Piastra in acciaio ad alta resistenza a bassa lega Q355B GB/T 1591 Structural Steel Plate
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
YIELD STRENGTH
≥355 MPa
TENSILE STRENGTH
470–630 MPa
IMPACT ENERGY
≥34 J @ −20°C
01 · PANORAMICA DEL PRODOTTO
Q355B is a low-alloy high-strength structural steel to GB/T 1591, micro-alloyed with niobium, vanadio e titanio. 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
One material, one grade — Q355B only. Micro-alloyed chemistry, guaranteed 355 Resa MPa, certified impact toughness and full traceability via mill certificate.
02 · CARATTERISTICHE PRINCIPALI
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.
Nota: 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.
04 · PROPRIETÀ MECCANICHE (Plate Thickness ≤ 16 mm)
Proprietà
Valore
Test Method
Forza di snervamento (ReH)
≥ 355 MPa
GB/T 228.1
Resistenza alla trazione (Rm)
470 – 630 MPa
GB/T 228.1
Allungamento (UN)
≥ 22 %
GB/T 228.1
Charpy Impact (Grade B, −20 °C)
≥ 34 J
GB/T 229
Bend Test (180°)
No cracking, d = 2t
GB/T 232
YIELD STRENGTH — COMMON GRADES COMPARISON
Q235B (≥235 MPa)BASE
Q355B (≥355 MPa)+51%
Q460C (≥460 MPa)HIGHER
05 · PROPRIETÀ FISICHE
DENSITY
7.85 g/cm³
MELTING POINT
≈ 1510 ° C.
MODULUS OF ELASTICITY
200 – 210 GPa
THERMAL EXPANSION
≈ 12×10⁻⁶ /K
06 · SPECIFICHE COMUNI
Spessore (mm)
Larghezza (mm)
Lunghezza (mm)
Typical Weight
6
1500 / 2000 / 2200 / 2500
6000 / 9000 / 12000
47.1 kg/mq
8
1500 / 2000 / 2200 / 2500
6000 / 9000 / 12000
62.8 kg/mq
10
1500 / 2000 / 2200 / 2500
6000 / 9000 / 12000
78.5 kg/mq
12
1500 / 2000 / 2200 / 2500
6000 / 9000 / 12000
94.2 kg/mq
16
2000 / 2200 / 2500
6000 / 9000 / 12000
125.6 kg/mq
20 – 100
1500 – 3000
6000 – 12000
157 – 785 kg/mq
Superficie
Laminato a caldo, mill scale surface; shot-blasted & primed, or oiled, available on request
Custom width, lunghezza, edge preparation and profiling available — specify your requirement in the inquiry.
07 · APPLICAZIONI
Steel bridges & gantry structures
Building frames & high-rise columns
Engineering machinery & gru
Costruzione navale & marine structures
Recipienti a pressione & serbatoi di stoccaggio
Wind power towers & heavy equipment
08 · LAVORAZIONE & CONFEZIONE
Flame / plasma cutting, granigliatura, edge milling and painting available. Plates packed on steel or wooden pallets, steel-banded and protected for ocean shipment.
DELIVERY
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, larghezza, length and quantity — we will confirm stock, prezzo e consegna entro 24 ore.
PROGRESSO
