Q355ND STRUCTURAL STEEL
Product Overview
Q355ND 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 D provides guaranteed impact toughness at -20°C. With minimum yield strength of 355MPa, it is widely used in building structures and heavy machinery requiring enhanced reliability in low-temperature conditions.
International Grade Comparison
Europe (EN 10025-3)
S355ND
Impact: -20°C (40J)
Yield: 355MPa
C: ≤0.20%
Si: ≤0.50%
Mn: 0.90-1.65%
P: ≤0.030%
S: ≤0.025%
Nb: ≤0.05%
V: ≤0.12%
Ti: ≤0.05%
Europe (EN 10025-3)
S355N
Impact: -20°C (40J)
Yield: 355MPa
C: ≤0.20%
Si: ≤0.50%
Mn: 0.90-1.65%
P: ≤0.030%
S: ≤0.025%
Nb: ≤0.05%
V: ≤0.12%
Ti: ≤0.05%
USA (ASTM A572)
Gr.50
Impact: Not specified
Yield: 345MPa
C: ≤0.23%
Si: ≤0.40%
Mn: ≤1.35%
P: ≤0.025%
S: ≤0.025%
Nb: ≤0.05%
V: ≤0.15%
Ti: ≤0.05%
China (GB/T 1591)
Q345D
Impact: -20°C (34J)
Yield: 345MPa
C: ≤0.18%
Si: ≤0.50%
Mn: 1.00-1.60%
P: ≤0.030%
S: ≤0.025%
Nb: ≤0.07%
V: ≤0.15%
Ti: ≤0.20%
Grade Comparison: Q355ND vs Q355NE vs Q355NF
Q355ND
Impact: -20°C
KV2 (L): 40J
C: ≤0.20%
P: ≤0.030%
S: ≤0.025%
Q355NE
Impact: -40°C
KV2 (L): 31J
C: ≤0.18%
P: ≤0.025%
S: ≤0.020%
Q355NF
Impact: -60°C
KV2 (L): 27J
C: ≤0.16%
P: ≤0.020%
S: ≤0.010%
Key Advantages
Normalized Condition
Delivered in normalized or normalized plus tempered state for improved grain refinement and consistent mechanical properties.
Controlled Chemistry
Low carbon content and controlled P/S levels ensure excellent weldability and toughness.
-20°C Impact Toughness
Grade D provides guaranteed impact energy of 40J at -20°C (longitudinal), suitable for low-temperature applications.
Applications
Building Structures
High-rise buildings, industrial plants, stadiums, steel frameworks requiring normalized steel for low-temperature service.
Heavy Machinery
Construction machinery, crane booms, mining equipment, heavy vehicles requiring normalized steel for cold environments.
Q355ND Chemical Composition (GB/T 1591-2018)
| Grade | Quality | C | Si | Mn | P | S |
| Q355N | D | ≤0.20 | ≤0.50 | 0.90-1.65 | ≤0.030 | ≤0.025 |
| Nb | V | Ti | Cr | Ni | Cu | Mo | N | Als (min) |
| 0.005-0.05 | 0.01-0.12 | 0.006-0.05 | ≤0.3 | ≤0.5 | ≤0.4 | ≤0.1 | ≤0.015 | ≥0.015 |
Notes:
a. For bars, P/S upper limit +0.005%.
b. V+Nb+Ti ≤0.22%, Mo+Cr ≤0.30%.
c. Ti up to 0.20% maximum.
d. Alt (total aluminum) can substitute Als with minimum 0.020%. When Nb/V/Ti added at specified levels, Als lower limit not required.
e. Steel must contain at least one grain-refining element (Al, Nb, V, Ti) with content not less than specified minimum.
Q355ND Tensile Properties (GB/T 1591-2018)
| Upper yield strength ReH/MPa ≥ | |||||||||
| Grade | ≤16mm | 16-40mm | 40-63mm | 63-80mm | 80-100mm | 100-150mm | 150-200mm | 200-250mm | |
| Q355ND | 355 | 345 | 335 | 325 | 315 | 295 | 285 | 275 | |
| Property | Thickness Range | Value |
| Tensile Strength Rm | ≤100mm | 470-630 MPa |
| 100-200mm | 450-600 MPa | |
| 200-250mm | 450-600 MPa | |
| Elongation A % | ≤16mm | 22% |
| 16-40mm | 22% | |
| 40-63mm | 22% | |
| 63-80mm | 21% | |
| 80-200mm | 21% | |
| 200-250mm | 21% |
| Impact Temperature | 20°C | 0°C | -20°C | -40°C | |
| KV2 (J) ≥ | Longitudinal | 63 | 55 | 47 | 40 |
| 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 | 6 - 80 | 1800 - 2500 | 3000 - 18000 |
| Sheet / Coil | 1.5 - 20 | 900 - 2000 | Coil or cut to length |
Other sizes can be produced upon request. Custom cutting available.
Customizable Options
We offer comprehensive customization services to meet your specific project requirements:
| Custom Dimensions Non-standard sizes, laser cutting |
Surface Treatments Shot blasting, priming |
Edge Preparation Beveling, machining |
| Custom Heat Treatment Normalizing, stress relieving |
Special Testing Third-party inspection |
Custom Marking Special labeling |
Quality & Manufacturing Assurance
Modern Production
Advanced continuous casting and normalized heat treatment for optimal grain refinement
In-process Inspection
Rigorous testing at each stage, including spectral analysis and impact testing at -20°C
Full Documentation
Mill Test Certificate (MTC) compliant with EN 10204 3.1/3.2
Packaging & Logistics
- Packaging: Steel plates bundled with steel straps on wooden skids. Coils wrapped with waterproof paper and steel covers.
- Marking: Each bundle/coil marked with grade, size, heat number, weight.
- Logistics: FOB, CIF, CFR from main Chinese ports. Lead time 25-35 days after order.
Request a Quote
Emails go directly to customize@cehesteel.com — reply within 2h.
Frequently Asked Questions
Q355ND is a normalized low-alloy structural steel per GB/T 1591-2018 with 355MPa min yield and 40J impact at -20°C.
Q355ND is comparable to Q345D (domestic), EN 10025 S355ND, S355N (Europe), and ASTM A572 Grade 50 (USA).
Excellent weldability due to low carbon content and fine-grain normalized structure.
3mm to 250mm plates, 1.5-20mm coils/sheets with custom cutting available.
Yes, EN 10204 3.1 MTC with full data including -20°C impact test results.
Standard 5 tons. Sample orders possible.
Q355ND is widely used in building structures and heavy machinery requiring normalized steel for low-temperature service.