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金屬材料室温拉伸试验方法GB/T228-2002

作者：來源：发布日期： 2020.10.15

信息摘要：

金屬材料室温拉伸试验方法GB/T228-2002

客戶名稱：某公司
试样名称：金屬材料室温拉伸试验方法
執行標准：GB/T228-2002
試樣數量：3種共11根試樣
设备：10T电子拉力试验机、引伸计（10/20变形为10mm，标距为20mm）；

試驗方案：
1.先用上夾具夾試樣的上端，軟件清零；
2.夾緊夾具，力值回零；
3.夾緊引伸計，軟件清零；
4.運行，真到試樣斷裂；

試驗報告：最大力、屈服強度、抗拉強度、伸長率、斷後伸長率；

試驗報告及特征曲線圖：

GB/T228-2002標准的適用範圍

标准适用于金屬材料（包括黑色和有色金屬材料，但不包括金屬构件和零件）室温拉伸性能的测定，试样或产品的横截面尺寸≮0.1mm。对于小横截面尺寸的金屬产品，例如金屬箔、超细丝和毛细管等的拉伸试验需要双方协议。

其原因在于：①橫截面小的産品，按照標准中建議的量具分辨力要求不能滿足附錄A和附錄C規定橫截面測定准確度在±1%和±2%以內的要求。

②試樣標距采用常規的劃細線、打小沖點等方法進行標記不可行。

③常用的引伸計不適用于此類型産品試樣的試驗。試樣的夾持方法需要特殊夾頭等。

室溫的溫度範圍

标准中规定室溫的溫度範圍为10-35℃，超出这一范围不属于室温。对于材料在这一温度范围内性能对温度敏感而采用更严格的温度范围试验时，应采用23±5℃的控制温度。上述10-35℃的温度范围实质是指容许的试样温度范围，只要试样的温度是在这规定的室温范围内便符合标准要求。

標准中的引用標准

標准中的第二章引用了6個國家標准，即：
GB/T2975-1998钢及钢产品力学性能试验取样位置和试样制备（eqv ISO377：1997）
GB/T8170-1987數值修約規則
GB/T12160-2002单轴试验用引伸计的标定（idt ISO9513：1999）
GB/T16825-1997拉力试验机的实验（idt ISO7500—1：1986）
GB/T17600.1—1998钢的伸长率换算第1部分：碳素钢和低合金钢（eqv ISO2566—1：1984）
GB/T17600.2—1998钢的伸长率换算第2部分：奥氏体钢（eqv ISO2566—2：1984）

標准中通過注日期引用的這6個國家標准是構成GB/T228—2002標准本身不可缺少的部分，應遵照被引用的6個標准中的相關規定和要求，其中被引用的5個標准分別等同和等效相應的國際標准。目前，GB/T8170—1987《數值修約規則》還沒有相對應的國際標准。

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