Large stainless steel fastener dealers cater to the popular stainless steel fastener products; The companies that advertise on this page have a stainless steel fastener niche that gives them a market advantage. If you need hard to find stainless steel fastener products, these are fastener companies to contact. Stainless steel, also known as French "inoxydable" inox, is a steel alloy with a minimum chromium content of 10.5%.
Stainless steel fasteners are not as prone to corrosion, rust or stain in clean water environments as ordinary steel, but despite the name, they will not stain or rust proof; Especially in environments with low oxygen, high salinity, and poor chemistry or circulation. Stainless steel fasteners come in different grades and finishes to suit the environment the alloy must withstand. Stainless steel fasteners are used where the properties of steel and corrosion resistance are required. Stainless steel fasteners differ from carbon steel in the amount of chromium present. Unprotected carbon steel fasteners are prone to rust when exposed to air and moisture. This iron oxide film rusts and accelerates corrosion by forming more iron oxide, and this tends to flake and fall off due to the larger volume of iron oxide. Stainless steel fasteners contain enough chromium to form a passivated surface film of chromium oxide to prevent further surface corrosion by preventing oxygen from entering the steel surface and preventing corrosion from spreading into the internal structure of the stainless steel. Due to the similar size of steel and oxide ions, they bind very strongly and remain attached to the surface. If the proportion of chromium is high enough and oxygen is present, only the outer layer (passivation bonding) occurs.
Special stainless steel fastener Model AISI 303 S21(form EN58AM)(Austenitic - non-magnetic) free process quality (containing sulfur). Good corrosion resistance and weldability are fair, but oxyacetylene is generally not recommended. It can be cold formed, but serious sharp corner bending should be avoided. Model AISI 304 S15(form. EN58E) (Austenitic - non-magnetic) general purpose stainless steel, average machinability, good general corrosion resistance, good weldability. (Oxyacetylene is generally not recommended). Cold forming is very good; It also has good polishing quality. Non-magnetic when annealed, slightly magnetic when cold working. Model AISI 316 S16(Form. EN58J)(Austenitic - non-magnetic) High resistance to corrosion, especially salt water and acids. Processability equity. Good weldability. Cold forming good. Non-magnetic when annealed, slightly magnetic when cold working. Model AISI 321 S20(Form. EN58B)(Austenitic - non-magnetic) Good corrosion resistance and oxidation resistance. The weldability is very good and the machinability is fair. Cold forming good. Non-magnetic when annealed, slightly magnetic when cold working.
These steels, which typically contain 13% chromium, have the lowest general corrosion resistance and can therefore be used where corrosion conditions are relatively light. A classic example is cutlery. The most common ferritic steel for fasteners is 430S17 containing 17% chromium, which improves the corrosion resistance of martensitic steel. Although it does not meet the standards of austenitic steel, it can be used in car decoration, as well as home decoration accessories on refrigerators, gas stoves. Austenitic steel fasteners A group of steels by far the most important and therefore the most widely used. 18/8,A2 steel is resistant to corrosion in a variety of environments and is commonly used in food, dairy, breweries and other processing industries, as well as certain chemical plants.
Molybdenum alloy fasteners Molybdenum can be added to 18/8 and A2 types of stainless steel to provide higher corrosion resistance, 316 steel fasteners containing 2.0% to 3.0% molybdenum are mainly used in the chemical and petrochemical industries, where the corrosion resistant medium chloride is required. It should be noted that even these steels are not immune to various chemical attacks from reducing solutions such as hydrochloric acid or oxalic acid, especially when these acids are hot or in high concentrations. The basic austenite components are the familiar 18% chromium and 8% nickel alloys. Chromium and nickel can be added to further improve corrosion resistance, and additional elements such as molybdenum can be added to enhance this property. Austenitic steel is non-magnetic and cannot be hardened by heat treatment. The only way to harden these steels is by cold forming or deformation when strain hardening occurs rapidly. By annealing, the steel can be restored to a completely softened state.
