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The equation of heat treatment temper of steel
From;    Author:Stand originally

The temper hardness of steel (H) depend on temper temperature (T) with temper time (T) , 3 person between the function with existing particular concerns, namely H = F (T, t) . When T is calm value, the function relation of H and T can differentiate for 4 sort model: (1) linear model; (2) parabola; (3) power function; (4) of function of linear He Mi compound model. Because of hind when two kinds of types are being used, computation and constructive very disadvantageous, below circumstance of reason great majority, its brief melt into is mixed point-blank parabola, with classics proved recipe Cheng Ke expresses to be: H = A2 K2 T of   of   of H = A1 K1 T
Among them, a1, A2, K1, K2 is specific coefficient.
According to practical technology experiment and the data of concerned bibliographical reference, apply several manage statistic to the method is calculated and be amended, the temper equation that reachs commonly used steel plants the part. Carry out a proof, these experience formula have fundamental applicable value.
Steel grade quenchs temperature / quench medium temper equation
45 840/ water H = 62 - (1/9000) T 2
Oily H = 50 - of 20Cr   890/ (2/45) T
Oily H = 64 - of 38CrMoAl   930/ (1/25) T (T<550)
H = 95 - (1/10) T (T>550)
Oily   of 40Cr   850/ H = 75 - (3/40) T
Oily H = 73 - of 50CrVA   850/ (1/14) T
Oily H = 68 - of 60Si2Mn   860/ (1/11250) T 2
Oily H = 74 - of 65Mn   820/ (3/40) T
H = 78- of water of T8   800/ (7/80) T
H = 82.7 - of water of T10   780/ (1/11) T
Oily H = 69 - of CrWMn   830/ (1/25) T
Oily   of 980/ of Cr12   H = 64 - (1/80) T (T<500)
H = 107.5 - (1/10) T (T>500)
Oily H = 65 - of Cr12MoV   1000/ (1/100) T (T<500)
Oily H = 69 - of 9CrSi   865/ (1/30) T
Oily H = 72.5 - of 5CrNiMo   855/ (1/16) T
Oily H = 69 - of 5CrMnMo   855/ (3/50) T
Oily   of W18Cr4V   1280/ H = 93 - (3/31250) T 2
Oily H = 733 - of GCr15   850/ (2/3) T
Service instruction:
(1) composition of chemistry of requirement raw material and mechanical function accord with national technology standard (GB, YB) , the biggest outside classics (or opposite ply) be close to or be less than quench critical diameter.
(2) fall in the condition that quenchs time of temperature, temper is calm value, temper equation applies to convention to quench only, temper craft; Not usable Yuyawen quenchs, the craft such as compound heat treatment, deformation heat treatment.
(3) in heat treatment process, still should choose to quench correctly medium, refrigerative ability satisfies craft requirement; Rolled steel has conditioning treatment by the requirement;
(4) the impact that considers random factor, after rolled steel heat treatment, actual hardness and temperature and computational earning count temper be patient of the error of 5% .