Конструкциялық материалдар және термоөңдеу Конструкционные материалы и термообработка Constructional materials and heat treatment Учебное пособие для специальности: 5В071200– «Машиностроение»


Carbonaceous steel of ordinary quality



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Carbonaceous steel of ordinary quality. 
Carbonaceous steel are among the most widespread constructional materials. 
The volume of their production reaches 80 % from the general smelting of steel. 
Advantages constructional carbonaceous steel are satisfactory mechanical 
properties in a combination to adaptability to manufacture of processing
shortcomings - high critical speed of training, a small hardness-penetration (to 
15 mm). 
Three groups of carbonaceous is let out: 


194 
- ordinary quality., 
- qualitative (general purpose)., 
- special purpose. 
Carbonaceous steel of ordinary quality are characterized by the considerable 
content of harmful impurity, nonmetallic inclusions and gases. Steel of ordinary 
quality let out in the form of hire. 
Depending on the guaranteed properties of steel are subdivided into three 
groups - A, B, C, on normalized indicators - on six categories. Mark them steel
letters. The indexes standing to the right of number of brand, mean rs-rimming, 
sk-semi-killed and k.s. –killed steel. Between an index and number of brand 
there can be a letter G that means the raised content of manganese. In 
designations of brands to the left of letters of St groups (B and C, the group A is 
not specified) steel. 
For example, St5 Gsk-3 means: steel of group A, the St5 brand with the raised 
content of manganese, semi-killed, the third category. 
There were groups of steel A only with the guaranteed mechanical properties., 
are delivered in the annealed condition without hot processing. Their chemical 
composition isn't regulated. 
There were groups of steel B only with the guaranteed chemical composition., 
use for manufacturing of products with application of hot processing (punching, 
forging). 
Steel of group B have the guaranteed mechanical properties and a chemical 
composition. They are widely applied by production of welded and other 
designs. 


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