Q390NE STRUCTURAL STEEL
Product Overview
Q390NE is a Chinese grade low-alloy high-strength structural steel conforming to GB/T 1591-2018 standard. It features a normalized or normalized plus tempered delivery condition, offering improved toughness and consistent properties. Grade E provides guaranteed impact toughness at -40°C. With minimum yield strength of 390MPa, it provides higher strength than Q355 series and is widely used in bridges, buildings, pressure vessels, and engineering structures requiring enhanced load-bearing capacity in extreme low-temperature conditions.
International Grade Comparison
Europe (EN 10025-3)
S355NL
Impact: -40°C (40J)
Yield: 355MPa
C: ≤0.18%
Si: ≤0.50%
Mn: 0.90-1.65%
P: ≤0.025%
S: ≤0.020%
China (GB/T 1591)
Q390NE
Impact: -40°C (31J)
Yield: 390MPa
C: ≤0.20%
Si: ≤0.50%
Mn: 0.90-1.70%
P: ≤0.025%
S: ≤0.020%
USA (ASTM A572)
Gr.55
Impact: Not specified
Yield: 380MPa
C: ≤0.23%
Si: ≤0.40%
Mn: ≤1.35%
P: ≤0.030%
S: ≤0.030%
China Grade Comparison: Q355NE vs Q390NE vs Q420NE
Q355NE
Yield: 355MPa
Impact -40°C: 31J
Q390NE
Yield: 390MPa
Impact -40°C: 31J
Q420NE
Yield: 420MPa
Impact -40°C: 31J
Key Advantages
Higher Strength
Min yield 390MPa (≤16mm), tensile 490-650MPa.
Normalized Condition
Delivered normalized/N+T for refined grain.
-40°C Impact Toughness
Guaranteed 31J at -40°C (longitudinal).
Applications
Building Structures
Arctic region buildings, stadiums, cold-climate frameworks.
Heavy Machinery
Extreme cold equipment, offshore platforms, mining machinery.
Q390NE Chemical Composition (GB/T 1591-2018)
| Grade | Quality | C | Si | Mn | P | S |
| Q390N | E | ≤0.20 | ≤0.50 | 0.90-1.70 | ≤0.025 | ≤0.020 |
| Nb | V | Ti | Cr | Ni | Cu | Mo | N | Als (min) |
| 0.01-0.05 | 0.01-0.20 | 0.006-0.05 | ≤0.3 | ≤0.5 | ≤0.4 | ≤0.1 | ≤0.015 | ≥0.015 |
Notes: V+Nb+Ti ≤0.22%, Mo+Cr ≤0.30%. Steel must contain at least one grain-refining element (Al, Nb, V, Ti).
Q390NE Tensile Properties
| Upper yield strength ReH/MPa ≥ | ||||||||
| Grade | ≤16mm | 16-40mm | 40-63mm | 63-80mm | 80-100mm | 100-150mm | 150-200mm | 200-250mm |
| Q390NE | 390 | 380 | 360 | 340 | 340 | 320 | 310 | 300 |
| Property | Thickness Range | Value | Impact Energy (-40°C) |
| Tensile Strength Rm | ≤100mm | 490-650 MPa | 31J (Longitudinal) 27J (Transverse) |
| 100-200mm | 470-620 MPa | ||
| 200-250mm | 470-620 MPa | ||
| Elongation A% | ≤16mm | 20% | |
| 16-40mm | 20% | ||
| 40-63mm | 20% | ||
| 63-80mm | 19% | ||
| 80-200mm | 19% | ||
| 200-250mm | 19% |
| Impact Temperature | 20°C | 0°C | -20°C | -40°C | |
| KV2 (J) ≥ | Longitudinal | 63 | 55 | 47 | 31 |
| Transverse | 40 | 34 | 27 | 20 | |
Notes: Normalized condition includes normalized and tempered condition. When yield not obvious, use Rp0.2.
Size & Specification
| Product Form | Thickness (mm) | Width (mm) | Length (mm) |
| Plate | 3 - 250 | 1000 - 4000 | 3000 - 18000 |
| Sheet / Coil | 1.5 - 20 | 900 - 2000 | Coil or cut to length |
Other sizes available upon request. Custom cutting available.
Customizable Options
We offer comprehensive customization services to meet your specific project requirements:
Non-standard sizes, laser cutting
Shot blasting, priming
Beveling, machining
Normalizing, stress relieving
Third-party inspection
Special labeling
Quality & Manufacturing Assurance
Modern Production
Normalized heat treatment for grain refinement.
In-process Inspection
Spectral analysis & -40°C impact testing.
MTC 3.1/3.2
Full documentation & traceability.
Packaging & Logistics
- Bundled plates with steel straps on wooden skids / coils wrapped waterproof.
- Marking: grade, size, heat number, weight.
- FOB, CIF, CFR from main Chinese ports. Lead time 25-35 days.
Request a Quote
Emails go directly to customize@cehesteel.com — reply within 2h.
Frequently Asked Questions
Normalized low-alloy steel, yield ≥390MPa, -40°C impact 31J per GB/T 1591-2018.
Same chemical composition. NE is normalized with higher impact energy (31J), E is as-rolled (27J).
Nb 0.01-0.05%, V 0.01-0.20%, Ti 0.006-0.05%, Als ≥0.015%.