High-strength bolt excellent in delayed fracture resistance characteristics and its steel product
A high-strength bolt and high-strength technology, applied in the direction of bolts, screws, nuts, etc., can solve the problems of delayed fracture of bolts that cannot reach the strength
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[0084] Use the steel for the test with the chemical composition shown in the following table 1, hot-roll it into a wire rod with a wire diameter of Ф21.5mm, use the various wire rods obtained, and make the threaded part M22 (JIS metric standard bolt of F10T) There are two types of bolts in the conventional shape and the shape of the present invention. Then, through quenching and tempering, the tensile strength of the bolt is 1200N / mm 2 ~1700N / mm 2 Adjust within the range. At this time, the tensile strength is adjusted by the composition and tempering temperature, and the tempering temperature is in the range of 290°C to 700°C. Table 2 shows the tempering temperature and tensile strength at this time.
[0085]
Steel for test
Chemical composition (mass%)
C eq
C
Si
mn
P
S
Cr
Mo
Al
V
Ni
Ti
Nb
1
2
3
4
5
6
7
8
9 ...
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