用硬度试验法判定钢制管法兰的可焊性

• 作 者: 武晋花
• 机 构: 山西省钢铁产品质量监督检验站 太原 030001
• 出 处: 冶金标准化与质量
• 发表日期: 1995年01期
• 关键词: 硬度试验 可焊性 法兰 碳素结构钢 布氏硬度 焊接接头 金属材料 力学性能 工艺过程 金属硬度

国家标准钢制管法兰技术条件GB9125—88中第2.1条对于用Q235钢所制成的钢制管法兰要求“其化学成分、力学性能及其它要求应符合有关标准的规定”,并在表1中指出Q235钢的国家标准为GB700。在现行的GB700—88碳素结构钢标准中并没有提到硬度,而在实际应用中,由于钢制管法兰的生产工艺过程的特点,使同一批号钢材制出的法兰,有的能焊接使用,有的一焊就裂。怎样判定法兰的可焊性呢?我们与用户遇到了同样的难题,那么我们首先想到的是既不毁坏制品,又能了解其性能的金属硬度检测方法。

National standard steel pipe flanges technical conditions GB9125-88 in Article 2.1 For Q235 steel made of steel pipe flanges require “its chemical composition, mechanical properties and other requirements should be consistent with the relevant provisions of the standard” and in Table 1 indicates that the national standard for Q235 steel is GB700. In the current GB700-88 carbon steel standard does not refer to the hardness of the standard, and in practical applications, due to the characteristics of steel pipe flange production process, so that the same batch of steel flange, and some can Welding use, and some welded on the crack. How to determine the weldability of the flange? We encountered the same problem with the user, then we first think of it is not damaged products, but also understand the performance of the metal hardness detection method.