Heat treatment technology of high-strength bolt
A high-strength bolt and process technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as rapid cooling, deformation and cracking, prevent quenching deformation and cracking tendency, refine grains, Effects of high plasticity and low temperature impact toughness
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[0012] The material specification is M36, and the material composition is shown in Table 2; the heat treatment process is shown in Table 3; the mechanical properties of bolts are shown in Table 4:
[0013] Table 2 Material chemical composition analysis (wt.%)
[0014] the element
C
Si
mn
S
P
Cr
Mo
content
0.41
0.248
0.79
0.004
0.010
0.95
0.15
[0015] Table 3 heat treatment process
[0016] Normalizing process
860℃~880℃ for 60 minutes, air cooling
Quenching process
820℃~830℃ for 50 minutes, water quenching and oil cooling
tempering process
575℃~585℃ for 60 minutes, water cooling
[0017] Table 4 Mechanical properties of bolt samples
[0018]
[0019] The strength grade of the high-strength bolt of the present invention is above grade 10.9, and the mechanical properties meet the requirements in Table 1.
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