Post Stock Login Register

KS D3752 SM20C vs SAE J403 1021

Strong Match — 87.7% match based on chemical composition and mechanical property overlap.

KS D3752 SM20C (KS D 3752:2024) and SAE J403 1021 (SAE J403:2001) are both steel grades. Both fall under the Carbon Steel category. KS D3752 SM20C is typically used for shafts, pins, keys, bolts, lightly stressed structural components, general engineering parts, while SAE J403 1021 is commonly used for chemistry-only grade; product scope as listed in the composition notes. KS D3752 SM20C is defined under Korean Industrial Standards (KS), originating from South Korea, while SAE J403 1021 is defined under SAE International, originating from United States.

As per chemical composition, KS D3752 SM20C vs SAE J403 1021 is a 87.7% 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 87.7%.

Frequently Compared With KS D3752 SM20C:
BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A10 BS 970 (Part 3) 070M20 BS 970 (Part 1) 045A10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15
Match Breakdown
CHEMISTRY MATCH
87.7%
MECHANICAL MATCH
No shared data
OVERALL
87.7%
Specifications
Property KS D3752 SM20C SAE J403 1021
Standard KS D 3752:2024 SAE J403:2001
Category Carbon Steel Carbon Steel
C (%) 0.18-0.23 0.18-0.23
Si (%) 0.15-0.35 Not specified
Mn (%) 0.30-0.60 0.60-0.90
S (%) <=0.035 <=0.050
P (%) <=0.030 <=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 KS D3752 SM20C SAE J403 1021
Tensile Strength u2265440 MPa Not specified
Yield Strength u2265245 MPa Not specified
Elongation u226523% Not specified
Hardness u2264149 HB Not specified
Typical Applications
KS D3752 SM20C
Shafts, pins, keys, bolts, lightly stressed structural components, general engineering parts
SAE J403 1021
Chemistry-only grade; product scope as listed in the composition notes
Key Differences
Can KS D3752 SM20C Be Substituted With SAE J403 1021?
KS D3752 SM20C and SAE J403 1021 overlap closely enough on chemistry and mechanical properties that SAE J403 1021 is often considered as a substitute for KS D3752 SM20C 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
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)
SAE J403 1021
No active listings currently.
On M-EX Right Now
KS D3752 SM20C
2 active listings and RFQs →
SAE J403 1021
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between KS D3752 SM20C and SAE J403 1021?
KS D3752 SM20C specifies Si which is not specified for SAE J403 1021.
Can KS D3752 SM20C be substituted with SAE J403 1021?
KS D3752 SM20C and SAE J403 1021 overlap closely enough on chemistry and mechanical properties that SAE J403 1021 is often considered as a substitute for KS D3752 SM20C in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.