Standard No.:	TB/T 1779-1993
English Name:	Technical Specification for Quenching of Turnout Steel Rails
Chinese Name:	道岔钢轨件淬火技术条件
Chinese Classification:	J36    Heat treatment
Professional Classification:	TB    Professional Standard - Railway Transport
Issued by:	Ministry of Railways
Issued on:	1993-4-22
Implemented on:	1993-10-1
Status:	superseded
Superseded by:	TB/T 2344.2-2020 Rails-Part 2: Switch and crossing rails
Superseded on:	2021-7-1
Superseding:	TB 1779-1986
Language:	English
File Format:	PDF
Word Count:	1000 words
Price(USD):	20.00
Delivery:	via email in 1 business day

1 Subject Content and Applicable Scope
This standard specifies the technical requirements, test methods and inspection rules for quenching of rail parts such as switch rail and stock rail of trip switch at turnout, as well as wing rail, point rail and guard rail of frog, etc.
This standard is applicable to the quenching of turnout rail parts.
2 Normative References
GB 226 Etch Test for Macrostructure and Defect of Steels
GB 230 Metallic Materials – Rockwell Hardness Test
YB 28 Metal – Inspection Method of Microstructure
3 Technical Requirements