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    冷拔无缝钢管硬度检测方法有那些呢

    2018-12-21 10:19:06 无锡盛发地坪科技有限公司 阅读

    冷拔无缝钢管的硬度检测要考虑到它的力学性能,这关系到以冷拔无缝钢管为原料而进行的变形、冲压、切削等加工的性能和质量。因此,所有的冷拔无缝钢管管要进行力学性能测试。力学性能测试方法主要分两类,一类是拉伸试验,一类是硬度试验。?拉伸试验是将冷拔无缝钢管管制成试样,在拉伸试验机上将试样拉至断裂,然后测定一项或几项力学性能,通常仅测定抗拉强度、屈服强度、断后伸长率和断面收缩率。拉伸试验是金属材料最基本的力学性能试验方法,几乎所有的金属材料,只要对力学性能有要求,都规定了拉伸试验。特别是那些形状不便于进行硬度试验的材料,拉伸试验成为唯一的力学性能检测手段。?

    Hardness testing of cold-drawn seamless steel tube should take into account its mechanical properties, which is related to the deformation, stamping, cutting and other processing performance and quality of cold-drawn seamless steel tube. Therefore, all cold-drawn seamless steel tubes should be tested for mechanical properties. There are two kinds of testing methods for mechanical properties, one is tensile test and the other is hardness test. Tensile test is to make cold-drawn seamless steel tube into specimens, pull the specimens to fracture on a tensile testing machine, and then determine one or more mechanical properties, usually only the tensile strength, yield strength, elongation after breaking and section shrinkage. Tensile test is the most basic test method of mechanical properties of metal materials. Almost all metal materials, as long as the mechanical properties are required, have stipulated the tensile test. Especially for those materials whose shape is not easy to carry out hardness test, tensile test becomes the only means of testing mechanical properties. ? 硬度试验是将一个硬质压头按规定条件缓慢压入试样表面、然后测试压痕深度或尺寸,以此确定材料硬度的大小。硬度试验是材料力学性能试验中最简单、最迅速、最易于实施的方法。硬度试验是非破坏性的,材料硬度值与抗拉强度值之间有近似的换算关系。材料的硬度值可以换算成抗拉强度值,这一点具有很大的实用意义。?

    Hardness test is to determine the hardness of the material by slowly pressing a hard indenter into the surface of the sample under specified conditions and then testing the indentation depth or size. Hardness test is the simplest, quickest and easiest method in material mechanical property test. Hardness test is non-destructive, and there is an approximate conversion relationship between hardness and tensile strength. The hardness value of the material can be converted into the tensile strength value, which has great practical significance. ?

    由于拉伸试验不便于测试,并且由硬度换算到强度很方便,因此人们越来越多地只测试材料硬度而较少测试其强度。特别是由于硬度计制造技术的不断进步和推陈出新,一些原来无法直接测试硬度的材料,如冷拔无缝钢管管、冷拔无缝钢管板和冷拔无缝钢管带等,现在都已经可能直接测试硬度了。所以,存在一个硬度试验逐渐代替拉伸试验的趋势。?

    Due to the inconvenience of tensile test and the convenience of conversion from hardness to strength, more and more people only test the hardness of materials and less test their strength. Especially due to the continuous progress and innovation of hardness tester manufacturing technology, some materials that could not directly test hardness, such as cold-drawn seamless steel tube, cold-drawn seamless steel tube sheet and cold-drawn seamless steel tube strip, are now possible to directly test hardness. Therefore, there is a tendency that the hardness test will gradually replace the tensile test. ?

    在冷拔无缝钢管材料的国家标准中大多数都同时规定了拉伸试验和硬度试验。对于那些不便于进行硬度试验的材料,例如冷拔冷拔无缝钢管管就只规定了拉伸试验。在冷拔无缝钢管标准中,一般都规定了布、洛、维三种硬度试验方法,测定HB、HRB(或HRC)和HV硬度值,规定三种硬度值只测其一即可。

    Tensile test and hardness test are stipulated in most of the national standards for cold-drawn seamless steel tube materials. For those materials which are not convenient for hardness testing, such as cold-drawn seamless steel pipe, only tensile test is required. In the standard of cold-drawn seamless steel pipe, three hardness test methods, cloth, lo and vitamin D, are generally stipulated. The hardness values of HB, HRB (or HRC) and HV are determined. It is stipulated that only one of the three hardness values can be measured.



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