🟧 Product Overview

SS400, SS490, and SS540 Structural Carbon Steel Coils are widely used hot‑rolled structural steels under the JIS G3101 standard. SS400 is a mild structural steel with excellent weldability, SS490 provides moderate strength, and SS540 offers higher strength for demanding structural applications.

These grades are commonly used in construction, machinery manufacturing, steel structures, and general engineering applications. International equivalents include ASTM A36 / A572 and EN S235JR / S355JR.

🟧 Standards

• JIS G3101 – SS400 / SS490 / SS540 Structural Steel
• ASTM A36 / A572 (Equivalent)
• EN 10025‑2 S235JR / S355JR (Equivalent)
• GB/T700 Q235B / GB/T1591 Q355B (Equivalent)

Structural Carbon Steel Standard – International Comparison Table

Country	Standard	Common Grades
China	GB/T 700 / GB/T 1591	Q235B, Q275, Q355B/C/D/E
America	ASTM A36 / A572 / A633 / A656	A36, A572 Gr50, A633, A656
Germany	DIN 17100	ST37‑2, ST52‑3
Japan	JIS G3101	SS400, SS490, SS540
France	NF EN 10025	S235JR, S275JR, S355JR
Britain	BS EN 10025	S235JR, S275JR, S355JR
International (EN)	EN 10025‑2	S235 / S275 / S355

🟧 Available Grades

• SS400
• SS490
• SS540
• Equivalent American Grades: ASTM A36 / A572
• Equivalent European Grades: S235JR / S355JR
• Equivalent Chinese Grades: Q235B / Q355B

🟧 Product Specifications & Available Sizes

Dimensions

(International standard display — not affected by Regular Sizes)

• Thickness: 1.8 – 20 mm
• Width: 1000 – 2000 mm
• Coil ID: 508 mm / 610 mm
• Coil OD: 900 – 2000 mm
• Coil Weight: 3 – 15 MT

Regular Sizes (mm)

Size	Size
1.8 × 1250 × C	4.5 × 1500 × C
2.0 × 1250 × C	4.75 × 1500 × C
2.5 × 1250 × C	5.5 × 1500 × C
2.75 × 1250 × C	5.75 × 1500 × C
2.75 × 1500 × C	7.5–11.75 × 1500 × C
3.0 × 1500 × C	5.75 × 1800 × C
3.5 × 1500 × C	5.75 × 2000 × C
3.75 × 1500 × C	7.75 × 2000 × C

🟧 Chemical Composition (JIS G3101 – typical)

SS400

Element	Max (%)
C	0.17
Mn	1.40
P	0.040
S	0.040
Si	0.30

SS490

Element	Max (%)
C	0.18
Mn	1.50
P	0.040
S	0.040
Si	0.35

SS540

Element	Max (%)
C	0.20
Mn	1.60
P	0.040
S	0.040
Si	0.55

🟧 Mechanical Properties

SS400

Property	Value
Yield Strength	≥ 245 MPa
Tensile Strength	400–510 MPa
Elongation	≥ 20%

SS490

Property	Value
Yield Strength	≥ 285 MPa
Tensile Strength	490–610 MPa
Elongation	≥ 18%

SS540

Property	Value
Yield Strength	≥ 330 MPa
Tensile Strength	540–690 MPa
Elongation	≥ 16%

🟧 Physical Properties

• Density: 7.85 g/cm³
• Modulus of elasticity: 200 GPa
• Thermal expansion: 12×10⁻⁶ /K

🟧 Manufacturing Processes

• Hot rolling
• Pickling
• Leveling
• Slitting / Cutting to length
• Surface oiling

🟧 Primary Industry Usage

• Construction and building structures
• Machinery manufacturing
• Steel frames and beams
• General engineering components
• Fabricated structural parts
• Equipment manufacturing

🟧 Why Use SS400 / SS490 / SS540 Structural Carbon Steel Coil

• Excellent weldability and forming performance
• Reliable mechanical strength for structural applications
• Suitable for both mild and high‑strength structural needs
• Widely recognized Japanese structural steel grades

🟧 Why Choose WelSteels

• Full range of structural carbon steel coils
• Consistent dimensional accuracy
• Custom coil cutting and slitting
• SGS / BV inspection available
• Export‑grade seaworthy packaging
• Reliable delivery for global projects