Конструкциялық материалдар және термоөңдеу Конструкционные материалы и термообработка Constructional materials and heat treatment Учебное пособие для специальности: 5В071200– «Машиностроение»
жүктеу/скачать 1,99 Mb. Pdf көрінісі
|
- Бұл бет үшін навигация:
- Maraging high-resistance steel
- Spring steel.
| Machine-building improved steel.
It is used mainly after thermal operation - improvement (training and high drawback at a temperature 500-600zs). Improved alloyed steel no more than 5% are characterized by the content of carbon of 0,3-0,5% and alloying elements. Their basic purpose - production of responsible details of the cars operated at influence of cyclic and shock loadings. Therefore they have to possess a high limit of fluidity, low sensitivity to concentration of tension, sufficient viscosity and plasticity. The demanded complex of office characteristics of the steel is provided with their improvement, existence of a through hardness penetration, fine-grained structure and prevention of holiday fragility. Chromic steel 30X, 40X, 50X apply to production of medium load details of cars and mechanisms, industrial equipment. Chromium-silicon manganese steel (chromansil) brands 30HGSA, 35HGSA differ a combination of good mechanical and technological properties. Weld well and stamped. Maraging high-resistance steel. This group treat in a complex alloyed medium-carbon steel after low drawback and thermo mechanical processing, and also maraging steel. Broad application received medium-carbon steel, strengthened by training and the low drawback, having structure of the released marten site. Durability such the steel is defined by the content in them of carbon and practically doesn't depend on alloying elements which enter for improvement of a hardness 200 penetration of steel, stability her ambassador of holiday. The alloying nickel in combination with other elements reduces sensitivity of details from these steel to cuts. Maraging steel - carbon-free (no more than 0,3% C) iron alloys with the nickel, alloyed by cobalt, molybdenum, the titan, aluminum, chrome. Steel of this group are perspective constructional materials. High mechanical properties of these steel are reached at the expense of aging of marten site, an alloying of firm solution and training on air at temperatures 800-860zs. Maraging steel is kept by high mechanical characteristics at low temperatures up to temperatures of the liquefied gases. Such became and are heatproof to 500- 700zs. Advantage of the steel of this class is high technological effectiveness of their processing. They have almost unlimited hardness penetration, well weld, are easily processed by pressure, cutting even in the tempered condition. Spring steel. Steel with high limits of elasticity and the endurance, being combined with their sufficient plasticity and viscosity; apply to production of elastic elements of the general appointment - springs, springs, shock-absorbers, etc. For ensuring demanded operational properties in steel enter not less than 0,5% of carbon, them subject to training and drawback on troostite. Elastic elements of a simple form produce from thermally processed by the steel. Large springs receive the coiling of annealed wire. Spring steel carry to a class of the pearlitic. The basic alloying elements such steel are silicon, manganese, chrome, vanadium, nickel. Siliceous steel 50C2, 55C2, 60C2 have a high limit of fluidity and are used for production of springs of cars, springs, etc. Superficial defects of products from such steel sharply reduce durability of springs. Therefore term of their service raise a superficial cold work. жүктеу/скачать 1,99 Mb. Достарыңызбен бөлісу:
|