Stainless steel sink stamping cracking/Customers are using a stainless steel hot-rolled NO.1 coil from a steel plant, and through cold rolling and rolling to open an equal process, stamping cracking occurs in the process of sending to the downstream customer's stamping sink, and file a quality objection complaint and claim to the steel mill. After receiving complaints from users, the steel plant first understands the sink stamping process and the proportion of stamping cracking. Generally, the stamping cracking ratio of metal materials is within 5% under normal circumstances, and this stamping cracking ratio deducts normal wear and tear. 30%. At the same time, customers provide local spectrum inspection, which reflects the low copper content. 1. For the batch of stainless steel hot-rolled NO.1 rolls, the steel mill traced the roots from the steel-making, hot-rolling and pickling production processes. The process inspection of the key control points of each production process did not cause abnormal quality fluctuations in the production process. 2. For the surface hardness (HRB) test of raw materials, the average value of the hardness (HRB) is 90.6. At the same time, the composition of the sample is tested by the moisture method, and the copper content is controlled normally. 3. Analysis of inclusions, there are mainly Class A (sulfide) and Class B (alumina) inclusions on the original board, both of which are grade 2, which is within the normal control range. The structure is an austenite structure with a grain size of 6.5, and no carbides precipitate at the grain boundaries. 4. All the circulation links of stainless steel hot-rolled N0.1 coil are analyzed from the process of slitting, rolling, annealing and opening, and no abnormalities have occurred. 5. The photos of the cracking morphology of the sink are required by downstream customers. From the analysis of the cracking morphology of the sink, when the blank holding amount of the stamping parts is relatively rich, the sink is cracked at the same place. It is recommended that the customer consider mold matching and lubrication conditions is it suitable. There is no quality problem in the base material of the steel plant. It is recommended that customers adopt different stamping modes and stamping at the cracks for stamping parts, and dynamically adjust the mold degree in the hot die state.