High-strength steel plate containing rare earth (RE) and heat treatment process thereof
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A high-strength steel plate and rare earth technology, which is used in the field of austenitizing, quenching and tempering of steel plates, and can solve the problems of complicated operation process and so on.
Inactive Publication Date: 2011-11-02
INNER MONGOLIA BAOTOU STEEL UNION
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Of course, the C-Si-Mn-B series Mo-free bainite steel plate can also obtain excellent properties with a strength of more than 1500 MPa through heat treatment, but the heat treatment process includes three stages of austenitization, isothermal treatment and tempering, and the operation process is relatively complicated.
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Embodiment 1
[0013] The chemical composition content (percentage by weight) of the steel plate is: C 0.24%, Mn 1.72%, Si 0.73%, P 0.0115%, S 0.002%, Ti 0.03%, B 0.0007%, Ce 0.008%, the balance is Fe and unavoidable of impurities.
[0014] The thickness of the steel plate is 8mm, and the heat treatment process system is as follows: austenitizing temperature 910°C, water quenching after holding time for 44 minutes, low temperature tempering at 200°C, holding for 5 hours, and air cooling. Sampling test, its mechanical property test value is shown in Table 1:
[0015] Table 1 Mechanical property detection value
[0016]
Embodiment 2
[0018] The chemical composition content (percentage by weight) of the steel plate is: C 0.24%, Mn 1.74%, Si 0.71%, P 0.0114%, S 0.002%, Ti 0.034%, B 0.0011%, Ce 0.08%, the balance is Fe and unavoidable of impurities.
[0019] The thickness of the steel plate is 8mm, and the heat treatment process system is as follows: austenitization temperature 920°C, water quenching after holding time for 44 minutes, low temperature tempering at 200°C, holding time for 5 hours, and air cooling. Sampling test, its mechanical property test value is shown in Table 2:
[0020] Table 2 Mechanical property detection value
[0021]
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Abstract
The invention provides a high-strength steel plate containing rare earth (RE) and a heat treatment process thereof, and belongs to the metallurgical technical field. The RE-containing high-strength heat-treated steel plate comprises the following chemical components by weight percentage: 0.15%-0.25% of C, 1.5%-1.85% of Mn, 0.7%-1.0% of Si, not more than 0.015% of P, not more than 0.003% of S, 0.01%-0.06% of Ti, 0.0005%-0.035% of B, 0.001%-0.09% of RE and the balance of Fe and unavoidable impurities. The heat treatment process comprises the following steps: austenitizing at the temperature of 900-950 DEG C, keeping the temperature for 0.5-2.5 hours and then performing water quenching; and tempering at the temperature of 190-240 DEG C and then keeping the temperature for 1-10 hours. The heat-treated steel plate produced by the heat treatment process has the advantages of excellent mechanical properties and low production cost, wherein, the tensile strength reaches 1500-1700MPa, the elongation is 10-15% and the yield ratio is not more than 0.9; and the heat treatment process is applicable to industrial production of the steel plate with the thickness of 5-25mm.
Description
1. Technical field [0001] The invention discloses a rare earth-containing high-strength steel plate and a heat treatment process thereof, which belong to the technical field of metallurgy, relate to the field of thermal processing of materials, and particularly relate to austenitization, quenching and tempering processes of steel plates. 2. Background technology [0002] High-strength steel plates are widely used in industries such as automotive, military and construction. Most high-strength steel plates are obtained through heat treatment processes, such as the 4340 armor steel specified in ASTM A29 / A29M-04, which is the earliest low-alloy high-strength steel, chemical composition by weight percentage: C 0.38% ~ 0.43%, Si 0.15 %~0.35%, Mn 0.60%~0.90%, S≤0.040%, P≤0.035%, Cr 0.60%~0.90%, Ni 1.65%~2.00%, Cu≤0.025%, Mo 0.20%~0.30%. Tempering at 600°C after oil quenching at 850°C can obtain tensile strength R m ≥980MPa, yield strength R 0.2 ≥835MPa, elongation δ 5 (%) ≥ 12 ...
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