Q355NE (equivalent to EN 10025 S355NL) is a low-alloy, high-strength structural steel designed for welded structures and engineering components subjected to low-temperature service.
With excellent toughness, strength, and weldability, this steel grade performs reliably in demanding environments such as bridges, offshore structures, pressure vessels, heavy machinery, and steel frameworks.
Q355NE / S355NL belongs to the normalized or normalized rolled fine-grain structural steel family. It combines controlled carbon content, microalloying, and refined grain size, providing both high yield strength and excellent impact resistance down to –50°C.
Chemical Composition (Typical, %)
C ≤ 0.18
Si ≤ 0.55
Mn: 1.00–1.60
P ≤ 0.025
S ≤ 0.020
Nb, V, Ti (microalloying): ≤ 0.12
Strict control of phosphorus and sulfur ensures superior notch toughness and weld seam integrity, even in thick-section plates.
Mechanical Properties
| Property | Q355NE / S355NL (Typical Values) |
| Yield Strength (MPa) | ≥ 355 (for ≤16mm thickness) |
| Tensile Strength (MPa) | 490–630 |
| Elongation (%) | ≥ 20 |
| Charpy Impact (–50°C) | ≥ 27 J |
These characteristics make Q355NE a dependable choice for structures requiring high strength-to-weight ratio, good cold resilience, and reliable weld performance.
Key Features and Advantages
High yield-to-weight ratio suitable for optimized steel designs
Excellent impact toughness at sub-zero temperatures
Superior weldability, with low carbon equivalent (CE ≤ 0.45%)
Fine-grain microstructure from controlled rolling and normalization
Stable mechanical performance across thickness ranges
Common Applications
Q355NE / S355NL structural steel is widely used in engineering and construction sectors where both high strength and good ductility are required:
Steel bridges and offshore platforms
Heavy machinery frames and lifting equipment
Pressure vessels and storage tanks
Cranes, truck chassis, and mechanical components
Building frameworks and energy projects
Equivalent Grades:
EN 10025-3: S355NL
GB/T 1591: Q355NE
JIS G3106: SM490YA / YB (approx.)
Quality Supply from ChinaSpecSteel
ChinaSpecSteel supplies Q355NE / S355NL high-strength low-alloy structural steel sourced from Jiyuan Iron & Steel Group, one of China’s leading integrated special steel producers.
Jiyuan operates a long-process production route—from ironmaking to steelmaking, rolling, and testing—ensuring consistent material quality, excellent mechanical stability, and traceable origin for every batch.
Available Forms:
Hot-rolled plates and coils
Forged and normalized bars
Structural sections and pre-cut blanks
Custom thickness and dimensional tolerances available
Processing & Testing Capabilities:
Normalizing and heat treatment
Ultrasonic flaw detection and Charpy impact testing
Mechanical and chemical composition analysis
Third-party inspection (SGS, BV, TÜV) on request
Manufacturing Advantage — Jiyuan Iron & Steel
Jiyuan Iron & Steel is equipped with advanced steelmaking, refining, and rolling facilities, meeting international standards for special and alloy steels.
Its products are widely used in engineering machinery, shipbuilding, pressure vessels, and energy equipment industries.
The production base covers a wide range of high-quality steels:
Bearing steel, spring steel, cold heading steel, gear steel
Alloy structural steel, carbon structural steel, high-strength wear-resistant steel
Tube billet steel, anchor chain steel, and continuous cast iron profiles
Deep-processed products such as precision wire, heat-treated bar, bright bar, and fasteners
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