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1.4305, DIN X8CrNiS18-9, AISI 303
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1.4305, DIN X8CrNiS18-9, AISI 303
Designation by Standards
|Brand Name||LH No.||Mat. No.||DIN||EN||AISI|
Chemical Composition (in weight %)
|max. 0.10||max. 1.00||max. 2.00||18.00||-||9.00||-||-||max. Cu=1.00|
303 is one of the most popular of all the free machining stainless steels. It offers good strength, corrosion resistance and great machinability. It will resist scaling at temperatures up to 871oC.
Used in an incredibly wide variety of parts both in screw and general machining industries. Applications include hardware, fasteners, valve parts, nozzles and trim. For the food processing industry, dairies, fotographic industry, for paint,soap, paper and textile production.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 203, 186 (200oC), 172(400oC)
Density [g/cm3]: 7.9
Thermal conductivity [W/m.K]: 14.6
Electric resistivity [Ohm mm2/m]: 0.73
Specific heat capacity[J/g.K]: 0.502
Coefficient of Linear Thermal Expansion 10-6 oC-1
Harden from a temperature of 1020-1070oC followed by water quenching. Structure is austenite with small ferrite component.
Mechanical properties in solution-annealed condition and reistance to intercrystalline corrosion
Hardness: 130-190 HB
0.2 % proof stress: 190 N/mm2 (for d<=160)
1.0 % proof stress: 225 N/mm2 (for d<=160)
Tensile strength: 510-750 N/mm2
Elongation: 35% (for d<=160, longit.)
Resistance to interystalline corrosion: no (in as delivered condition), no (in sensitised condition)
Note: Sensitisation treatment for 15 min at 700oC with subsequent cooling in air.
Mechanical Properties At Elevated Temperatures
|0.2 % proof stress in N/mm2||176||155||136||125||121||119||118|
Hot forming temperature: 1150-850oC.
Excellent speeds and feeds are capable with this material. The addition of sulfur causes a very brittle chip. Many companies now offer premium machinability grades, such as CarTech with their Project 70 and 7000 series.
Resistant to a variety of organic and inorganic chemicals, fresh water and atmospheric corrosion.
Although not recommended, welding may be performed if low temperatures are employed. Recommended filler metal is AWS E/ER312. At high temperature, the sulfur in 303 tends to precipitate at the weld boundary resulting in weak and brittle joints.
Minor deformation is possible with this alloy, although it is not its strong point. Type 303 Se is superior in this aspect.
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