Monthly Archives: March 2019

The most common types of steel: structural steels, free-cutting steels, hardened and tempered steels, and stainless steels

STRUCTURAL STEELS

This is the “heaviest” steel family due to its use in larger quantities because of the applications it is designed for: trusses, large carpentry works, infrastructural works and mechanical organs of various kinds (wheels, racks). S235, S275 and S355 are the main types of steel in this family and are present on the market in all the typical formats of semi-finished products: bars of different section, sheets, tubes and profiles, in the so-called “natural” state or with subsequent normalising treatments such as annealing and stress relieving, in order to optimise the subsequent processing operations and guarantee specific mechanical performances.

FREE-CUTTING STEELS

The steels for high-speed machining, commonly called free-cutting steels, have been specially designed to be machined by chip removal with high productivity.

They are processed by machine tools for shavings removal (turning, milling, drilling, etc.).

Sulfur and lead are the elements that give these steels the peculiarity of encouraging the formation of an appropriately broken chip during processing, in order to speed up work cycles (increasing the productivity of mechanical workshops) and minimise tool wear.

11SMnPb30, 11SMnPb37, 36SMn14 and 46S20 are the main types of free-cutting steels used to make fittings, injectors, mechanical parts, small metal parts and pistons, etc.

STEELS FOR QUENCHING AND TEMPERING

Quenching and tempering are two thermal treatments that increase the mechanical characteristics of steel (tensile strength and hardness) while maintaining a good degree of toughness (i.e. to arrive at the break with a good degree of deformation and not in a fragile manner). C35, C45, 42CrMo4 and 34CrMo4 are the main types of steel in this family and are widely used in various sectors: transport, pistons, transmission parts, gears, screws and bolts, etc. The presence of elements such as chromium and molybdenum gives the steel a greater capacity to push the effects of hardening to the heart of a component, in order to obtain added resistance across the entire mass of a finished component.

STAINLESS STEELS

Stainless steels are most notable for their corrosion resistance. They do not oxidise, forming iron oxide or rust on the surface. This characteristic is conferred by chrome which must be present with a content of at least 12% to develop a thin film of chrome oxide on the surface and protect the steel from corrosion.

They are divided into 5 subfamilies, but there are three main types:

Stainless steel AUSTENITIC chrome-nickel: the progenitor is the so-called 18/10 of pans (AISI 304), which combines resistance to corrosion with excellent cold formability. These steels are non-magnetic.

FERRITIC stainless steels to chrome only: typical applications for car mufflers (AISI 409) and washing machine baskets (AISI 430). They are attracted by magnets.

MARTENSITIC stainless steels with 12% Cr: they can be hardened and tempered and applied in cutting parts (e.g. knife blades, AISI 420) and where surface hardness is required (e.g. pistons).

They are widely used in the food and catering sector due to their hygienic features.

Do I Need Lasik Eye Surgery?

Eyes are an extremely important part of the body. Eyes are also very delicate. So, you should take care of your eyes in a very orderly manner. Lasik surgery can help people with Myopia, Hyperopia, and Astigmatism.

If you have any such problem or an issue with your eyes, you must contact Shreveport Eye Specialists. I am leaving a link for you all to visit and to have accurate information regarding their surgeries and methods https://www.shreveporteyespecialists.com/

Explanation and available procedures

There are many procedures in order to deal with eye issues such as Myopia, Hyperopia, and Astigmatism. In these cases, you must contact the doctor. The doctor will prescribe a Lasik surgery for such conditions.

Improvements in medical science

Nowadays medical science has improved a lot. They have developed painless procedures for all sort of problems, related to the eye. Lasik is another sound procedure that does not convey any hassle to the patient.

Moreover, Shreveport Eye Specialists are the most renowned specialists in dealing with such cases.

Successful surgeries

They have successfully completed many surgeries. The Lasik surgeon Dr. Russ Van Norman has an experience of 18 years. This is the reason; the patients have developed trust in them as they prescribe the most straightforward ways.

Lasik surgery is painful and provides many advantages to the people in need

Lasik surgery has many advantages. People can go through this surgery without facing any pain. The strength of their eyes will increase, providing them with a bright vision.

The surgery is very smooth as people respond to it very quickly. It is a small procedure which generally takes around 10 to 20 minutes.

The method of Lasik surgery is extremely cost-effective. People do not have to spend huge money in order to get their eyes sorted.

A Guide to Compound Interest and its basics

When you enter in the financial word,there are many financial terms that you have to go through. You might have learned them in school or colleges, but as it is a said that implementation starts in the professional life.When you are in school you are just getting the knowledge of technical terms but you will understand that better in your professional life. Now, here is a guide on compound interest that can make you understand well.

What is Interest?

Suppose you submit $1000 to the bank at an interest rate of 10% for a year then bank will return an amount of $1100 at the end of year. The money $100 is an interest amount that you get on your money

Simple Interest

The way of calculating the interest is known as simple interest. Interest is calculated on some rate with the amount of time it is given for. The rate of interest, time taken and principle amount is multiplied to calculate the interest. Hence, there is a formula: Principal*Time*Rate/100

Compound Interest

Compound interest is the growth in the money that is returnedwith interest.It is the interest calculated on the previous interest.It is generally calculated in financial transaction of business.For example: if you submit $1000 to the bank account where you get an interest at 10% rate, after one year if no money is transacted you will get anamount of $1100 that means $100 is the interest money that the bank pays you, another year you will get an interest of 10% on the previous amount that is $1100 or $100. And the bank will pay you $1210.Therefore,compound interest is the interest calculated on interest value. It is calculated yearly, half yearly or quarterly.

The interest rate are not such simple as mentioned in example, it is always advised to hire some professional financial advisor to direct you the pros and cons of investing your money.