The scratches of 09CuPCrNi-B equivalent grades

GB711-2011 Chinese steel standard is used in the manufacture of steel plates with a 09CUPCRNI-B equivalent grades thickness of not more than 150mm for navigating ships, fishing boats and marine engineering structures in ocean, coastal and inland waterway areas. CCS/NV/GL550 steel is a structural steel for ships and marine engineering, divided into four quality grades A, D, E, F, namely AH550, DH550, EH550, FH550, H is high-strength building materials, and 550 is the lower yield strength.

The metallurgical quality of spring steel should reach the level of high quality steel. Due to the special requirements of production parts, 09CUPCRNI-B equivalent grades, spring steel must have some characteristics. First, the fatigue resistance of spring steel is good, and it can be restored to its original state after repeated use without deformation. Second, good flexibility. Third, the tensile strength of spring steel is good, under the limit of being stretched, it can be restored without breaking.

Normalizing is to heat the steel parts to 30~80℃above the critical temperature for a period of time. Then the parts are taken out of the furnace and cooled in air. Since the cooling rate of normalizing is faster than that of annealing, the strength and hardness of normalized 09CUPCRNI-B equivalent grades are higher than that of annealed 09CUPCRNI-B equivalent grades, but the elimination of internal stress is not as good as annealing. The normalizing operation of 09CUPCRNI-B equivalent grades is simple, the cost is low, the productivity is high, and it is widely used in actual production.

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