Countersunk head pull rivet nut is also divided into two kinds of smooth surface and vertical grain, riveted in a thin plate with chamfering, after the installation of its head and thin plate surface parallel.
Countersunk head Angle: 90 ° /120 °
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The main influencing factors of carbon steel are:
1. Manganese: about 0.25%~0.80%.Solid solution strengthening;Remove FeO, reduce the brittleness of steel;Synthesis of MnS with vulcanization can reduce the harmful effects of sulfur.Is good.
2. Silicon: about 0.10%~0.40%, solid solution strengthening;In addition to the adverse effect of FeO on steel quality, it is beneficial.
3, Sulfur: FeS and Fe formed low melting point eutectic (melting point of 985℃), in 1000~1250℃ hot processing lead to brittle steel and cracking, "hot brittle".Harmful.
4, Phosphorus: strength, hardness increase, but reduce the plasticity and toughness, "cold brittle", harmful.
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