Higher yield than Q235 with micro-alloyed toughness — the weight-saving choice for bridges, buildings, machines and heavy structures.
STANDARD: GB/T 1591GRADE: Q355BTHICKNESS 2–100 mm
RÉSISTANCE D'ÉLÉGEMENT
≥355 MPa
RÉSISTANCE À LA TRACTION
470–630 MPa
IMPACT ENERGY
≥34 J @ −20°C
01 · APERÇU DU PRODUIT
Q355B is a low-alloy high-strength structural steel to GB/T 1591, micro-alloyed with niobium, vanadium et titane. It delivers about 50 % higher yield strength than Q235B, allowing lighter sections and reduced welding, while keeping good weldability and excellent low-temperature toughness.
WHY CHOOSE Q355B
Un matériau, one grade — Q355B only. Micro-alloyed chemistry, guaranteed 355 Rendement MPa, certified impact toughness and full traceability via mill certificate.
02 · PRINCIPALES CARACTÉRISTIQUES
High Yield Strength
≥355 MPa yield enables thinner, lighter sections — up to ~30 % weight saving versus Q235 designs.
Excellent Weldability
Low carbon equivalent (CEV) keeps HAZ hardness low — weldable without pre-heat in most shop conditions.
Low-Temperature Toughness
Guaranteed ≥34 J at −20 °C (grade B) for safe service in cold climates and dynamic loading.
Weight Saving
Higher design stress cuts plate thickness and tonnage, reducing material, freight and fabrication cost.
Certified Quality
Mill test certificate with full chemistry and mechanicals supplied for every batch; third-party inspection available.
Cut-to-Size
Plasma and flame cutting to drawing — plates, blanks and profiled parts ready for use.
Note: Micro-alloy elements Nb, V, Ti added singly or in combination per GB/T 1591. Cu ≤ 0.40 %, N ≤ 0.012 %, Al ≥ 0.015 %. Mill test certificate supplied with every batch.
Laminé à chaud, mill scale surface; shot-blasted & primed, or oiled, disponible sur demande
Custom width, longueur, edge preparation and profiling available — specify your requirement in the inquiry.
07 · DEMANDES
Steel bridges & gantry structures
Cadres de construction & high-rise columns
Engineering machinery & grues
Construction navale & marine structures
Appareils à pression & réservoirs de stockage
Wind power towers & matériel lourd
08 · TRAITEMENT & CONDITIONNEMENT
Flame / coupage au plasma, grenaillage, edge milling and painting available. Plates packed on steel or wooden pallets, steel-banded and protected for ocean shipment.
LIVRAISON
Sea freight with full export documentation (CI, PL, CO, MTC, third-party inspection if required) and loading supervision.
Need Q355B plate for your structure?
Tell us thickness, largeur, length and quantity — we will confirm stock, prix et livraison dans 24 heures.
PROGRÈS
