Strip.

SAE J405: Chemical composition of SAE forged stainless steel.

Chemical composition. S30100 Physical properties at room temperature:

Melting Point: 1400-1420

Density: Specific heat capacity: 500J

Coefficient of linear expansion: 17 10-6 K

Modulus of elasticity: 193gpa

Resistance: 720m

S30100 Mechanical properties at room temperature:

Test and Status: Solution annealing.

Executive standard: GB1220-90

Tensile strength: 520MPa

Yield Strength: 205MPa

Section shrinkage: 60%.

Hardness: 200HV

Apply. Model 301 is widely used in the stamping of spoons and forks, and other applications include springs, fasteners, clamps, automotive wheel covers, aircraft structural parts, etc.

304 stainless steel will rust.

1. However, it is not easy to rust, as long as 304 stainless steel is not placed in salt water for a long time, it will not rust.

2. Because 304 stainless steel rusts because it encounters chloride ions, the two will react after contact, and corrode and rust.

304 stainless steel to prevent rust.

1. The newly bought 304 stainless steel should be washed first. Prepare cooking oil, white or rice vinegar and a steel brush, pour a little rice vinegar into the pot and heat until the rice vinegar is boiling, turn off the heat. At the same time, use a steel brush dipped in rice vinegar to brush the inside of the pot carefully and vigorously several times to remove the impurities in the stainless steel pot.

2. After brushing clean, pour out the white vinegar or rice vinegar, rinse with water, and then heat the pot over high heat until all the water droplets have evaporated. At this time, turn to medium-low heat, pour in cooking oil, and then keep shaking the pot to make the cooking oil stick to the inside. Keep the heat low for about 3 minutes and pour out the oil.

3. Wash the pot with water and wipe it dry, then the pot will be very oily. When cooking things in the future, turn on low heat first, let the oil evenly adhere to the surface of the pan before stir-frying, it will not be easy to stick to the pan<>

Chloride ions are present in the operating environment.

Chloride ions are widely present, and rusty steel corrodes quickly in an environment where chloride ions are not available, and even surpasses ordinary low-carbon steel. Therefore, the reason for the rust of 304 stainless steel is the presence of chloride ions in the application environment.

304 stainless steel material introduction:

304 stainless steel is a relatively wide range of materials, it has the characteristics of high temperature resistance, even if the temperature reaches 1200 degrees Celsius, there is no need to worry, at the same time, its corrosion resistance is also very good, can be widely processed, with weldability, so it is widely used in the food industry and chemical industry.

The name of 304 stainless steel originated in the United States and Japan, and it is customary to distinguish the element content as a name in China, for example, the chromium element of this 304 stainless steel can reach 19% to 20%, and the nickel content reaches about 10%. If you have a magnet on hand, you can identify stainless steel by using the magnet. Because its magnetic properties are relatively small, it cannot be adsorbed with magnets.

If the magnetism is too large, it means that it does not belong to 304 stainless steel, but may be 202 material.

At the same time, we can also use special potions, because it is not easy to change color within a few minutes after dropping into the potion. But like 201 stainless steel, it will change color immediately after being dropped into the potion and will turn red. There is also 301 stainless steel that can turn brick red in about two minutes after being tested by dropping into the potion.

304 stainless steel has corrosion resistance and is widely used in life, such as our kitchen utensils, stainless steel woks, and tableware, etc., are made of 304 stainless steel. And because it has reached the food level, the thermos cup used is also made of 304 material. <>