CARBON STEEL · LOW ALLOY HIGH STRENGTH PLATE Q355B Low Alloy High Strength Steel PlateGB/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: ГБ/Т 1591 GRADE: Q355B THICKNESS 2–100 mm YIELD STRENGTH≥355 MPa TENSILE STRENGTH470–630 MPa IMPACT ENERGY≥34 J @ −20°C 01 · PRODUCT OVERVIEW Q355B is a low-alloy high-strength structural steel to GB/T 1591, micro-alloyed with niobium, ванадий и титан. 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 Выход МПа, certified impact toughness and…
Higher yield than Q235 with micro-alloyed toughness — the weight-saving choice for bridges, buildings, machines and heavy structures.
STANDARD: ГБ/Т 1591GRADE: Q355BTHICKNESS 2–100 mm
YIELD STRENGTH
≥355 MPa
TENSILE STRENGTH
470–630 MPa
IMPACT ENERGY
≥34 J @ −20°C
01 · PRODUCT OVERVIEW
Q355B is a low-alloy high-strength structural steel to GB/T 1591, micro-alloyed with niobium, ванадий и титан. 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 Выход МПа, certified impact toughness and full traceability via mill certificate.
02 · KEY FEATURES
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.
Горячекатаный, mill scale surface; shot-blasted & primed, or oiled, available on request
Custom width, длина, edge preparation and profiling available — specify your requirement in the inquiry.
07 · APPLICATIONS
Steel bridges & gantry structures
Building frames & high-rise columns
Engineering machinery & краны
Судостроение & marine structures
Pressure vessels & резервуары для хранения
Wind power towers & тяжелое оборудование
08 · PROCESSING & PACKAGING
Flame / plasma cutting, дробеструйная обработка, 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, МТС, third-party inspection if required) and loading supervision.
Need Q355B plate for your structure?
Tell us thickness, ширина, length and quantity — we will confirm stock, цена и доставка в пределах 24 часы.
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