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Fastener material introduction

Fasteners mainly carbon steel, stainless steel, copper, three kinds of materials, the most commonly used is carbon steel.
Carbon steel is divided into carbon content of different: low carbon steel, medium carbon steel and high carbon steel and alloy steel.
1, the low carbon steel (C% ≤ 0.25%) for the 4.8 major bolt and nut, 4 small screws without hardness requirements of the product.
2, carbon steel (0.25%
3, the high carbon steel (C%>0.45%), because of its high hardness, processing performance is not good, seldom use.
4, the alloy steel: addition of alloying elements in plain carbon steel (such as Mn, Cr, Mo), add some special properties of steel.
In general, class 8.8 bolts used 35 steel, 45 steel; 35CrMo with 10.9 grade bolt; 40Cr; 35CrMo with 12.9 bolts, 42CrMo.