Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Si
Mn
P
S
Cr
Ni
0.16-0.25
<=1.0
<=1.0
<=0.040
<=0.030
12.0-14.0
<=1.0
Mechanical Properties
Hardness
<=241 HB
Condition
Annealed, quenched or solution treated plates, sheets and strips (Table 2)
More data from IS 1570 (Part 5):1985
From the standard
Annealed, quenched or solution treated plates, sheets and strips1 properties
Brinell hardness, max
241 HB
Source: IS 1570 (Part 5):1985, Table 2
Annealed, quenched or solution treated bars and flats1 properties
Brinell hardness, max
241 HB
Source: IS 1570 (Part 5):1985, Table 3
Hardened and tempered properties3 properties
0.2 % proof stress, min
490 MPa
Tensile strength
690 to 880 MPa
Elongation, min
14%
Sheets, plates, strips and flats; gauge length 5.65 sqrt(So), flats 3 to 30 mm.
Source: IS 1570 (Part 5):1985, Table 4
Recommended heat treatment5 entries
Annealing temperature
770 to 870 deg C
Annealing cooling medium
furnace
Hardening temperature (Q+T)
980 to 1030 deg C
Hardening quenching medium
oil, air
Tempering temperature
650 to 770 deg C
A annealing, S softening, ST solution treatment, Q quenching, T tempering, P patenting.
Source: IS 1570 (Part 5):1985, Table 7
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