Three Key Factors to Understand Machinability of Carbon and Alloy Steel
Cold Work, Thermal Treatments, and Chemical Composition are three major determinants of the machinability of steel.
Cold Work, Thermal Treatments, and Chemical Composition are three major determinants of the machinability of steel.
Three primary criteria for selecting bar steels are 1) suitability for end use, 2) suitability for manufacturing process, 3) economical delivery of the requirements. Buyers may want to get the cheapest price per pound of steel purchased; Savvy buyers want to buy the steel that results in the lowest cost per finished part- assuring that costs are minimized for the total cost of production of their product.
Nonmetallic Inclusions are normally expected in plain carbon and alloy steels. Here are 13 facts to know about inclusions in steel.
1) Martensite is the hardest and most brittle microstructure obtainable in a given steel.
2) Martensite hardness of the steel is a function of the carbon content in that steel.
3) Martensite results from cooling from austenitic temperatures rapidly by pulling the heat out using a liquid quenchant before pearlite can form.
4) As quenched Martensitic structures are too brittle for economic use-they must be tempered.
5) Reheating as quenched Martensite to a temperature just below the AC1 results in the best combinations of strength and toughness.
Five reasons to anneal steel include:To alter the grain structure;
To develop formability;
To improve machinability;
To modify mechanical properties;
To relieve residual stresses.
Manganese contributes to a steel’s strength, mechanical properties, hardenability, deoxidation, machinability, and reduces hot cracking (hot shortness) during hot rolling.
Don’t confuse hardness and hardenability. Hardness is a material property. Hardenability is a way to indicate a material’s potential to be hardened by thermal treatment.