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百度百科-驗(yàn)證 if (!window['__abbaidu_2020_subidgetf']) { window['__abbaidu_2020_subidgetf'] = function () { var subid = 01000000; return subid; }; } !function(){ var $ = require('wiki-common:widget/lib/jquery/jquery'); var Dialog = require('wiki-common:widget/ui/dialog/dialog'); var ClickstreamSdk = require('wiki-common:widget/util/clickstreamSdk'); var clickstream = new ClickstreamSdk.default({ appname: 'baike', platform: 'web', device: 'pc', page: 'spam', auto: true }); var sourceUrl = "\/item\/G20CRNI2MO"; var fromPage = "pc_lemma_page_risk_score"; var logParam = { page: 'spam', fromPage: fromPage } clickstream.logActEvent($.extend({}, logParam, {'act_type': 'show'})); function init() { if (window.sdkMachine) { var machineSDK = new window.sdkMachine({ container: document.body, title: '訪問異常，請(qǐng)進(jìn)行驗(yàn)證', ak: 'GHm64ouBF7GGAhXNcsae9xiVByAGWhMI', deviceType: 'pc', type: 'spin', testUrl: '', initApiSuccessFn: function() { machineSDK.init(); }, errorFn: function(err) { alert('errfn___' + err.message || '') }, verifySuccessFn: function(result) { $.ajax({ type: 'GET', url: '/api/anticrawl/captchaverify', dataType: 'json', data: { ds: result.ds, passTk: result.tk, clientType: 'pc', tk: "d4b87f38b35a5e84f28e8674b41132db", sourceFrom: fromPage }, success: function(res) { if (res && res.errno === 0 && !res.isSpam) { clickstream.logActEvent($.extend({}, logParam, {'act_type': 'verify-pass'})); if (sourceUrl) { machineSDK.close(); window.location.href = sourceUrl; } } else { var submitInform = Dialog.inform({ icon: 'WARNING', mainMsg: '驗(yàn)證失敗，請(qǐng)重新驗(yàn)證' }); submitInform.show(); setTimeout(function() { submitInform.hide(); }, 3000); machineSDK.close(); init(); } } }); }, verifyFailFn: function() { }, feedbackEvent: function(feedback) { return true; }, }); } }; init(); }(); !function(){ require('wiki-common:widget/component/psLink/psLink'); var clickstream = require('wiki-common:packages/utils/logger'); clickstream.logViewPage({ page: 'all-pc' }); var tmpBaiduId = ''; require(['wiki-common:widget/util/setBaikeTmpBaiduId.es'], function (setBaikeTmpBaiduId, cookie) { setBaikeTmpBaiduId(tmpBaiduId); }); }(); 簡介 20CrNi2Mo合金結(jié)構(gòu)鋼20CrNi2Mo鋼是一種優(yōu)質(zhì)低碳中 [1]  ，由于其合金元素含量低，各種合金元素協(xié)同配合效果較好，在世界主要工業(yè)國家中，均將其列為推薦標(biāo)準(zhǔn)牌號(hào)。20CrNi2Mo鋼可以作為表面強(qiáng)化型的滲碳鋼應(yīng)用于滲碳齒輪、滲碳軸承等零件上；也可以經(jīng) [2]  、低溫回火后應(yīng)用于諸如挖掘機(jī)斗齒(鎬牙)、農(nóng)用機(jī)械磨損件等要求耐磨損、耐沖擊的零件上。美國的SAE4320、臺(tái)灣地區(qū)和日本的SNCM420、原蘇聯(lián)的20ХН2М等鋼在化學(xué)成分和一些主要性能指標(biāo)上與我國的20CrNi2Mo鋼均是相同或相近的?；瘜W(xué)成分錳 Mn：0.40~0.70磷 P：≤0.030硫 S：≤0.030鉻 Cr：0.35~0.65鎳 Ni：1.60~2.00鉬 Mo：0.20~0.30銅 Cu：≤0.3020CrNi2Mo鋼變形傾向明顯小于20Cr2Ni4鋼，其碳濃度梯度分布合理，硬化性能好，表層殘余奧氏體含量及分布理想，熱處理工藝性能優(yōu)于20Cr2Ni4鋼。可替代20cr2Ni4。