Description

Technical Parameters

The Q390 carbon steel wire achieves a balance in the triangle of high strength, weldability and low-temperature toughness. It is a cost-effective choice for the heavy engineering field, and is particularly suitable for meeting the upgrading needs that replace the traditional Q345.

Product Advantages:
✔ High Tensile Strength
✔ Superior Impact Toughness
✔ Good Corrosion Resistance
✔ Precision Manufacturing

Product Applications:

Structural components

Welding wires

Fencing & mesh

Industrial fasteners

Product Specifications:

Product	Q390 Carbon Steel wire
Material	Q390
Standard	ASME, ASTM, EN, BS, GB, DIN, JIS, etc
Size Range	0.1mm-14mm, or as per requirements
Surface Treatment	Common, polished, galvanized, black, etc.
Processing Service	Welding, Punching, Cutting, Bending, Decoiling
Delivery Time	According to customer needs
Shape	Round.Rectangle
MOQ	1 Ton
Application	Railing posts, trusses, scaffolding, etc.
Package	Standard Seaworthy Package

Mechanical Properties:

Grade	tensile strength(Mpa)	Yield Strength(Mpa)	Elongation(%)	Hardness(HBV)
Q390	490-650	≥390	≥20	≤220

Chemical Compositions:

Grade	C(%)	Si(%)	Mn(%)	V(%)	Nb(%)	Ti(%)	Ni(%)	N(%)
Q390	≤0.20	≤0.55	1.00-1.60	0.02-0.15	0015-0.060	≤0.20

Material Basic Attributes:

1. Specifications and Standards

Chinese Standard: GB/T 1591-2018 (Low Alloy High Strength Structural Steel)

Specification Interpretation:

Q: Yield Strength ("Yield" is the initial letter of the pinyin)

390: Minimum Yield Strength ≥ 390 MPa (Thickness ≤ 16mm)

International benchmarking:

United States ASTM: A572 Gr.50 (similar performance)

European EN: S355JR (with slightly lower strength)

2. Quality Grades:

It is divided into five levels: A, B, C, D, and E. The differences lie in impact toughness and impurity control:

Grade	Sulfur (S)	Phosphorus (P)	Impact Temperature	Applicable Scenarios
A grade	≤0.045%	≤0.045%	No requirements	Normal temperature static structure
B grade	≤0.040%	≤0.040%	20℃ impact	General dynamic load (such as construction machinery)
C grade	≤0.035%	≤0.035%	0°C impact	Low-temperature, light-load structure
D grade	≤0.030%	≤0.025%	-20℃ impact	Bridges/Buildings in extremely cold regions
E grade	≤0.025%	≤0.020%	-40℃ impact	Polar engineering, LNG storage tanks