Preparation method of high-strength steel and high-strength steel
A technology of high-strength steel and alloy steel, which is applied in the field of high-strength steel and can solve problems such as vacancies in heat treatment methods
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[0021] see figure 1 , the preparation method of the high-strength steel of an embodiment, comprises the following steps:
[0022] Step S100: heating the alloy steel to 600-650°C and keeping it warm for 90-180 minutes, then heating to 820-870°C and keeping it warm for 120-240 minutes to obtain an austenitized alloy steel, wherein the alloy steel is In terms of mass percentage, it includes 0.25% to 0.55% of carbon (C), 0.17% to 0.37% of silicon (Si), 0.40% to 1.50% of manganese (Mn), and 0.60% to 1.20% of chromium (Cr) , 0.15% to 0.30% molybdenum (Mo), the rest is iron (Fe) and unavoidable impurities, and the sum of the percentages of each component is 100%.
[0023] Preferably, the alloy steel further includes 0.04%-0.50% titanium (Ti) or vanadium (V).
[0024] In particular, the alloy steel is cylindrical, with a diameter of D, where 0<D≤160mm. Specifically, the alloy steel is an anchor rod, and the preparation method of the high-strength steel solves the problem of heat tr...
Embodiment 1
[0038] The alloy steel is made of 35CrMo anchor rod, which includes 0.32% to 0.40% of C, 0.17% to 0.37% of Si, 0.40% to 0.70% of Mn, and 0.80% to 1.10% of Cr in terms of mass percentage. 0.80% to 1.10% Mo. The diameter of alloy steel is 30mm.
[0039] Heating the alloy steel to 600°C with a heating rate of 100°C / h and holding it for 90 minutes, then heating it to 840°C at a heating rate of 80°C / h and holding it for 120 minutes to obtain an austenitized alloy steel; The alloy steel of martensitization is quenched in the PAG quenching liquid that volume concentration is 6%, obtains the alloy steel of martensitization, the temperature of the alloy steel of martensitization after quenching is 70 ℃; The alloy of martensitization The steel is heated to 560°C with a heating rate of 60°C / h, and kept for 180 minutes, then water-cooled to 350°C, and then air-cooled to room temperature to obtain high-strength steel.
[0040] After heat treatment, the mechanical test is carried out accord...
Embodiment 2
[0042] The alloy steel is made of 42CrMo anchor rod, which includes 0.38% to 0.45% of C, 0.17% to 0.37% of Si, 0.50% to 0.80% of Mn, and 0.90% to 1.20% of Cr in terms of mass percentage. 0.15% to 0.25% Mo. The diameter of alloy steel is 70mm.
[0043] Heating the alloy steel to 600°C with a heating rate of 70°C / h and holding it for 120 minutes, then heating it to 850°C at a heating rate of 100°C / h and holding it for 140 minutes to obtain an austenitized alloy steel; The austenitized alloy steel is quenched in a PAG quenching solution with a volume concentration of 8%, to obtain a martensitized alloy steel, and the temperature of the martensitized alloy steel after quenching is 50°C; the martensitized The alloy steel is heated to 560°C, the heating rate is 70°C / h, and kept for 210 minutes, and high-strength steel is obtained after cooling.
[0044] After heat treatment, the mechanical test is carried out according to GB / T228.1, the anchor rod with a diameter of 70mm, the yiel...
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