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Steel Grade: AISI —| ASTM -| UNS S31726|Type: Austenitic

CHEMICAL COMPOSITION(UNS S31726):  C(％) :        ≤0.03 Si(％) :         ≤0.75 Mn(％) :         ≤2.00 P(％)≤:         0.045 S(％)≤:         0.03 Cr(％) :         17.0～20.0 Ni(％) :         13.5～17.5 Mo(％) :         4.00～5.00 Other(％) :         Cu≤0.75,N0.10～0.20

MECHANICAL PROPERTIES AND HARDNESS (UNS S31726): Variety②:         B,Sp     P,Sh,St Condition③:         A     A Tensile Strength|σb/MPa :         550     550 Yield Strength|σ0.2/MPa :         240     240 Extensibility|δ(％) :         40     40 Reduction of Area|ψ(％) :         —      — Hardness HRB :         A276     A167,A240 Standard ASTM :        A276      A167,A240

Remark(UNS S31726): 
②, B─Bar；F─forging；P─Thick plate；Sh─Sheet；St─Strip；Pi,T─Pipe steel；S-Pi,T─Seamless Pipe steel； W-T─Welded Pipe；Sp─Shape；W─wire.
③, A─Annealing；HF─Hot Forging；CF--Cold Drawing.
④, The thickness or diameter is more than 13mm.
⑤, The thickness or diameter is more than 13mm.
⑥, The diameter is more than 4mm.
⑦, When the diameter of wire is under 3.96mm, the δ is25％, and ψ is 40％.
⑧, The cross section of forging is above 127mm, then the σb is 485Pa.
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Introduction Stainless Steel (UNS S31726)
Stainless steel does not readily corrode, rust or stain with water as ordinary steel does. However, it is not fully stain-proof in low-oxygen, high-salinity, or poor air-circulation environments. There are different grades and surface finishes of stainless steel to suit the environment the alloy must endure. Stainless steel is used where both the properties of steel and corrosion resistance are required.
Stainless steel differs from carbon steel by the amount of chromium present. Unprotected carbon steel rusts readily when exposed to air and moisture. 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. 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. Passivation occurs only if the proportion of chromium is high enough and oxygen is present.
Applications (UNS S31726)
Stainless steel’s resistance to corrosion and staining, low maintenance and familiar lustre make it an ideal material for many applications. The alloy is milled into coils, sheets, plates, bars, wire, and tubing to be used in cookware, cutlery, household hardware, surgical instruments, major appliances, industrial equipment (for example, in sugar refineries) and as an automotive and aerospace structural alloy and construction material in large buildings. Storage tanks and tankers used to transport orange juice and other food are often made of stainless steel, because of its corrosion resistance. This also influences its use in commercial kitchens and food processing plants, as it can be steam-cleaned and sterilized and does not need paint or other surface finishes.
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