IS 11169 (Part 1):2022 20Cr4 Steel: Specifications & Listings
IS 11169 (Part 1):2022 20Cr4: Cold heading quality alloy case hardening steel 20Cr4 to IS 11169 (Part 1):2022, for parts case hardened after cold heading or cold extrusion, supplied as wire rod, bars or wire of 2 to 100 mm. Maximum tensile strength in the annealed condition is 640 MPa. It can be ordered with hardenability requirements (H, HH or HL).
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Cr
Cu
Mn
P
S
Si
0.17-0.23
0.90-1.20
<=0.25
0.60-0.90
<=0.025
<=0.025
<=0.30
Mechanical Properties
Tensile Strength, annealed (+AC)
<=640 MPa (over 10 to 40 mm)
More data from IS 11169 (Part 1):2022
From the standard
Other composition limitsfrom the table notes and clauses
Values
Maximum unless a range is given (ladle analysis)
Ordered with hardenability
Small deviations from these limits are allowed (not for sulphur and phosphorus): up to 0.01 percent for carbon and the Table 1 values for other elements
Deoxidation
Aluminium killed (clause 6.2)
Elements not listed are not added intentionally without the purchaser's agreement, except those used to finish the heat.
Source: IS 11169 (Part 1):2022, Table B.2 and its notes, clause 6.2
Tensile strength and reduction of area by delivery conditionby delivery condition and size
Delivery condition
Diameter (mm)
Tensile strength, max (MPa)
Reduction of area, min (%)
+AC
over 10 to 40
640
60
+AR+C+AC
over 5 to 10
540
60
+AR+C+AC
over 10 to 40
540
60
+AR+C+AC+LC
over 5 to 10
580
60
+AR+C+AC+LC
over 10 to 40
580
60
+AC+C
over 5 to 10
640
55
+AC+C
over 10 to 40
640
55
Codes: +AR as hot rolled, +PE peeled, +C cold drawn, +AC annealed to spheroidized carbides, +LC skin passed. For non-circular sections the properties are agreed between manufacturer and purchaser. Table B.5 heads the reduction of area columns for +AR+C+AC+LC and +AC+C as maximum; they are shown here as minimum, like every other table of the standard. Printed as shown: +AC is given only for over 10 to 40 mm, at 640 MPa.
Source: IS 11169 (Part 1):2022, Table B.5
Hardenability, end quench test (H)Hardness band
Hardness band (HRC, minimum to maximum) by distance from the quenched end (mm)
1.5
3
5
7
9
11
13
15
20
25
30
35
40
Distance from quenched end (mm)
1.5
3
5
7
9
11
13
15
20
25
30
35
40
Maximum, HRC
49
48
46
42
38
36
34
32
29
27
26
24
23
Minimum, HRC
41
38
31
26
23
21
-
-
-
-
-
-
-
Applies when ordered with the symbol H; otherwise for guidance only. Jominy test as per IS 3848, austenitizing at 900 ± 5 °C.
Source: IS 11169 (Part 1):2022, Table B.6
Restricted hardenability bands, HH and HL (HRC by distance from quenched end, mm)HH and HL ordering
Band
1.5
3
5
7
9
11
13
15
20
25
30
35
40
HH maximum
49
48
46
42
38
36
34
32
29
27
26
24
23
HH minimum
44
41
36
31
28
26
24
22
-
-
-
-
-
HL maximum
46
45
41
37
33
31
29
27
24
22
21
-
-
HL minimum
41
38
31
26
23
21
-
-
-
-
-
-
-
HH: the upper limit matches the H band upper limit; HL: the lower limit matches the H band lower limit. Austenitizing at 900 ± 5 °C.
Source: IS 11169 (Part 1):2022, Table B.7
Active IS 11169 (Part 1):2022 20Cr4 Listings on M-EX (For Sale)