carburizing furnace

carburizing furnacecarburizing furnace is a case-hardening process in which carbon is dissolved in the surface layers of a low-carbonpit carburizing gas furnacesteel part at a temperature sufficient to render the steel austenitic, followed by quenching and tempering to form a martensitic microstructure. the resulting gradient in carbon content below the surface of the part causes a gradient in hardness, producing a strong, wear-resistant surface layer on a material, usually low-carbon steel, which is readily fabricated into parts.

carburizing furnacein gas carburizing, commercially the most important variant of carburizing, the source of carbon is a carbon-rich furnace atmosphere produced either from gaseous hydrocarbons, for example, methane (ch4), propane (c3h3), and butane (c4h10), or from vaporized hydrocarbon liquids.

carburizing furnacecarbon sources low-carbon steel parts exposed to carbon-rich atmospheres derived from a wide variety of sources will carburize at temperatures of 850°c (1560°f) and above.

carburizing furnacein the most primitive form of this process, the carbon source is so rich that the solubility limit of carbon in austenite is reached at the surface of the steel and some carbides may form at the surface. such atmospheres will also deposit soot on surfaces within the furnace, including the parts. while this mode of carburizing is still practiced in parts of the world in which resources are limited, the goal of current practice in modern manufacturing plants is to control the carbon content of furnace atmospheres so that:

endothermic gas (endogas) is a blend of carbon monoxide, hydrogen, and nitrogecarbonitriding process distributed computer control systemn(with smaller amounts ofcarbondioxide water vapor, and methane) produced by reacting a hydrocarbon gas such as natural, gas (primarily methane), propane or butane with air. for endogas produced from pure methane, the air-to-methane ratio is about 2.5; for endogas produced from pure propane, the air-to-propane ratio is about 7.5. these ratios will change depending on the composition of the hydrocarbon feed gases and the water vapor content of theambient air.

carburizing furnacea carrier gas similar in composition to endogas produced from methane can be formed from a nitrogen-methanol blend. the proportions of nitrogen and methanol (ch3oh) are usually chosen to give the same nitrogen-to-oxygen ratio as that of air, that is, about 1.9 volumes of nitrogen for each volume of gaseous methanol.

pit carburizing gas furnace specifications:
name unit pit carburizing furnace(type)
rq3-25-9 rq3-35-9 rq3-60-9 rq3-75-9 rq3-90-9 rq3-105-9
rated power kw 25 35 35 75 90 105
rated voltage v 380 380 380 380 380 380
frequency hz 50 50 50 50 50 50
phase   3 3 3 3 3 3
connection methods   y y y,y y,y y,yy y,yy
rated temperature 950 950 950 950 950 950
loading basket size diameter mm 300 300 450 450 600 300
depth mm 450 600 600 900 900 1200
furnace and air power loss mw ≤7 ≤8 ≤11 ≤14 ≤16 ≤18
the biggest load mg 50 100 150 220 400 500
furnace heating and air time
h ≤2.5 ≤2.5 ≤2.5 ≤2.5 ≤3 ≤3
furnace out dimension l mm 1620 1620 1750 1750 1700 1700
w mm 1500 1500 1436 1436 1580 1580
h mm 2000 2200 2265 2265 2750 2990
weight kg ~1740 ~1910 ~2600 ~2960 ~3700 ~4000
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