portant;">4140小圆棒现货规格：4 5 6 7 8 9 10 11 12 13 14 15 16 18 20........
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portant;">4140大圆棒规格现货：300 320 340 360 380 400 420 440 460 480 500 长度可按客户要求切
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portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">4140简介
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portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">4140钢材属中等淬透性钢,热处理后有较好的强度和良好的综合力学性能,工艺性好,成材率高。高使用温度为 427℃。可用作汽轮机紧固件.
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portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">4140特性和适用范围
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portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">有较高的疲劳强度和低的缺口敏感性,低温冲击韧度也较高,无明显回火脆性,主要在调质状态下使用。用于制造承受冲击载荷下的高强度零件和截面较大的零件及其他受力构件。如卧式锻造机的传动偏心轴、锻压机的曲轴等。
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portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">化学成份:
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;"> 锰 Mn:0.80~1.20
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 硫 S :允许残余含量≤0.035
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 磷 P :允许残余含量≤0.035
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 铬 Cr:0.90~1.20
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 镍 Ni:允许残余含量≤0.030
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 铜 Cu:允许残余含量≤0.030
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 钼 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;">力学性能:
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 抗拉强度 σb (MPa):≥980(100)
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 屈服强度 σs (MPa):≥785(80)
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 伸长率 δ5 (%):≥10
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portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;">断面收缩率 ψ (%):≥45
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 冲击功 Akv (J):≥63
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 冲击韧性值 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;"> 试样尺寸:试样毛坯尺寸为25mm
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portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 热处理规范及金相组织:
portant; font-size: 18.06px; line-height: 30px; list-style-type: none; margin: 0px; padding: 0px;"> 热处理规范: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;"> 金相组织:回火索氏体。
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