High strength low alloy wear resistance steel plate and preparation method thereof
A high-strength, low-alloy, wear-resistant steel plate technology, applied in temperature control and other directions, can solve problems such as the influence of steel plate welding performance, increase steel carbon equivalent, etc., so as to save the intermediate waiting time, shorten the rolling cycle, and improve hardenability. sexual effect
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[0027] Example 1
[0028] The specific chemical composition of the 12mm thick high-strength wear-resistant steel plate of Example 1 is shown in Table 1:
[0029] Table 1 shows the chemical composition of the steel in Example 1 (mass percentage, %)
[0030]
[0031] Vacuum smelt according to the chemical composition of the above ratio and cast into billet.
[0032] The slab is heated to 1180~1200℃, and the heating time is ≥150min.
[0033] The reduction rate of each pass of hot rolling is 15~30%, the cumulative reduction rate is ≥70%, the starting temperature of hot rolling is 1050~1100℃, and the end temperature is ≥950℃.
[0034] Heat treatment (quenching + low temperature tempering) after rolling.
[0035] Quenching system: heating to 950℃, holding time of 36min, water cooling; tempering system: heating to 250℃, holding time of 30min, air cooling.
[0036] After heat treatment, a composite structure of martensite with high hardness, a small amount of retained austenite with good toughness...
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[0040] Example 2
[0041] The specific chemical composition of the 12mm thick high-strength wear-resistant steel plate of Example 2 is shown in Table 3:
[0042] Table 3 shows the chemical composition of the steel in Example 2 (mass percentage, %)
[0043]
[0044] Vacuum smelt according to the chemical composition of the above ratio and cast into billet.
[0045] The slab is heated to 1180~1200℃ for at least 150min;
[0046] The reduction rate of each pass of hot rolling is 15-30%, the cumulative reduction rate is greater than or equal to 70%, the starting temperature of hot rolling is 1050-1100°C, and the end temperature is greater than or equal to 950°C. The steel plate is heat treated after rolling, and tempered at low temperature after quenching.
[0047] Quenching system: heating to 950℃, holding time of 36min, water cooling; tempering system: heating to 250℃, holding time of 30min, air cooling.
[0048] After heat treatment, a composite structure of martensite with high hardness, a...
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