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KS D3503 SS400 vs GB/T 700 Q275A

Close Alternative — 70.9% match based on chemical composition and mechanical property overlap.

KS D3503 SS400 (KS D 3503:2016) and GB/T 700 Q275A (GB/T 700:2006) 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 GB/T 700 Q275A is commonly used for hot rolled structural sheets, strips, sections and bars for welding, riveting and bolting engineering. KS D3503 SS400 is defined under Korean Industrial Standards (KS), originating from South Korea, while GB/T 700 Q275A is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, KS D3503 SS400 vs GB/T 700 Q275A is a 94.5% match. As per mechanical properties, the match is 23.8%. Combined, this makes them a close alternative overall at 70.9%.

Frequently Compared With KS D3503 SS400:
CSA G40.21 350W AS/NZS 3679.1 350 AS/NZS 3679.1 300 CSA G40.21 400W GOST 19281 09G2S CSA G40.21 480W CSA G40.21 400A ASTM A1008 SS Grade 50 CSA G40.21 260W CSA G40.21 300W ASTM A1008 SS Grade 80 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
94.5%
MECHANICAL MATCH
23.8%
OVERALL
70.9%
Specifications
Property KS D3503 SS400 GB/T 700 Q275A
Standard KS D 3503:2016 GB/T 700:2006
Category Structural Steel Structural Steel
C (%) <=0.25 <=0.24
Mn (%) <=1.50 <=1.50
P (%) <=0.050 <=0.045
S (%) <=0.050 <=0.050
Si (%) Not specified <=0.35
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 GB/T 700 Q275A
Tensile Strength 400-510 MPa 410-540 MPa
Yield Strength 245 MPa min >=275 MPa
Elongation 21-23 % >=22%
Condition Not specified Hot rolled, controlled rolled or normalized; yield up to 16 mm, elongation up to 40 mm (N/mm2 = MPa)
Typical Applications
KS D3503 SS400
structural fabrication,bridges,buildings,machinery frames,general construction,welded structures,plates,sections
GB/T 700 Q275A
Hot rolled structural sheets, strips, sections and bars for welding, riveting and bolting engineering
Key Differences
Can KS D3503 SS400 Be Substituted With GB/T 700 Q275A?
KS D3503 SS400 and GB/T 700 Q275A 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)
GB/T 700 Q275A
No active listings currently.
On M-EX Right Now
KS D3503 SS400
2 active listings and RFQs →
GB/T 700 Q275A
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between KS D3503 SS400 and GB/T 700 Q275A?
GB/T 700 Q275A specifies Si which is not specified for KS D3503 SS400.
Can KS D3503 SS400 be substituted with GB/T 700 Q275A?
KS D3503 SS400 and GB/T 700 Q275A 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.