1, What is stainless steel?
Stainless steel is a chromium content exceeding 12%, thus having a large class of iron-base alloy of stainless steel characteristics collectively.
2 in stainless steel, nickel chromium complexes before play
Nickel is excellent in corrosion-resistant materials, the alloy steel is also an important alloying element. Nickel steel formation of austenite elements, but the combination of low-carbon nickel steel for pure austenitic nickel content of 24%, while only nickel-containing 27% when the steel corrosion resistance in some media performance changed significantly. Nickel alone can not constitute a stainless steel. However, nickel and chromium present in the stainless steel, nickel-containing stainless steel, but have many valuable properties.
3, the decisive role of chromium in stainless steel
Decision stainless steel is the only one element, which is chromium, each stainless steel containing a certain amount of chromium. So far, there is no chromium-free stainless steel. Chromium have become the key elements of the decision stainless steel performance, the fundamental reason is that the steel chromium as an alloying element, prompting its internal contradictions resistance movement to the benefit of the development of corrosion damage. This change can be obtained from the following areas: 1. Chromium iron-based solid solution electrode potential to improve absorption of chromium iron electronic iron passivation
Passivation is the anodic reaction is blocked due to the corrosion resistance of metals and alloys can improve phenomenon. Form theory of the passivation of metals and alloys, film theory, adsorption addressed the theory of electron arrangement.
, Why stainless steel?
Stainless steel smelting process, As alloying elements different varieties, different varieties to different, its characteristics are different, in order to be distinguished from the crown on the type of steel, the following is a common decorative stainless steel alloying elements The content of the table is for reference only:
5, why stainless steel cold deformation easy to rust
Stainless steel after bend, twist, fold due to produce dislocation outcrop (ie, the internal crystal structure damage), prone to pitting corrosion and rust.
6, stainless steel will not rust? Decorative stainless steel rust easily under what conditions?
Are not. Decorative stainless rust Apart from our own shortcomings, the respect of the environment, such as air humidity, air temperature, flow velocity, flow direction, the impurities contained in the air, and the number of great relationship. In the atmosphere and weak corrosive medium corrosion rate of less than 0.01 mm / year, which is considered "completely corrosion resistant. CI medium (such as salt), sulfuric acid, oxalic acid (commonly used in engineering and exterior cleaning), hydrochloric acid, porcelain cleaners (interior decoration supplies) will rust in the conservation process should use neutral substances (such as water) regular cleaning, the other should be avoided to reduce the corrosive medium adhesion and rust scratch sharp objects (such as blades, wire brush) to avoid affecting the appearance of the crystal structure of rust.
7, why try not to purchase a 300-series stainless steel tube?
Because of the so-called 300-series stainless steel decorative tube (nickel varieties), the vast majority of Zhejiang and Zhejiang region of small factories producing steel strip products, this product can not effectively remove impurities smelting process behind decarburization hardness, composition and organizational structure can not be guaranteed after the tube is made of heavy leather, with magnetic, greatly enhanced the possibility of rust, but the price cheaper than a major production, some factory in pursuit of profit through price competition in the market, there is not take into account the result of the product, in order to ensure the quality of the project, it is best not to purchase this quality assurance products.
8, the thicker sections of the same size, the harder it?
Not always. On the market today are part and lumber production technical limitations, high carbon content and contain a small amount of nitrogen lead to increase in hardness; addition, Cr, Ni content reduction, the hardness will rise. These two types of material toughness and corrosion resistance will fall.