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........ 

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

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portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">4140簡(jiǎn)介

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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(qiáng)度和良好的綜合力學(xué)性能,工藝性好,成材率高。高使用溫度為 427℃?？捎米髌啓C(jī)緊固件.

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

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

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

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

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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

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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。

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