2.土木建筑工程材料(国外英文资料).docVIP

2.土木建筑工程材料(国外英文资料) (a) reinforced Classification of 1. commonly used are: steel hot-rolled steel, cold steel, steel wire, steel wire etc.. (1): HPB235, hot rolled steel HRB335, HRB400, HRB500 four grades, each grade can also be used in steel called I, II, III and IV grade steel. The HPB235 reinforced by carbon structural steel and rolled into the surface, light circle, the rest by the high strength low alloy structural steel and rolling, ribbed appearance. With steel grade improved, the yield strength and ultimate strength increases gradually, plastic properties gradually decreased. (2): cold steel machining of hot rolled steel at room temperature (cold drawing, cold drawn and cold rolling) and. The common varieties of cold hot rolled steel, cold rolled ribbed steel bars and cold drawn low carbon steel wire. (3) heat treatment steel heat treatment refers to steel according to certain rules of heating, heat preservation and cooling, change its organization, so as to obtain a process to have performance, normalizing, quenching and tempering and annealing of four ways. Heat treated steel bar is steel hot rolled ribbed steel bars (the medium carbon low-alloy steel) after quenching and high temperature tempering treatment and the heat treatment delivery, coil, each plate length of about 200m. The performance of 2. bar: (1): tensile strength is the main performance of reinforced, tensile properties of the main technical indicators is the yield point (also called yield strength), tensile strength (tensile strength and elongation of the limit). 1) the yield point denoted sigma S, numerical o s s is that the plastic is red. 2) tensile strength: represented by sigma B. The yield ratio of sigma Sigma s/ B has certain significance, the yield ratio is smaller, reflecting the steel stress exceeds the yield point of the possibility of work is more, so the safety of the structure is higher. But the yield strength ratio is too small, is the reflection of steel cannot be effectively