Current label: Directly sold by square tube manufacturer
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Classification of seamless square tube: 1. Hardness is the pointer to weigh the soft and hard level of metal materials. At present, the indentation hardness method is commonly used to measure the hardness in consumption. It uses the indenter with corresponding geometric shape to press into the surface of the metal data to be tested under the corresponding load, and measures the hardness value according to the indentation level. Common methods include Brinell hardness (HB) and Rockwell hardness (HRA