Clean heat treatment technology for 42CrMo material high-strength bolt
A high-strength bolt and cleaning technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as cracking of quenched workpieces, achieve good hardness uniformity, save resources and costs, and eliminate unsafe factors.
Inactive Publication Date: 2021-02-05
ANHUI HELI CO LTD
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Problems solved by technology
[0005] As we all know, water is a low-cost non-polluting quenching medium, but the cooling characteristics of normal temperature water are easy to crack the quenched workpiece, which limits its application. Therefore, in the prior art, alloy steel is usually quenched with oil or quenching liquid
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[0036] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0037] like Figure 5 As shown, a clean heat treatment process for high-strength bolts made of 42CrMo material includes the following steps:
[0038] S1: Bolt blank heating and heat preservation
[0039] Firstly, the bolt blanks 3 to be processed are placed on the heat-resistant steel material frame 2 with a horizontal porous structure, and then the two heat-resistant steel material frames 2 loaded with the bolt blanks 3 are sent into the trolley furnace. At a high temperature of 840°C, heat preservation treatment is carried out;
[0040] S2: Quenching water tank fills water and heats up
[0041] First, according to the...
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Abstract
The invention discloses a cleaning heat treatment technology for a 42CrMo material high-strength bolt. The cleaning heat treatment technology comprises the following steps that S1, a bolt blank is heated and subjected to heat preservation; S2, water is injected into a quenching water tank for heating; S3, a bolt blank quenching process is controlled; S3.1, a cooling process is controlled; S3.2, the tempering process is controlled; and S4, testing qualification of quenched workpiece is conducted. According to the clean heat treatment technology for the 42CrMo material high-strength bolt, a water cooling heat treatment technology is adopted, the high-strength bolt made of 42CrMo alloy steel is quenched and tempered, and the cooling time of the quenched workpiece in water is strictly controlled by using a special quenching water tank and a heat-resistant steel material frame, the rapid cooling of the quenched workpiece in an initial cooling stage is realized by controlling the weight ratio of water to the quenched workpiece and the initial temperature of the water, and the slow cooling of the quenched workpiece in a low-temperature stage is realized by virtue of the rise of water temperature, so that the internal and external hardness uniformity of the quenched workpiece is good, the hardness is HRC33-34, the mechanical property meets the requirements of 10.9-grade high-strength bolts, the heat treatment quality is stable, meanwhile, the production field is clean and the environmental protection requirement is met.
Description
technical field [0001] The invention belongs to the technical field of metal material heat treatment, in particular to a clean heat treatment process for high-strength bolts made of 42CrMo material. Background technique [0002] The high-strength bolts used in cement mechanical vertical mills require a grade of 10.9, and the mechanical performance indicators are required to reach: tensile strength ≧ 1000MPa, yield ratio 0.9, and yield strength ≧ 900MPa. [0003] Made of 42CrMo material, the size of the blank is Φ52*890, the blank requires quenching and tempering heat treatment (quenching + high temperature tempering), and the hardness requirement reaches HRC30-34. [0004] 42CrMo material, because of its good hardenability, is easy to crack or deform during quenching, so oil or quenching liquid has been widely used in industrial production for cooling and quenching. However, oil quenching not only increases the cost, but also produces oil fume, causes environmental pollutio...
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IPC IPC(8): C21D1/18C21D9/00C21D11/00C21D1/60C21D1/63
CPCC21D1/18C21D9/0093C21D11/00C21D11/005C21D1/60C21D1/63
Inventor 肖结良汪大新李飞胡平陈旌钢
Owner ANHUI HELI CO LTD