Henan malpractice Construction Engineering Testing Co., Ltd. is a professional testing company, is one of the qualification place in Henan Province since the first detection through examination of business. Business in the Pile qualification qualification, the qualification grade steel, a qualified indoor environment, building energy efficiency testing, subject testing, materials testing, Yongcheng indoor environment testing, curtain detection, detection of roads and bridges, air defense projects to detect a number of aptitude test and testing laboratories. Cold working process is the normal temperature of cold-drawn steel, cold drawn, cold rolled and other technology in general. In the cold process, the plastic deformation of steel produced, and cause it to increase strength and hardness, lower ductility and toughness, called cold strengthened. Causes cold rolled steel reinforced plastic deformation process, grain crushing and refining, lattice stretched, crushed or distorted and other aberrations, grain boundary dislocation density increases. Henan malpractice Construction Engineering Testing Co., Ltd. is a professional testing company, is one of the qualification place in Henan Province since the first detection through examination of business. Business in the Pile qualification qualification, the qualification grade steel, a qualified indoor environment, building energy efficiency testing, subject testing, materials testing, curtain detection, detection of roads and bridges, air defense projects to detect a number of test qualification and testing laboratories. ① measured elongation will have to pull off the ends of the specimen aligned breaks, environmental testing, as far as possible so that its axis is located on a straight line. Pull off such a gap is formed at a variety of reasons, Sui indoor environment testing, this gap should be included in the specimen fractured the inner part of the gauge length. ② such as when to pull off at the end of the gauge near distance greater than l0 / 3, Xiangcheng indoor environment testing, can directly measure out has been stretched caliper gauge length l1 (mm). ③ pull off at a distance as close gauge endpoint is less than or equal to l0 / 3 时 that, according to the following shift method to determine l1: in length, from O to take place to pull off a short section substantially equal to the number of cells to obtain B point Then take the remaining segment length equal to the number of cells (a)) of the half to give C points; Or take the remainder of the cell number (odd number, minus 1 and plus 1 of the half to give C and C1 respectively shifted point l1 the AO + OB + 2BC or AO + OB + BC + BC1. As direct measurements obtained elongation can reach a predetermined value and technical conditions, you can not use the shift method .④ as specimens in the gauge endpoint or gauge of the fracture, the test result is invalid, retest Zhecheng Indoor Environment Test |. malpractice inspection station (certified) | environmental testing provided by the Henan malpractice malpractice Construction Engineering Testing Co., Ltd. Henan Construction Engineering Testing Co., Ltd. (www.hnrsjc.cn) (www.. rsgcjc.com) is a leader in Zhengzhou, construction, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs in malpractice detected leadership with the staff warmly welcome all inquiries negotiations to create a better future for the increasing prevalence of detection.