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The higher nitrogen addition in 200 series gives them higher mechanical strength than 300 series. [9] Alloy 20 (Carpenter 20) is an austenitic stainless steel possessing excellent resistance to hot sulfuric acid and many other aggressive environments which would readily attack type 316 stainless. This alloy exhibits superior resistance to ...
Martensitic stainless steels can be heat treated to provide better mechanical properties. The heat treatment typically involves three steps: [53] Austenitizing, in which the steel is heated to a temperature in the range 980–1,050 °C (1,800–1,920 °F), depending on grade. The resulting austenite has a face-centered cubic crystal structure.
ASTM A490 and ASTM A490M are ASTM International standards for heavy hex structural bolts made from alloy steel.The imperial standard is officially titled Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength, while the metric standard (M) is titled Standard Specification for High-Strength Steel Bolts, Classes 10.9 and 10.9.3, for Structural ...
Fe – Cr Phase diagram. To qualify as stainless steel, Fe-base alloys must contain at least 10.5% Cr. The iron-chromium phase diagram shows that up to about 13% Cr, the steel undergoes successive transformations upon cooling from the liquid phase from ferritic α phase to austeni
Mechanical properties at room temperature of solution-annealed austenitic–ferritic stainless steels ISO desig. EN num. 0.2% proof stress, min Ultimate tensile strength Elongation, min (%) X2CrNiN23-4 1.4362 400 MPa (58 ksi) 600 to 830 MPa (87 to 120 ksi) 25 X2CrNiMoN22-5-3 1.4462 450 MPa (65 ksi) 650 to 880 MPa (94 to 128 ksi) 25
Typical fasteners (US quarter shown for scale) A fastener (US English) or fastening (UK English) [1] is a hardware device that mechanically joins or affixes two or more objects together. In general, fasteners are used to create non-permanent joints; that is, joints that can be removed or dismantled without damaging the joining components. [2]
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