www.sefindia.org

[inchak at tatasteel.com]

Dear Mr Mukesh Upadhyay
You Asked"
"what were the ultimate strengths of those samples which you tested"

The data analysed for 255 market samples show the following trend of
UTS/YS Ratio - from which Average approximate UTS can be easily calculated.
The actual data however shows a lot of scatter.
YS Level(MPa) 400 UTS/YS Ratio - 1.29
YS Level(MPa) 500 UTS/YS Ratio - 1.21
YS Level(MPa) 600 UTS/YS Ratio - 1.13
YS Level(MPa) 700 UTS/YS Ratio - 1.06

The above data does not hold for Super Ductile Rebars which are
metallurgically different. for these Super Ductile Rebars some typical data
are:

28mm- YS (Mpa) 458 UTS (Mpa) 585 UTS/YS Ratio 1.28
25mm- YS (Mpa) 473 UTS (Mpa) 601 UTS/YS Ratio 1.27
12mm- YS (Mpa) 449 UTS (Mpa) 579 UTS/YS Ratio 1.29
12mm- YS (Mpa) 429 UTS (Mpa) 591 UTS/YS Ratio 1.38

I will be keen to know if it satisfies the need.
Regards
Indranil Chakrabarti




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