螺紋及管接頭

 帶螺紋交(jiao)貨的(de)(de)(de)鍍(du)(du)(du)(du)鋅(xin)(xin)(xin)鋼(gang)(gang)管(guan)(guan)，螺紋應(ying)(ying)(ying)(ying)(ying)在(zai)鍍(du)(du)(du)(du)鋅(xin)(xin)(xin)后車制(zhi)。螺紋應(ying)(ying)(ying)(ying)(ying)符(fu)(fu)(fu)合(he)YB 822的(de)(de)(de)規(gui)(gui)(gui)定。鋼(gang)(gang)制(zhi)管(guan)(guan)接頭應(ying)(ying)(ying)(ying)(ying)符(fu)(fu)(fu)合(he)YB 238的(de)(de)(de)規(gui)(gui)(gui)定;可鍛(duan)鑄鐵(tie)管(guan)(guan)接頭應(ying)(ying)(ying)(ying)(ying)符(fu)(fu)(fu)合(he)YB 230的(de)(de)(de)規(gui)(gui)(gui)定。力學(xue)性(xing)能(neng)(neng) 鋼(gang)(gang)管(guan)(guan)鍍(du)(du)(du)(du)鋅(xin)(xin)(xin)前的(de)(de)(de)力學(xue)性(xing)能(neng)(neng)應(ying)(ying)(ying)(ying)(ying)符(fu)(fu)(fu)合(he)GB 3091的(de)(de)(de)規(gui)(gui)(gui)定。、鍍(du)(du)(du)(du)鋅(xin)(xin)(xin)層(ceng)的(de)(de)(de)均(jun)勻(yun)性(xing)鍍(du)(du)(du)(du)鋅(xin)(xin)(xin)鋼(gang)(gang)管(guan)(guan)應(ying)(ying)(ying)(ying)(ying)作(zuo)鍍(du)(du)(du)(du)鋅(xin)(xin)(xin)層(ceng)均(jun)勻(yun)性(xing)的(de)(de)(de)試(shi)(shi)驗(yan)(yan)(yan)。鋼(gang)(gang)管(guan)(guan)試(shi)(shi)樣在(zai)硫酸銅溶液(ye)中連續(xu)浸漬5次不得變紅(鍍(du)(du)(du)(du)銅色(se))。、冷彎(wan)曲試(shi)(shi)驗(yan)(yan)(yan)公稱口徑不大于50mm的(de)(de)(de)鍍(du)(du)(du)(du)鋅(xin)(xin)(xin)鋼(gang)(gang)管(guan)(guan)應(ying)(ying)(ying)(ying)(ying)作(zuo)冷彎(wan)曲試(shi)(shi)驗(yan)(yan)(yan)。彎(wan)曲角度(du)為90°，彎(wan)曲半徑為外徑的(de)(de)(de)8倍。試(shi)(shi)驗(yan)(yan)(yan)時不帶填充物(wu)，試(shi)(shi)樣焊(han)縫處應(ying)(ying)(ying)(ying)(ying)置于彎(wan)曲方向的(de)(de)(de)外側或(huo)上部。試(shi)(shi)驗(yan)(yan)(yan)后，試(shi)(shi)樣上不應(ying)(ying)(ying)(ying)(ying)有裂縫及(ji)鋅(xin)(xin)(xin)層(ceng)剝(bo)落同(tong)象。水(shui)(shui)(shui)壓(ya)試(shi)(shi)驗(yan)(yan)(yan)水(shui)(shui)(shui)壓(ya)試(shi)(shi)驗(yan)(yan)(yan)應(ying)(ying)(ying)(ying)(ying)在(zai)黑管(guan)(guan)進(jin)行，也可用(yong)渦流探傷(shang)代替水(shui)(shui)(shui)壓(ya)試(shi)(shi)驗(yan)(yan)(yan)。試(shi)(shi)驗(yan)(yan)(yan)壓(ya)力或(huo)渦流探傷(shang)對比(bi)試(shi)(shi)樣尺寸應(ying)(ying)(ying)(ying)(ying)符(fu)(fu)(fu)合(he)GB 3092的(de)(de)(de)規(gui)(gui)(gui)定。