冷拔無縫鋼管硬度檢測方法有那些呢

冷拔無縫鋼管的硬度檢測要考慮到它的力學性能，這關系到以冷拔無縫鋼管為原料而進行的變形、沖壓、切削等加工的性能和質量。因此，所有的冷拔無縫鋼管管要進行力學性能測試。力學性能測試方法主要分兩類，一類是拉伸試驗，一類是硬度試驗。?拉伸試驗是將冷拔無縫鋼管管制成試樣，在拉伸試驗機上將試樣拉至斷裂，然後測定一項或幾項力學性能，通常僅測定抗拉強度、屈服強度、斷後伸長率和斷面收縮率。拉伸試驗是金屬材料最基本的力學性能試驗方法，幾乎所有的金屬材料，隻要對力學性能有要求，都規定瞭拉伸試驗。特別是那些形狀不便於進行硬度試驗的材料，拉伸試驗成為唯一的力學性能檢測手段。?
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. ? 硬度試驗是將一個硬質壓頭按規定條件緩慢壓入試樣表面、然後測試壓痕深度或尺寸，以此確定材料硬度的大小。硬度試驗是材料力學性能試驗中最簡單、最迅速、最易於實施的方法。硬度試驗是非破壞性的，材料硬度值與抗拉強度值之間有近似的換算關系。材料的硬度值可以換算成抗拉強度值，這一點具有很大的實用意義。?
Hardness test is to determine the hardness of the material by slowly pressing a hard indenter into the surface of 环氧地坪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. ?
由於拉伸試驗不便於測試，並且由硬度換算到強度很方便，因此人們越來越多地隻測試材料硬度而較少測試其強度。特別是由於硬度計制造技術的不斷進步和推陳出新，一些原來無法直接測試硬度的材料，如冷拔無縫鋼管管、冷拔無縫鋼管板和冷拔無縫鋼管帶等，現在都已經可能直接測試硬度瞭。所以，存在一個硬度試驗逐漸代替拉伸試驗的趨勢。?
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. ?
在冷拔無縫鋼管材料的國傢標準中大多數都同時規定瞭拉伸試驗和硬度試驗。對於那些不便於進行硬度試驗的材料，例如冷拔冷拔無縫鋼管管就隻規定瞭拉伸試驗。在冷拔無縫鋼管標準中，一般都規定瞭佈、洛、維三種硬度試驗方法，測定HB、HRB（或HRC）和HV硬度值，規定三種硬度值隻測其一即可。
Tensile test and hardness test are stipulated in most of the national standard透水地坪s 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.