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2. Marine grade stainless - Wikipedia

   en.wikipedia.org/wiki/Marine_grade_stainless

   Marine grade stainless alloys typically contain molybdenum to resist the corrosive effects of NaCl or salt in seawater. Concentrations of salt in seawater can vary, and splash zones can cause concentrations to increase dramatically from the spray and evaporation. SAE 316 stainless steel is a molybdenum - alloyed steel and the second most common ...

3. 440C - Wikipedia

   en.wikipedia.org/wiki/440C

   440C (UNS designation S44004) is a martensitic 400 series stainless steel, [1] and has the highest carbon content of the 400 stainless steel series. It can be heat treated to reach hardness of 58 to 60 HRC. It can be used to make rolling contact stainless bearings, e.g. ball bearings and roller bearings. It is also used to make knife blades .

4. Martensitic stainless steel - Wikipedia

   en.wikipedia.org/wiki/Martensitic_stainless_steel

   Tweezers made of 410 martensitic stainless steel. Martensitic stainless steel is a type of stainless steel alloy that has a martensite crystal structure. It can be hardened and tempered through aging and heat treatment. The other main types of stainless steel are austenitic, ferritic, duplex, and precipitation hardened.

5. Austenitic stainless steel - Wikipedia

   en.wikipedia.org/wiki/Austenitic_stainless_steel

   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.

6. Amazon River - Wikipedia

   en.wikipedia.org/wiki/Amazon_River

   Topography of the Amazon River Basin. The Amazon River ( UK: / ˈæməzən /, US: / ˈæməzɒn /; Spanish: Río Amazonas, Portuguese: Rio Amazonas) in South America is the largest river by discharge volume of water in the world, and the longest or second-longest river system in the world, a title which is disputed with the Nile.

7. Steel grades - Wikipedia

   en.wikipedia.org/wiki/Steel_grades

   American Petroleum Institute (API) steel grades Color coding. In order to clearly distinguish the steel grade, tubing, casing and its coupling should be painted with color codes respectively. Color bands should be painted on tubing and casing body longer than 600mm to either end. The whole outer-body of the coupling needs to be painted color ...