<p>1. 溶于铁中 几乎所有的合金元素(除Pb外)都可溶入铁中, 形成合金铁素体或合金奥氏体, 按其对α-Fe或γ-Fe的作用, 可将合金元素分为扩大奥氏体相区和缩小奥氏体相区两大类。 扩大γ相区的元素—亦称奥氏体稳定化元素, 主要是Mn、Ni、Co、C、N、Cu等, 它们使A3点(γ-Fe α-Fe的转变点)下降, A4点( γ-Fe的转变点)上升, 从而扩大γ-相的存在范围。其中Ni、Mn等加入到一定量后, 可使γ相区扩大到室温以下, 使α相区消失, 称为完全扩大γ相区元素。另外一些元素(如C、N、Cu等), 虽然扩大γ相区, 但不能扩大到室温, 故称之为部分扩大γ相区的元素。 缩小γ相区元素——亦称铁素体稳定化元素, 主要有Cr、Mo、W、V、Ti、Al、Si、B、Nb、Zr等。它们使A3点上升, A4点下降(铬除外, 铬含量小于7%时, A3点下降; 大于7%后,A3点迅速上升), 从而缩小γ相区存在的范围, 使铁素体稳定区域扩大。按其作用不同可分为完全封闭γ相区的元素(如Cr、Mo、W、V、Ti、Al、Si等)和部分缩小γ相区的元素(如B、Nb、Zr等)。</p>
<p>不锈钢无缝管 304 φ32*2 温州 23100 0 0 0 <br />
不锈钢无缝管 304 φ45*3-4 温州 22800 0 0 0 <br />
不锈钢无缝管 304 φ57*3-4 温州 22800 0 0 0 <br />
不锈钢无缝管 304 φ76*4-6 温州 22800 0 0 0 <br />
不锈钢无缝管 304 φ89*4-5 温州 22800 0 0 0 <br />
不锈钢无缝管 304 φ108*4-5 温州 23800 0 0 0 </p>
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