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百度百科-驗證 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\/25MNTIBRE"; 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，請進(jìn)行驗證', 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: '驗證失敗，請重新驗證' }); 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); }); }(); 25MnTiBRE 25MnTiBRE，合金結(jié)構(gòu)鋼。統(tǒng)一數(shù)字代號:A74252 執(zhí)行標(biāo)準(zhǔn):GB/T 3077-1999折疊化學(xué)成分C: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折疊力學(xué)性能試樣毛坯尺寸(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折疊編輯本段主要特性此鋼的綜合力學(xué)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(dá)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。折疊