60Si2Mn are spring steel, suitable for production of automobile leaf spring. 60Si2Mn spring steel heat treatment and classification of isothermal quenching tempering, quenching and tempering temperature and Asia, thermomechanical treatment process method. Using this method can effectively improve the toughness of steel 60Si2Mn spring and life.

60Si2Mn heat treatment process:


Spheroidizing: The 850-degree heat, cold oil quenching, isothermal ball short process (790-degree heat 25Min, quench heat to 680 degrees 1H, furnace cooling to 500 degrees baked), get good ball of the organization. 60Si2Mn steel quenching temperature the normal 850 degrees to 870 degrees to take the oil cooling. Tempering temperature requirements as the hardness of the mold and take part, such as


400 degree tempered, hardness 46HRC;


500 degree tempered, hardness 40HRC;


600 degree of tempering, hardness 34HRC.


150 to 160 degrees tempered with the best performance, attention must be about 300 degrees to avoid temper embrittlement zone. Demands for higher toughness of tool and die, good dimensional stability required measuring and tempering temperature can be increased to 250 degrees, hardness of 55 ~ 60HRC, has good toughness.


AC1-755, Ac3 = 810, Ar1 = 700, Ar3 = 770, Ms-300 ~ 305,


Annealing; 750C-furnace cold-HBS ≤ 222


Normalizing; 830 ~ 860C-cooled-HBS ≤ 302


Quenching; 870C-oil-HRC> 61


Temperature hardness after tempering HRC: 150C-61, 200C-60, 300C-56, 400C-51, 500C-43, 550C-38, 600C-33, 650C-29


Commonly used tempering temperature 430 ~ 480C, water or air, HRC45 ~ 50


The following are the parameters of car leaf spring heat


Quenching time and the thickness of insulation: mm / min, 6.5 / 2,8 / 3,8.5-10 / 4,12 / 5


Tempering holding time and thickness: mm / min, <10/25-30 ,10-15 / 30-35,15-20 / 40-45,20-25 / 45-50.


● 60Si2Mn density 7.85g/cm3. 60Si2Mn is widely used silicon-manganese spring steel, strength, flexibility and higher hardenability than 55Si2Mn. For railway vehicles, automobile and tractor industry to bear a greater load on the production of flat spring 30mm or less in diameter coil spring


● 60Si2Mn standard heat treatment: quenching 870 ℃ ± 20 ℃, oil cooling; tempering 480 ℃ ± 50 ℃ (special needs, ± 30 ℃).
Chemical composition:


Carbon C: 0.56 ~ 0.6


Si Si: 1.50 ~ 2.00


Manganese Mn: 0.60 ~ 0.90


Sulfur S: ≤ 0.035


Phosphorus P: ≤ 0.035


Chromium Cr: ≤ 0.35


Ni-Ni: ≤ 0.35


Copper Cu: ≤ 0.25