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304
Carbon .08 Max.
Manganese 2.00 Max.
Phosphorus .040 Max.
Sulphur .030 Max.
Si. 1.00 Max.
Cr.18.00/20.00
Ni. 8.00/10.50
Cu. .75 Max.
Mo. .75 Max. |
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The following specifications are generally applicable:
Sheets & Plates: MIL-S-5059, AMS 5513, ASTM A 167, ASTM A 240
Bars: MIL-S-7720, QQ-S-763, AMS 5639, ASTM A 276, ASTM A 479 |
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| Used where corrosion resistance and good mechanical properties are
primary requirements. These grades are widely accepted in such
industries as dairy, beverage, and other food products where the
highest degree of sanitation and cleanliness is of prime
importance. Parts for handling acetic, nitric, and citric acids,
organic and inorganic chemicals, dyestuffs, crude and refined oils,
etc., are fabricated from this material. Because of its lack of
magnetism it is highly desirable for instruments. It is also widely
used for architectural trim. Type 302 sheets are used in aircraft
applications where corrosion resistance is required, but where gas
or arc welding and elevated temperatures are not involved. Type
304, as noted above, finds particular use in applications requiring
welding. |
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| Types 302 and 304 show good resistance to corrosion. They are
highly resistant to strong oxidizing acids, such as nitric acid,
and resist attack by a wide variety of organic and inorganic
chemicals. Maximum corrosion resistance is obtained in the annealed
condition. Intergranular corrosion may occur when material is
heated within or cooled through the range of 800° to 1500°F. |
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| Excellent scale resistance at temperatures up to 1600°F in
continuous service. Chromium-nickel grades have a high coefficient
of expansion, which should be considered in designing. |
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Applicable specifications require the following properties of
sheets in the annealed condition:
304
Tensile Strength - 100.00 psi Max.
Elongation in 2"( 0.15" Thick and Under) - 40% Min.
Elongation in 2"( 0.16" Thick to .030") - 40% Min.
Elongation in 2"( 0.031" Thick and Over) - 40% Min.
Elongation in 2" - 17% Min.
In practice, annealed sheets and plates will average as follows:
Tensile Strength - 90.00 psi
Yield Strength - 40,000 psiMin.
Elongation in 2" - 50% Min.
Rockwell "B" Hardness 85.0 |
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| Types 302 and 304 have a machinability rating of approximately 45%
with 1212 rated as 100%. Surface cutting speed on automatic screw
machines is approximately 75 feet per minute. |
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| Easily welded by all the commercial processes except forge or
hammer welding. The resulting weld has good toughness and
ductility. Annealing is recommended after welding to maintain
maximum corrosion resistance. |
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| These grades have very good drawing and stamping properties. |
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Annealing range is between 1850° and 2050°F. Cool rapidly
Water should be used for heavier sections; air for lighter
sections.
The stress relieving range is between 400° and 750 °F. Skype:amywang20131 
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