The heat treatment cycle is designed to obtain a hardness of 25-30.HRC in EN 24 Material where as the regular hardening and tempering of EN24 material results in to higher hardness values. The heat treatment cycle involves oil quenching while harden ing and forced air quenching for tempering....
Heat Treatment Soft annealing °CCoolingHardness HB 650-700slowlymax. 280 Stress-relief annealing °CCooling 630 - 650Furnace 1st pre-heating °C2nd and 3rdHardening °CQuenchingTempering °CHardness after Teperature HRC up to approx. 400 in an air-circulating furnace780 and 10001190 - 1230Salt...
Hardened and tempered 4340 alloy steel can also be nitrided, giving a surface hardness of up to Rc 60. Heat to 500°C – 530°C and hold for sufficient time (from 10 to 60 hours) to develop the depth of case.Nitridingshould be followed by slow cooling (no quench) reducing the problem...
Size mm Tensile,Mpa Yield,Mpa Elongation,% Reduction,% Charpy Impact,J Hardness,HB Φ200 925 740 18 61.5 104/108/118 302-323 Φ280 925 740 18 63.5 106/103/101 286-309 Φ350 905 725 20 64.5 112/110/111 288-312 Φ430 825 650 17.4 54.5 89/105/113 270-275 Φ575 785 590 20 ...
13.steel bar Inspection: Spectral Tested, Microstructure Tested,Hardness Test,Macrostructure Test,UT test14.Our cold drawn factory equipmentsWe adopt advanced production technology and first-class processing equipments, such as heat treatment furnace, straightening machine...
Hardened and tempered 4340 alloy steel can also be nitrided, giving a surface hardness of up to Rc 60. Heat to 500°C – 530°C and hold for sufficient time (from 10 to 60 hours) to develop the depth of case.Nitridingshould be followed by slow cooling (no quench) reducing the problem...
To check the hardenability, the samples were heat treated at 950掳C and withheld for long duration before measuring their hardness in Rockwell hardness tester. Surface texture of the steel specimens after heat treatment was studied under scanning electron microscope....