Steel for high strength fastener for marine environment
A marine environment, high-strength technology, applied in the field of steel, can solve problems such as the effect is questionable, and achieve the effect of reducing probability and risk
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[0047] The steel grades A1-A3 of the present invention and the comparative steel grade A4 were poured into steel ingots through a 50kg vacuum melting furnace, the chemical composition was as shown above, forged and cut to Φ45mm, and peeled to Φ40mm polished rods for subsequent test samples.
[0048] All steel types in this example are quenched + tempered to obtain the tempered martensite matrix, and the specific heat treatment process is:
[0049] A1: 870°C, water cooling; 550°C, air cooling;
[0050] A2: 900°C, water cooling, 590°C, water cooling;
[0051] A3: 900°C, water cooling, 620°C, water cooling;
[0052] A4: 860°C, water cooling, 500°C, air cooling.
[0053] In addition, the difference in the microstructure obtained in this example is that there is a small amount of reversed austenite structure in steels A1, A2, and A3. It can be seen from the results of mechanical properties that A1 steel has better strength-plastic compatibility, which is due to the increase of s...
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