Q355鋼是中國低合金高強度結構鋼，取代 Q345, the material density is 7.85 g/cm3. According to GB/T 1591 -2018, Q355 has 3 quality levels: Q355B, Q355C and Q355D. “Q” is the first letter of Chinese Pinyin: “qu fu dian”, which means Yield Strength, “355” is the minimum value of yield strength 355 MPa for steel thickness ≤16mm, and tensile strength is 470-630 Mpa.
下表顯示了 Q355 材料數據表和規格，例如化學成分和機械性能。
| Steel Grade | Quality Grade | C % (≤) | Si % (≤) | Mn (≤) | P (≤) | S (≤) | Cr (≤) | Ni (≤) | Cu (≤) | N (≤) |
| Q355 | Q355B | 0.24 | 0.55 | 1.6 | 0.035 | 0.035 | 0.30 | 0.30 | 0.40 | 0.012 |
| Q355C | 0.20 | 0.030 | 0.030 | 0.012 | ||||||
| Q355D | 0.20 | 0.025 | 0.025 | – |
根據冶煉分析，鋼材以熱軋狀態交貨。
| CEV (Mass fraction ≤%); Nominal thickness or diameter (d) | ||||||
| Steel Grade | Quality Grade | ≤ 30 | 30 < d ≤ 63 | 63 < d ≤ 150 | 150 < d ≤ 250 | 250 < d ≤ 400 |
| Q355 | Q355B | 0.45 (CEV) | 0.47 | 0.47 | 0.49 | – |
| Q355C | – | |||||
| Q355D | 0.49 | |||||
筆記：
| Yield Strength (≥N/mm2), Thickness or Dia. (d) in mm | ||||||||||
| Steel Grade | Quality Level | d≤16 | 16< d ≤40 | 40 < d ≤63 | 63 < d ≤ 80 | 80< d ≤ 100 | 100< d≤ 150 | 150 < d≤ 200 | 200 < d ≤ 250 | 250 < d ≤ 400 |
| Q355 | Q355B | 355 | 345 | 335 | 325 | 315 | 295 | 285 | 275 | – |
| Q355C | – | |||||||||
| Q355D | 265 | |||||||||
| Tensile Strength (N/mm2), Dia. (d) mm | |||||
| Steel Grade | Quality Level | d≤100 | 100 < d ≤ 150 | 150 < d ≤ 250 | 250 < d ≤ 400 |
| Q355 | Q355B | 470 – 630 | 450 – 600 | 450 – 600 | – |
| Q355C | – | ||||
| Q355D | 450 – 600 | ||||
| Dia. (d) mm; Elongation (%) | ||||||
| Sample direction | d≤40 | 40 < d ≤ 63 | 63 < d ≤ 100 | 100 < d ≤ 150 | 150 < d≤ 200 | 250 < d ≤ 400 |
| Horizontal | 20 | 19 | 18 | 18 | 17 | 17 |
| Vertical | 22 | 21 | 20 | 18 | 17 | 17 |
夏比（V 型缺口）衝擊試驗溫度和衝擊吸收功（KV2/J）。
| Quality | Temperature | Longitudinal Impact Energy (J), ≥ | Transverse Impact Energy (J), ≥ |
| Q355B | 20 ℃ | 34 | 27 |
| Q355C | 0 ℃ | 34 | 27 |
| Q355D | -20 ℃ | 34 (for thickness ≥250mm) | 27 (for thickness ≥250mm) |
Q355鋼具有良好的機械性能、良好的焊接性、冷熱加工性能和耐腐蝕性能。可用於製造船舶、鍋爐、壓力容器、石油儲罐、橋樑、電站設備、起重運輸機械等更高載荷的焊接結構件。
Q355 carbon steel equivalent to European EN (German DIN EN, British BSI, French NF…) and ISO standard.
| China | ISO | European Union | |||
| Standard | Grade | Standard | Grade | Standard | Grade (Material Number) |
| GB/T 1591 -2018 | Q355B | ISO 630-2 | S355B | EN 10025-2 | S355、S355JR (1.0045) |
| Q355C | S355C | S355J0 (1.0553) | |||
| Q355D | S355D | S355J2 (1.0577) | |||
Copyright © 2022 友聯建設集團|友聯鋼結構材料有限公司 版權所有。 網站地圖 技術支援 
