Why do they call it "Stainless Steel"?

Why do they call it "Stainless Steel"?

Because It does not rust and is non magnetic.

Although stainless steel is much more resistant to corrosion than ordinary carbon or alloy steels, in some circumstances it can corrode. It is 'stain-less' not 'stain-impossible'. In normal atmospheric or water based environments, stainless steel will not corrode as demonstrated by domestic sink units, cutlery, saucepans and work-surfaces.

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In more aggressive conditions, the basic types of stainless steel may corrode and a more highly alloyed stainless steel can be used

History of Stainless Steel

In 1913, English metallurgist Harry Brearly, working on a project to improve rifle barrels, accidentally discovered that adding chromium to low carbon steel gives it stain resistance. In addition to iron, carbon, and chromium, modern stainless steel may also contain other elements, such as nickel, niobium, molybdenum, and titanium.

Nickel, molybdenum, niobium, and chromium enhance the corrosion resistance of stainless steel. It is the addition of a minimum of 12% chromium to the steel that makes it resist rust, or stain 'less' than other types of steel. The chromium in the steel combines with oxygen in the atmosphere to form a thin, invisible layer of chrome-containing oxide, called the passive film. 

The sizes of chromium atoms and their oxides are similar, so they pack neatly together on the surface of the metal, forming a stable layer only a few atoms thick. If the metal is cut or scratched and the passive film is disrupted, more oxide will quickly form and recover the exposed surface, protecting it from oxidative corrosion. (Iron, on the other hand, rusts quickly because atomic iron is much smaller than its oxide, so the oxide forms a loose rather than tightly-packed layer and flakes away.) 

The passive film requires oxygen to self-repair, so stainless steels have poor corrosion resistance in low-oxygen and poor circulation environments. In seawater, chlorides from the salt will attack and destroy the passive film more quickly than it can be repaired in a low oxygen environment.

What is stainless steel used for?

Stainless steels of various kinds are used in thousands of applications. The following gives a flavour of the full range:

Domestic – cutlery, sinks, saucepans, washing machine drums, microwave oven liners, razor blades
Architectural/Civil Engineering – cladding, handrails, door and window fittings, street furniture, structural sections, reinforcement bar, lighting columns, lintels, masonry supports

Transport – exhaust systems, car trim/grilles, road tankers, ship containers, ships chemical tankers, refuse vehicles

Chemical/Pharmaceutical – pressure vessels, process piping.

Oil and Gas – platform accommodation, cable trays, subsea pipelines.

Medical – Surgical instruments, surgical implants, MRI scanners.

Food and Drink – Catering equipment, brewing, distilling, food processing.

Water – Water and sewage treatment, water tubing, hot water tanks.

General – springs, fasteners (bolts, nuts and washers), wire.

Add your own answer in the comments!

Video Clip of Polishing Stainless Steel - Stainless Steel Blog

Video Clip of Polishing Stainless Steel - Stainless Steel Blog

Regardless of what polishing method you use, the stainless steel piece being polished should be clean before you start.

www.polishup.com.au or www.polish-up.com Polishing Stainless Steel & Repairing.

Perforated Decorative Opening Metal Sheet Stainless Stel

Perforated stainless steel sheetsPerforated Decorative Opening Metal Sheet Stainless Stel

Perforated Stainless Steel

Perforated stainless steel sheets can be used in many different applications; including screens, diffusers, guards, ventilation, and even decoration.

Features: Perforated sheets are lightweight, attractive, economical, and is easily customizable. A variety of hole patterns, materials and gauges are available for the customers choice.

Perforated stainless steel sheetsPatterns for Perforated Stainless Steel: The perforated round hole pattern is the most popular style for metal sheets, but it is also available in square and slotted holes.

Uses: Stainless steel perforated sheets are perfect for ventilation, protection and decoration. It is manufactured from stainless steel sheets that are pressed through a die with the appropriate hole size pattern.
Perforated stainless steel sheets

Materials: Stainless Steel.

Sizes and Specification: We can manufacture perforated metal sheets according to your specific demands. Contact us for detail.

SUS 304 Punched Plate

Perforated stainless steel sheetsSUS Punching Plate is a kind of round hole perforated metal in stainless steel 304 or 316 grade. SUS316 and 304 stamping metal is popular for fabricating of stainless steel filter elements and cartridges in industrial uses like chemical fiber and pharmacy. The punched stainless steel can be made into filter cylinders and baskets.

Hengda offers both SUS304 and 316 metal sheets for customer choice. The plate thickness is 0.5mm or custom size. Punching hole size is 0.1mm for filtration layer of the filter cartridges. The hole can be stamped and punched in big opening if the punched metal plate works as supporting layer for the filter elements instead of filter layer media. The Pitch size : 0.5mm or custom size. The plate sheet size: 500x500mm. All specifications can be made upon request. SUS punching plate is made of stainless steel sheet which has good corrosion and acid resistance.

SUS Punching Metal Plate can be supplied in various grades of stainless steel, with specifications as below:
Material: Stainless steel SUS304,304L,316,316L, etc.
Plate Thickness: 0.03-5.0mm
Hole size: 0.2-10mm
Sheet size: 1 X 2 meters. 
0,915 x 2.44 (3 'x 8') 
1.22 X 2.44 (4 'x 8') 
0,915 x 3.05 (3 'x 10') 
1.22 x 3.05m (4 'x 10')

Major Applicationsof stainless steel punching plate:
Air and Oil Filters;
Screening process for Grain;
Hammer Mills, Etc.

What are the properties of 316L Stainless Steel

Marissa Jameson: What are the properties of "316L Stainless Steel"?

I am looking into buying a plain wedding band that is 2mm wide and it is made of 316L Stainless Steel and I wanted to know if this specific type of stainless steel is sturdy, if it rusts or corrodes or changes colors over time, and anything else that may be important to know regarding something that I will be wearing every day.

Best answer properties of "316L Stainless Steel"

Stainless Steel - Grade 316L - Properties, Fabrication and Applications (UNS S31603)

Chemical Formula

Fe, <0.03% C, 16-18.5% Cr, 10-14% Ni, 2-3% Mo, <2% Mn, <1% Si, <0.045% P, <0.03% S


Grade 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments.

Grade 316L, the low carbon version of 316 and is immune from sensitisation (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components (over about 6mm). There is commonly no appreciable price difference between 316 and 316L stainless steel.

The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.

Compared to chromium-nickel austenitic stainless steels, 316L stainless steel offers higher creep, stress to rupture and tensile strength at elevated temperatures.

Key Properties

These properties are specified for flat rolled product (plate, sheet and coil) in ASTM A240/A240M. Similar but not necessarily identical properties are specified for other products such as pipe and bar in their respective specifications.

317L Stainless Steel: Higher resistance to chlorides than 316L, but with similar resistance to stress corrosion cracking.

Corrosion Resistance

Excellent in a range of atmospheric environments and many corrosive media - generally more resistant than 304. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to potable water with up to about 1000mg/L chlorides at ambient temperatures, reducing to about 500mg/L at 60°C.

316 is usually regarded as the standard “marine grade stainless steel”, but it is not resistant to warm sea water. In many marine environments 316 does exhibit surface corrosion, usually visible as brown staining. This is particularly associated with crevices and rough surface finish.

Another Answer by nand_r

Ya..its a biomaterial.It has improved corrosion resistance because of its reduced carbon content.alloying elements are iron,chromium,nickel,molybdenum,manganese.
When u buy see that chromium content is above 11% to enable resist corrosion and also sufficient molybdenum because it resists pitting corrosion.and only cold worked 316L has greater tensile strength than annealed

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