Threaded steel bar library: Chemical composition and mechanical properties of PSB830 precision rolled threaded steel bars
Hit：132026-06-12 10:04:55
Threaded steel bar library: Chemical composition and mechanical properties of PSB830 precision rolled threaded steel bars
The chemical composition and mechanical properties of PSB830 precision rolled threaded steel bars are clearly required in national standards and industry data, with specific indicators as follows:
1、 Chemical composition requirements
According to the current national standard specifications, the general requirements are:
Standard general restrictions: In smelting analysis, the sulfur (S) and phosphorus (P) content should not exceed 0.040%, and some engineering standards require sulfur and phosphorus to not exceed 0.035%.
Finished product deviation: The allowable deviation for chemical composition analysis of finished steel bars must comply with the provisions of GB/T 222.
Specific process formula: In a patented production process, the chemical composition (mass percentage) of PSB830 precision rolled threaded steel bars is: C:0.43%～0.48%、Si:1.60%～1.80%、Mn:0.90%～1.00%、(Cr+Ni+Cu)≤0.10%、Nb:0.01%～0.025%、V:0.125%～0.155%、P≤0.020%、S≤0.015%、N:75～110ppm， The remaining amount is Fe and inevitable impurities.
2、 Mechanical performance indicators
The core mechanical performance requirements are unified, and the specific indicators are as follows:
Performance indicators require numerical values
Yield strength (specified non proportional tensile strength) ≥ 830MPa
Tensile strength ≥ 1030MPa
Post fracture elongation ≥ 6%
Maximum force total elongation ≥ 3.5%
Stress relaxation performance (initial stress 0.8 times yield strength), stress relaxation rate ≤ 3% after 1000 hours
Note: PSB code represents threaded steel bars for prestressed concrete, and the number 830 corresponds to a minimum yield strength of 830MPa. This steel bar specification covers diameters of 15mm-50mm, with commonly used specifications of 25mm and 32mm. It is mainly used in large concrete prestressed structures such as water conservancy, bridges, and nuclear power plants.
PSB830 precision rolled threaded steel bar
