Hardness is a measure of the hardness of the metal material pointer, current production measured in square and rectangular tube stiffness method most commonly used is the indentation hardness method, it is certain geometry indenter load under certain hair pushed to be tested metal surface, according to the extent of being pressed into test the hardness value. Hardness is a measure of the hardness of the metal material pointer, current production measured in square and rectangular tube stiffness method most commonly used is the indentation hardness method, it is certain geometry indenter load under certain hair pushed to be tested metal surface, according to the extent of being pressed into test the hardness value. Mastery of Tianjin Steel Trade Co., Ltd. The production of large diameter, thick-walled Rectangular Pipe fill some gaps at home and abroad, the products are widely used in large steel construction, machinery manufacturing, shipbuilding, construction, metallurgical industry, automobile, railways, road, air, container, furniture, decoration and other industries. Depending on the product quality as the lifeblood, personnel for building products, Heilongjiang square tube, layers of strict quality products the company has passed ISO9001:. 2008 quality management system certification, product in 2012 by the European Union EN 10210-1 : 2006,304 square tube, 10219-1: 2006 CE certification. Companies with "multi-species, large inventories, high quality, low prices, shorter delivery time and perfect after-sales service" and many other competitive advantages, has become many large enterprises designated suppliers, customers in more than twenty provinces regions and exported to the United States, Canada, Russia, India, Malaysia, Europe and other countries and regions. Adequate Tianjin Steel Trade Co., Ltd. Mastery stocks, hot galvanized square tube price, full of different specifications. In the low-cost operation, square tube price, quality first sale doctrine, allows customers to buy the rest assured that with the Shuxin! Integrity, professional and efficient service is our aim, we will be happy to provide excellent products and quality service to new and old customers, wholeheartedly welcome new and old customers calls, letters, come to negotiate business and guide our work! 304 square tube, square tube Heilongjiang, accessible from the Tianjin Steel Union Steel Union Co., Ltd. Mastery. Mastery of Tianjin Steel Trade Co., Ltd. (www.tjtdgl.com) (www.tdglgt.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving access innovative ideas will lead VAI into the brilliant and you work for a better future!