碳鋼T型(xing)三(san)通(tong)(tong)也是管(guan)(guan)件之一，有兩種。異徑(jing)碳鋼T型(xing)三(san)通(tong)(tong)，兩端(duan)具有相同的(de)直徑(jing)，支(zhi)管(guan)(guan)和其他兩個不(bu)同的(de)直徑(jing)稱為(wei)還(huan)原碳鋼T型(xing)三(san)通(tong)(tong)。碳鋼T型(xing)三(san)通(tong)(tong)管(guan)(guan)、管(guan)(guan)連接件。也稱為(wei)管(guan)(guan)-管(guan)(guan)碳鋼T型(xing)三(san)通(tong)(tong)或(huo)碳鋼T型(xing)三(san)通(tong)(tong)管(guan)(guan)、不(bu)銹鋼等(deng)徑(jing)碳鋼三(san)通(tong)(tong)、碳鋼T型(xing)三(san)通(tong)(tong)接頭，用于(yu)主管(guan)(guan)支(zhi)管(guan)(guan)。

碳(tan)鋼T型(xing)三通(tong)有(you)三個(ge)(ge)(ge)嘴(zui)，即一個(ge)(ge)(ge)   、兩(liang)個(ge)(ge)(ge)出口(kou)；或(huo)者兩(liang)個(ge)(ge)(ge)   、一個(ge)(ge)(ge)出口(kou)的一種(zhong)化管部件，有(you)T形和Y形，有(you)等徑管口(kou)，另外，也有(you)不同(tong)直徑的管口(kou)，用于(yu)3條(tiao)相同(tong)或(huo)不同(tong)的管路(lu)的匯集所。碳(tan)鋼T型(xing)三通(tong)的主要作用是(shi)改變流體的方向。

表(biao)示方法如下：對于等徑碳鋼(gang)(gang)T型(xing)三(san)通(tong)(tong)，比如"T3"（3英(ying)(ying)(ying)(ying)(ying)(ying)寸(cun)(cun)(cun)=DN80）碳鋼(gang)(gang)T型(xing)三(san)通(tong)(tong)則表(biao)示外徑是3英(ying)(ying)(ying)(ying)(ying)(ying)寸(cun)(cun)(cun)的等徑碳鋼(gang)(gang)T型(xing)三(san)通(tong)(tong)。對于異(yi)徑碳鋼(gang)(gang)T型(xing)三(san)通(tong)(tong)，比如"T4×4×3.5"（4英(ying)(ying)(ying)(ying)(ying)(ying)寸(cun)(cun)(cun)=DN100,3.5英(ying)(ying)(ying)(ying)(ying)(ying)寸(cun)(cun)(cun)=DN90）表(biao)示同(tong)徑為(wei)(wei)(wei)四英(ying)(ying)(ying)(ying)(ying)(ying)寸(cun)(cun)(cun)異(yi)徑為(wei)(wei)(wei)3.5英(ying)(ying)(ying)(ying)(ying)(ying)寸(cun)(cun)(cun)的異(yi)徑碳鋼(gang)(gang)T型(xing)三(san)通(tong)(tong)。材質一般為(wei)(wei)(wei)10# 20# A3 Q23 20g 20G 16Mn ASTM A234 ASTM A105 ASTM A403等，碳鋼(gang)(gang)T型(xing)三(san)通(tong)(tong)，外徑范圍在2.5″－60″（2.5英(ying)(ying)(ying)(ying)(ying)(ying)寸(cun)(cun)(cun)=DN65,60英(ying)(ying)(ying)(ying)(ying)(ying)寸(cun)(cun)(cun)=DN1500），壁厚(hou)3-60mm，從26″－60″（26英(ying)(ying)(ying)(ying)(ying)(ying)寸(cun)(cun)(cun)=DN650，60英(ying)(ying)(ying)(ying)(ying)(ying)寸(cun)(cun)(cun)=DN1500）為(wei)(wei)(wei)焊接(jie)碳鋼(gang)(gang)T型(xing)三(san)通(tong)(tong)。壁厚(hou)28－60mm。壓力等級為(wei)(wei)(wei)Sch5s、Sch10s、Sch10、Sch20、Sch30、Sch40s、STD、Sch40、Sch60、Sch80s、XS；Sch80、Sch100、Sch120、Sch140、Sch160、XXS。