1/4 Hard CRS v/s Heat treated CRS
1/4 Hard CRS v/s Heat treated CRS
(OP)
We have some parts that require 1/4 Hard CRS. We are currently developing these parts in China. Our Chinese vendor is asking us if he can use HEAT TREATED CRS that has the same hardness as of 1/4 HARD CRS.
Is there any difference between these two? Thanks.
Is there any difference between these two? Thanks.





RE: 1/4 Hard CRS v/s Heat treated CRS
It's important to consider other mechanical property, such as formability, elongation...etc, rather than just paying too much attention to the hardness.
Best regards,
ct
RE: 1/4 Hard CRS v/s Heat treated CRS
Nothing in the text points to either one or other choice.
If it is indeed work hardened material, hardness would be reduced by any subsequent welding operation. Furthermore heat treatment, besides increasing cost, could generate distortion, decarburization, scale etc.
http://www.welding-advisers.com/
RE: 1/4 Hard CRS v/s Heat treated CRS
RE: 1/4 Hard CRS v/s Heat treated CRS
I would find a standard and specification and use it. SAE specs can be handy since they are relatively detailed. As ASTM can be good too.
RE: 1/4 Hard CRS v/s Heat treated CRS
Mechanical conditions are spelled out in specifications, and ASTM spec number and a condition.
If you are tlaking about a stainless grade, the 1/4 hard name only appears in A666 for flat rolled material. The designation means nothing for other product forms.
= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: 1/4 Hard CRS v/s Heat treated CRS
This is a Cold Rolled Steel for a stamping part. The material spec on the drawing is,
“.0897 +/- .002 thick C.R.S., 1/4 hard.” I don’t have much info (material properties) about the material that our Chinese vendor wants to use, but I believe he wants to use a plain low carbon steel having hardness in the neighborhood of HRB 40-50.
Thanks.
RE: 1/4 Hard CRS v/s Heat treated CRS
Not that the tight tolerance and odd nominal is wrong per-say, just that its going to cost much more. I think this is a difficulty with the parts market. The guys spec. 'ing the steel are rarely if ever, familar with the steel market.
Nick
I love materials science!
RE: 1/4 Hard CRS v/s Heat treated CRS
Sheet/Strip
It looks like his values are within the values given for dead soft material. The only thing is that the material the vendor presents is a very low carbon grade C.R. Steel. If the lower strength of the proposed material doesn’t affect the product I see not problem.Soft max RB 65 / 55 # 5 Temper Stip
1/4 hard RB 60-75 / 60-75 # 3 Temper Strip
RE: 1/4 Hard CRS v/s Heat treated CRS
My guess is that they are a lot different from the heat treated numbers.
= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: 1/4 Hard CRS v/s Heat treated CRS
Mean Tensile Strength
[ul] Psi
Full Hard 80,000
1/2 Hard 64,000
1/4 Hard 54,000
Skin 48,000
Dead Soft 44,000
These values are for A109 1008/1010 C.R. Strip. These values will vary slightly from mill to mill and product,
but not enough to take any special notice.
RE: 1/4 Hard CRS v/s Heat treated CRS
Si<0.1% = rimmed steel
Si>1.5% = killed steel
Good luck!
Best regards,
ct
RE: 1/4 Hard CRS v/s Heat treated CRS
RE: 1/4 Hard CRS v/s Heat treated CRS
Aluminium is also used to kill steel. In fact the Si contents you give seem more to fit electrical steels for motor and transformer windings.
RE: 1/4 Hard CRS v/s Heat treated CRS
You can get Aluminum Killed Steel in most forms but still there is no mention of AL in the analysis.