September 28, 2016
By Gilbert VandenHeuvel
At Dwyer Manufacturing Stainless Steel is extensively used as a fastener, plumbing part and mostly as a building material.
But what makes stainless steel so good at what it does? Read on and find out. ,
Stainless steel differs from carbon steel by the amount of chromium present. Unprotected carbon steel rusts readily when exposed to air and moisture. This iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide and because of the greater volume of the iron oxide, this tends to flake and fall away. Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal’s internal structure. Passivization occurs only if the proportion of chromium is high enough and oxygen is present, minimum 13%.
There are different types of of stainless steel. For instance, when nickel is added, stainless become non-magnetic and less brittle at low temperatures. For greater strength and hardness, more carbon is added. When these steels are heat treated the material can be used for products such as razor blades, tools and cutlery.
Most common stainless types are 316 and 304. Each have their own properties and used accordingly.
Type 304—the most common grade; the classic 18/8 (18% chromium, 8% nickel) stainless steel.
Type 316—the second most common grade; for food and surgical stainless steel uses; alloy addition of molybdenum prevents specific forms of corrosion. It is also known as marine grade stainless steel due to its increased resistance to chloride corrosion compared to type 304. 316 is often used for building nuclear reprocessing plants.
Watch video that explains stainless grades click HERE
For a complete list of 304 Stainless fasteners available at Dwyer Manufacturing click HERE.
Manufacturers make either rolls or slabs of stainless which are further processed into forms we see each day.
Click HERE to watch an interesting video on the manufacturing of Stainless Steel.
Helpful tip when using impacts on stainless nuts and bolts:
When using stainless nuts and bolts be careful when using an impact to rapidly tighten or loosen. When using higher force the oxide layer that all stainless has can be scraped off allowing the parts to “weld” together, an effect known as galling. Using dissimilar materials such as bronze and stainless is one way to avoid galling or even different types of stainless (304 and 316) can solve this problem. Most nuts and bolts come in the same stainless type (304 or 18/8) so that usually isn’t an option, cleaning the stainless or using a thread lubricant (moly or graphite) helps reduce the chance of galling or even reducing the speed of the impact to stop friction heat build up. For complete details from Greenslade and Company on galling click HERE. Watch video with the detailed science of galling HERE.
For a complete list of 304 Stainless Plumbing available at Dwyer Manufacturing click HERE.
Stainless Steel Facts:
– In 1872, the Englishmen Clark and Woods patented an alloy that would today be considered a stainless steel.
– Brearley made several variations of his alloys, ranging from 6% to 15% chromium with differing measures of carbon. On the 13th August 1913 Brearley created a steel with 12.8% chromium and 0.24% carbon, argued to be the first ever stainless steel.
– Stainless steel is 100% recyclable. An average stainless steel object is composed of about 60% recycled material of which approximately 40% originates from end-of-life products and about 60% comes from manufacturing processes
– In the beginning stainless steel was sold in the US under different brand names like “Allegheny metal” and “Nirosta steel”. Even within the metallurgy industry the eventual name remained unsettled; in 1921 one trade journal was calling it “unstainable steel.” In 1929, before the Great Depression hit, over 25,000 tons of stainless steel were manufactured and sold in the US.
– Stainless Steel can be magnetic if it contains little or no nickel.
– Stainless Steel can pit and degrade if it is in a non-oxygen environment.
– 88% of the worlds steel is recycled.
– Stainless Steel can be a deodorizing “soap”. Simply rub a stainless bar on your hands after handling garlic, onion, or fish. The smell should disappear. To buy on Amazon click HERE.
– Some manufacturers weave stainless steel fibers into carpet. The stainless steel prevents the buildup of static electricity, reducing the likelihood of static electric shock.
Thanks to James Duva Inc and Wikipedia for information in this Blog.
THE STAINLESS STEEL ADVANTAGE
Here at Dwyer Manufacturing, we specialize in the manufacturing of stainless steel products. Stainless steel is created when a minimum of 10.5% chromium is added to molten steel. Probably the most popular grade out of the many types of stainless steel is 18-8 which that indicates that the steel contains 18% or more chromium and 8% nickel. Stainless steel forms a ‘sacrificial’ layer of chromium oxide on its surface which protects the steel below. Scratches, and cuts ‘self-heal’ by forming a new sacrificial layer making this type of steel very resistant to corrosion and stains all the way through, and not just on the top layer.
There are many advantages to using stainless steel. In addition to corrosion and stain resistance, it has a high strength to weight ratio, which allows a thinner gauge material to provide strength equal to a thicker, heaver gauge of steel. It is easy to cut, bend, weld and machine. Once fabricated, it is virtually maintenance free and has a very long life. It is non-porous and therefore hygienic, hence its popularity in hospitals, restaurants and other areas where sanitation is essential. Aesthetically, it is available in a wide variety of finishes.
Here at Dwyer Manufacturing we believe that the many advantages to using stainless steel outweigh the higher initial cost of materials in a cost-benefit analysis over using regular or galvanized steel: strength, long life and low maintenance.
For more information see the Stainless Steel Information Center at www.ssina.com