Bending Sheet Metal Hardness Or Yield Strangth

The greater the yield strength of the material the greater the spring back and the smaller the angle of the punch die should be designed for the angle of 90 degrees of the bending part.

Bending sheet metal hardness or yield strangth.

The alloy composition of the material is important as well since the addition of alloying elements can significantly affect the mechanical strength of a material. 2 stress strain curve showing total elongation. Offset yield strength and yield by extension under load eul were developed total elon tion offset yield stren yield strength fracture 2 byeul pgortional limit a en neerin strain e fig. This distorts the steel s grain structure which increases its hardness and tensile strength while decreasing ductility.

It is the maximum stress that the sheet metal material is subjected to before pulling out. Aisi 304 grade stainless steel uns s30400 aisi 304 stainless steel uns s30400 is the most commonly used material in stainless steels and is usually purchased in an annealed or cold worked state. In my 40 plus years in the trade i have bent quite a lot of 6061 t6 aluminum. To find the ball park figure for the yield strength convert the hardness number to mpa or psi and divide by 3.

And i ve sometimes performed a three step bend a 2 degree bend in front of the bend centerline a 2 degree bend from behind the bend and then an 86 degree bend in the center. This is an important question when bending sheet metal as every material has its own individual load capacity with regard to yield point and tensile strength. I ve avoided cracking by having a large radius relative to the material thickness. Generally as supplied materials annealed at the haynes international mills have sufficient ductility for mild forming.

Sheet metal fabricators and hammer formers deal with this too. It is one of the indexes of metal strength. Yield strength tensile strength and ductility values for steels at room temperature. The yield strength in tension is about 1 3 of the hardness.

1 automobile bodies such as this ford 500 are dependent on the ability ofsheet metal to. For example take the vickers number which has the dimension kg mm2 and multiply by 10 to approximately convert it to mm2 mpa then divide by three. After a piece of tempered sheet metal or aluminum is worked with a hammer for a while it begins to get hard and brittle so you may need to temper it again to be. Tensile yield strengths and ductilities for some of the plain carbon and low alloy steels are given in the following mechanical properties of steel chart.

Compared to carbon steel for the same thickness of stainless steel the bending angle is larger special attention should be paid to this point otherwise. Because ss 304 contains 18 chromium cr and 8 nickel ni it s also known as 18 8 stainless steel type 304 has good processability weldability corrosion resistance heat resistance low.