1、UDC 621.785 : 669.1 DEUTSCHE NORM May 1976 DIN 17014 Heat treatment of ferrous materials Notation to indicate heat treatment processes Part 3 Wrmebehandlung von Eisenwerkstoffen; Kurzangabe von Wrmebehandlungen I 1 Scope and field of application This standard specifies a notation system to indicate
2、the details (e.g. temperature, time) of heat treatment processes. This system is intended to abbreviate the otherwise lengthy description of heat treatment processes, and may be used, for example, in production documentation and in publi- cations. The system is so structured that it is possible to e
3、laborate and clarify heat treatment processes as necessary, an ordi- nary typewriter keyboard being sufficient to print the sym- bols involved. 2 Notation system elements The following details on heat treatment may be given in abbreviated or symbolic form: a) heat treatment equipment; b) heat treatm
4、ent medium; c) rate of heating and cooling: d) heat treatment temperature; e) holding periods; f) intervals between heat treatment steps; g) symbols to indicate subsequent steps; h) other information. 3 Symbols and their meaning 3.1 Slash (1) or arrow (+) A slash shall be used to separate heat treat
5、ment steps, the following step being carried out after a specific duration. An arrow pointing to the right may be used instead of a slash. 3.2 Plus sign (+) A plus sign shall be used to separate heat treatment steps, the following step being carried out after an unspecified duration. It shall also b
6、e used to indicate that ambient tem- perature is to be reached after completion of the preceding step. 3.3 Minus sign (-) A minus sign shall be placed before a temperature that is below zero. Temperatures at or above zero and those given in degrees Kelvin do not require the use of a preceding symbol
7、. 3.4 Parentheses ( ) Parentheses are usually put around whole words used for explanatory purposes and any symbols from other notation systems. Note. Inside parentheses, the slash may be used as a simple divider, and the plus sign to indicate amounts or additions. 4 Indication of temperatures, durat
8、ions and thermal cycles 4.1 Temperatures shall be given in either degrees Celsius (OC) or degrees Kelvin (K). Temperature differences shall be given in K. 4.2 h (hours) or d (days). Durations shall be given in s (seconds), min (minutes), 4.3 Where it is relevant that a certain temperature be held fo
9、r a specific length of time, this duration shall follow the temperature. Unless otherwise stated, times given represent holding times. 4.4 The initial and final temperature of any heat treatment process is usually ambient temperature and need not be given separately for every step. 4.5 Any change in
10、 temperature (e.g. holding, heating or cooling to a certain temperature) shall be given. 4.6 Where the rate at which a temperature change occurs is of relevance, this shall be given in Klh (degrees Kelvin per hour). 5 Examples and explanations of symbols to indicate heat treatment processes 880 OC,
11、30 minloil Heated to 880 OC, held for 30 minutes, quenched in oil, then cooled to ambient temperature (e.g. hardening). Heated to 880 OC, held for 30 minutes, quenched in oil, then cooled to ambient temperature. After an unspeci- fied duration, heated to 55OoC, held one hour, then cooled in air to a
12、mbient temperature (e.g. quenching and tempering). Heated to 880 OC, held for 30 minutes, quenched in oil, cooled in air to ambient temperature, held at ambient temperature for six hours, heated to 550 OC, held for one hour, then cooled in air to ambient temperature. Heated to 880 OC, held for 30 mi
13、nutes, immersed for 20 minutes in a salt bath having a temperature of 2OO0C, then cooled in air to ambient temperature. Heated to 88OoC, held for 30 minutes and, within 30 seconds after the end of the holding period, quenched in oil, then cooled to ambient temperature. After an unspecified duration,
14、 heated to 550 OC, held for one hour, then cooled in air to ambient temperature. 880 OC, 30 minloil + 550 OC, 1 hlair 880 OC, 30 minloillair RT, 6 hl550 OC, 1 hair 880 OC, 30 minlsalt bath: 200 OC, 20 minlair 880 OC, 30 minl(30 s) oil + 550 OC, 1 hlair Continued on page 2 Beuth Verlag GmbH, Berlin.
15、has the exclusive right of sale for German Standards (DIN-Normen). DIN 17 O1 4 Part 3 Engl. Price group Sales No.0104 12.92 Page 2 DIN 17 014 Part 3 880 OC, 30 minlsalt bath: 350 OC, 3 hlair Heated to 88OoC, held for 30 minutes, quenched in a salt bath having a temperature of 350 OC, held there for
16、three hours, then cooled in air to ambient temperature (e.g. austenitizing, transforming to bainite). 880 OC, 30 minloven: 20 Wh, 400 OC1680 OC, 2 hlair Heated to 880 OC, held for 30 minutes, cooled to 400 OC in an oven at a rate of 20 Klh, heated to 680 OC, held for two hours, then cooled in air to
17、 ambient temperature (e.g. austenitizing, transforming to pearlite). Carburizing gas, 930 OC, 4 hlretort oven: 850 OC, 40 minloil: 65 OClair + 180 “C. 30 minlair Heated to 930 OC, with a carburizing gas, held for four hours, cooled to 850 OC in a retort oven and held there for 40 minutes. Quenched i
18、n oil at a temperature of 65 OC, then cooled in air to ambient temperature. After an unspecified duration, heated to 180 OC, held for 30 minutes, then cooled in air to ambient temperature (e.g. case hardening, annealing). Carburizing powder, 930 OC, 4 hlair (box annealing) + 87OoC, 40minlsalt bath:
19、200OClair + 81OoC, 40 min/oil (type XYZ)lair Heated to 930C, with a carburizing powder, held for four hours, then, with the products left in the box, cooled in air to ambient temperature. After an unspec- ified duration, heated to 870OC, held for 40 minutes, quenched in a salt bath having a temperat
20、ure of 200 OC, then cooled in air to ambient temperature. After an unspecified duration, heated to 81OoC, held for 40 minutes, quenched in oil of type XYZ, then cooled in air to ambient temperature (e.g. double hardening). Air, 400 OC, 30 minlsalt bath, 850 OClsalt bath, 1050 OC, 200 slsalt bath, 12
21、20 OC, 200 slsalt bath: 550 OC, 5 minlair + 560 OC, 90 minlair + 560 OC, 90 minlair Heated in air to 4OO0C, held for 30 minutes, further heated in a salt bath to 850 OC, then to 1050 OC, held for 200 seconds, further heated in a salt bath to 122OoC, held for 200 seconds, quenched in a salt bath havi
22、ng a temperature of 55OoC, held for five minutes, then cooled in air to ambient temperature. After an unspeci- fied duration, heated to 560C, held for 90 minutes, then cooled in air to ambient temperature. After an unspecified duration, repetition of the whole process (e.g. multi-step preheating, ha
23、rdening, double annealing of high speed steel). 900C, 20 minlwater spray cooling to 400OCsalt bath: 400 OC, 5 min/air Heated to 900C, held for 20 minutes, cooled with water spray to 400 OC, immersed in a salt bath having a temperature of 4OO0C, held there for five minutes, then cooled in air to ambi
24、ent temperature. Heated to 860 OC, held for 20 minutes, quenched in oil, cooled to -50C, then warmed in air to ambient tem- perature. Furnace: 70 Wh, 700 OC, 4 hlfurnace: 50 Wh, 300 OClair Heated to 700 OC in a furnace at a rate of 70 K/h, held for four hours, cooled to 300 OC in a furnace at a rate of 50 Klh, then cooled in air to ambient temperature. 860 OC, 20 min/oil/- 50 OClair
