What is the defference between 4150 steel and 4140 steel?

Answer 1

They each refer to different grades of steel.

The reinforcement steel bars used in RCC (Reinforced Cement Concrete) are designated into grades as Fe415 or Fe500 depending on their Yield Strength.

The numbers 415 and 500 tell about this Yield Strength in N/mm2 the bars are designed and manufactured to have.

Differences between 'Fe415 steel' and 'Fe500 steel':

1. Fe415 has a minimum Yield Strength of 415 N/sq.mm and Fe500 has a minimum Yield Strength as 500 N/sq.mm.
2. The minimum Ultimate Tensile Strength (UTS) of is 485 N/mm2 and that of Fe500 is 545 N/mm2.
3. The minimum Percentage Elongation for Fe415 is 14.5 and that of Fe500 is 12.

Answer 2

The main difference between 4150 and 4140 steel lies in the carbon content and the resulting hardness they offer. 4150 steel contains a higher carbon content, which makes it harder and more wear-resistant compared to 4140 steel. This difference in hardness also affects their respective applications and suitability for different types of tools or components.

Answer 3

The carbon content which is indicated by the last 2 numbers. 4150 contains ~.50% carbon while 4140 contains ~.40%.

Answer 4

1040 is a low carbon steel which contains ~.40% carbon while 4130 is a chrome molybdenum alloy that contains ~.30% carbon.