PHYSICAL PROPERTIES AS PER IS-2507

Annealed Hardened & Tempered
Sr.No. Grade Vickers Hardness HV,
Max.
Yield Stress
N/mm²,Min.
Tensile Strength
N/mm²,Max.
Elongation,
Percent
,
Min.
Vickers Hardness HV Min-Max. Yield Stress N/mm²,
Min.
Tensile Strength
N/mm²,
Max.
Elongation,
Percent,
Min., Guage Length 5.65√S°
1 45C 8 185 » 270 590 30 350 to 425 1030 1180 to 1420 6
2 55C 6 195
3 65C 6 205
4 70C 6 215
5 75C 6 220 »
290
640 25 350 to 475 1080 1180 to 1570 6
6 80C 6 220
7 85C 6 220
8 98C 6 225 310 690 25 475 to 540 1470 1570 to 1760 6
9 55Si7 240 340 780 20 475 to 570 1470 1570 to 1960 6
10 50Cr4 240 340 780 20 505 to 650 1570 1670 to 2260 5
11 50Cr4V2 240 340 780 20 555 to 670 1760 1880 to 2360 4

Note 1 – 1 N/mm² == 1MN/m ² == 0.1020 kgf/mm².

Note2 – The values for elongation for gauge length Lₒ == 50 mm and Lₒ == 12.5 mm should be reduced by about one-third the values specified for gauge length Lₒ ==5.65√Sₒ.

Note3 – The strength values for the strips in the hardened and tempered condition depend on the thickness. In view of the fact that the strength values are also influenced by the rolling stresses, the strength properties should be subject to mutual agreement between the purchaser and the supplier.

Note4 – Since slight surface decarburization is unavoidable, the hardness values specified may be considered approximate.

 

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