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KS D3752 SM20C vs BS 970 (Part 1) 040A12

Close Alternative — 81.8% match based on chemical composition and mechanical property overlap.

KS D3752 SM20C (KS D 3752:2024) and BS 970 (Part 1) 040A12 (BS 970 (Part 1):1991) 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 BS 970 (Part 1) 040A12 is commonly used for as-rolled, or as-rolled and softened, steel (section two). KS D3752 SM20C is defined under Korean Industrial Standards (KS), originating from South Korea, while BS 970 (Part 1) 040A12 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, KS D3752 SM20C vs BS 970 (Part 1) 040A12 is a 81.8% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 81.8%.

Frequently Compared With KS D3752 SM20C:
BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A10 BS 970 (Part 1) 080A20 BS 970 (Part 3) 070M20 BS 970 (Part 1) 045A10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 040A04 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
Match Breakdown
CHEMISTRY MATCH
81.8%
MECHANICAL MATCH
No shared data
OVERALL
81.8%
Specifications
Property KS D3752 SM20C BS 970 (Part 1) 040A12
Standard KS D 3752:2024 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.18-0.23 0.10-0.15
Si (%) 0.15-0.35 Not specified
Mn (%) 0.30-0.60 0.30-0.50
S (%) <=0.035 Not specified
P (%) <=0.030 Not specified
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 BS 970 (Part 1) 040A12
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
BS 970 (Part 1) 040A12
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can KS D3752 SM20C Be Substituted With BS 970 (Part 1) 040A12?
KS D3752 SM20C and BS 970 (Part 1) 040A12 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
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)
BS 970 (Part 1) 040A12
No active listings currently.
On M-EX Right Now
KS D3752 SM20C
2 active listings and RFQs →
BS 970 (Part 1) 040A12
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between KS D3752 SM20C and BS 970 (Part 1) 040A12?
KS D3752 SM20C specifies Si, S, P which are not specified for BS 970 (Part 1) 040A12.
Can KS D3752 SM20C be substituted with BS 970 (Part 1) 040A12?
KS D3752 SM20C and BS 970 (Part 1) 040A12 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.