Marquenching is a steel hardening process to produce finished products of high precision and quality from relatively less expensive low alloy steels. The finished products include gears, tools dies, bearing races, etc. The process of marquenching essentially consists of rapid hot quenching of the finished products in baths maintained at about 200 °C to ensure temperature equalization throughout the steel before conversion to the martensite structure during subsequent air or water cooling.
2
This second revision has been carried out to incorporate the following major changes:
a) The oil suitable for marquenching should have a high and constant quench rate along with satisfactory steel hardening characteristics. Hence, a performance test based on a Quenchometer with Cooling Curve analysis has been included in the requirements. It should have high flash point and low volatility to minimize fire hazards.
b) Globally, marquenching oils are specified and marketed on the basis of the kinematic viscosity at 40 °C. Additionally, viscosity index of a quenching oil is directly related to its performance, affecting its behaviour over varying temperatures. The base oils commonly used in the manufacture of quenching oils inherently have a sufficiently high viscosity index. Hence, the viscosity and viscosity index requirements of marquenching oils have been revised to reflect the representative viscosity.
Timeline Details
S.No.
P-Draft
Completion Date
WC-Draft
Completion Date
Final-Draft
Completion Date
Project
Completion Date(Gazette)
Entered By
Entered On
1
04-11-2024
04-04-2025
19-06-2025
03-11-2025
MS. KREETI DAS
04-11-2024
No records found.
Stages
Sl.
No.
Stage
Date of Occurence
Remarks
Circulated to
Files
1
Generation of Document Number
04-11-2024
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2
P-Draft Waived
04-11-2024
As this is a revision, P draft is being waived off
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3
WC Draft
04-11-2024
Duration : 60 Days Submitted for HOD approval Remarks : WC draft attached