Stainless steel hinge material analysis of the characteristics and differences
Author：admin Time：2014/12/30 9:32:20
Stainless steel hinge is also one of the most commonly used one kind of hinge in life, there are many kinds of stainless steel hinge with stainless steel materials, such as # 304 or # 316 stainless steel, etc.Are the hinges on market, 316 # stainless steel materials because the price is too expensive, use less, so does not see more in the market.Market many stainless steel will rust, especially 201 material is qualitative, the shortage of nickel content in surface can not meet the corresponding anti-corrosion standards.Standard 304 # stainless steel containing nickel degrees above eight units of nickel, under these conditions, has good rust resistance.But we know that any material is not absolute resistance to corrosion, even 304 # stainless steel material, the time is long, the surface still has certain corrosion attack, of course, and other materials, such as iron material, compared to less obvious.A lot of standard 201 # 202 # is used long also will rust, stainless steel rust mainly rely on adding some inert metal elements in the air, such as adding nickel, chromium.
The difference between 201 and 304 stainless steel
1, specifications: commonly used stainless steel plate is divided into two kinds of models 201 and 304, the actual are different, their composition 304 quality is better, but the price is expensive, 201.Before 304 for imports of stainless steel plate, 201 for the domestic stainless steel plate.However, with the improvement of science and technology, now 304 made of steel sheet can be produced in our country.
2, 201 to 17 cr - Ni - 4.5 mn - N, 6 section is Ni steel, 301 steel instead of steel.After cold working with magnetic, used for railway vehicles, etc.
3, 304 composed of 18 for cr - 9 ni, is the most widely used stainless steel, heat-resistant steel.Used in food production equipment, wast, general chemical equipment, nuclear power, daily hardware products, such as hinge, hinge, slide rail, and so on.
Manganese content in the 4, 201 is higher, the surface is very bright with dark light, with high manganese is easy to rust.304 containing chromium is more, surface is matte, not rust.Both together are compared.The corrosion resistance of the most important thing is different, the corrosion resistance of 201 is very poor, so the price is much cheaper.And since 201 low nickel, corrosion resistance is better than 304.
5, the difference between 201 and 304 of the most main is the problem of nickel content.304 prices are more expensive, and is generally going to nearly 50000 a tonne, but material 304 can ensure that in use process will not rust.(or potion experiment)
6, stainless steel is not easy to rust because forming a rich chromium oxide in the surface of steel body can protect the steel body, 201 belong to high manganese steel material is 304 hardness of high carbon low nickel.
7, the different components (mainly from carbon, manganese, nickel, chromium aspects to distinguish between 201 and 201 stainless steel)
Steel grade carbon (C) silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr), nickel (Ni), molybdenum (Mo), copper (Cu)
AISI (304) 0.08 1.00 2.00 0.045 0.03 or less or less or less or less or less 18-20 8-10
AISI (201) or less 0.15 1.00 1.00 5.5 0.05 0.03 or less or less or less 16 to 18, 3.5 to 5.5
A. the duality in stainless steel, carbon
Carbon steel is used in industry, one of the main elements of the performance of the steel and the organization decided to a great extent in the form of carbon in steel, the influence of carbon in the stainless steel is extremely significant.Carbon impact to the organization in the stainless steel is mainly manifested in two aspects, on the one hand, carbon austenitic elements are stable, and the role of a large (about 30 times of nickel), on the other hand, due to the affinity of carbon and chromium is very big, and chromium form a complex series of carbide.So, from the aspects of strength and corrosion resistance, the role of carbon in stainless steel is contradictory.Understanding the influence of the rule, we can from the use of different requirements, choose different levels of stainless steel.
B. the role of nickel in stainless steel only after cooperate with chromium play out
Nickel is excellent corrosion resistant materials, as well as the importance of alloy steel alloying elements.Nickel is the formation of austenite in the steel element, but the low-carbon nickel steel to obtain pure austenitic organization, nickel content reaches 24%;And only make 27% nickel steel in some medium corrosion resistance of significant change.So the nickel can’t constitute a stainless steel.But with is stainless steel, nickel and chromium nickel stainless steel has a lot of performance.
Based on the above knowable, nickel as the role of alloying element in stainless steel, is that it makes the high quality of organization change, so that the corrosion resistance of stainless steel and process performance for some improvement.
C. manganese and nitrogen can substitute for nickel chromium nickel stainless steel
The role of manganese in austenite is similar to nickel.The effect of manganese is not austenitic formation, but it slows the critical quenching of steel, increase the stability of austenite during cooling, inhibit austenite decomposition, keep high temperature to form austenite to to room temperature.On the corrosion resistance of steel, the effect of manganese is not big, such as the manganese content of steel from 0 to 10.4 nor make steel in air and acid corrosion resistance in the obvious change.This is due to the fierce to enhance the role of iron base solid solution of electrode potential is not big, the formation of oxide film of protection is also very low, so the industry is in manganese alloying austenitic steel, but they cannot be used as stainless steel.Manganese stability of austenite in the steel for half of the nickel, namely in 2% of nitrogen in the steel is also stable austenite, and effect degree bigger than the nickel.
D. stainless steel adding titanium niobium is to prevent intergranular corrosion.
E. molybdenum and copper can improve the corrosion resistance of stainless steel.
201 acid performance is poorer./ is commonly used in indoor, dry and ventilated place
304 acid with good performance.Commonly used in outdoor, or damp environment.