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KS D3503 SS400 vs AS/NZS 3678 Grade 250

Close Alternative — 74.5% match based on chemical composition and mechanical property overlap.

KS D3503 SS400 (KS D 3503:2016) and AS/NZS 3678 Grade 250 (AS/NZS 3678:2016) are both steel grades. Both fall under the Structural Steel category. KS D3503 SS400 is typically used for structural fabrication,bridges,buildings,machinery frames,general construction,welded structures,plates,sections, while AS/NZS 3678 Grade 250 is commonly used for structural fabrication,buildings,bridges,general construction,machinery frames,welded structures,plates. KS D3503 SS400 is defined under Korean Industrial Standards (KS), originating from South Korea, while AS/NZS 3678 Grade 250 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.

As per chemical composition, KS D3503 SS400 vs AS/NZS 3678 Grade 250 is a 97.2% match. As per mechanical properties, the match is 29.2%. Combined, this makes them a close alternative overall at 74.5%.

Frequently Compared With KS D3503 SS400:
CSA G40.21 350W AS/NZS 3679.1 350 CSA G40.21 400W AS/NZS 3679.1 300 GOST 19281 09G2S CSA G40.21 400A CSA G40.21 480W ASTM A1008 SS Grade 50 CSA G40.21 260W CSA G40.21 300W ASTM A1008 SS Grade 80 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
97.2%
MECHANICAL MATCH
29.2%
OVERALL
74.5%
Specifications
Property KS D3503 SS400 AS/NZS 3678 Grade 250
Standard KS D 3503:2016 AS/NZS 3678:2016
Category Structural Steel Structural Steel
C (%) <=0.25 <=0.22
Mn (%) <=1.50 <=1.70
P (%) <=0.050 <=0.040
S (%) <=0.050 <=0.040
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property KS D3503 SS400 AS/NZS 3678 Grade 250
Tensile Strength 400-510 MPa 410-560 MPa
Yield Strength 245 MPa min 250 MPa min
Elongation 21-23 % 22-25 %
Typical Applications
KS D3503 SS400
structural fabrication,bridges,buildings,machinery frames,general construction,welded structures,plates,sections
AS/NZS 3678 Grade 250
structural fabrication,buildings,bridges,general construction,machinery frames,welded structures,plates
Can KS D3503 SS400 Be Substituted With AS/NZS 3678 Grade 250?
KS D3503 SS400 and AS/NZS 3678 Grade 250 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 D3503 SS400
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3000–3700 mm (118.11–145.67 in)
AS/NZS 3678 Grade 250
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2900–3700 mm (114.17–145.67 in)
On M-EX Right Now
KS D3503 SS400
2 active listings and RFQs →
AS/NZS 3678 Grade 250
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between KS D3503 SS400 and AS/NZS 3678 Grade 250?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can KS D3503 SS400 be substituted with AS/NZS 3678 Grade 250?
KS D3503 SS400 and AS/NZS 3678 Grade 250 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.