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                螺旋鋼管的主要硬度指標:維氏硬度法可用于測定很薄的金屬材料和表面層硬度.它具有布氏,洛氏法的主要優(yōu)點(diǎn),而克服了它們的基本缺點(diǎn),但不如洛氏法簡(jiǎn)便.維氏法在鋼管標準中很少用.在鋼管標準中,布氏硬度用途最廣,往往以壓痕直徑d來(lái)表示該材料的硬度,既直觀(guān),又方便.洛氏硬度可適用于測定由極軟到極硬的金屬材料,它彌補了布氏法的不是,較布氏法簡(jiǎn)便,可直接從硬度機的表盤(pán)讀出硬度值.但是,由于其壓痕小,故硬度值不如布氏法準確.
                 

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