IS 1875:1992 Class 6 Steel: Specifications & Listings

IS 1875:1992 Class 6: Class 6 is a carbon steel in IS 1875:1992 for billets, blooms, slabs and bars used to make forgings; its steel designation is 65C6, with 0.60-0.70% carbon and 0.50-0.80% manganese. Normalised, it has a minimum tensile strength of 740 MPa and a minimum yield strength of 370 MPa for sections up to 100 mm. It is made from killed steel; for larger sections or hardened and tempered supply, properties are agreed with the supplier.

Category: Carbon Steel

Grade Details

Grade	IS 1875:1992 Class 6
Standard	IS 1875:1992
Applications	Billets, blooms, slabs and bars for general engineering forgings

Equivalent / Similar Grades

Grade	Standard	Region	Live on M-EX
IS 1570 (Part 2/Sec 1) 65C6	IS 1570 (Part 2/Sec 1):1979	India	No activity yet
BS 970 EN43E	BS 970:1955	UK	No activity yet

Grade ComparisonCompare With a Specific Grade →

Grade	Standard	Match
JIS G3506 SWRH62B	JIS G3506:2004	Strong Match
SAE J403 1065	SAE J403:2014	Strong Match
SAE J403 1065	SAE J403:2001	Strong Match
SAE J403 1065	SAE J403:2009	Strong Match
BS 970 EN43D	BS 970:1955	Strong Match
BS 970 EN43E	BS 970:1955	Strong Match
IS 1570 (Part 2/Sec 1) 60C6	IS 1570 (Part 2/Sec 1):1979	Strong Match
IS 1570 (Part 2/Sec 1) 70C6	IS 1570 (Part 2/Sec 1):1979	Strong Match

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	S	P
0.60-0.70	0.15-0.35	0.50-0.80	<=0.04	<=0.04

Mechanical Properties

Tensile Strength	740 MPa min
Yield Strength	370 MPa min
Elongation	>=10%
Hardness	210 HB min
Condition	as rolled or as forged and normalised, ruling section up to 100 mm
Normalising Temperature	800-830 °C (for information)

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