🟧 Product Overview

ASTM A572 Structural Carbon Steel Coil is a high‑strength low‑alloy (HSLA) steel widely used in structural engineering, bridge construction, machinery manufacturing, and heavy equipment fabrication. It offers higher yield strength than mild steel while maintaining good weldability and formability.

A572 is available in Grades 42, 50, 55, 60, and 65, with Grade 50 being the most commonly used for structural applications. Equivalent international grades include EN S355JR, JIS SS490, and GB Q355 series.

🟧 Standards

• ASTM A572 – High‑Strength Low‑Alloy Structural Steel
• EN 10025‑2 S355JR (Equivalent)
• JIS G3101 SS490 (Equivalent)
• GB/T1591 Q355 Series (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

• ASTM A572 Grade 42
• ASTM A572 Grade 50
• ASTM A572 Grade 55
• ASTM A572 Grade 60
• ASTM A572 Grade 65
• Equivalent European Grade: S355JR
• Equivalent Chinese Grade: Q355B / Q355C / Q355D
• Equivalent Japanese Grade: SS490

🟧 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)

(Your provided table)

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 (ASTM A572 Grade 50)

Element	Max (%)
C	0.23
Mn	1.35
P	0.040
S	0.050
Si	0.40
V / Nb / Ti	Micro‑alloyed

🟧 Mechanical Properties (ASTM A572 Grade 50)

Property	Value
Yield Strength	≥ 345 MPa
Tensile Strength	450–620 MPa
Elongation	≥ 18%

🟧 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
• Steel frames and load‑bearing components
• Bridge construction
• Machinery manufacturing
• Engineering equipment
• Fabricated structural parts
• Heavy-duty welded assemblies

🟧 Why Use ASTM A572 / S355JR Steel Coil

• Higher strength than mild steel
• Excellent weldability and toughness
• Suitable for structural and load‑bearing applications
• Reliable performance for large-scale fabrication
• Available in multiple strength levels

🟧 Why Choose WelSteels

• Full range of HSLA structural steel coils
• Precise dimensional control
• Custom coil cutting and slitting
• SGS / BV inspection available
• Export‑grade seaworthy packaging
• Fast delivery from stock and mill production