Name: Q390 / Q420 Carbon Steel Plate
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Q390 / Q420 Carbon Steel Plate

Q390 and Q420 high-strength low-alloy plates deliver 390MPa / 420MPa yield strength, outperforming Q355 for ultra-heavy load scenarios. With stable low-temperature toughness and outstanding fatigue resistance, they serve core structural raw materials for mining machinery, lifting equipment, large factory frames, tower cranes and heavy container girders for global heavy industrial procurement.

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Types of carbon steel and their properties

Carbon steel can be classified into three categories according to its carbon content: low-carbon steel (or mild-carbon steel), medium-carbon steel and high-carbon steel . Their carbon content, microstructure and properties compare as follows:

Carbon content (wt.%)	Microstructure	Properties	Examples
Low-carbon steel	< 0.25	Ferrite, pearlite	Low hardness and cost. High ductility, toughness, machinability and weldability
Medium-carbon steel	0.25 – 0.60	Martensite	Low hardenability, medium strength, ductility and toughness
High-carbon steel	0.60 – 1.25	Pearlite	High hardness, strength, low ductility

PRODUCT DETAILS

Product Name	Q390 / Q420 Carbon Steel Plate
Standard	GB/T 1591; Equivalent: ASTM A572 Gr55 (Q390), A572 Gr60 (Q420), EN S420NL
Material	Q390 / Q420
Technique	Cold Rolled, Hot Rolled
Common Sizes & Thickness	Thickness range: 6mm–120mm Standard width: 1000/1250/1500mm; length: 6000/12000mm Hot selling gauges: 16mm, 25mm, 30mm, 40mm, 50mm
Surface Treatment	Hot rolled black oxide finish, pickled & oiled, shot blasted anti-rust primer, anti-rust oil sealed for long ocean export shipment.
Temper	Hot rolled as standard; normalized temper available for Q390D/Q420D low-temperature orders.
Origin	China
HS Code	7209250000
Delivery Time	7-15 days，depends on quantity ordered
After-sales Service	24 hours online
Production Capacity	100000 Tons/Year
Loading Port	Any port in China
Certificates	ISO9001, SGS, RoHS, EN10204 3.1 Mill Test Certificate
Packaging	Standard Sea-worthy Packaging
Processing Service	Bending, Welding, Decoiling, Punching, Cutting
Tolerance	±1%
MOQ	5 tons
Payment Terms	TT, LC,Cash, Paypal, DP, DA,Western Union or Others.
Terms Of Trade	EXW,FOB, CRF, CIF ,CNF or others
Exported to	Southeast Asia, Middle East, Eastern Europe, Australia
Core Strengths	Higher yield strength than Q355 series, support extreme heavy cyclic loads without deformation Tiered B/C/D grades with progressive low-temperature impact resistance for cold-region projects Excellent weldability and anti-fatigue property for long-service heavy equipment frames Optimized micro-alloy formula balances high strength and competitive raw material cost Flat uniform surface, easy cutting, bending and forming for oversized structural parts
Application	Heavy mining mechanical components, crane & lifting equipment frames, large industrial workshop beams, tower crane load-bearing parts, heavy-duty container girders, thick bridge auxiliary supports, construction heavy machinery bases.

If you are in market for high quality carbon steel sheet metal product, please send inquiry to us now to get free bulk wholesale quote! Haiwo steel group is steel factory in Foshan, China, over 12+ export and manufacturing experience, provide professional service for all customers worldwide.

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