IS 11169 (Part 1):1984 20NiCrMo2 Steel: Specifications & Listings
IS 11169 (Part 1):1984 20NiCrMo2: Cold heading quality alloy steel 20NiCrMo2 to IS 11169 (Part 1):1984, for case hardening, supplied as wire, wire rod or bars of 2 to 100 mm diameter. Old designation 20Ni55Cr50Mo20. Table 7 of the standard prints it as 20Ni7CrMo2. The standard was reaffirmed in 2004.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Other composition limitsfrom the clauses and notes
Sulphur and phosphorus, maximum
0.035 percent each; other limits by agreement
Elements not specified, maximum
Cr 0.15, Ni 0.15, Cu 0.15, Sn 0.02, Mo 0.05, V 0.05 percent; total 0.40
Narrower carbon and silicon ranges may be agreed between purchaser and manufacturer; elements not listed are not added except by agreement or to finish the heat.
Source: IS 11169 (Part 1):1984, clauses 4.1.2, 4.1.3, 4.2 and 4.4, Table 3 notes
Hardness in the annealed condition1 condition
Annealed, maximum
180 HB
Brinell hardness for products delivered in the annealed condition.
Source: IS 11169 (Part 1):1984, Table 5, clause 8.1
Core properties after case hardeningrefined and quenched
Tensile strength, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Limiting ruling section (mm)
900
11
41
30
800
-
-
60
750
-
-
90
Guidance values (clause 9.2.1) for the core in the refined and quenched condition. Impact value applies when specified. Core properties for wire of 12 mm diameter and below are agreed between purchaser and supplier.
Source: IS 11169 (Part 1):1984, Table 7
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