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IS 1570 (Part 4) 21C10BT vs KS D3752 SM20C

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

IS 1570 (Part 4) 21C10BT (IS 1570 (Part 4):1988) and KS D3752 SM20C (KS D 3752:2024) 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 KS D3752 SM20C is defined under Korean Industrial Standards (KS), originating from South Korea.

As per chemical composition, IS 1570 (Part 4) 21C10BT vs KS D3752 SM20C 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 KS D3752 SM20C
Standard IS 1570 (Part 4):1988 KS D 3752:2024
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 KS D3752 SM20C
Tensile Strength Not specified u2265440 MPa
Yield Strength Not specified u2265245 MPa
Elongation Not specified u226523%
Hardness Not specified u2264149 HB
Typical Applications
IS 1570 (Part 4) 21C10BT
Not documented
KS D3752 SM20C
Shafts, pins, keys, bolts, lightly stressed structural components, general engineering parts
Key Differences
Can IS 1570 (Part 4) 21C10BT Be Substituted With KS D3752 SM20C?
IS 1570 (Part 4) 21C10BT and KS D3752 SM20C overlap closely enough on chemistry and mechanical properties that KS D3752 SM20C 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.
KS D3752 SM20C
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4200–5900 mm (165.35–232.28 in)
On M-EX Right Now
IS 1570 (Part 4) 21C10BT
0 active listings and RFQs →
KS D3752 SM20C
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 21C10BT and KS D3752 SM20C?
IS 1570 (Part 4) 21C10BT specifies B which is not specified for KS D3752 SM20C. KS D3752 SM20C specifies S, P which are not specified for IS 1570 (Part 4) 21C10BT.
Can IS 1570 (Part 4) 21C10BT be substituted with KS D3752 SM20C?
IS 1570 (Part 4) 21C10BT and KS D3752 SM20C overlap closely enough on chemistry and mechanical properties that KS D3752 SM20C 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.