公开(公告)号：US4021272A

公开(公告)日：1977-05-03

申请号：US568197

申请日：1975-04-15

Applicant: Yoshiteru Asai ,  Sumio Yoshizoe

Inventor： Yoshiteru Asai ,  Sumio Yoshizoe

IPC: C22C38/00 ,  B26B21/58 ,  C21D1/26 ,  C21D1/46 ,  C21D6/00 ,  C21D9/18 ,  C21D9/46 ,  C21D9/52 ,  C21D1/48

CPC classification number: C21D1/46 ,  C21D9/52

Abstract: A method consisting in converting a coil of hot-rolled band steel for tools and razor blades into an open coil in which its convolutions are spaced apart from one another, and immersing the open coil in a series of salt baths. First of all, the open coil is immersed for 5 to 30 minutes in a salt bath held at a temperature in a range from 550.degree. to 750.degree. C. to preheat the open coil and cause preliminary precipitation of carbides. The preheated open coil is immersed for 5 to 30 minutes in a salt bath held at a temperature in a range from the temperature immediately above Acl point to the temperature of Acl point plus 50.degree. C. to make the band steel austenitic in structure. The open coil is then immersed for over 10 minutes in a salt bath held at a temperature in a range from the temperature immediately below Arl point to the temperature of Arl point minus 80.degree. C. so that the isothermal transformation may be completed. Finally, the open coil is immersed for 3 to 10 minutes in a salt bath held at a temperature in a range from 600.degree. to 650.degree. C. and air cooled thereafter. The method enables to produce band steels for tools and razor blades which contain carbides occurring in a small spheroidal structure of uniform size, have good cold-workability, have freedom from decarburizing and carburizing, and have high amenability to hardening.

Abstract translation: 一种将用于工具和剃刀刀片的热轧带钢线圈转换成卷绕彼此间隔开的开放线圈，并将开放线圈浸入一系列盐浴中的方法。 首先，将开放的线圈浸入保持在550℃至750℃的温度的盐浴中浸泡5至30分钟，以预热开放的线圈并引起碳化物的初步沉淀。 将预热的开放线圈在保持在Acl点附近的温度到Acl点加上50℃的温度范围内的盐浴中浸渍5至30分钟，以使结构中的奥氏体钢带形成。 然后将开放的线圈浸入保持在Arl点以下的温度至Ar1点的温度为零下80℃的温度范围内的盐浴中浸渍10分钟以上，从而可以完成等温转变。 最后，在保持在600〜650℃的温度的盐浴中浸泡3〜10分钟，然后空气冷却。 该方法能够生产用于具有均匀尺寸的小球形结构中存在的碳化物的工具和剃刀刀片的带钢，具有良好的冷加工性，不会脱碳和渗碳，并且具有高的硬化适应性。