303 Stainless Steel

303 Stainless Steel

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Composition Typical compositional ranges for grade 303 stainless steels are given in table 1. Table 1. Composition ranges for 303 grade stainless steel Grade C Mn Si P S Cr Mo Ni Se 303 min. max. - 0.15 - 2.00 - 1.00 - 0.20 0.15 - 17.0 19.0 - 8.0 10.0 - 303Se min. max. - 0.15 - 2.00 - 1.00 - 0.20 0.06 - 17.0 19.0 - 8.0 10.0 0.15 min Mechanical Properties Typical mechanical properties for grade 303 stainless steels are...


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  • Supply Ability: 10000 Piece/Pieces per Month
  • Port: Shenzhen
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    Composition

    Typical compositional ranges for grade 303 stainless steels are given in table 1.

    Table 1. Composition ranges for 303 grade stainless steel

    Grade

    C

    Mn

    Si

    P

    S

    Cr

    Mo

    Ni

    Se

    303

    min.

    max.

    -

    0.15

    -

    2.00

    -

    1.00

    -

    0.20

    0.15

    -

    17.0

    19.0

    -

    8.0

    10.0

    -

    303Se

    min.

    max.

    -

    0.15

    -

    2.00

    -

    1.00

    -

    0.20

    0.06

    -

    17.0

    19.0

    -

    8.0

    10.0

    0.15

    min

    Mechanical Properties

    Typical mechanical properties for grade 303 stainless steels are given in table 2.

    Table 2. Mechanical properties of 303 grade stainless steel

    Grade

    Tensile Strength (MPa)

    Yield Strength 0.2% Proof (MPa)

    Elongation (% in 50mm)

    Hardness

    Rockwell B (HR B)

    Brinell (HB)

    303

    -

    -

    -

    -

    262 max

    Physical Properties

    Typical physical properties for annealed grade 303 stainless steels are given in table 3.

    Table 3. Physical properties of 303 grade stainless steel in the annealed condition

    Grade

    Density (kg/m3)

    Elastic Modulus (GPa)

    Mean Coefficient of Thermal Expansion (μm/m/°C)

    Thermal Conductivity (W/m.K)

    Specific Heat 0-100°C (J/kg.K)

    Electrical Resistivity (nΩ.m)

    0-100°C

    0-315°C

    0-538°C

    at 100°C

    at 500°C

    303

    8027

    193

    17.3

    17.8

    18.4

    16.3

    21.5

    500

    720

    Grade Specification Comparison

    Approximate grade comparisons for 303 stainless steels are given in table 4.

    Table 4. Grade specifications for 303 grade stainless steel

    Grade

    UNS No

    Old British

    Euronorm

    Swedish SS

    Japanese JIS

    BS

    En

    No

    Name

    303

    S30300

    303S31

    58M

    1.4305

    X8CrNiS18-9

    2346

    SUS 303

    303Se

    S30323

    303S42

    -

    -

    -

    -

    SUS 303Se

    These comparisons are approximate only. The list is intended as a comparison of functionally similar materials notas a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.

    Possible Alternative Grades

    Possible alternative grades to grade 303 stainless steels are given in table 5.

    Table 5. Possible alternative grades to 303 grade stainless steel

    Grade

    Why it might be chosen instead of 303

    304

    Better corrosion resistance, formability or weldability are needed, at the expense of lower machinability.

    316

    Higher resistance to pitting and crevice corrosion is required, in chloride environments. A lower machinability can be accepted.

    416

    Even higher machinability than 303 is needed, and a lower corrosion resistance can be tolerated.

    Or hardening by thermal treatment is required, while maintaining a high machinability.

    Corrosion Resistance

    Good resistance to mildly corrosive atmospheres, but significantly less than Grade 304 due to the sulphur addition; the sulphide inclusions act as pit initiation sites. Grade 303 should not be exposed to marine or other similar environments, as these will result in rapid pitting corrosion. Because the sulphide inclusions in 303 are primarily aligned along the rolling direction the corrosion resistance is particularly reduced in cross-sections.

    Grade 303, like other common austenitic stainless steels, is subject to stress corrosion cracking in chloride containing environments above about 60°C.

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