Dongyang sun of Steel Materials Co., Ltd. to introduce you to the knowledge of steel structure fire. Shielded. Steel is set in the wall or ceiling refractory composition, or the components concealed in the space between the two walls, as long as a slight increase or no increase refractories that can achieve the purpose of fire protection. This is one of the most economical method of fire. Dongyang sun of Steel Materials Co., Ltd. to introduce you to the strength of steel materials, plastic and measurement (4) and measured hardness, resistance to local deformation of steel material cottages much money, especially plastic deformation, indentation, or draw the ability to hurt, is a measure of the basis of hard and soft metal factory direct small villa, known as hardness. Hardness test operation simple, rapid cottages wholesale price, not necessarily specific sample, and does not destroy the parts, based on the measured hardness values, can estimate the approximate intensity values ??of metallic materials, they have been widely used. Hardness also affects the abrasion-resistant material, in general, the higher the hardness of the metal, the better the wear resistance. The method of measuring the hardness of many, the most commonly used are Brinell hardness test, Rockwell hardness test method and the Vickers hardness test. For example; Brinell hardness test is based on a certain diameter of the ball or carbide ball to beat the corresponding test sample surface, the provision to maintain a certain time after removing the test force is calculated using the surface hardness indentation diameter measurement an indentation test. Which small villa | Dongyang small villa | sun of Steel Materials business confidence provided by Dongyang sun of Steel Materials Co., Ltd. Dongyang sun of Steel Materials Co., Ltd. (www.dysdjg.com) strong, credible, Jinhua in Zhejiang steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the sun of steel material and you hand into the brilliant, for a better future!