Stainless Steel
comparison and specification table:
Credit goes to Principal Metals, Crucible Metals, and ESCO Corporation 

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Component elements, these are given as they are known. Many materials maybe missing components in this table, example: every type of stainless is composed of some level of Fe, Iron, yet in many tables the total iron content can only be discern through calculation of what is mentioned, and the rest is of the total is Iron.  Many elements have a range such as the minor amount of Sulfur that may run from .01% to .03% and the alloy still fits within the parameters of 302 stainless. 

An excellent addition to this table is the Materials Web site, which is new and has an extensive and growing list of materials including plastics, tool steels, exotics. Much of this information is very specific and comes directly from the manufacturer of the product. 

Another Stainless Table, we like this one a lot. 

General Description:  Alloy
Links
Chromium
Cr
Nickel
Ni
Carbon
C
Manganese
Mn
Sulfur
S
Molybdenum
Mo
Copper
Cu
Iron
Fe
Silicon
Si
Phosphorus
P
Vanadium
V
Nitrogen
N
Heat
Treating
Micro 
Structure
General purpose, precipitation-hardening, stainless steel, Low temperature (1000 def F approx) "age hardening" produces superior hardness/strength without distortion or scaling. 17-4PH 16% 3%                     Yes Martensitic
Type 302 is a slightly higher carbon version of type 304, most commonly found in strip and wire forms.  More corrosion resistant than 301 due to higher nickel content. Non-magnetic in annealed form, slightly magnetic when cold formed.  302 18% 9% 0.15% 2% 0.03%       1%       No Austenitic
303 is one of the most popular of all the free machining stainless steels. It offers good strength, corrosion resistance and great machinability. 303 17% 8%                     No Austenitic
One of the most widely used and oldest of the stainless steels. This was originally called 18-8 which stood for its chromium and nickel content. It possesses an excellent combination of strength, corrosion resistance and fabricability. 304 18% 8%                     No Austenitic
This austenitic stainless steel has an increased molybdenum content to increase its resistance to corrosion when compared to other 300 series alloys. It will resist scaling at temperatures up to 1600 F. Many of our customer use this material for heat treating applications where hot salt solution is used. 316 is also used in the marine industry because of its resistance to corrosion.  316 16% 10%       2%             No Austenitic
Much like 316 the "L" means "low carbon", the .035% carbon is a MAXIMUM value, in % by weight, and represents what is not removed during steel making.  The advantage of the lower carbon is that it  forms less chromium carbide during welding.  Chromium is what makes stainless steel stainless, if it is tied up as  chromium carbide it cannot  prevent corrosion.  In the old days it was difficult to get down to .035%  so most 316 (and 304) had ~.06% and was subject to "sensitization" during welding. 316L 16% 10% 0.035%     2%             No Austenitic
416 was the first free machining stainless steel. It is a heat treatable chromium steel with excellent machinability and non-galling characteristics. The alloy is magnetic in all conditions. 416 is used a lot in well shafting.  416 12%       0.15%               Yes Martensitic
General Description:  Alloy
Links
Chromium Nickel Carbon Manganese Sulfur Molybdenum Copper       Vanadium Nitrogen Heat
Treating
Micro 
Structure
A basic ferritic non-heat treatable stainless steel. Its strengths are in ductility, formability, good corrosion and oxidation resistance, thermal conductivity and finish quality. 430 16%                       Yes Ferritic
This is a high carbon martensitic stainless with moderate corrosion resistance good strength and the ability to obtain and keep excellent hardness (Rc 60) and wear resistance. This is a common material used in knife making. 440C 12%   0.95%                   Yes Martensitic
AquaMet is a proprietary alloy of Crucible Metals, it is nitrogen enriched, with the addition of manganese, this is highly corrosion resistant alloy with high strength. Used for marine propeller shafts and is polish and ground to size. Most of the AquaMet we are getting is either AquaMet 19 or AquaMet 22.                  
AquaMet 17 is a precipitation-hardening, martensitic stainless steel. Because it is hardened by heat treatment, it provides high strength, regardless of the diameter, combined with good toughness and corrosion resistance. A magnet will stick to AquaMet 17.  AquaMet 17 14.5%-16.5% 3%-5% .07% 1% .03%   3%-5%         Yes Yes Martensitic
AquaMet19 is a modified Type 304 stainless steel that is fully austenitic, slightly-magnetic and strengthened by nitrogen addition, with corrosion resistance better than Type 304 stainless steel. AquaMet 19 18% 9% .08% 2% .03%             Yes No Austenitic
AquaMet 22 is a high-alloy stainless steel that provides superior corrosion resistance along with excellent toughness and high strength. It has higher strength than AQUAMET 17 in diameters of through 1, and equivalent strength in diameters up to 2". Due to its high alloy content, AQUAMET 22 resists pitting and crevice corrosion.  AquaMet 22 20% 12% .06% 5% .03% 1.5%-3%         .1%-.3% Yes No Austenitic
General Description:  Alloy
Links
Chromium Nickel Carbon Manganese Sulfur Molybdenum Copper       Vanadium Nitrogen Heat
Treating
Micro 
Structure

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