The chemical composition design

steel purity improving

the heat treatment process and precipitates analysis of the The mechanical engineering of TQ960E microalloyed high strentth low carbon steel were studied. The results indicate that for the 12 mm hot-rolled plate of steel TQ960E (/% ：0. 18C

0. 23Si

1.50Mn

0. 010P

0. 003S

0.06Ti

0.002B

0.006 3N

0. 001 30) the optimum quenching temperature is 860 〜900 °C. and the tempering temperature is 300 〜350°C.The steel plates were developed and produced by industrialization

with the yield strength no less than 1 000 MPa

the tensile strength above 100 MPa

the elongation above 10% or higher and the Charpy impact energy at -40°C no less than 34 J. The steel can meet domestic standard and application requirements of high strength steel for engineering machinery.