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25MNTIBRE合金圓鋼-合金結構鋼
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[2]。其廣泛應用于制造拖拉機滲碳齒輪、汽車變速器齒輪等中等負荷機械零件，可替代20CrMnTi、20CrMo等傳統(tǒng)材料。該鋼材通過添加硼元素實現(xiàn)淬透性強化，熱軋后可直接冷成形加工，能簡化熱處理工藝并降低生產(chǎn)成本約25% [2]。雖存在齒輪熱處理變形略大于鉻鋼的缺點，但在軍工領域也有應用記錄，并在國際標準體系中被列入合金結構鋼牌號對照表。中文名合金結構鋼外文名屬 性合金鋼材標 準GB/T 3077-2015目錄1產(chǎn)品介紹2力學性能3主要特性4應用舉例產(chǎn)品介紹播報編輯 [1]統(tǒng)一數(shù)字代號：A74252C：0.22～0.28Si：0.20～0.45Mn：1.30～1.60B：0.0005～0.0035Ti：0.04～0.10P：≤0.035S：≤0.035Cr：≤0.30Cu：≤0.30Ni：≤0.30Mo：≤0.15力學性能播報編輯試樣毛坯尺寸（mm）：試樣熱處理：第一次淬火加熱溫度（℃）：860；冷卻劑：油第二次淬火加熱溫度（℃）：-回火加熱溫度（℃）：200；冷卻劑：水、空抗拉強度（σb/MPa）：≧1380屈服點（σs/MPa）：-斷后伸長率（δ5/%）：≧10斷面收縮率（ψ/%）：≧40沖擊吸收功（Aku2/J）：≧47布氏硬度（HBS100/3000）（退火或高溫回火狀態(tài)）：≦229主要特性播報編輯此鋼的綜合力學性能優(yōu)于20CrMnTi鋼，同時具有良好的工藝性能。鋼的淬透性較好，在油中臨界淬透直徑達17～27mm；冷熱加工性能良好，鍛造溫度較寬，氧化皮疏松，容易清理。正火后可以獲得較均勻分布的珠光體和鐵素體組織，可切削性能良好，滲碳后碳份分布平緩，淬火后表面金相組織正常。稀土加入后，低溫沖擊韌性提高，缺口敏感性降低。此鋼的缺點是：制造的齒輪熱處理變形一般比鉻鋼齒輪稍大。應用舉例播報編輯主要用來代替20CrMnTi、20CrMo等鋼制造承受中等負荷的拖拉機滲碳齒輪，其使用性能優(yōu)于20CrMnTi鋼。新手上路成長任務編輯入門編輯規(guī)則本人編輯我有疑問內容質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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