Views: 3085 Author: Site Editor Publish Time: 2026-06-05 Origin: Site
(Post for Website | Recently many buyers inquire about 355 yield steel; below is grade comparison, property & application for purchasing reference)
Grade | Impact Test Temp | Key Features | Working Environment & Typical Industries |
|---|---|---|---|
Q355A | No impact test | Lowest cost, no low-temperature toughness | Indoor steel frame, ordinary support, factory column; not for outdoor cold environment |
Q355B | +20℃ | Best cost-performance, most common stock grade | General factory building, auxiliary machinery parts, container base, infrastructure in Vietnam & Indonesia |
Q355C | 0℃ | Better toughness against mild cold | Open-air steel structure, outdoor engineering machinery components, northern construction projects |
Q355D | -20℃ | Excellent low-temperature toughness | Heavy machinery & mining equipment for cold regions, truck chassis |
Q355E | -40℃ | Super anti-brittle performance for extreme cold | Extra-cold area equipment, pressure vessel accessories, heavy-duty structural parts |
M (TMCP Controlled Rolling): Q355MB/MC/MD/ME
Fine grain, stable toughness for thick plate, superior weldability. Widely used for thick chassis, heavy mechanical parts & laser cutting components, popular for Southeast Asia export.
N (Normalized): Q355NB/NC/ND/NE
Uniform internal structure, low residual stress, less deformation after bending & machining. Suitable for precision processing & complex welded parts.
Z-direction anti-tear: Q355B-Z15/Z25/Z35
Resist lamellar tearing under heavy welding; for high-rise building bearing steel, boiler support, thick welded flange & pressure vessel accessories.
Q355NH Weathering Steel
Anti-atmospheric corrosion, reduces surface painting cost; outdoor tower, open-air silo, wind power bracket.
Q355R Vessel Plate
Special certified steel for pressure equipment; gas tank, normal-pressure boiler, chemical storage container.
Legacy grade Q345A/B/C/D/E = old 16Mn, fully replaced by Q355 with equivalent mechanical property.
All low-alloy high-strength structural steel with gradually increased yield strength above Q355, lighter deadweight under same load:
Q390 & Q420: Medium-load machinery, dump truck sub-frame, small lifting equipment (replace thicker Q355 to reduce weight)
Q460 & Q500: Heavy excavator structure, mining vehicle frame, large crane main beam
Q550 & Q690: Ultra-high strength for heavy mining truck & core load-bearing parts of engineering machinery; we keep Q690D in stock with custom laser cutting service.
S355JR (+20℃ impact) ≈ Q355B: General factory & steel construction for Southeast Asia foreign-funded projects
S355J0 (0℃ impact) ≈ Q355C: Outdoor equipment & European open-air construction
S355J2 (-20℃ impact) ≈ Q355D
S355NL (Normalized -20℃) ≈ Q355ND: EU low-temperature equipment & pressure vessel structure
ASTM: A572Gr50, A992 (YS≈345MPa, equivalent to Q355B): North America construction & factory steel structure
JIS: SM490A/B/C: Japanese-funded factory projects in Vietnam & Indonesia, Japanese standard machinery parts
Full-range Q355, S355 & Q690 steel plates in stock. Custom laser cutting & fixed-size processing available. Regular bulk export to Vietnam, Indonesia and other Southeast Asian nations with official mill test certificate.
