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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\/27SIMN"; 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(wèn)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); }); }(); 27SiMn 這種鋼的性能優(yōu)于30Mn2鋼，淬透性較高，在水中臨界淬透直徑達(dá)8~22mm，可切削性良好，冷變形塑性及焊接性中等;另外鋼在熱處理時(shí)韌性減低不多，但卻有相當(dāng)高的強(qiáng)度和耐磨性，特別是水淬時(shí)仍有較高的韌性;但是此鋼對(duì)白點(diǎn)敏感性大，熱處理時(shí)有回火脆性傾向及過(guò)熱敏感性。試樣毛坯尺寸(mm):25抗拉強(qiáng)度(σb/MPa):≧980屈服點(diǎn)(σs/MPa):≧835斷后伸長(zhǎng)率(δ5/%):≧12斷面收縮率(ψ/%):≧40沖擊吸收功(Aku2/J):≧39布氏硬度(HBS100/3000)(退火或高溫回火狀態(tài)):≦217【應(yīng)用舉例】這種鋼主要在調(diào)質(zhì)狀態(tài)下使用，用于制造要求高韌性和耐磨性的熱沖壓件;也可在正火或熱軋供應(yīng)狀態(tài)下使用，如拖拉機(jī)的履帶銷(xiāo)等。1、流體用無(wú)縫鋼管:GB8163-20082、鍋爐用無(wú)縫鋼管:GB3087-20083、鍋爐用高壓無(wú)縫管:GB5310-2008(ST45.8-Ⅲ型)4、化肥設(shè)備用高壓無(wú)縫鋼管:GB6479-20005、地質(zhì)鉆探用無(wú)縫鋼管:YB235-706、石油鉆探用無(wú)縫鋼管:YB528-657、石油裂化用無(wú)縫鋼管:GB9948-888、石油鉆鋌專(zhuān)用無(wú)縫管:YB691-709、汽車(chē)半軸用無(wú)縫鋼管:GB3088-199910、船舶用無(wú)縫鋼管:GB5312-199911、冷拔冷軋精密無(wú)縫鋼管:GB3639-1999各種合金管16Mn、27SiMn、15CrMo、35CrMo、12CrMov、20G、40Cr,12Cr1MoV,15CrMo鋼管按生產(chǎn)工藝不同分為無(wú)縫鋼管和焊接鋼管兩類(lèi)。無(wú)縫鋼管是由鋼錠、管坯或鋼棒穿孔制成的無(wú)縫的鋼管。主要用于液壓支柱鋼管。折疊編輯本段重量公式圖片27SiMn圖片27SiMn無(wú)縫鋼管每米重量W=0.02466*S(D-S)符號(hào)意義 :D=外徑 S=壁厚計(jì)算舉例 :外徑為60mm壁厚4mm的無(wú)縫鋼管，求每m重量。每m重量=0.02466*4*(60-4)=5.52Kg