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Stainless Steel SS303 / W.Nr. 1.4305

Country/Region china
Company Tianjin Xinhairunda Trade Co.,LTD
Categories Stainless Steel Turned Parts
Telephone 86-022-58883501 58883136,0302035109910018113
ICP License Issued by the Chinese Ministry
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    Stainless Steel SS303 / W.Nr. 1.4305

    • Descripe

    Alloy 303 (UNS S30300) is an austenitic stainless steel developed for applications requiring extensive machining operations. The alloy has a sulfur addition which assists in breaking up turnings while reducing drag on the cutting tool when compared to the machining characteristics of the conventional 18-8 stainless steels.

    The alloy is nonmagnetic in the annealed condition , but may become slightly magnetic as a result of cold working. The addition of sulfur negatively impacts the corrosion resistance of 303 making it less resistant than 304 to mildly corrosive environments.

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    • Aerospace Parts
    • Fittings
    • Pump and Valve Components
    • Screw Machine Products

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    ASTM .......... A 895

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    Corrosion Resistance
    Alloy 303 is resistant to mildly corrosive environments. However, the alloy’s corrosion resistance is inferior to 304 in most applications. Its corrosion resistance is superior to 416, another free-machining grade, but is somewhat inferior to other 400 series stainless steels which do not contain higher sulfur levels. In order to obtain optimal corrosion resistance, it is recommended that Alloy 303 be chemically treated to remove sulfides from the final surfaces.

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    Chemical Analysis

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    Physical Properties

    0.285 lbs/in3
    7.89 g/cm3
    Specific Heat
    0.12 BTU/lb-°F (32 212°F)
    502 J/kg-°K (0 100°C)

    Modulus of Elasticity
    28.0 x 106 psi
    193 GPa

    Thermal Conductivity 212°F (100°C)
    112 BTU/hr/ft2/ft/°F
    16.2 W/m-°K

    Melting Range
    2500 2590°F 1480 1530°C

    Electrical Resistivity
    28.3 Microhm-in at 68°C
    72.0 Microhm-cm at 20°C

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    Mechanical Properties
    Typicals Values at 68°F (20°C)

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    Fabrication Data
    Heat Treatment

    Annealing Heat to a minimum temperature of 1900oF (1038oC) and water quench or rapid cool by other means.

    Hardening Alloy 303 cannot be hardened by thermal treatment, it can only be hardened by cold working.

    Cold Forming
    The cold formability of Alloy 303 is adversely impacted by the high sulfur content. The alloy may be bent with a generous bend radius, however, when cold forming is required, 304 should be utilized.

    Hot Forming
    The high sulfur content of Alloy 303 also has a detrimental impact on hot workability. If hot forming is required, once again, 304 should be considered as an alternate selection.

    Alloy 303 was developed specifically for ease of machining. The sulfur addition assists in breaking up turnings which reduces drag on the cutting tool. It produces small brittle chips and may be machined at high speeds with deep cuts and heavy feeds.

    The table below suggests speeds and

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