Polymer synthesis hardening agent
Synthesis of hardening agent
Executive JB/T4393-2002 Standard
1, summed up:
PVA is a polymer, its aqueous solution as a quenching medium, high
temperature when the cooling rate similar to water, low temperature
is due to the formation of plastic film Ershi working around the
cooling rate greatly reduced, close to the oil cooling rate . However, such media will produce bubbles in the hardening in the
summer perishable stink. Therefore, we have gone through a long-term research trials, has
now made specifically for the quenching of a condensed with
polyvinyl alcohol (also known as synthetic hardening agent)
Second, use:
The concentration of agent used is generally 0.1-0.3%. Temperature was 20 ~ 50 ℃. In the formation of vapor film high-temperature stage of its
cooling rate of 50 ~ 100/ S, between water (100 ~ 200/ S) and oil
(30 ~ 50/ S) between. Steam rupture of membranes with the temperature increase in the
concentration of medium increased slightly. 0.1% concentration is about 500 ℃, and water close. Boiling phase of the maximum cooling rate, with the medium
concentration was increased and the significant drop in the
concentration of 0.1% maximum cooling rate of 450 ~ 500/ S. O.2 concentration is about 350 ~ 400/ S, 0.3% concentration is
about 280 ~ 320/ S. See different kinds of concentration are much smaller than the
maximum cooling rate of water cooling rate (700/ S), which is
greater than the oil (150/ S). In the low temperature (200 ℃) phase of three kinds of
concentration of the slow cooling rate, about 100/ S, well below
the water (350/ S, is greater than the oil (10 ~ 20/ S).
Third, the scope of application
PVA-quenching fire and water solution, suitable for the production
of surface hardening (induction hardening, flame surface hardening,
etc.), and the protection of the atmosphere quenching furnace
heating, etc. to use. Used for carbon steel, alloy steel, not as a salt-bath furnace
heating the workpiece coolant.
4, packaging
Use of external drum, inside the bag and double PVC plastic bags,
each 5Okg.
