904L不锈钢（合金钢板）耐酸 耐腐蚀904L高镍合金钢

904 l super 904 l austenitic stainless steel belongs to low carbon high nickel, molybdenum, 904 l austenitic stainless acid-resistant steel proprietary material for h. S company in France. Has the very good activation - passivation shift ability, excellent corrosion resistance, in the oxidizing acid such as sulfuric acid, acetic acid, formic acid, phosphoric acid have good corrosion resistance of 904 l steel plate, in neutral medium containing chloride ions has the very good resistance to pitting corrosion, and has good resistance crevice corrosion and stress corrosion resistance. Applicable to various concentrations of sulphuric acid under 70 ℃, under ordinary conditions of pressure resistance to any concentration, temperature of acetic acid and formic acid and acetic acid in mixed acid corrosion resistance is very good also. A low carbon high alloy austenitic stainless steel, in the dilute sulphuric acid have good corrosion resistance, specially designed for harsh environment corrosion conditions. With high content of chromium and nickel content enough, the addition of copper make it has strong acid resistance, especially for chloride clearance corrosion and stress corrosion cracking are highly resistant, not easy appeared pitting spots and cracks

904L马氏体不锈钢典型的基体金属显微组织为回火马氏体。这种低碳回火马氏体组织具有很高的强度和韧性。根据含镍量的不同、热处理条件的差异，一些牌号的马氏体不锈钢基体显微组织中可能会出现10%～40%的细小弥散状残留奥氏体。对于含铬16%等级的马氏体不锈钢，显微组织中可能出现少量的δ铁素体。为了获得理想的细晶粒回火马氏体，在钢板交货之前一般都经过淬火加回火处理。

　　屈服应力：б0.2为550～850MPa

　　抗拉强度：бb＞520MPa

　　冲击强度：≥50焦耳

　　延伸率：δ≥35%

机械性能：马氏体不锈钢含铬13%，由于铁素体晶粒在焊接过程中粗化和硬化，而使其可焊性很差。以往，这类不锈钢的用途严格限制于非焊接零件的安装。经过冶炼工艺的不断改进，降低了马氏体不锈钢中的碳、氮、硫含量，又增加了一定量的镍（最高含量达6.5%）和钼（最高含量2.5%），从而开发出了马氏体不锈钢。这种材料在加工制造过程中又采取了特殊的工艺措施，使得新的马氏体不锈钢的焊接性能大大超过了传统的马氏体不锈钢。