NSSC 550(13Cr-2Ni-2Mo)是新日铁住金独自开发的兼具高硬度和高耐蚀性的马氏体(M)系不锈钢商品。将此钢进行适当淬火和回火处理，可以获得0.2%屈服强度1150N/mm2、抗拉强度1750N/mm2、HV(维氏强度)550的极高强度和硬度，且具有与SUS304钢同等以上的耐蚀性，加之作为线材制品也具备重要的锻压性，故被用作建材中的自动攻丝螺栓、各种高强度销钉和高强度链条等。
High Strength high Rust-Resistant Ferritic Stainless Steel
NSSC 550 is a martensitic grade with remarkably improved quench hardening.
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Superior to SUS 304 in corrosion resistance by appropriate addition of Cr and Mo, as well as by control of trace elements.
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Superior to SUS 304 in its performance of wire drawings as well as cold-heading.
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Applications: Self-tapping screws, High-strength nails, Various kinds of pins, High-strength chains and other applications requiring high hardness and high rust resistance.
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