20CrNiMo圆钢哪里产的好 批发20CrNiMo合金钢

20CrNiMo圆钢哪里产的好 批发20CrNiMo合金钢

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333">20CrNiMo<*n style="font-family:宋体">，是中*准规定的一种合金结构钢<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">的牌号。统一数字代号:A50202

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:宋体"><*n style="color:#333333"><*n style="font-family:宋体">化学成分：

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">碳 C :0.17~0.23

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">硅 Si:0.17~0.37

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">锰 Mn:0.60~0.95

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">硫 S :<*n style="font-family:宋体">允许残余含量<*n style="font-family:Arial">≤0.035

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">磷 P :<*n style="font-family:宋体">允许残余含量<*n style="font-family:Arial">≤0.035

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">铬 Cr:0.40~0.70

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">镍 Ni:0.25~0.75

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">钼 Mo:0.20~0.30

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">铜 Cu:<*n style="font-family:宋体">允许残余含量<*n style="font-family:Arial">≤0.30

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:宋体"><*n style="color:#333333"><*n style="font-family:宋体">力学性能：

<*n style="font-size:10.5pt"><*n style="font-family:Calibri">*拉强度<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"> σb (MPa):≥980(100)

<*n style="font-size:10.5pt"><*n style="font-family:Calibri">屈服强度<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"> &sigma*Pa):≥785(80)

<*n style="font-size:10.5pt"><*n style="font-family:Calibri">伸长率<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"> δ5 (%):≥9

<*n style="font-size:10.5pt"><*n style="font-family:Calibri">断面收缩率<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"> ψ (%):≥40

<*n style="font-size:10.5pt"><*n style="font-family:Calibri">冲击功<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"> Akv (J):≥47

<*n style="font-size:10.5pt"><*n style="font-family:Calibri">冲击韧性<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">值 αkv (J/cm2):≥59(6)布氏硬度<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333">(HBS100/3000)(<*n style="font-family:宋体">退火或高温回火状态<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333">):≤197

<*n style="font-size:10.5pt"><*n style="font-family:Calibri">交货状态<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333">:<*n style="font-family:宋体">以热处理<*n style="font-family:Arial">(正火<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">、退火或高温回火<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333">)<*n style="font-family:宋体">或不热处理状态交货，交货状态应在合同中注明。

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:宋体"><*n style="color:#333333"><*n style="font-family:宋体">合金元素作用

<*n style="font-size:10.5pt"><*n style="font-family:Calibri"><*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">有三个方面:①<*n style="font-family:宋体">*钢的淬透性<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">。淬透性是指钢淬火时，从表层起淬成马氏体<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">层的深度，是取得良好综合性能的主要参数。除Co<*n style="font-family:宋体">外，几乎所有合金元素如 <*n style="font-family:Arial">Mn<*n style="font-family:宋体">、<*n style="font-family:Arial">Mo<*n style="font-family:宋体">、<*n style="font-family:Arial">Cr<*n style="font-family:宋体">、<*n style="font-family:Arial">Ni<*n style="font-family:宋体">、<*n style="font-family:Arial">Si<*n style="font-family:宋体">和<*n style="font-family:Arial">C<*n style="font-family:宋体">、<*n style="font-family:Arial">N<*n style="font-family:宋体">、<*n style="font-family:Arial">B<*n style="font-family:宋体">等都能提升钢的淬透性，其中 <*n style="font-family:Arial">Mn<*n style="font-family:宋体">、<*n style="font-family:Arial">Mo<*n style="font-family:宋体">、<*n style="font-family:Arial">Cr<*n style="font-family:宋体">、<*n style="font-family:Arial">B<*n style="font-family:宋体">的作用醉强，其次是<*n style="font-family:Arial">Ni<*n style="font-family:宋体">、<*n style="font-family:Arial">Si<*n style="font-family:宋体">、<*n style="font-family:Arial">Cu<*n style="font-family:宋体">。而强碳化物形成元素如 <*n style="font-family:Arial">V<*n style="font-family:宋体">、<*n style="font-family:Arial">Ti<*n style="font-family:宋体">、<*n style="font-family:Arial">Nb<*n style="font-family:宋体">等，只有溶于奥氏体<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">中时才能*钢的淬透性。②<*n style="font-family:宋体">影响钢的回火过程。由于合金元素在回火时能阻碍钢中各种原子的扩散，因而在同样温度下和碳素钢<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">相比，一般均起到延迟马氏体的分解和碳化物的聚集长大作用，从而提升钢的回火稳定性<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333">,<*n style="font-family:宋体">即提升钢的*回火软化能力<*n style="font-family:Arial">,V<*n style="font-family:宋体">、<*n style="font-family:Arial">W<*n style="font-family:宋体">、<*n style="font-family:Arial">Ti<*n style="font-family:宋体">、<*n style="font-family:Arial">Cr<*n style="font-family:宋体">、<*n style="font-family:Arial">Mo<*n style="font-family:宋体">、<*n style="font-family:Arial">Si<*n style="font-family:宋体">的作用比较显著，<*n style="font-family:Arial">Al<*n style="font-family:宋体">、<*n style="font-family:Arial">Mn<*n style="font-family:宋体">、<*n style="font-family:Arial">Ni<*n style="font-family:宋体">的作用不明显。含有较高含量的碳化物形成元素<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">如V<*n style="font-family:宋体">、<*n style="font-family:Arial">W<*n style="font-family:宋体">、<*n style="font-family:Arial">Mo<*n style="font-family:宋体">等的钢，在<*n style="font-family:Arial">500~600℃<*n style="font-family:宋体">回火时，析出细小弥散的特殊碳化物质点如<*n style="font-family:Arial">V4C3<*n style="font-family:宋体">、<*n style="font-family:Arial">Mo2C<*n style="font-family:宋体">、<*n style="font-family:Arial">W2C<*n style="font-family:宋体">等<*n style="font-family:Arial">,<*n style="font-family:宋体">代替部分较粗大的合金渗碳体<*n style="font-family:Arial">,<*n style="font-family:宋体">使钢的强度不再下降反而升高<*n style="font-family:Arial">,<*n style="font-family:宋体">即出现二次硬化<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333">(<*n style="font-family:宋体">见回火<*n style="font-family:Arial">)<*n style="font-family:宋体">。<*n style="font-family:Arial">Mo<*n style="font-family:宋体">对钢的回火脆性<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">有阻止或减弱的作用。③<*n style="font-family:宋体">影响钢的强化和韧化。<*n style="font-family:Arial">Ni<*n style="font-family:宋体">以固溶强化<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">方式强化铁素体<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333">;Mo<*n style="font-family:宋体">、<*n style="font-family:Arial">V<*n style="font-family:宋体">、<*n style="font-family:Arial">Nb<*n style="font-family:宋体">等碳化物形成元素<*n style="font-family:Arial">,<*n style="font-family:宋体">既以弥散硬化方式又以固溶强化方式提升钢的屈服强度<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333">;<*n style="font-family:宋体">碳的强化作用醉显著。此外，加入这些合金元素，一般都细化奥氏体晶粒<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">，增加晶界<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">的强化作用。影响钢的韧性因素比较复杂，Ni<*n style="font-family:宋体">改尚钢的韧性<*n style="font-family:Arial">;Mn<*n style="font-family:宋体">易使奥氏体晶粒粗化<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333"><*n style="font-family:宋体">，对回火脆*;<*n style="font-family:宋体">降低<*n style="font-family:Arial">P<*n style="font-family:宋体">、<*n style="font-family:Arial">S<*n style="font-family:宋体">含量，提升钢的纯净度，对改尚钢的韧性有重要作用<*n style="font-family:Arial">(<*n style="font-family:宋体">见金属的强化<*n style="font-size:10.5000pt"><*n style="background-color:#ffffff"><*n style="font-family:Arial"><*n style="color:#333333">)<*n style="font-family:宋体">。

主要区别

合金钢焊条合金钢与碳钢相比含有较多其他元素

合金钢是指钢中除含硅和锰作为合金元素或脱氧元素外，还含有其他合金元素（如铬、镍 、钼、钒、钛、铜、钨、铝、钴、铌、锆和其他元素等），有的还含有某些非金属元素（如硼、氮等）的钢。根据钢中合金元素含量的多少，又可分为低合金钢，中合金钢和高合金钢。

而碳钢主要指力学性能取决于钢中的碳含量，而一般不添加大量的合金元素的钢，有时也称为普碳钢或碳素钢。

碳钢也叫碳素钢，含碳量WC小于2%的铁碳合金。碳钢除含碳外一般还含有少量的硅、锰、硫、磷 按用途可以把碳钢分为碳素结构钢、碳素工具钢和易切削结构钢三类。碳素结构钢又分为建筑结构钢和机器制造结构钢两种 按含碳量可以把碳钢分为低碳钢（WC ≤ 0.25%）,中碳钢（WC0.25%——0.6%）和高碳钢（WC>0。6%） 按磷、硫含量可以把碳素钢分为普通碳素钢（含磷、硫较高）、优良碳素钢（含磷、硫较低）和*优良钢（含磷、硫更低） 一般碳钢中含碳量较高则硬度越高，强度也越高，但塑性较低。

20CrNiMo圆钢哪里产的好 批发20CrNiMo合金钢