chemical annalysis 1

[danava71]

Hello all, I have two analysis of two samples of parts of a farming machinery and I want you to help me to find what type of steel are. Here you will find the results of the chemistry.
SAMPLE ONE: 0.366 C; 0.77 Mn; 0.256 Si; 0.011 P; 0.036 S; 0.81 Cr; 0.085 Ni; 0.014 Mo; 0.262 Cu; 0.004 Al
SAMPLE TWO: 0.337 C; 0.69 Mn; 0.205 Si; 0.010 P; 0.018 S; 0.11 Cr; 0.115 Ni; 0.017 Mo; 0.211 Cu; 0.0024 Al
I hope you can help.
Thanks in advance
Best regards
Daniel Nava

 

[MetalHead83]

Looks like sample 1 is a 5135, if I had to guess...
(ASTM)5135:
0.33–0.38 C; 0.60–0.80 Mn; 0.035 max P; 0.040 max S; 0.15 to 0.35 Si; 0.80–1.05 Cr. no added Ni or Mo


not sure on teh second one... no Boron detected on sample 1?

 

[MetalHead83]

The second sample might be a 1035, I think ASTM allows .35 max Si and the other elements seem to be low enough

 

[metengr]

These are also copper-bearing steel grades, by request or customer specification, for increased corrosion resistance.

 

[MetalHead83]

Metengr makes a good point.
Per ASTM A29

"When copper is required 0.20
min is generally used"

since both of these are barely over .2, it seems like this amount of copper was intentional.

 

[arunmrao]

metengr has a valid point,but what if a lot of automobile scrap was used in making the steel,copper could have easily come in. If it were a casting,some casters add copper to improve fluidity.

_____________________________________
"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year

 

[Guest102023]

I think there is a second part to the question coming, which is: 'is this stuff weldable?'

 

[blacksmith37]

This is typical of "mini mill", 100% scrap. I bet the copper (and other stuff was just in poorly sorted scrap. The high S indicates these are not sophisticated mills. ( Low S is 0.002)

 

[TVP]

Based on the end use, I doubt that the Cu is intentionally added. Combined with the relatively high Ni & Mo, this amount of Cu indicates the steel originated from an electric arc furnace using 100% scrap charging, hence the mini-mill designation from blacksmith37. The first composition meets the requirements of grade 5135 according to ASTM A29, while the second meets the requirements of grade 1035. The elevated S is probably a purposeful addition for increased machinability, assuming that these some type of forging or machined-from solid round part.