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。簡(jiǎn)稱“120”鋼是我國(guó)研制的。本鋼種冶金生產(chǎn)工藝比較簡(jiǎn)便，質(zhì)量易于控制，且共晶碳化物量少，從而克服了Cr12型鋼共晶碳化物級(jí)別過(guò)高而造成的一系列危害，并能節(jié)約三分之二左右的鉻 [1]。中文名簡(jiǎn) 稱“120”鋼領(lǐng) 域金屬材料學(xué)目錄1性質(zhì)2熱處理工藝性質(zhì)播報(bào)編輯Cr4w2Mov鋼中的鉻是為了使鋼具有較高的淬透性，一部分鉻還可以生成鉻化物，有利于提高鋼的耐磨性。w、Mo、V都有利于提高熱穩(wěn)定性和產(chǎn)生二次硬化，它們各自的含量，是考慮到下述因素而決定的：加w過(guò)多會(huì)增加碳化物的不均勻性，以Mo代W可以改善碳化物的分布，加入1%的釩可以生成一部分在淬火加熱時(shí)尚未溶解的Vc以提高耐磨性，但加釩過(guò)多將使鋼的磨削性能變壞。含碳量的規(guī)定是考慮到能生成足夠數(shù)量的碳化物以得到高的耐磨性，但又不致過(guò)多而使鋼的性能(退火硬度、韌性等)變壞。稍增加鋼中的硅，是為了能提高回火穩(wěn)定性 [1]。熱處理工藝播報(bào)編輯采用最佳熱處理規(guī)范時(shí)的機(jī)械性能高于或接近于Cr12MoV鋼。生產(chǎn)實(shí)踐證明，本鋼種熱處理工藝簡(jiǎn)單、變形很微，而且可以通過(guò)多次回火進(jìn)行控制。耐磨性超過(guò)Cr12MoV鋼，有“高耐磨冷作模具鋼”之稱?！しN鍛造溫度范圍較窄，鍛造時(shí)要控制好溫度。始鍛溫度過(guò)高，會(huì)出現(xiàn)軸心鍛裂。實(shí)踐表明，當(dāng)鍛造溫度低于850℃時(shí)，變形抗力很大，塑性降低，也會(huì)出現(xiàn)裂口。但只要掌握好鍛造要點(diǎn)，掌握好火候，鍛造是沒(méi)有困難的。如果掌握了Cr12型鋼的鍛造方法，的鍛造更不成問(wèn)題 [1]。新手上路成長(zhǎng)任務(wù)編輯入門(mén)編輯規(guī)則本人編輯我有疑問(wèn)內(nèi)容質(zhì)疑在線客服官方貼吧意見(jiàn)反饋投訴建議舉報(bào)不良信息未通過(guò)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(tái)?|?京ICP證030173號(hào)?京公網(wǎng)安備11000002000001號(hào)window.PAGE_DATA= 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Cr4W2MoV Cr4W2MoV鋼是一新型中合金鋼冷作模具鋼，性能比較穩(wěn)定，其模具的使用壽命較Cr12、Cr12MoV鋼有較大的提高。中文名 Cr4W2MoV 性 質(zhì) 合金鋼冷作模具鋼 優(yōu) 點(diǎn) 性能比較穩(wěn)定 特 點(diǎn) 較高的淬透性和淬硬性Cr4W2MoV鋼是一新型中合金鋼冷作模具鋼，性能比較穩(wěn)定，其模具的使用壽命較Cr12、Cr12MoV鋼有較大的提高。Cr4W2MoV鋼的主要特點(diǎn)是共晶碳化物顆粒細(xì)小，分布均勻，具有較高的淬透性和淬硬性，并具有較好的耐磨性和尺寸穩(wěn)定性。該鋼熱加工溫度范圍窄，變形抗力較大。經(jīng)實(shí)際使用證明Cr4W2MoV鋼是性能良好的冷作模具鋼，可用來(lái)制造各種沖模、冷鐓模、落料模、冷擠壓凹模及挫絲板等工模具。Cr4W2MoV特性該鋼是針對(duì)Cr12系鋼的缺點(diǎn)而研制的一種代用鋼, 具有良好的耐磨性和二次硬化能力。該鋼的共晶碳化物顆粒細(xì)小, 分布均勻, 具有較高的淬透性和淬硬性, 以及較好的耐磨性和尺寸穩(wěn)定性。但鋼的熱加工溫度范圍較窄, 變形抗力較大。為獲得≤255HBW 的硬度,該鋼的等溫持續(xù)時(shí)間不能小于6~8h。淬硬深度φ150mm×150mm,可內(nèi)外淬火,硬度達(dá)60HRC,空淬深度 40~50mm。該鋼性能比較穩(wěn)定, 其模具的使用壽命較 Cr12、Cr12MoV 鋼有較大的提高。該鋼的鍛造溫度范圍窄小,易于過(guò)熱、過(guò)燒、鍛裂。可按Cr12系鋼的方法進(jìn)行鍛造。φ98mm 的淬火試樣, 在980℃空冷淬?以后, 其心部硬度達(dá)到58~60HRC, 表面硬度達(dá)到 63 -67HRC。在溫度為 1020°C 時(shí)淬火、400°C 回火時(shí)韌性最好;在500~520°C回火1~3 次以后，有較好的二次硬化性, 韌性下降, 抗彎強(qiáng)度呈現(xiàn)峰值, 抗壓屈服強(qiáng)度比 Cr12MoV鋼高10%左右。該鋼的淬火變形趨勢(shì)和 Cr12 系鋼相似, 有較好的伸縮性。 [1] 供貨狀態(tài)供貨品種為熱軋材、鍛材。硬度≤269HBW.化學(xué)成分Cr4W2MoV鋼的化學(xué)成分示于表2-6-1。表2-6-1 Cr4W2MoV鋼的化學(xué)成分（GBT 1299—2000）ω%C:1.12~ 1.25Si:0.40~ 0.70Mn:≤0.40Cr:3.50~W:1.90~2.00Mo:0.80~1.20V:0.80~1.10P:≤0.030S:≤0.030熱處理工藝該鋼退火軟化較困難，一般采用等溫球化退火。退火工藝：加熱溫度為850~870度，保溫4~6H，等溫溫度為760度，保溫6~8H，爐冷到600度以下出爐空冷，硬度為229HBW。淬火加熱溫度為960~980度，油冷或空冷，硬度62HRC；回火溫度為280~300度，回火3次，每次1H?；鼗鹩捕?0~62HRC。采用高溫淬火、高溫回火（1030度淬火，520度回火三次）的模具鋼具有高耐磨性和熱硬性。采用較低溫度淬火、較低溫度回火（900~980度淬火，200~290度回火）的模具具有良好的強(qiáng)韌性。典型應(yīng)用舉例1) 主要用于硅鋼片沖裁模具。2) 該鋼可用于制作材料厚度3mm 的沖裁模具復(fù)雜形狀的凸模、凹模、鑲塊,制作凸模時(shí)建議硬度 58 ~62HRC, 制作凹模時(shí)推薦硬度 60 ~ 64HRC。3) 用于制作沖裁模具中要求高耐磨、復(fù)雜形狀的凸模、凹模和鑲塊, 制作凸模時(shí)建議硬度 60 ~ 64HRC, 制作凹模時(shí)建議硬度 60 ~64HRC。4) 用于鋁件、銅件、鋼件冷擠壓模的凹摸, 建議凹模硬度62~64HRC。5) 用于制作各種沖模、冷鐓模、落料模、拉深模、冷擠壓凹摸和搓絲板等。6) 是成批或大生產(chǎn)批量冷沖模的基本鋼種。7) 對(duì)該鋼制冷鐓凹模采用形變正火處理+等溫球化退火+高溫淬、高溫回火+硫、碳、氮三元共滲的復(fù)合強(qiáng)韌化處理新工藝, 可在提高模具基體強(qiáng)韌性的基礎(chǔ)上, 提高模具型腔表面層的硬度和耐磨性, 有效地提高模具的使用壽命。8) Cr4W2MoV 鋼制凸模采用 1020°C加熱, 260°c ×1h 等溫淬火, 220°C ×1h×2 次回火, 硬度為 58 -59HRC。模具平均使用壽命 898件。9) 鋼板彈簧沖孔凸模原使用 Cr12MoV 銦, 模具使用壽命為 265 件, 而改用Cr4W2MoV 鋼, 凸模使用壽命為 491 件, 如對(duì)Cr4W2MoV鋼制凸模進(jìn)行 920℃×4h 鹽浴滲釩, 使用壽命可達(dá) 845 件。參考資料
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