A rare-earth low-temperature-resistant high-strength bolt steel and its preparation method
A high-strength bolt and low-temperature-resistant technology, applied in the field of smelting and rolling, can solve the problems of difficult production technology, poor steel surface quality, and high manufacturing cost of 42CrNi2Mo steel, achieving good promotion value, improving low-temperature performance, and good economic benefits. Effect
Active Publication Date: 2021-06-22
BAOTOU IRON & STEEL GRP
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Problems solved by technology
In recent years, some domestic wind power manufacturers have used 42CrNi2Mo steel to make high-strength bolts, but the production technology of this steel is very difficult. First, the impact performance of large-scale steel is unstable. Second, because 42CrNi2Mo steel contains high Ni and Cr elements, It is difficult to descale the surface of the billet, and the surface quality of the rolled steel is poor. Third, the manufacturing cost of 42CrNi2Mo steel is relatively high
Method used
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Embodiment Construction
[0018] The pilot test preparation process of steel grades is: 25kg vacuum induction furnace smelting - casting steel ingot - electric induction heating furnace heating steel ingot - Ф550mm hot rolling experimental unit rolling - slow cooling - sample heat treatment - composition and performance inspection.
[0019] 1. Vacuum smelting
[0020] A 25kg vacuum induction furnace was used to smelt 2 furnaces of experimental steel, one of which was added with a rare earth alloy, and a comparative experiment was carried out. The chemical composition of the experimental steel is shown in Table 1.
[0021] Table 1 Composition of finished products (%)
[0022] C Si mn P S Cr Mo Ni RE(Ce) 1# 0.404 0.274 1.05 0.0202 0.012 1.01 0.193 0.212 —— 2# 0.445 0.285 1.06 0.0193 0.012 0.996 0.190 0.207 0.019
[0023] 2. Heating and rolling process
[0024] Two batches of 25kg steel ingots were heated by a box-type heating furnace. The heating tem...
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The invention discloses a rare-earth low-temperature-resistant high-strength bolt steel, which comprises the following chemical components in mass percentage: C: 0.38-0.45%, Si: 0.17-0.35%, Mn: 0.80-1.15%, Cr: 0.90-1.20 %, Mo: 0.15~0.25%, Ni: 0.1~0.3%, RE: 0.01~0.03%, P≤0.025%, S≤0.025%, others are Fe and unavoidable impurities, and its preparation method is also announced. The rare-earth low-temperature-resistant high-strength bolt steel of the invention not only has low production cost and good economic benefits, but also has improved low-temperature impact toughness and meets standard requirements.
Description
technical field [0001] The invention relates to the field of smelting and rolling, in particular to a rare earth low-temperature-resistant high-strength bolt steel and a preparation method thereof. Background technique [0002] High-strength bolts are crucial connectors in the installation and overall connection of large equipment and units. The quality and performance of bolts directly affect the bearing capacity and service life of the overall structure of equipment and units. Various industries have different requirements for bolts, including different comprehensive mechanical properties, such as high strength, high strength at high temperature, and prevention of steel brittle fracture at low temperature. Steel for low temperature resistant high strength bolts requires high strength and good low temperature brittleness resistance. At present, high-strength low-temperature resistant bolts are widely used in the wind power industry. A large number of high-strength bolts a...
Claims
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IPC IPC(8): C22C38/44C22C38/42C22C38/04C22C38/02C22C33/04C21D8/02C21D1/18
CPCC21D1/18C21D8/0205C21D8/0247C22C33/04C22C38/002C22C38/005C22C38/02C22C38/04C22C38/42C22C38/44Y02P10/20
Inventor 谭晓东赵晓敏白月琴周彦
Owner BAOTOU IRON & STEEL GRP