The copper brittleness defects control of ASTM Corten B weathering steel

The furnace time, thickness and furnace temperature, and the copper nickel ratio etc. are the main factors that lead to copper brittleness defects of ASTM Corten B weathering steel.

The general preventive measures for copper embrittlement of ASTM Corten B weathering steel are:

1. Optimization of heating process and reasonable sequencing can avoid the accumulation and accumulation of copper elements in ASTM Corten B weathering steel during heating process, thus reducing the occurrence of copper brittle defects.

2. The effect of furnace time on copper brittleness of ASTM Corten B weathering steel is great. The longer the furnace time is, the longer it is beneficial to the diffusion of copper elements along the grain boundary, the more easy to form crack like cracks or bubble like copper brittleness. The data show that the furnace time is generally controlled in less than 360min, which is more suitable. When the furnace time is > 360min, the thin gauge products should be reformed. Otherwise, the slab should be removed and retreated.

4. The temperature should be controlled at < 1210 C or more than 1280 C. When the oven temperature is 1210-1280 C, the order of thickness less than 3.3mm is preferred.

5, the addition of nickel elements can reduce or eliminate copper brittleness of ASTM Corten B weathering steel. Due to the minimum influence of the ratio of copper and nickel, and the high cost of nickel elements, the low nickel or nickel free steel can be developed after taking the above measures.

For more information about the copper brittleness defects control of ASTM Corten B weathering steel, welcome to discuss with BBN steel at any time.