Q355是(shi)(shi)一(yi)種(zhong)(zhong)鋼(gang)材(cai)(cai)(cai)。是(shi)(shi)一(yi)種(zhong)(zhong)低(di)合(he)金高(gao)強度(du)結構鋼(gang)，廣泛(fan)應(ying)(ying)用(yong)于橋梁(liang)(liang)、車輛、船舶、建筑(zhu)、壓(ya)力容器(qi)(qi)、特(te)種(zhong)(zhong)設備等，其(qi)中“Q”意為(wei)屈(qu)服(fu)強度(du)，355表示這種(zhong)(zhong)鋼(gang)材(cai)(cai)(cai)屈(qu)服(fu)強度(du)為(wei)355MPa，并會(hui)隨(sui)(sui)著材(cai)(cai)(cai)質(zhi)(zhi)的(de)(de)(de)(de)厚度(du)的(de)(de)(de)(de)增(zeng)加(jia)而使(shi)(shi)其(qi)屈(qu)服(fu)值(zhi)減(jian)小。 Q355是(shi)(shi)一(yi)種(zhong)(zhong)鋼(gang)材(cai)(cai)(cai)的(de)(de)(de)(de)材(cai)(cai)(cai)質(zhi)(zhi)。它是(shi)(shi)碳素合(he)金鋼(gang)(c<0.2%)，綜合(he)性(xing)能(neng)(neng)(neng)好，低(di)溫性(xing)能(neng)(neng)(neng)好，冷沖壓(ya)性(xing)能(neng)(neng)(neng)，焊接性(xing)能(neng)(neng)(neng)和(he)可切(qie)削(xue)性(xing)能(neng)(neng)(neng)好。廣泛(fan)應(ying)(ying)用(yong)于橋梁(liang)(liang)、車輛、船舶、建筑(zhu)、壓(ya)力容器(qi)(qi)等。Q代表的(de)(de)(de)(de)是(shi)(shi)這種(zhong)(zhong)材(cai)(cai)(cai)質(zhi)(zhi)的(de)(de)(de)(de)屈(qu)服(fu)，后面的(de)(de)(de)(de)345，就是(shi)(shi)指這種(zhong)(zhong)材(cai)(cai)(cai)質(zhi)(zhi)的(de)(de)(de)(de)屈(qu)服(fu)值(zhi)，在345MPa左(zuo)右。并會(hui)隨(sui)(sui)著材(cai)(cai)(cai)質(zhi)(zhi)的(de)(de)(de)(de)厚度(du)的(de)(de)(de)(de)增(zeng)加(jia)而使(shi)(shi)其(qi)屈(qu)服(fu)值(zhi)減(jian)小。