S420 Chemical composition table

Element	S420ML (%)	S420MC (%)
Carbon (C)	0.12 – 0.20	≤ 0.12
Manganese (Mn)	0.50 – 0.80	≤ 1.60
Silicon (Si)	-	≤ 0.50
Phosphorus (P)	≤ 0.025	≤ 0.025
Sulfur (S)	≤ 0.025	≤ 0.015
Nickel (Ni)	≤ 0.35 (residual)	-
Copper (Cu)	≤ 0.25 (residual)	-

International Standard Grades

Country/Region	Standard	Equivalent Grade	Yield Strength (MPa)
Europe (EN)	EN 10025-3/-5	S420	≥420 (≤16mm thickness)
China (GB)	GB/T 1591	Q420	≥420 (≤16mm thickness)
USA (ASTM)	ASTM A572	Grade 65	≥448 (65 ksi)
USA (ASTM)	ASTM A913	Grade 65	≥448 (65 ksi)
Japan (JIS)	JIS G3106	SM490YA/YB	≥390 (≤16mm thickness)
Japan (JIS)	JIS G3136	SN490B	≥390 (≤16mm thickness)
India (IS)	IS 2062	Fe590	≥410
ISO	ISO 683-1/13	E420	≥420

Available Sizes

Dimension	Common Range	Extended/Custom Options
Thickness	5 mm – 200 mm	Up to 300 mm
Width	Up to 3.5 m	Custom widths (e.g., 4 m)
Length	Up to 3.5 m	Custom lengths (e.g., 12 m)

Advantages

Advantages	Description
High Strength	Yield strength ≥420MPa, strong structural load-bearing capacity, reduces weight and costs
Easy to Process	Good weldability and formability, suitable for complex structure fabrication
Excellent Corrosion Resistance	Alloy composition enhances atmospheric corrosion resistance, reducing outdoor maintenance costs
Superior Toughness	Some grades have strong low-temperature impact resistance, suitable for cold environments
Cost-Effective	Less material usage for the same strength, long service life, low lifecycle costs
Wide Applications	Used in construction, machinery, shipbuilding, energy, etc., compliant with international standards

Applications

Industry/Field	Specific Applications
Construction	- High-rise building frames (columns, beams) - Large-span stadiums/airport terminals - Industrial workshop crane beams
Bridge Engineering	- Main girders of highway/railway bridges - Steel box girders - Coastal bridge structures
Heavy Machinery	- Excavator booms, loader frames - Crane steel structures - Agricultural machinery chassis
Energy & Chemicals	- Power plant boiler supports - Chemical storage tank frameworks - Nuclear power station foundations
Marine Engineering	- Offshore oil platform 导管架 (jackets), steel piles - Ship hull keels, deck reinforcements
Transportation	- High-speed rail station canopies - Railway signal towers - Heavy-duty truck frames
Industrial Equipment	- Heavy-duty conveyor systems - Mining machinery components (e.g., track plates) - Pressure vessel supports

FAQ

Q: What is S420 medium plate?

A: S420 is a high-strength structural steel plate under the European standard EN 10025-2, with a minimum yield strength of 420 MPa. It belongs to low-alloy high-strength steel (HSLA), widely used in construction, bridges, machinery, and marine projects.

Q: What's the equivalent standard in China?

A: The Chinese equivalent is Q420 (GB/T 1591), with similar mechanical properties but slightly different chemical compositions.

Q: What are the common thickness ranges?

A: Typically 6 mm to 100 mm, but custom thicknesses (e.g., 4 mm – 120 mm) can be arranged based on orders.

Q: What's the delivery time for a 20ft container?

A: Usually 15–25 days after order confirmation, depending on stock availability and customization requirements.

Q: Can you supply samples?

A: Yes, free samples (within 200 mm × 200 mm) can be provided for quality evaluation. Buyer bears shipping costs.

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