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力(li)(li)(li)學性(xing)能(neng)(neng) 鋼(gang)管(guan)(guan)(guan)鍍(du)鋅(xin)前的(de)力(li)(li)(li)學性(xing)能(neng)(neng)應符合(he)GB 3091的(de)規(gui)定。5、鍍(du)鋅(xin)層(ceng)(ceng)的(de)均勻性(xing)鍍(du)鋅(xin)鋼(gang)管(guan)(guan)(guan)應作(zuo)鍍(du)鋅(xin)層(ceng)(ceng)均勻性(xing)的(de)試(shi)(shi)驗(yan)(yan)(yan)。鋼(gang)管(guan)(guan)(guan)試(shi)(shi)樣(yang)在硫(liu)酸(suan)銅(tong)溶液中連(lian)續(xu)浸(jin)漬(zi)5次不得(de)變紅（鍍(du)銅(tong)色）。6、冷彎(wan)曲(qu)試(shi)(shi)驗(yan)(yan)(yan)公稱口徑不大于50mm的(de)鍍(du)鋅(xin)鋼(gang)管(guan)(guan)(guan)應作(zuo)冷彎(wan)曲(qu)試(shi)(shi)驗(yan)(yan)(yan)。彎(wan)曲(qu)角度(du)(du)為(wei)90°，彎(wan)曲(qu)半(ban)徑為(wei)外徑的(de)8倍。試(shi)(shi)驗(yan)(yan)(yan)時(shi)(shi)不帶填充(chong)物，試(shi)(shi)樣(yang)焊縫處應置(zhi)于彎(wan)曲(qu)方向的(de)外側或(huo)上部。試(shi)(shi)驗(yan)(yan)(yan)后，試(shi)(shi)樣(yang)上不應有裂縫及鋅(xin)層(ceng)(ceng)剝落同(tong)象(xiang)。7、水壓(ya)試(shi)(shi)驗(yan)(yan)(yan)水壓(ya)試(shi)(shi)驗(yan)(yan)(yan)應在黑(hei)管(guan)(guan)(guan)進(jin)行(xing)，也可用(yong)(yong)渦(wo)流(liu)(liu)探傷代替水壓(ya)試(shi)(shi)驗(yan)(yan)(yan)。試(shi)(shi)驗(yan)(yan)(yan)壓(ya)力(li)(li)(li)或(huo)渦(wo)流(liu)(liu)探傷對比試(shi)(shi)樣(yang)尺寸應符合(he)GB 3092的(de)規(gui)定。鋼(gang)材力(li)(li)(li)學性(xing)能(neng)(neng)是保證鋼(gang)材終使(shi)用(yong)(yong)性(xing)能(neng)(neng)（機械性(xing)能(neng)(neng)）的(de)重要(yao)指(zhi)標，力(li)(li)(li)學性(xing)能(neng)(neng)①抗拉強(qiang)度(du)(du)（σb）：試(shi)(shi)樣(yang)在拉伸過程中，在拉斷時(shi)(shi)所承受(shou)的(de)力(li)(li)(li)（Fb），除以試(shi)(shi)樣(yang)原橫截面(mian)積（So）所得(de)的(de)應力(li)(li)(li)（σ），稱為(wei)抗拉強(qiang)度(du)(du)（σb），單位為(wei)N/mm2（MPa）。它表示金屬(shu)材料在拉力(li)(li)(li)作(zuo)用(yong)(yong)下抵抗破(po)壞的(de)能(neng)(neng)力(li)(li)(li)。式中：Fb--試(shi)(shi)樣(yang)拉斷時(shi)(shi)所承受(shou)的(de)力(li)(li)(li)，N（牛頓）； So--試(shi)(shi)樣(yang)原始橫截面(mian)積，mm2。