In india we called chisel as a chorsi .
chorsi is very important tools for wood working .
without chisel wood working is not done ..
chisel is essential for all carpenters
The Chrome Manganese (Cr-Mn) steel used in Narex chisels is a low-alloy high-carbon steel developed specifically for making edge tools using the isothermal hardening method Narex chisel
High carbon tool steel is usually hardened by quenching in water or oil at ambient temperature. This thermal shock triggers a transformation from the uniform solid solution of iron and carbon known as austenite to a very fine crystalline structure called martensite. Most of the martensite formation occurs after the quench as the steel cools back down to room temperature. Martensite is a superfine, very hard but also very brittle structure, so the steel needs to be heated again at a lower temperature in a process called tempering which converts the martensite into a much stronger, very fine two-component (ferrite and cementite) structure. This process was the first method of hardening steel and is still by far the most common
Air hardening tool steels don’t need a thermal shock, but they do need to be cooled to well below ambient temperature in order for the austenite to convert, this is known as cryogenic hardening. When air hardening steels are tempered they don’t convert fully, the process produces a ferrite/cementite structure but also more martensite. Repeating the tempering process converts a proportion of the remaining martensite each time so the overall percentage of ferrite/cementite increases with each tempering. This is why you will sometimes hear these steels described as ‘double tempered’ or ‘triple tempered’. Another characteristic of air quenched steels is that they cannot be differentially hardened.
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For Buying This Machine
satish Kumar Chandan (whatsapps No ) - +919312267811
0-200,Sector -1 DSIIDC INDUSTRIAL PARK
BAWANA INDUSTRIAL AREA , DELHI -110039(INDIA)
Tel - +918468851101/02
Website - www.mvstools.com
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Isothermal hardening differs from both of these methods in that there is no separate tempering stage. The steel goes straight from austenite to bainite (a ferrite / cementite structure similar to tempered martensite) without going through a martensitic stage first. The steel is hot quenched in a bath of molten salt at 200 degrees C, left to soak at this temperature until the crystalline structure is fully formed and then cooled back to room temperature in a water shower. This is a very gentle and accurate hardening technique, so the results are consistent and produce a fine, uniform grain structure with virtually no deformation
Features & details
6 piece set comes on a wooden presentation box
Blades are made from fine-grained, nicely tempered chrome-manganese steel and hardened to Rc 59
Contains the following sizes: 6, 10, 12, 16, 20 and 26 mm
Bevel ground at a 25 degree bevel.
Handles are made from stained European Beech
Product information
Manufacturer Narex
Item model number FBA_853053
Package Dimensions 32.8 x 25 x 4.4 cm; 1.6 Kilograms
Topic cover in this video
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1)Wood working bench making
• WoodWorking Bench Making
DISCLAIMER:
Woodworking and the use of power and hand tools can be extremely dangerous. You are responsible for understanding the safe use of your tools and techniques. Your safety is YOUR responsibility, I accept NO responsibility or liability for any injuries, accidents, death occurring to you or others if you attempt to do the things that I do or use advice that I give.
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