SAE 1020 and SAE 1008 material properties and stress/strain curve

[gregf84]

Hello,
Does anyone have the material properties for SAE 1020 and SAE 1008 steel or can point me to a good web site for these properties? But I also need the true stress and true strain curves for them too. Thanks.

 

[weldstan]

True stress and true strain curves for each material vary significantly based on a number of processing factors. The initial stress/strain curve is based on Young's Modulus which is the same for both. The ASM Metals Handbook has a number of typical tensile stress/strain curves.

 

[TVP]

gregf84,

It costs ~ $100/specimen to tensile test at an A2LA accredited lab. The output can be true stress-true strain if you ask for the data to be collected.

 

[FennLane]

If you have the engineering stress/strain curves for these materials you can easily estimate the true/stress stain data between yield and maximum tensile stress.

True Strain = ln(1+ engineering strain (At very low strain there is little difference)

True Stress = Engineering Stress * (1 + True Strain)

If you plot the results on a log/log graph you should obtain a straight line.

The slope of this line 'n' would be the work hardening exponent and the intercept on the y axis is 'K' the strength coefficient.

If you are interested in looking at formability and you are carrying out tensile tests then you should be able to determine 'n' quite easily.

It may also help to look a the 'r' value which is a measure of anisotropy and is influenced by a material rolling history.

 

[tbuelna]

SAE 1020 is a material designation assigned by the SAE that describes a plain carbon steel having ~.20% carbon. Other than a general chemistry description, the designation does not define other properties. There are other AMS or ASTM specs that provide more specific requirements of the material chemistry, form, quality, metallurgy, QA, etc.