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« Billet in the solidification reasons by cold rolled steel strip | Class: Steel Global | » Steel Knowledge Channel
11/11/2007 11:26:56 PM
Alloy steel structure on the basis of knowledge
Alloy steel structure in the carbon structure is based on the 5% following one or more of the elements. Steel added alloying elements, the first is to improve the steel hardenability to ensure steel after heat treatment, was good mechanical properties, high strength and enough toughness.
1, in accordance with the different heat treatment process can be divided into:
(1) quenched and tempered steel structure: Many important parts such as the shaft, connecting rod, bolts, and other important, more than in the alternating enormous stress and shock loading, and other work under complex stress and therefore require higher intensity and Toughness of comprehensive mechanical properties. In order to achieve the above request, the steel pieces to be quenched and tempered high temperature treatment (that is quenched and tempered processing), the handling of martensite quenching, and then high-temperature tempering be sorbite organizations. The quenched and tempered steel carbon content in the 0.3-0.5%, carbon is low not hardened, tempered after not required strength; toughness was of high carbon low occurred in the use of brittle fracture.
(2) surface hardening steel: parts made of a heat-through processing can be hard wear-resistant surface layer and flexible appropriate center. If the gear to transmit torque, there must be sufficient strength, also in the process of shifting to bear the shock loading, requires toughness, in the meshing process, gear and bear the wear and there are strong wear resistance, therefore, should have the overall strength Gear high and "Ren within Table hard" performance.
2, by heat treatment process, the main ones being:
(1) benefit low carbon steel case hardening: carbon content in general in the 0.10-0.25%, and the heart of the spare parts to ensure a good toughness. For carburization of structural steel used to <2% 'chromium, <4.5% nickel, 2% manganese ,0.001 - 0.004% boron, can improve Steel hardenability, improve parts of the heart and properties, the ability to raise carburized layer of strength and plasticity; sometimes join the amount of titanium, vanadium, and other elements, from the grain refinement to prevent overheating when carburizing impact.
(2) adoption of nitriding treatment: a structural steel in the steel containing aluminum as 38 CrMoAL a nitriding steel. May aluminum nitride and aluminum nitride are formed, increasing surface hardness and wear resistance.
(3) using high-frequency induction heating carbon steel surface quenching: alloy structural steel on the quality of governance into high-quality steel and high quality steel (steel, followed by the "A"); purposes divided into pressure processing (hot or cold pressure pressure processing processing), and machining steel; not by the supply of heat treatment is divided into state, normalizing, high-temperature tempering or annealing.
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