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304 stainless steel pipes. SAE 304 stainless steel is the most common stainless steel. It is an alloy of iron, carbon, chromium and nickel.
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.
The SAE steel grades system is a standard alloy numbering system (SAE J1086 ... Type 305—same as 304, but with more nickel to decrease work hardening.
American steel grades : AISI/SAE steel grades standard; British Standards; ... 304 [8] S30400: X5CrNi18-9 X5CrNi18-10 XCrNi19-9: 304S 15 304S 16 304S 18 304S 25 En58E:
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).
SAE 316 stainless steel is a molybdenum-alloyed steel and the second most common austenitic stainless steel (after grade 304). It is the preferred steel for use in marine environments because of its greater resistance to pitting corrosion than most other grades of steel without molybdenum. [1]
They provide better corrosion resistance, particularly chloride stress corrosion and chloride pitting corrosion, and higher strength than standard austenitic stainless steels such as A2/304 or A4/316. The main differences in composition, when compared with austenitic stainless steel is that duplex steels have a higher chromium content, 20–28% ...
For example: UNS S30400 (SAE 304, Cr/Ni 18/10, Euronorm 1.4301 stainless steel) could be used to make stainless steel bars or stainless steel plates for pressure vessels or pipes . Conversely, A312 pipes could be made out of about 70 different UNS alloy steels.