Cause of corrosion pits on TB stadndard 09CuPCrNi-B

S355J2+N steel plate belongs to the European standard low alloy structural steel grade. S355J2 steel is equivalent to Q345D grade. TB stadndard 09CUPCRNI-B, S355J2+N low alloy steel plate is widely used in bridges, vehicles, ships, building steel structures. Mechanical properties of S355J2+N steel: Yield strength: ≤16mm: ≥355; 16-40: ≥345; 40-63: ≥335; 63-80: ≥325;80-100: ≥315; 100-150: 295; 150-200: ≥285; 200-250: ≥275; 250-400: ≥265. Tensile strength: 450-680MPa.

In recent years, in line with the development trend of iron and TB stadndard 09CUPCRNI-B steel industry at home and abroad, we have accelerated the transformation of development mode, promoted structural adjustment, and formed a rich product series of medium and thick plates, hot rolled steel coils, profiles, steel pipes, etc., which TB stadndard 09CUPCRNI-B are widely used in automobiles, long-span bridges, railways, machinery, ocean and so on fields. Meanwhile, we also provide deep processing for the steel materials.

The company has passed ISO quality management system certification, domestic advanced production technology, and high product batch stability. Selected materials, the source controls every quality link to ensure TB stadndard 09CUPCRNI-B product high quality. Use automated, scientific and systematic manufacturing processes to meet the different needs of customers. Become an excellent domestic steel plate manufacturer, serving customers all over the world.

With the increase of temperature, the yield limit of TB stadndard 09CUPCRNI-B will decrease monotonically, but the tensile strength of TB stadndard 09CUPCRNI-B will rise to a high peak value at a certain temperature, and then decrease. This peak temperature is called the blue brittleness temperature of TB stadndard 09CUPCRNI-B. Near the blue brittleness temperature, the TB stadndard 09CUPCRNI-B strength increases and the plasticity decreases. The elongation and section shrinkage of TB stadndard 09CUPCRNI-B increase with the increase of temperature, but there is a low peak at the blue brittleness temperature. The blue brittleness temperature of low carbon steel ranges from 200 ℃ to 250 ℃. The blue brittleness of low alloy steel is not obvious as that of low carbon steel, and the blue brittleness temperature is higher.

The company has passed the ISO9001: 2008 quality system certification, strictly implemented the ISO9001 quality management system. Besides, we have continuously improved the after-sales service network to make every effort to provide more convenient, accurate and faster services for all customers. We will supervise the production, control the quality in the factory, Inspect the cargo before shipment, Issue the test report to sales department. From the steel prodcution to steel delivery, we always focus the whole process.