Metal Stainless Steel Flashcards
chromium-oxide film provides:
corrosion resistance
if chromium-oxide film is scratched,
reforms as exposed to air.
stainless steel labeled by:
AISI (American Iron and Steel Institute)
Type 302:
traditionally most widely used.
Type 304:
largely replaced 302 bc of improved weldability.
Type 301:
advantage is improved high tensile strengths.
sim 302, smaller amounts chromium/nickel.
Type 316:
for extreme corrosive environments,
(marine/industrial plants)
higher % nickel, includes molybdenum.
Type 430:
no nickel. less corrosion resistant. int only.
stainless steel finishes:
No. 3:
intermediate, dull. coarse > #4.
stainless steel finishes:
No. 4:
gen-purpose polished, dull.
no mirror reflection.
frequent use.
stainless steel finishes:
No. 6:
dull satin.
stainless steel finishes:
No. 7:
reflective polished.
stainless steel finishes:
No. 8:
most reflective. mirrors/reflectors.
seldom gen apps.
stainless steel finishes:
organic coatings:
acrylic/plastic based enamels, fairly elastic.
stainless steel finishes:
inorganic coatings:
porcelain enamel, less elastic, add color.
steels designated by ASTM
alloy steels
ASTM A36:
most common type of structural steel
min yield point 36,000lb/in^2
carbon content 0.25-0.29%
ASTM A440:
high-strength for bolted/riveted structures
ASTM A441:
high-strength,
low alloy manganese vanadium steel,
for welded construction.
weathering steel:
contains small amounts of copper,
develops protective oxide coating,
sepia finish.
detailed so runoff does not stain other materials.
