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牌號
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S355JR低合金結構鋼熱軋鋼板
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中國ISC
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L03452
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對應標準
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GB /T 3274-2017
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碳素結構鋼和低合金結構鋼熱軋鋼板和鋼帶
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Hot-rolled plates, sheets and strips of carbon structural steels and high strength low alloy structural sheets
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品牌/供貨源
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中國大陸-> 寶鋼
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歸類
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合金鋼
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性能
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低溫韌性 鍛壓性 易切削性 焊接性
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標簽
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熱軋鋼板和鋼帶 低合金結構鋼
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說明
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性能特點：
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綜合力學性能好，冷熱加工性能、焊接性能和耐蝕性能均好
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用途舉例：
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廣泛應用于橋梁、車輛、船舶、建筑、壓力容器等。
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本標準適用于厚度不大于400mm的碳素結構鋼和低合金鋼熱軋鋼板和鋼帶
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S355JR化學元素成分含量(%)
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成分
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C
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Si
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Mn
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P
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S
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Cr
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Ni
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Cu
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Mo
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N
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Ti
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V
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Nb
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最小值
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-
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-
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-
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-
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-
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-
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-
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-
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-
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-
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-
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-
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-
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最大值
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0.2
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0.5
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1.7
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0.035
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0.035
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0.3
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0.5
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0.3
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0.1
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0.012
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0.2
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0.15
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0.07
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鋼的牌號和化學成分(熔煉分析)應符合GB/T 700和GB/T 1591的規(guī)定。
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S355JR機械性能
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厚度（直徑、邊長）
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抗拉強度
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屈服點
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斷后伸長率或延伸率
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t
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σb
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σs
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δ
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mm
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Mpa
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Mpa
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%
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t≤16
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470~630
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≥345
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≥20
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16< t≤ 40
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470~630
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≥335
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≥20
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40＜t≤63
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470~630
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≥325
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≥19
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63＜t≤80
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470~630
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≥315
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≥19
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80＜t≤100
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470~630
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≥305
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≥19
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100＜t≤150
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450~600
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≥285
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≥18
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150＜t≤200
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450~600
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≥275
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≥17
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200＜t≤250
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450~600
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≥265
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≥17
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1、力學性能：
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①厚度小于3mm的鋼板和鋼帶的抗拉強度和斷后伸長率應符合GB/T 700、GB/T 1591的規(guī)定，斷后伸長率允許比GB/T 700或GB/T 1591的規(guī)定降低5%(絕對值)。根據需方要求，鋼板和鋼帶的屈服強度可按GB/T 700、GB/T 1591的規(guī)定。
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②厚度不小于3mm的鋼板和鋼帶的力學和工藝性能應符合GB/T 700、GB/T 1591的規(guī)定。
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2、工藝性能：
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鋼板和鋼帶應做180°彎曲試驗，試樣彎曲壓頭直徑應符合GB/T 700、GB/T 1591的規(guī)定。如供方能保證冷彎試驗合格，可不作檢驗。
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