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17:33:00</p><p><span id="click" >瀏覽次數(shù)：8次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="ft77dxh" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">新疆博金元貿(mào)易有限公司</a></p><p><span>聯(lián)系人：</span>資文豪</p><p><span>郵箱: </span>1640613323@qq.com</p><p><span>電話: </span>13095180154</p><p><span>傳真: </span>0991_3877167</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>0991-3877167</p><p><span>地址: </span>新疆烏魯木齊經(jīng)濟開發(fā)區(qū)（頭屯河區(qū)）鐵金街118號北方鋼鐵物流園7區(qū)16棟3號</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="fz7f9zz" class="page-proshow02"><p class="title">詳細說明</p><div id="hjpx9tb" class="box"><p><p> 采用漢語拼音字母、化學元素符號和阿拉伯數(shù)字相結(jié)合的方法表示。①鋼號中化學元素采用國際化學符號表示，例如Si，重慶角鋼廠家,Mn，重慶角鋼廠家,Cr……等?；旌舷⊥猎赜谩癛E”（或“Xt”）表示。②產(chǎn)品名稱，重慶角鋼廠家、用途、冶煉和澆注方法等，一般采用漢語拼音的縮寫字母表示，見表。③鋼中主要化學元素含量（%）采用阿拉伯數(shù)字表示。GB標準鋼號中所采用的縮寫字母及其涵義名稱漢字符號字**置名稱漢字符號字**置屈服點屈Q大寫頭多層或高壓容器用鋼高層gc小寫尾沸騰鋼沸F大寫尾鑄鋼鑄鋼ZG大寫頭半***鋼半b小寫尾軋輥用鑄鋼鑄輥ZU大寫頭***鋼鎮(zhèn)Z大寫尾地質(zhì)鉆探鋼管用鋼地質(zhì)DZ大寫頭特殊***鋼特鎮(zhèn)TZ大寫尾電工用熱軋硅鋼電熱DR大寫頭氧氣轉(zhuǎn)爐（鋼）氧Y大寫中電工用冷軋無取向硅鋼電無DW大寫頭堿性空氣轉(zhuǎn)爐（鋼）堿J大寫中電工用冷軋取向硅鋼電取DQ大寫頭易切削鋼易Y大寫頭電工用純鐵電鐵DT大寫頭碳素工具鋼碳T大寫頭超級超C大寫尾滾動軸承鋼滾G大寫頭船用鋼船C大寫尾焊條用鋼焊H大寫頭橋梁鋼橋q小寫尾高級。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="重慶角鋼廠家" src="http://tyunfile.71360.com/UploadFile/xjbjysm/637227344193935547/9982284.jpg"></div><p> 并且存在很大的內(nèi)應力，極易遭受腐蝕或生銹，因而冷拉(軋)狀態(tài)的鋼材，其包裝、儲運均有較嚴格的要求，一般均需在庫房內(nèi)保管，并應注意庫房內(nèi)的溫濕度控制。鋼材正火狀態(tài)鋼材出廠前經(jīng)正火熱處理，這種交貨狀態(tài)稱正火狀態(tài)。由于正火加熱溫度(亞共析鋼為Ac3+30～50°C，過共析鋼為Accm+30～50°C)比熱軋終止溫度控制嚴格，因而鋼材的**、性能均勻。與退火狀態(tài)的鋼材相比，由于正火冷卻速度較快，鋼的**中珠光體數(shù)量增多，珠光體層片及鋼的晶粒細化，因而有較高的綜合力學性能，并有利于改善低碳鋼的魏氏**和過共析鋼的滲碳體網(wǎng)狀，可為成品的進一步熱處理做好**準備。碳結(jié)鋼、合結(jié)鋼鋼材常采用正火狀態(tài)交貨。某些低合金高強度鋼如14MnMoVBRE、14CrMnMoVB鋼為了獲得貝氏體**，也要求正火狀態(tài)交貨。鋼材退火狀態(tài)鋼材出廠前經(jīng)退火熱處理，這種交貨狀態(tài)稱為退火狀態(tài)。退火的目的主要是為了消除和改善前道工序遺留的**缺點和內(nèi)應力，并為后道工序作好**和性能上的準備,合金結(jié)構(gòu)鋼、保證淬透性結(jié)構(gòu)鋼、冷鐓鋼、軸承鋼、工具鋼、汽輪機葉片用鋼、鐵索體型不銹耐熱鋼的鋼材常用退火狀態(tài)交貨鋼材高溫回火狀態(tài)鋼材出廠前經(jīng)高溫回火熱處理，這種交貨狀態(tài)稱為高溫回火狀態(tài)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="重慶角鋼廠家" src="http://tyunfile.71360.com/UploadFile/xjbjysm/637227344196250000/5065540.jpg"></div><p> 碳化物含量較多時，對曲線的形狀也有影響。（3）加熱溫度和保溫時間的影響——隨著加熱溫度的提高和保溫時間的延長，這使奧氏體的成分更加均勻，晶粒粗大，這些都提高過冷奧氏體的穩(wěn)定性，使C曲線右移。（二）過冷奧氏體連續(xù)冷卻轉(zhuǎn)變曲線在實際生產(chǎn)中，過冷奧氏體大多是在連續(xù)冷卻時轉(zhuǎn)變的，這就需要測定和利用過冷奧氏體連續(xù)轉(zhuǎn)變曲線。過冷奧氏體連續(xù)冷卻轉(zhuǎn)變曲線又叫CCT曲線。過冷奧氏體連續(xù)冷卻轉(zhuǎn)變曲線（CCT曲線）與過冷奧氏體等溫轉(zhuǎn)變曲線（TTT曲線）的區(qū)別：1、連續(xù)冷卻曲線靠右一些；2、連續(xù)冷卻曲線只有C曲線的上半部分，而沒有下半部分。也就是說而沒有貝氏體轉(zhuǎn)變?！钆R界冷卻速度——獲得馬氏體的**小冷卻速度?！顅k是CCT曲線的臨界冷卻速度；☆vk’是TTT曲線的臨界冷卻速度。☆vk’≈vk☆凡是使C曲線右移的因素都會減小臨界冷卻速度。過冷奧氏體等溫轉(zhuǎn)變曲線的實際應用生產(chǎn)上常用C曲線來分析鋼在連續(xù)冷卻條件下的**。（如圖）1）爐冷V1——珠光體P；2）空冷V2——索氏體S；3）油冷V3——托氏體T+馬氏體M；4）水冷V4——馬氏體M+殘余奧氏體A殘。[3]鋼退火正火退火和正火的主要目的1）調(diào)整硬度以便切削加工（170HBS~250HBS）；2）消除殘余應力，防止變形、開裂。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="重慶角鋼廠家" src="http://tyunfile.71360.com/UploadFile/xjbjysm/637227344192705079/9187241.jpg"></div></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/4235.html</p></div></div></div></div></div><div id="j1vdjtf" class="page-right twoColRt"><div 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