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NM500特種鋼板-耐候鋼/耐腐蝕鋼板系列
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用礦山機械、煤礦機械目錄1定義2耐磨鋼板加工?化學(xué)成分?機械性能3取樣試驗方法定義播報編輯命名:N是"耐磨"中"耐"的第一個拼音字母。M是"耐磨"中"磨"的第一個拼音字母。500是布氏硬度值HB值。（500硬度值是廣義的，國產(chǎn)硬度值是在500左右。）應(yīng) 用：耐磨鋼板被廣泛應(yīng)用工程機械、 環(huán)保機械、冶金機械、磨具、軸承等產(chǎn)品零部件。耐磨鋼板加工播報編輯1、鋼板切割方法適用于冷切割和熱切割。冷切割包括有水射流切割、剪切、鋸切或磨料切割；熱切割包括有氧氣燃料火焰切割（以下簡稱“火焰切割”）、等離子切割和激光切割。2、切割方法：通過相關(guān)工藝試驗，掌握鋼板各種切割方法的一般特性和切割厚度范圍。3、高級別耐磨鋼的火焰切割方法與普通低碳和低合金鋼的切割一樣簡單，在切割耐磨鋼厚板時，需要注意?。?！隨著鋼板厚度和硬度的增加，切割邊部出現(xiàn)裂紋傾向加大。為防止鋼板切割裂紋的產(chǎn)生，切割時應(yīng)遵循以下建議：切割裂紋：鋼板切割裂紋類似于焊接時產(chǎn)生氫致裂紋，如果鋼板切邊產(chǎn)生裂紋，將會在切厚48小時至幾周內(nèi)才出現(xiàn)。因此，切割裂紋屬于延遲性裂紋，鋼板厚度和硬度越大，出現(xiàn)切割裂紋就越大。預(yù)熱切割：預(yù)防鋼板切割裂紋最有效的方法，就是在切割前進行預(yù)熱。在進行火焰切割前，鋼板通常都要預(yù)熱，其預(yù)熱溫度高低主要取決于鋼板質(zhì)量等級和板厚，見表2.預(yù)熱方法可采用火焰燒槍、電子加熱墊進行的，也可以使用加熱爐加熱。為確定鋼板預(yù)熱效果，應(yīng)在加熱點被面測試所需溫度。注意：預(yù)熱特別注意，要使正個鋼板界面均勻受熱，以免接觸熱源的區(qū)域出現(xiàn)局部過熱現(xiàn)象。低速切割：避免切割裂紋的另一種方法就是降低切割速度。如果無法進行整版預(yù)熱，則可以使用局部預(yù)熱法代替。使用低速切割方法防止切割裂紋，其可靠性不如預(yù)熱。我們建議切割前先對切割帶用火焰槍空泡幾趟進行預(yù)熱，預(yù)熱溫度達(dá)到100°C左右為宜。其最大切割速度取決于鋼板等級和厚度特別說明：將預(yù)熱和低速兩種火焰切割方法結(jié)合使用，可以進一步降低切割裂紋的出現(xiàn)幾率。切割后緩冷要求：無論對切割不見是否預(yù)熱，鋼板切割后的緩冷都會有效降低切割裂紋的風(fēng)險。如果切割后將其帶有溫?zé)岬牟灰娺M行堆放，使用隔熱毯將其覆蓋，也可以實現(xiàn)緩冷，緩冷要求冷卻到室溫。切割后加熱要求：對于耐磨鋼板的切割，切割后立即采取加熱（低溫回火），也是預(yù)防切割裂紋的有效方法和措施。鋼板切厚通過低溫回火處理，可以有效消除切割參與應(yīng)力（低溫回火工藝；保濕時間安5min/mm）對于切割后加熱的方法，也采用燃燒槍、電子加熱毯和節(jié)哀熱爐的加熱方式進行切割后的加熱。4、降低鋼板軟化的措施鋼的抗軟化特性主要取決于它的化學(xué)成分、微觀組織和加工方式。對于熱切割的部件，部件越小，整個部件軟化的風(fēng)險就越大。如果鋼板溫度超過200-250°C，鋼板硬度就會降低。切割方法：鋼板在切割小型部件時，焊槍和預(yù)熱所供應(yīng)的熱量將會在工件中聚集。切割不見尺寸越小，切割工件尺寸不得小于200mm，否則工件就將有軟化的風(fēng)險。消除軟化風(fēng)險的最好的辦法是冷切割，例如水射流切割。若必須使用熱切割，則有限選擇等離子或激光切割。這是因為火焰切割給工件提供更多的熱量，因此提高了工件的溫度。水下切割方法：限制和降低軟化區(qū)范圍的有效方法，在切割過程中使用水來楞伽鋼板及切割表面。因此，鋼板即可放在水中切割，也可以向切割面噴水進行切割。使用水下切割方法可選擇等離子或火焰切割。水下切割具有以下特征：切割熱影響區(qū)小；防止整個工件的硬度降低；減少切割工件變形；切割后可以直接對工件進行冷卻。化學(xué)成分此化學(xué)成分為新鋼產(chǎn)調(diào)質(zhì)型耐磨鋼板 執(zhí)行企業(yè)標(biāo)準(zhǔn)Q/XGJ成分CSiMnPSCrMoNiBtCEVnm500≤0.38≤0.70≤1.70≤0.020≤0.010≤1.20≤0.65≤1.000.005-0.0060.65nm50013027761751現(xiàn)貨機械性能此機械性能為新鋼產(chǎn)調(diào)質(zhì)型耐磨鋼板 執(zhí)行企業(yè)標(biāo)準(zhǔn)Q/XGJ牌號厚度抗拉強度延伸率—20℃沖擊功（縱向）AKV/J布氏硬度HBW冷彎6～60——≥24480～525試樣寬度B=30MM彎曲角度180°彎心直徑dw4n取樣試驗方法播報編輯序號檢驗項目取樣數(shù)量取樣方法試驗方法1拉伸1GB/T2975-82GB228/T-20022沖擊3GB/T2975-82GB/T229-19943硬度1GB/T2975-82GB231-84硬度檢驗：在鋼板表面銑掉1.0-2.5mm，然后在此表面進行硬度檢驗。一般推薦您銑掉2.0mm，進行硬度檢驗。 [1]新手上路成長任務(wù)編輯入門編輯規(guī)則本人編輯我有疑問內(nèi)容質(zhì)疑在線客服官方貼吧意見反饋投訴建議舉報不良信息未通過詞條申訴投訴侵權(quán)信息封禁查詢與解封?2025?Baidu?使用百度前必讀?|?百科協(xié)議?|?隱私政策?|?百度百科合作平臺?|?京ICP證030173號?京公網(wǎng)安備11000002000001號window.PAGE_DATA= 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