4145H合金圓鋼-合金結(jié)構(gòu)鋼
專業(yè)為您提供合金結(jié)構(gòu)鋼牌號,材質(zhì)單,在線報價單 歡迎選購
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\/4145H"; 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); }); }(); 4145H 20#是20鋼的簡易寫法,屬鋼材中的一種材質(zhì)。常用于制造無縫鋼管,模具,優(yōu)質(zhì)碳素鋼板,槽鋼,工字鋼等鋼材。化學成分:此種材質(zhì)中碳的含量,大概在0.2%左右。此種材質(zhì),相對于其他的優(yōu)碳鋼,也較普遍。20鋼:平均含碳量為0.17-0.23%,平均含硅量為0.17-0.37%,平均含錳量為0.35-0.65%,平均含硫量≤0.035%,平均含磷量≤0.035%,平均含鉻量≤0.20%,平均含鎳量≤0.30%,含銅0.20%左右。4145H石油鉆具用鋼采用電弧爐+爐外精煉鋼組: 結(jié)構(gòu)鋼次級類別: AISI 4145H Steel注釋: Chromium-Molybdenum H-Steel化學成分元素 小 大 近似的C 0.4200 0.4900Si 0.1500 0.3500Mn 0.6500 1.1000P 0.0350S 0.0400Cr 0.7500 1.2000Mo 0.1500 0.2500用途石油鉆鋌用鋼,可做加重鉆桿,整體加重鉆桿的原材料用鋼是AISI 4145H合金結(jié)構(gòu)鋼,生產(chǎn)工藝嚴格執(zhí)行SY/T5146-1997標準,加重鉆桿是一種中等重量,類似于鉆桿的鉆具,其壁厚比鉆桿大,比鉆鋌小,其厚壁管體上連接有特別加長的鉆桿接頭,一般在組成鉆柱時加在鉆桿和鉆鋌之間,防止鉆柱截面的突然變化,減少鉆桿的疲勞。在定向井中使用,可以在較低扭矩的情況下高速鉆進,減少了鉆柱的磨損和破損,由于其鋼性比鉆鋌小,和井壁接觸面積小,也不容易形成壓差卡鉆。