Five Small Knowledge of Stainless Steel

A, stainless steel plate weight calculation formula: length * width * thickness * = weight proportion

For example: 1.5 mm * 1000 mm * 1000 mm, 1 * 2 * 1.5 * 7.93 = 23.79 kg

Second, stainless steel pipe weight calculation formula: (diameter and wall thickness) * wall thickness * = m weight proportion

For example: 108 * 4 mm tube, (108-4) * 4 * 0.02491 = 10.36 kg

Third, what is the difference between 304 and 201 stainless steel tube:

1, the price is different: 304 quality is better, but the price is expensive, 201 less, but the price is cheap.

2, different components: 304 is 8 nickel chromium 18, 201 to 1 nickel chrome 13

3, different antirust performance: 304 rust resistance is strong, weak 201 rust resistance

4, the intensity is different: the yield point 205 mp of 304 steel tensile strength 515 mpa, or 201 steel yield strength 275 mpa, the tensile strength of 520 mpa or higher

Four, why will rust stainless steel:

1, many people think that stainless steel tube will not rust, this is a kind of wrong one-sided view. First of all, no rust and corrosion resistance of stainless steel tube is conditional. Stainless steel piping in weak corrosion environments, such as atmosphere, fresh water is not rust of steel tube, and must be 12% or higher chromium content in steel. If the chromium content is low or not weak corrosion environments, such as in the atmosphere (including weak corrosion in atmospheric environment, but have local rich collection of Cl - concentration) under the condition of use, will rust. Acid-resistant steel tube is in strong acid, alkali, salt and other corrosive medium corrosion of the steel tube, but corrosion only under certain conditions, such as medium type, temperature, concentration, content of impurities, such as flow rate, pressure must be. Not in any conditions in the world is not rust, corrosion resistance of stainless steel pipe.

2, stainless steel surface dust containing other metal elements deposit savings or heterogeneous metal makings of attachments, in the humid air, attachments and stainless steel, the condensed water between the both together as a micro battery, triggers the electrochemical reaction, protective film is damaged, to call the electrochemical corrosion.

3, stainless steel surface adhesion with organic fluids (such as melon seeds, sputum noodle soup, etc.), under the condition of water is oxygen, organic acid, organic acid is formed for a long time on the surface of metal corrosion.

4, stainless steel surface adhesion containing acid, alkali, salt substances (e.g., decorate the walls of caustic soda and lime water spray test) cause local corrosion.

5, where there is air pollution (contains large amounts of hydrogen sulfide and oxide, oxidation atmosphere), in the condensation water, formation of nitric acid, acetic acid, liquid, chemical corrosion.

If you would like to know more about stainless seamless steel pipe and carbon steel pipe,pls contact:hunan great steel pipe co.,ltd