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High-strength low-alloy steel (HSLA) is a type of alloy steel that provides better mechanical properties or greater resistance to corrosion than carbon steel.HSLA steels vary from other steels in that they are not made to meet a specific chemical composition but rather specific mechanical properties.
Stainless steel, also known as inox, corrosion-resistant steel (CRES), and rustless steel, is an alloy of iron that is resistant to rusting and corrosion. It contains iron with chromium and other elements such as molybdenum , carbon , nickel and nitrogen depending on its specific use and cost.
17-4PH is used in applications requiring high strength, hardness, and corrosion resistance up to 300 °C (600 °F). [4]It is commonly used in the aerospace industry for its high strength, and in marine applications for its corrosion resistance, although it can be susceptible to crevice corrosion in stagnant salt water.
They must resist corrosion (usually oxidation) and retain mechanical properties, mostly strength (yield stress) and creep resistance. Corrosion resistance is mostly provided by chromium, with additions of silicon and aluminium. Nickel does not resist well in sulphur containing environments.
The subsequent formation of chromium carbide results in reduced corrosion resistance along the grain boundary, leaving the stainless steel susceptible to unanticipated corrosion in an environment where 304 would be expected to be corrosion resistant. This grain boundary corrosive attack is known as intergranular corrosion. [13]
In addition to the improved corrosion resistance compared with the 300 series duplex stainless steels also have higher strength. For example, a Type 304 stainless steel has a 0.2% proof strength in the region of 280 MPa (41 ksi), a 22%Cr duplex stainless steel a minimum 0.2% proof strength of some 450 MPa (65 ksi) and a superduplex grade a ...
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