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NM450耐磨板的生产安装应该注意哪些步骤?

所属分类:常见问题 发布时间:2021-05-28 来源:https://www.lcnaimoban.com/ 浏览量:

NM450耐磨板工程项目安裝是大家普遍的一种管件,在应用全过程中,为提升它的性能测试方案,可历经一系列加工工艺实际效果开展解决,而热处理工艺完后,必须对NM450耐磨板工程项目安裝开展制冷,制冷对它的应用是十分关键的,假如某一阶段的加工工艺挑选不正确,会导致材料品质的难题,因此我们在开展制冷时必须留意下列几问题。
Nm450 wear-resistant plate project installation is a common kind of pipe fittings. In the whole process of application, in order to improve its performance test scheme, it can be solved through a series of actual processing effects. After the completion of heat treatment process, it is necessary to carry out refrigeration for nm450 wear-resistant plate project installation, If a certain stage of processing technology selection is not correct, it will lead to material quality problems, so we must pay attention to the following problems when carrying out refrigeration.
1、NM450耐磨板工程项目安裝的低温马氏体十分的平稳,具备很高的切削性能,即便 空冷也可以获得奥氏体机构,但风冷则会导致无缝钢管表层的空气氧化,并有可能溶解匀晶渗碳体,因而尽量的不选用空冷。
1. The low-temperature martensite installed in nm450 wear-resistant plate project is very stable and has high cutting performance. Even air cooling can obtain austenite structure, but air cooling will cause air oxidation on the surface of seamless steel pipe and may dissolve homogeneous cementite, so air cooling is not selected as far as possible.
2、针对很大和繁杂的NM450耐磨板工程项目安裝为降低形变和裂开,在热处理时可开展急冷解决,但应控制时间,一般依据NM450耐磨板工程项目安裝的样子等操纵在几秒钟到几十秒,前提条件是不可以溶解二次渗碳体而减少无缝钢管的强度和红强制等,此外不允许造成浸蚀黑点等。
NM450耐磨板
2. For large and complicated nm450 wear-resistant plate project installation, in order to reduce deformation and cracking, rapid cooling can be carried out during heat treatment, but the time should be controlled. Generally, according to the installation appearance of nm450 wear-resistant plate project, it should be controlled within a few seconds to dozens of seconds, provided that the strength and red force of seamless steel pipe can not be reduced by dissolving secondary cementite, In addition, etching black spots are not allowed.
3、分级淬火溫度应不超过750°C,以避免 产生铁素体的变化和溶解渗碳体。
3. The step quenching temperature shall not exceed 750 ℃ ° C. In order to avoid the change of ferrite and the dissolution of cementite.
4、充分考虑下马氏体的变化溫度为620~450℃,其变化快的溫度在260~30C℃,因而生产制造中选用260~280℃等温过程2~4h。因为等温过程热处理后的残留马氏体溫度较多并且平稳,故应开展4次淬火。
4. Fully considering that the change temperature of martensite is 620 ~ 450 ℃, and its fast change temperature is 260 ~ 30C ℃, so the isothermal process of 260 ~ 280 ℃ is selected for 2 ~ 4H. Because the temperature of residual martensite after isothermal heat treatment is more and more stable, four quenching should be carried out.
5、高溫分级淬火应在580~620°C的中性盐浴中开展,不适合选用500~550℃的硝盐开展等级分类制冷,其缘故取决于硝盐会对炙热的NM450耐磨板工程项目安裝造成空气氧化和浸蚀,乃至将无缝钢管的端角烧蚀。
5. High temperature graded quenching should be carried out between 580 and 620 ℃ ° It is not suitable to use 500 ~ 550 ℃ nitrate to carry out classified refrigeration. The reason is that the nitrate will cause air oxidation and erosion to the hot nm450 wear-resistant plate project installation, and even the end corner of seamless steel pipe will be ablated.
6、热处理实际操作时要竖直放进制冷物质中,以降低形变。
6. In order to reduce the deformation, the heat treatment should be put into the cold material vertically.
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