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304, 304H, and 304L all possess the same nominal chromium and nickel content and also possess the same corrosion resistance, ease of fabrication, and weldability. The difference between 304, 304H, and 304L is the carbon content, which is < 0.08, < 0.1, and < 0.035% respectively (also see UNS designations S30400, S30409, & S30403 respectively ...
Type 304LN—same as 304L, but also nitrogen is added to obtain a much higher yield and tensile strength than 304L. Type 305—same as 304, but with more nickel to decrease work hardening. Type 308—used as the filler metal when welding 304. Type 309—better temperature resistance than 304, also sometimes used as filler metal when welding ...
Note that a material with a machinability rating less than 100% would be more difficult to machine than B1112 and material and a value more than 100% would be easier. Machinability ratings can be used in conjunction with the Taylor tool life equation, VT n = C in order to determine cutting speeds or tool life. It is known that B1112 has a tool ...
In addition to the descriptive steel grade naming system indicated above, within EN 10027-2 is defined a system for creating unique steel grade numbers. While less descriptive and intuitive than the grand names they are easier to tabulate and use in data processing applications. The number is in the following format: x.yyzz(zz)
303 is an austenitic stainless steel specifically designed to exhibit improved machinability. 303 SE is austenitic chromium-nickel steel to which selenium has been added to improve machinability and non-galling characteristics. [29] 304L is a low-carbon austenitic chromium-nickel steel designed for special applications. [30]
300 series stainless steels are the larger subgroup. The most common austenitic stainless steel and most common of all stainless steel is Type 304, also known as 18/8 or A2. Type 304 is extensively used in such items as cookware, cutlery, and kitchen equipment. Type 316, also known as A4, is the next most common austenitic stainless steel.
Machinability Rating= (Speed of Machining the workpiece giving 60min tool life)/( Speed of machining the standard metal) Machinability ratings can be used in conjunction with the Taylor tool life equation, =, in order to determine cutting speeds or tool life. It is known that B1112 has a tool life of 60 minutes at a cutting speed of 100 sfpm.
The main system used in the United States has been the SAE steel grades numbering system. The SAE numbering system designates stainless steels by "Type" followed by a three-digit number and sometimes a letter suffix. A newer system that was jointly developed by ASTM and SAE in 1974 is The Unified Numbering System for Metals and Alloys (UNS). [57]