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IS 1570 (Part 4) 21C10BT vs JIS G4051 S20C

Strong Match — 85.4% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 21C10BT (IS 1570 (Part 4):1988) and JIS G4051 S20C (JIS G4051:2009) are both steel grades. Both fall under the Carbon Steel category. IS 1570 (Part 4) 21C10BT is defined under Bureau of Indian Standards (IS), originating from India, while JIS G4051 S20C is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, IS 1570 (Part 4) 21C10BT vs JIS G4051 S20C is a 85.4% 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 85.4%.

Frequently Compared With IS 1570 (Part 4) 21C10BT:
BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 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) 040A04 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10
Match Breakdown
CHEMISTRY MATCH
85.4%
MECHANICAL MATCH
No shared data
OVERALL
85.4%
Specifications
Property IS 1570 (Part 4) 21C10BT JIS G4051 S20C
Standard IS 1570 (Part 4):1988 JIS G4051:2009
Category Carbon Steel Carbon Steel
C (%) 0.18-0.23 0.18-0.23
Si (%) 0.15-0.30 0.15-0.35
Mn (%) 0.80-1.1 0.30-0.60
B (%) 0.0005-0.003 Not specified
S (%) Not specified <=0.035
P (%) Not specified <=0.030
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property IS 1570 (Part 4) 21C10BT JIS G4051 S20C
Tensile Strength Not specified >=440 MPa
Elongation Not specified >=23%
Hardness Not specified <=149 HB
Typical Applications
IS 1570 (Part 4) 21C10BT
Not documented
JIS G4051 S20C
Shafts, pins, keys, lightly stressed components
Key Differences
Can IS 1570 (Part 4) 21C10BT Be Substituted With JIS G4051 S20C?
IS 1570 (Part 4) 21C10BT and JIS G4051 S20C overlap closely enough on chemistry and mechanical properties that JIS G4051 S20C is often considered as a substitute for IS 1570 (Part 4) 21C10BT 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 1570 (Part 4) 21C10BT
No active listings currently.
JIS G4051 S20C
Round Bar → (5 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 5700–7000 mm (224.41–275.59 in)
On M-EX Right Now
IS 1570 (Part 4) 21C10BT
0 active listings and RFQs →
JIS G4051 S20C
5 active listings and RFQs →
Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 21C10BT and JIS G4051 S20C?
IS 1570 (Part 4) 21C10BT specifies B which is not specified for JIS G4051 S20C. JIS G4051 S20C specifies S, P which are not specified for IS 1570 (Part 4) 21C10BT.
Can IS 1570 (Part 4) 21C10BT be substituted with JIS G4051 S20C?
IS 1570 (Part 4) 21C10BT and JIS G4051 S20C overlap closely enough on chemistry and mechanical properties that JIS G4051 S20C is often considered as a substitute for IS 1570 (Part 4) 21C10BT in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.