Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries LtdfiledCriticalSumitomo Metal Industries Ltd
Priority to JP1082179ApriorityCriticalpatent/JPS55104424A/en
Publication of JPS55104424ApublicationCriticalpatent/JPS55104424A/en
Heat Treatment Of Strip Materials And Filament Materials
(AREA)
Abstract
PURPOSE: To improve the stress corrosion cracking resistance by heating low carbon steel to the specific temperature range and cooling the same at a cooling rate of 100°C or more in one hour.
CONSTITUTION: The low carbon steel containing C; 0.001W0.07%, Si<0.5%, Mn; 0.40W3.0% and sol. Al<0.10% or further containing one or two or more kinds of Cu; 0.05W0.3%, Cr; 0.05W1.0%, Ni; 0.05W0.60%, Mo; 0.01W0.50% is heated to the temperature range of the AC1 point of said steel +30°C to AC3 point. Ferrite grain boundaries change zigzag, resulting in decreased stress corrosion cracking sensibility. By cooling the later cooling at a cooling rate of 100°C/h or more, spheroidization of the pearlite of the ferrite grain boundaries is prevented and the increase in stress corrosion cracking sensibility is prevented.
COPYRIGHT: (C)1980,JPO&Japio
JP1082179A1979-01-311979-01-31Production of low carbon steel of superior stress corrosion cracking resistance
PendingJPS55104424A
(en)