20MN特種鋼板-碳素鋼/模具鋼系列
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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\/20MN"; 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); }); }(); 牌號:20Mn特性及適用范圍:高錳低碳滲透鋼,性能與15Mn鋼相似。含錳(W mn 0.70%-1.00%)較高的低碳滲碳鋼,因錳高故其 強度.塑性.可切削性和淬透性均比15鋼稍高,滲碳與淬火時表面形成軟點較少,宜進行滲碳.碳氮共滲處理,得到表面耐磨而心部韌性好的綜合性能。熱軋或正火處理后韌性好。 適用于齒輪、曲柄軸、支架、絞鏈、螺釘、螺母、鉚焊結構件、制造油罐等。寒冷地區(qū)農(nóng)具,如奶油罐等?;瘜W成分碳 C :0.17~0.24硅 Si:0.17~0.37錳 Mn:0.70~1.00硫 S :≤0.035磷 P :≤0.035鉻 Cr:≤0.25鎳 Ni:≤0.25銅 Cu:≤0.25力學性能抗拉強度 σb (MPa):≥450(46)屈服強度 σs (MPa):≥275(28)伸長率 δ5 (%):≥24斷面收縮率 ψ (%):≥50試樣尺寸:試樣尺寸為25mm熱處理規(guī)范及金相組織:熱處理規(guī)范:正火,910℃。區(qū)別20Mn與20Mn2的區(qū)別:這兩種鋼的化學成分(含碳量相同,含錳量不同)、力學性能、熱處理方式都有不同,主要區(qū)別如下:20Mn-屬優(yōu)質(zhì)碳素結構鋼化學成分(%): C: 0.17~0.23Si: 0.17~0.37Mn: 0.7~1.00Cr≤ 0.25Ni≤ 0.30Cu≤0.25力學性能:抗拉強度≥450MPa屈服極限≥275MPa伸長率≥24%斷面收縮率≥50%熱處理:正火、碳、氮共滲20Mn2-合金結構鋼化學成分(%):C: 0.17~0.24Si: 0.17~0.37Mn:1.40~1.80力學性能:抗拉強度≥785MPa屈服極限≥590MPa 伸長率≥10%斷面收縮率≥40%沖擊吸收功≥47Aku2/J熱處理:淬火(水、油淬)、回火(水、空冷)、滲碳