Effect of alloying elements

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How Hardening Works

Doping strengthens ferrite. Alloying components increase the hardness, strength and toughness, increase the stability of austenite, hardenability, etc. So for steels that serve for the manufacture of turbines, boilers, etc. of equipment, corrosion resistance and heat resistance are of particular importance. The alloying elements can dissolve in ferrite or austenite, form carbides, give intermetallic compounds, settle in the form of inclusions, without interacting with ferrite and austenite or with carbon. Supplier Avlob offers to buy steel alloys at a bargain price. The price is the best in this segment of rental.

Ferrite

Ferrite can dissolve all elements to some extent. Dissolution of alloying additives in ferrite allows hardening of steel without heat treatment. In this case, both the ultimate strength and hardness increase, and the toughness usually decreases. All elements that dissolve in the iron affect the stability of austenite and ferrite. Critical points of alloy steels are shifted under the influence of the quantity and quality of alloying additives. Therefore, when selecting the quenching, normalizing, annealing, and tempering mode, the offset of the critical points should be taken into account.

Manganese and silicon

It is introduced into the smelting process in order to deoxidize the composition. The share of Mn in the structure is up to 2%. It is distributed between cementite and ferrites and significantly increases the cold-brittleness threshold, hardenability and yield strength, but makes the steel sensitive to overheating. Silicon significantly increases the yield strength and strength. Mn and Si are found in virtually all steels. Silicon, along with manganese and aluminum is the main deoxidizer. Mn is also needed to «bind» sulfur and eliminate redness. Additives of these elements usually do not exceed 0.17 — 0.37% Si, 0.3−0.7% Mn and about 0.03% Al. Within these limits, they are considered technological impurities and are not alloying elements.

Delivery, price

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