How can stainless steel be dyed black, and how to remove stainless steel blackened

1. Grade: S21800

Two: Chemical composition:

Carbon C: Silicon Si: Manganese Mn: 7-9 Phosphorus P: Sulfur S: Chromium Cr: 16-18

Nickel Ni: Tungsten W:- Copper Cu:- Nitrogen N:

Three: the scope of application, the field of application:

It is widely used in the electric power, chemical, petrochemical, food and oil and gas industries, including expansion joint wear plates, wear pump rings, bushings, process valve stems, seals and logging equipment.

Four: Physical properties:

Tensile strength = 655 MPa Yield strength = 345 MPa Elongation du 2% = 35% min

Five: Overview. Compared to cobalt-containing and high-nickel alloys, stainless steel is resistant to corrosion and wear at a very low cost.

Its overall corrosion resistance is better than that of Type 304 in most media. In , the resistance to chloride pitting is better than that of Type 316. The yield strength at room temperature is almost twice that of 304 and 316.

It has excellent resistance to high-temperature oxidation and low-temperature impact.

If the stainless steel is burned black, it can be removed with tomatoes, white vinegar, steel wool balls, toothpaste, and caustic soda.

1. Tomatoes

When using stainless steel pots, the fire should not be too large and too concentrated, and if the fire is too fierce, it will be easy to burn the stainless steel pot black. Pick a few tomatoes, put them in a pot and boil them, slowly the burnt part of the bottom of the pot will fall off, and finally clean them.

2. White vinegar

Consider adding some white vinegar to the pot and then boiling it over low heat for a while, at which point you will find that the black layer on your pot will soon fall off, and then leave it there for two days so that the acetic acid and iron oxide can fully react.

3. Steel wool balls

This is a relatively simple and crude method, and it can be said that the removal effect is also very good, but it will be more laborious to use.

4. Toothpaste

Apply toothpaste to the pot, dip a cloth in some water, and scrub vigorously. If it's summer, pour a little rice into the pot and let it ferment naturally. After letting it sit for two days and smelling the sourness, wash it off.

5. Caustic soda

Pour the caustic water into the pot and leave it there overnight, and you will find a good effect the next day.

The most common method is to soak it in hot water, add various dish soaps, and then use a cleaning cloth or brush to clean it.

Apply toothpaste, dip a cloth in some water, and rub hard, which is economical and does not hurt the pot, but it may take a little effort to wipe. Wipe the inside and wipe the surface are good choices.

Use fruits and vegetables that contain fruit acids at home, such as tomatoes, lemons, mountain reds, etc., and pour them into water and boil. Of course, vinegar works well.

Dry cook over low heat for a while, sprinkle salt when smoking, shake for a minute, turn off the heat, and then wipe again, you can remove it very cleanly, leaving no bottom and no mushy smell.

Scrub with hot water and baking soda. It's about the same as dish soap, and the washing power is greater. This is a must-have in the family.

Precautions: Try not to use steel wool balls to clean stainless steel products, which will cause irreversible scratches, and it is recommended to use cleaning products with a soft texture. The most important thing for kitchen utensils is to maintain, and cleaning them in time after cooking is the best way to maintain them. "

1.Cleaning Balls Using cleaning balls, also known as steel wool balls, will quickly remove the black color, but it will also leave scratches on the stainless steel, causing damage to the cookware. 2.

Toothpaste If it is only black and does not have a thick paste, you can apply toothpaste on it and rub it vigorously with a scouring pad to remove the black color. 3.Alkaline noodles Sprinkle the alkaline noodles used for the noodles on the bottom of the pot, pour a little water, and wipe vigorously with a cloth to remove the black 4

Baking Soda Sprinkle baking soda powder on a black area and wipe it with a damp cloth to remove the black color from the bottom of the pan. 5.White vinegar Put the pot on the stove, put water in it, pour some white vinegar, bring the water to a boil, and brush the bottom of the pot with a brush to remove the black.

6.Pineapple skin Fill the pot with water, put it on the stove and bring it to a boil, throw some leftover pineapple peels into it, and cook it together with the pineapple peel to remove the black color on it. 7.

Special detergent If you want to save trouble, buy a bottle of special detergent, which is fast and effective.

Summary. Stainless steel blackening is divided into three types: low-temperature blackening, optical matting blackening, and high-temperature blackening.

1. The quality of stainless steel low-temperature blackening process is better than that of the same industry, and the blackening film of the treated workpiece is firm, the adhesion is good, the oil seal is dark, and there is a certain wear resistance. Comply with the national standard GB T15519But it can't compete with high temperatures.

2. The stainless steel optical matting and blackening process is treated by a special method to make the workpiece get a matte, non-reflective black oxide film, strong and firm binding force of the blackening film, no hanging ash, good wear resistance, in line with the military standard WJ1535-82It is widely used in precision optical equipment and components such as lenses, lens barrels, lens lens shields, etc.

3. Stainless steel has good high-temperature blackening effect, good corrosion resistance, wear resistance, blackening film binding force is very firm, and the surface layer of the treated workpiece has wear resistance, friction reduction, scratch resistance, bite resistance, fatigue resistance, corrosion resistance and self-lubrication performance. It conforms to the national standard SGS, GB T15519, military standard WJ535-82, German standard DIN50938, American standard MIL-C-13924.

How can you turn stainless steel black.

Okay, Roger.

Steel blackening is to place the workpiece in a steel blackening agent to form a thin film of ferric tetroxide on the surface of steel. The film is thick to the micron level, uniform and dense and firmly bonded to the steel surface. Since this membrane is blue-black, it is often referred to as bluish or blackened.

In addition to phosphating treatment, steel rust prevention can also be treated with blackening. The main principle of steel blackening is to form a dense oxide film on the surface of steel to isolate the air and prevent rust.

Stainless steel blackening is divided into three types: low-temperature blackening, optical matting blackening, and high-temperature blackening. 1. The quality of stainless steel low-temperature blackening process is better than that of the same industry, and the blackening film of the treated workpiece is firm, the adhesion is good, the oil seal is dark, and there is a certain wear resistance.

Comply with the national standard GB T15519But it can't compete with high temperatures. 2. The stainless steel optical matting and blackening process is treated by a special method to make the workpiece get a matte, non-reflective black oxide film, strong and firm binding force of the blackening film, no hanging ash, good wear resistance, in line with the military standard WJ1535-82

It is widely used in precision optical equipment and components such as lenses, lens barrels, lens lens shields, etc. 3. Stainless steel has good high-temperature blackening effect, good corrosion resistance, wear resistance, blackening film binding force is very firm, and the surface layer of the treated workpiece has wear resistance, friction reduction, scratch resistance, bite resistance, fatigue resistance, corrosion resistance and self-lubrication performance. It conforms to the national standard SGS, GB T15519, military standard WJ535-82, German standard DIN50938, American standard MIL-C-13924.