IS 1875:1992 Class 4 Steel: Specifications & Listings

IS 1875:1992 Class 4: Class 4 is a carbon steel in IS 1875:1992 for billets, blooms, slabs and bars used to make forgings; its steel designation is 45C8, with 0.40-0.50% carbon and 0.60-0.90% manganese. Normalised, it has a minimum tensile strength of 620 MPa and a minimum yield strength of 320 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 4
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) 45C8	IS 1570 (Part 2/Sec 1):1979	India	No activity yet
BS 970 EN8D	BS 970:1955	UK	2 listings, 2 RFQs →

Grade ComparisonCompare With a Specific Grade →

Grade	Standard	Match
BS 970 (Part 3) 080A42	BS 970 (Part 3):1991	Strong Match
BS 970 (Part 3) 080A47	BS 970 (Part 3):1991	Strong Match
SAE J403 1042	SAE J403:2014	Strong Match
SAE J403 1045	SAE J403:2014	Strong Match
SAE J403 1042	SAE J403:2001	Strong Match
SAE J403 1045	SAE J403:2001	Strong Match
SAE J403 1042	SAE J403:2009	Strong Match
SAE J403 1045	SAE J403:2009	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
0.40-0.50	0.15-0.35	0.60-0.90	<=0.04	<=0.04

Mechanical Properties

Tensile Strength	620 MPa min
Yield Strength	320 MPa min
Elongation	>=15%
Hardness	175 HB min
Condition	as rolled or as forged and normalised, ruling section up to 100 mm
Normalising Temperature	830-860 °C (for information)
Bend Test (if ordered)	32 mm square test piece bent round a 64 mm former without fracture

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