T/TISA 002-2024 Brazing tube carbon structural steel and low alloy high strength steel hot-rolled steel plate

Scope

Main technical contents: 1. Grade and chemical composition This section specifies the grade and chemical composition (smelting analysis), which shall comply with the provisions of GB/T 700 and GB/T 1591. Since the steel strip is used for welding, to ensure the welding performance and comprehensive performance of the welded pipe, it is specifically stipulated that the carbon equivalent (CEV) shall be determined according to the requirements of the purchaser. The CEV can be calculated according to the following formula using the smelting analysis components, and the specific values shall be negotiated between the supplier and the purchaser. CEV (%) = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15 2. Mechanical properties The mechanical and process properties of the steel strip shall comply with the provisions of GB/T 3524. A comparison of this standard with GB/T 700, GB/T 3524, GB/T 8164, and JIS G3106 is shown in Table 1. As can be seen from Table 7, this standard is consistent with GB/T 700, GB/T 3524, and GB/T 8164. Compared with the Japanese standard SM400 (equivalent to domestic Q235), the indicators are equivalent to or higher than the requirements of the Japanese standard. 3. Non-metallic inclusions This is an innovative indicator. The provisions of this section are made to improve the inherent quality of the steel strip. Based on the current domestic smelting level and actual inspection data, the non-metallic inclusions are specified. The following table shows some actual inspection data of Q195 non-metallic inclusions conducted by Rongcheng Steel. According to the actual inspection data and considering the actual situation of most production enterprises, the non-metallic inclusions shall comply with the provisions of the above table.

Development Information

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