Monday, June 17, 2013

Stainless Steel T-316 Vs. T-304


We are frequently asked should I upgrade to T-316 Stainless Steel?
Here is the short and sweet of it!
T-316 Stainless is commonly called “Marine Grade” What gives it the marine grade quality is a lower iron content, Higher Nickel content, and approx. 2.5% Molybdenum. The Molybdenum is added to help against corrosives like Chlorides in sea water and other Sodium based minerals. T-316 has great machinability properties and is softer than T-304 so its much easier on machine tooling and machines faster. T-316 also has a higher heat resistant property that makes it more preferred for pressure vessels and high heat sanitary pipe applications.
T-316 Stainless will ultimately have more resistance to corrosives, but it’s not always necessary. You will most likely see T-316 used in application where there is product contact in biotech, pharma & research facilities, not necessarily food prep facilities. The only food-service application exception to that is where there is salt water fish prep and sea water. “Note that T-316 stainless may be susceptible to pitting when in Chloride warm water applications”
Below is a chemical chart of the two metals:
304 Stainless Steel
Minimum Properties
Ultimate Tensile Strength, psi
73,200
Yield Strength, psi
31,200
Elongation
70%
Rockwell Hardness
B70
Chemistry
Iron (Fe)
66.5 - 74%
Carbon (C)
0.08% max
Chrome (Cr)
18 - 20%
Manganese (Mn)
2% max
Nickel (Ni)
8 - 10.5%
Phosphorus (P)
0.045% max
Sulphur (S)
0.03% max
Silicon (Si)
1% max


316 stainless steel
Minimum Properties
Ultimate Tensile Strength, psi
89,900
Yield Strength, psi
60,200
Elongation
45%
Rockwell Hardness
B91
Chemistry
Iron (Fe)
65%
Carbon (C)
0.08% max
Chrome (Cr)
17%
Manganese (Mn)
2%
Molybdenum (Mo)
2.5%
Nickel (Ni)
12%
Phosphorus (P)
0.045%
Sulphur (S)
0.03% min
Silicon (Si)
1%


Monday, May 6, 2013

Cleaning Stainless Steel Surfaces



















CLEANING

An old household green trick to cleaning a stainless steel surface is to wash
the surface down with soap and warm water and rinse thoroughly. After this
process take the back of a no scratch pad and rubbing with the grain apply a
coat of vinegar over the entire surface and let sit for 2 to 4 minutes. This
will help fight the growth of bacteria that may have set into the small grain
of the sink or countertop. For the next step take a Micro fiber cloth or soft towel
and rub the entire surface that you applied the vinegar to with light olive oil.
This will return your stainless surface to a bright factory appearance.  

REMOVING SCRATCHES

Removing small surface scratches can be tricky to remove and can
damage your surface if not done correctly. For the first step take a 3M
maroon scotch brite pad and with a small amount of water gently
rub in the direction of the grain until you see the scratch disappear.
Adding water will help the scotch brite cut the stainless steel surface
with a more uniform appearance. After this process is complete clean
the area with soap and warm water. For a bright shine re-apply tip #1.  

DAMAGING CHEMICALS

Avoiding certain chemicals on your stainless steel surface will
insure the longevity of your products. Listed below is a range of
chemicals and acids that may cause staining and permanent
surface damage. Hydrochloric acids, Chlorines, Bleaches,
Iodine, Sulfuric Acids, Sodium Chloride, Sodium Chlorite, 
Fluorine,  Ferrous Iodide, Ferrous Chlorides, Uranium Trichloride.
If any of the listed chemicals comes into contact with your
surface rinse thoroughly and repeatedly. 

CHEMICAL DAMAGE AND REPAIR

Professional passivating can help damaged surfaces that have been
affected by chemical damage and or staining. A common sign of
surface damage is an orange or rust like appearance that can be
wiped of with a white towel. For small areas of surface damage or
where stainless steel has come into contact with iron or other steel
materials that may have imbedded into the stainless surface or
have come into contact with caustic chemicals follow these steps.
Taking a roll of quick release construction tape “preferably stucco
tape” make a small dam around the affected area. Fill the dammed
area with concentrated lime juice and leave for up to 5 minutes.
After this process has been complete rinse the entire are thoroughly
and repeat tip #1 again.

RECOMMENDED SURFACE SPRAYS

We recommend Sheila Shine for a fantastic appearance on hoods, and
countertops. This product leaves a great shine without alot of residue
or white film left by most products. A little bit goes a long way with this stuff
and remember to always go with the grain.