18 8 stainless steel strength cracked#
18 8 stainless steel strength full#

Unlike stainless steel, however, these artifacts owe their durability not to chromium but to their high phosphorus content, which, together with favorable local weather conditions, promotes the formation of a solid protective passivation layer of iron oxides and phosphates, rather than the non-protective cracked rust layer that develops on most ironwork. A famous example is the Iron Pillar of Delhi, erected by order of Kumara Gupta I around AD 400.

Passivation occurs only if the proportion of chromium is high enough and oxygen is present.Ī few corrosion-resistant iron artifacts survive from antiquity. Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal's internal structure, and, due to the similar size of the steel and oxide ions, they bond very strongly and remain attached to the surface. This iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide and, because of the greater volume of the iron oxide, this tends to flake and fall away. Unprotected carbon steel rusts readily when exposed to air and moisture. Stainless steel differs from carbon steel by the amount of chromium present. Stainless steel is used where both the properties of steel and corrosion resistance are required. There are different grades and surface finishes of stainless steel to suit the environment the alloy must endure. Stainless steel does not readily corrode, rust or stain with water as ordinary steel does but, despite the name, it is not fully stain-proof, most notably under low-oxygen, high-salinity, or poor-circulation environments.

☏)ġ8/8 stainless steel is widely used in petroleum & chemical industry, metallurgical machinery, aerospace industry, food processing equipment, instruments, household appliances and hardware manufacturing industries.ġ8/8 steel is made into a great many intermediate products such as steel sheet & plate, steel tube & pipe, steel bar & flat, rod & wire, etc.įinal products such as all kinds of kitchenware, tableware, medical device, machinery and parts, wire mesh, filter, architectural and decorative metal products, etc.In metallurgy, stainless steel, also known as inox steel or inox from French 'inoxydable', is a steel alloy with a minimum of 10.5% chromium content by mass.

☏)Ĭoefficient of thermal expansion (CTE), 10 -6/K (μin./in.

☏)Įlastic modulus (Modulus of Elasticity), GPa (10 6 psi).

The tables below list 18-8 stainless steel mechanical properties including yield strength, tensile strength, elongation and hardness, etc.ġ8-8 stainless steel physical properties including density, melting point, magnetic, specific heat capacity, electrical resistivity, modulus of elasticity (elastic modulus), thermal diffusivity, thermal conductivity and coefficient of thermal expansion. Chemical Compositionġ8-8 stainless steel composition is given in table below.

18 8 stainless steel strength full#

For full datasheet and specification, please view AISI 304, 304L. The tables below list the 18/8 stainless steel properties including chemical composition, physical and mechanical properties. 18/8 steel is the most widely used material, has excellent corrosion resistance in mild environments, and has good weldability and mechanical properties. The steel containing 18% chromium and 8% nickel includes 304 and its variants 304L, 304N and 304LN. 18/8 stainless steel is also konwn as 304 stainless steel, it refers to the chemical composition of steel containing 18% chromium (Cr) and 8% nickel (Ni).