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IS 1875 Class 4 vs BS 970 (Part 3) 070M55

Strong Match — 87% match based on chemical composition and mechanical property overlap.

IS 1875 Class 4 (IS 1875:1992) and BS 970 (Part 3) 070M55 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Carbon Steel category. IS 1875 Class 4 is typically used for billets, blooms, slabs and bars for general engineering forgings, while BS 970 (Part 3) 070M55 is commonly used for used for springs, blades, wear plates, hand tools, shafts, and cutting components.. IS 1875 Class 4 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 3) 070M55 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 1875 Class 4 vs BS 970 (Part 3) 070M55 is a 87% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 87%.

Frequently Compared With IS 1875 Class 4:
BS 970 (Part 1) 040A10 BS 970 (Part 1) 080A20 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045M10
Match Breakdown
CHEMISTRY MATCH
87%
MECHANICAL MATCH
No shared data
OVERALL
87%
Specifications
Property IS 1875 Class 4 BS 970 (Part 3) 070M55
Standard IS 1875:1992 BS 970 (Part 3):1991
Category Carbon Steel Carbon Steel
C (%) 0.40-0.50 0.50-0.60
Si (%) 0.15-0.35 0.10-0.40
Mn (%) 0.60-0.90 0.50-0.90
S (%) <=0.04 <=0.05
P (%) <=0.04 <=0.05
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property IS 1875 Class 4 BS 970 (Part 3) 070M55
Tensile Strength 620 MPa min Not specified
Yield Strength 320 MPa min Not specified
Elongation >=15% Not specified
Hardness 175 HB min Not specified
Condition as rolled or as forged and normalised, ruling section up to 100 mm Not specified
Normalising Temperature 830-860 °C (for information) Not specified
Bend Test (if ordered) 32 mm square test piece bent round a 64 mm former without fracture Not specified
Typical Applications
IS 1875 Class 4
Billets, blooms, slabs and bars for general engineering forgings
BS 970 (Part 3) 070M55
Used for springs, blades, wear plates, hand tools, shafts, and cutting components.
Can IS 1875 Class 4 Be Substituted With BS 970 (Part 3) 070M55?
IS 1875 Class 4 and BS 970 (Part 3) 070M55 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 070M55 is often considered as a substitute for IS 1875 Class 4 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
IS 1875 Class 4
No active listings currently.
BS 970 (Part 3) 070M55
Round Bar → (2 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 4800–5800 mm (188.98–228.35 in)
On M-EX Right Now
IS 1875 Class 4
0 active listings and RFQs →
BS 970 (Part 3) 070M55
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between IS 1875 Class 4 and BS 970 (Part 3) 070M55?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can IS 1875 Class 4 be substituted with BS 970 (Part 3) 070M55?
IS 1875 Class 4 and BS 970 (Part 3) 070M55 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 070M55 is often considered as a substitute for IS 1875 Class 4 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.