Some Knowledge Of hollow section

The purpose of metal pipe tempering would be to convert quench martensite into tempered martensite, eliminate recurring austenite, minimize and eliminate inner stress, get high hardness, use weight red and hardness, etc.,

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To support the size and improve aspects Performance,Stainless Material Pipe Tempering Temperature Purposes Articles to meet up their function needs. The standard tempering heat of 540 ~ 570 ° D, in 100% KNC) 3 salt shower padding 1 ~ 1.5h, due to high-speed material tempering martensite rain in the dispersal of small W, Mo and V carbide, recurring Austenite in the III fire method into martensite, so with the "secondary hardening" trend, must certanly be three times the tempering. To be able to ensure the tempering aftereffect of high speed material, should pay attention to these questions:

` Metal pipe quenching must certanly be immediately after the tempering treatment, otherwise it will support the kept austenite, is not conducive to the removal of kept austenite;
a Tempering heat must certanly be standard, it is recommended that the very best in the salt furnace;
b Metal pipe after each and every tempering must certanly be cooled to room heat, in order to hold out the following tempering;
d Metal pipe after the conclusion of the tool must certanly be cooled to room heat to wash, or more likely to trigger cracking of metal tube.

Warm metal tube dry use, do not exceed the limit heat of high temperature metal tube, dry utilization of high temperature metal tube problem won't be great, but this may significantly reduce living of high temperature metal tube, if once the usage of high temperature metal pipe in the middle of the usage of chilling water, will increase living of high temperature metal tube, in order to know in order to ensure high temperature metal tube living and performance, high temperature metal pipe is better not to utilize dry.

Annealing rating demands
1, Metal tube annealing rating can achieve the principles measure.
2, Metal pipe annealing atmosphere.
3, Cover the fuel pressure. Brilliant out from the furnace must certanly be start, and the outside atmosphere cut off; the usage of heavy hydrogen for the protect of the fuel, as long as the exhaust is through (for extinguishing the discharge of heavy hydrogen). The scope of the furnace material can be reviewed if the boring, the very first furnace, the furnace material must certanly be dry; into the furnace metal tube can be a lot of recurring water spots, particularly when the pipe below the hole, then, needless to say, do not water out, set the range atmosphere all destroyed.
4, The furnace seal. You can even have the escape of the furnace inspection hole inspection, annealing part of the metal pipe must certanly be white hot form, but did not display hardening sagging.
5, The furnace water vapor. To be able to stop the emergence of micro-leakage, the furnace protect fuel should maintain a positive stress, if it's heavy hydrogen protecting fuel, the standard demand stainless steel cups

20kBar above. Metal temperature option is typical to take the clear answer temperature option, that's, everybody called "annealing", the rating array of 1040 ~ 1120 (Oman specification). Standard utilization of real hydrogen as the annealing atmosphere, the atmosphere love is better above 99.99%, if the atmosphere is still another in case of inert fuel, then your love can be low and a half, but relative never to include a lot of air, water vapor. The way to review may be used to tow the towel water in the rear of the bones of the bones to see if the work; inside the absolute most simple work the middle of the furnace is back once again to the middle of the pipe and out from the central pipe, a central gasket is specially simple use, to check always frequently change.