Higher yield than Q235 with micro-alloyed toughness — the weight-saving choice for bridges, buildings, machines and heavy structures.
標準: ギガバイト/トン 1591GRADE: Q355BTHICKNESS 2–100 mm
降伏強度
≥355 MPa
抗張力
470–630MPa
IMPACT ENERGY
≥34 J @ −20°C
01 ・製品概要
Q355B is a low-alloy high-strength structural steel to GB/T 1591, micro-alloyed with niobium, バナジウムとチタン. 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
一つの素材, one grade — Q355B only. Micro-alloyed chemistry, guaranteed 355 MPa収量, certified impact toughness and full traceability via mill certificate.
02 · 主な機能
High Yield Strength
≥355 MPa yield enables thinner, lighter sections — up to ~30 % weight saving versus Q235 designs.
優れた溶接性
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.
03 ・化学組成 (鋳造分析, %) — Q355B (ギガバイト/トン 1591)
要素
C
と
ん
P
S
注意
V
の
マックス / 範囲
0.24
0.55
1.60
0.035
0.035
0.015–0.060
0.020–0.120
0.020–0.100
注記: 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 · 機械的特性 (Plate Thickness ≤ 16 んん)
財産
価値
試験方法
降伏強さ (ReH)
≥ 355 MPa
ギガバイト/トン 228.1
抗張力 (RM)
470 – 630 MPa
ギガバイト/トン 228.1
伸長 (あ)
≥ 22 %
ギガバイト/トン 228.1
シャルピーインパクト (Grade B, −20 °C)
≥ 34 J
ギガバイト/トン 229
曲げ試験 (180°)
ひび割れなし, d = 2t
ギガバイト/トン 232
YIELD STRENGTH — COMMON GRADES COMPARISON
Q235B (≧235MPa)BASE
Q355B (≥355 MPa)+51%
Q460C (≥460 MPa)より高い
05 · 物理的特性
密度
7.85 g/cm3
融点
≈ 1510 ℃
弾性率
200 – 210 GPa
THERMAL EXPANSION
≈ 12×10⁻⁶ /K
06 ・共通仕様
厚さ (んん)
幅 (んん)
長さ (んん)
Typical Weight
6
1500 / 2000 / 2200 / 2500
6000 / 9000 / 12000
47.1 kg/平方メートル
8
1500 / 2000 / 2200 / 2500
6000 / 9000 / 12000
62.8 kg/平方メートル
10
1500 / 2000 / 2200 / 2500
6000 / 9000 / 12000
78.5 kg/平方メートル
12
1500 / 2000 / 2200 / 2500
6000 / 9000 / 12000
94.2 kg/平方メートル
16
2000 / 2200 / 2500
6000 / 9000 / 12000
125.6 kg/平方メートル
20 – 100
1500 – 3000
6000 – 12000
157 – 785 kg/平方メートル
表面
熱間圧延, mill scale surface; shot-blasted & primed, or oiled, available on request
カスタム幅, 長さ, edge preparation and profiling available — specify your requirement in the inquiry.
07 · アプリケーション
Steel bridges & gantry structures
Building frames & high-rise columns
Engineering machinery & クレーン
造船 & marine structures
圧力容器 & 貯蔵タンク
Wind power towers & heavy equipment
08 · 加工 & 梱包
Flame / プラズマ切断, ショットブラスト, edge milling and painting available. Plates packed on steel or wooden pallets, steel-banded and protected for ocean shipment.
配達
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, 幅, 長さと数量 — 在庫を確認させていただきます, 価格と納期以内 24 時間.
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