portant;">4140小圓棒現(xiàn)貨規(guī)格：4  5  6  7  8  9  10  11  12  13  14  15  16  18  20........ 

portant;">

portant;">4140大圓棒規(guī)格現(xiàn)貨：300  320  340  360  380  400  420  440  460  480  500 長度可按客戶要求切

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">4140簡介

portant;">

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">4140鋼材屬中等淬透性鋼,熱處理后有較好的強度和良好的綜合力學性能,工藝性好,成材率高,。高使用溫度為 427℃。可用作汽輪機緊固件.

portant;">

portant;">

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">4140特性和適用范圍

portant;">

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">有較高的疲勞強度和低的缺口敏感性,低溫沖擊韌度也較高,無明顯回火脆性,主要在調質狀態(tài)下使用。用于制造承受沖擊載荷下的高強度零件和截面較大的零件及其他受力構件。如臥式鍛造機的傳動偏心軸,、鍛壓機的曲軸等,。

portant;">

portant;">

portant;">

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">化學成份:
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 碳 C :0.37~0.45
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 硅 Si:0.17~0.37
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 錳 Mn:0.80~1.20
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 硫 S :允許殘余含量≤0.035
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 磷 P :允許殘余含量≤0.035
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 鉻 Cr:0.90~1.20
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 鎳 Ni:允許殘余含量≤0.030
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 銅 Cu:允許殘余含量≤0.030
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 鉬 Mo:0.15~0.30

portant;">

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 

portant;">

portant;">

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">力學性能:
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 抗拉強度 σb (MPa):≥980(100)
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 屈服強度 σs (MPa):≥785(80)
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 伸長率 δ5 (%):≥10

portant;">

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">斷面收縮率 ψ (%):≥45
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 沖擊功 Akv (J):≥63
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 沖擊韌性值 αkv (J/cm2):≥78(8)
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 硬度 :≤217HB
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 試樣尺寸:試樣毛坯尺寸為25mm

portant;">

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 熱處理規(guī)范及金相組織:
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 熱處理規(guī)范:淬火850℃,油冷;回火600℃,水冷,、油冷,。
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 金相組織:回火索氏體,。

portant;">

portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">