Research on Heat Treatment Influence Factors on High-Pressure Cylinder Steel 30CrMo-M

2010 ◽  
Vol 97-101 ◽  
pp. 771-776 ◽  
Author(s):  
Zhong Guo Huang ◽  
Hong Lei Dong ◽  
Qing Hua Yuan ◽  
Shun Yao Jin ◽  
Jia Fan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Pressure ◽  
Chemical Composition ◽  
Wall Structure ◽  
Carbon Equivalent ◽  
Temper Brittleness ◽  
High Pressure Cylinder ◽  
Treatment Technology ◽  
Tempering Temperature ◽  
Pressure Cylinder

To increase comprehensive properties of cylinder steel, high-pressure cylinder steel 30CrMo-M was developed on the basis of steel 30CrMo. Tests and researches were made on factors which influence heat treatment properties, such as chemical composition, quenching temperature, and tempering temperature. The results indicated that the 30CrMo-M steel has stable chemical composition, its strength rises with increase of carbon equivalent, and thus it has better relativity. When concentration of quenching liquid is 5%, yield ratio of the steel can be guaranteed to be low, thus safety of cylinder is improved. Tempered between 570°C~622°C, the strength of the steel is increased and plasticity rises with increase of temperature. When tempered at 570°C, inner wall structure of cylinder contains tempering martensite, the strength is high but the plasticity is low. When tempered between 610°C~615°C, temper brittleness happens very easily and toughness is on the low side. The best heat treatment technology is: quenched at 930°C with temperature holding for 40 minutes and quenching liquid concentration as 5%, tempered at 580°C with temperature kept for 90 minutes. The microstructure treated by this technology is tempered sorbite with higher strength, plasticity and toughness.

Experience in Reconstructing the PT-60-90 Turbine by Reconditioning Heat Treatment of the High-Pressure Cylinder Shell

2018 ◽  
Vol 65 (6) ◽  
pp. 331-339
Author(s):  
V. V. Ermolaev ◽  
L. A. Zhuchenko ◽  
A. A. Lyubimov ◽  
V. I. Gladshtein ◽  
V. L. Kremer
Keyword(s):  
Heat Treatment ◽  
High Pressure ◽  
High Pressure Cylinder ◽  
Pressure Cylinder

Exploring Autofrettage Process to Improve the Fatigue Life on High-Pressure Cylinder

2013 ◽  
Vol 457-458 ◽  
pp. 518-521
Author(s):  
Feng Ling Yang ◽  
Shi Jin Zhang
Keyword(s):  
High Pressure ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Fatigue Analysis ◽  
High Pressure Cylinder ◽  
Pressure Cylinder ◽  
Surface Variation ◽  
Life Improvement ◽  
Improve Fatigue Strength ◽  
Improve Fatigue

Autofrettage process is now widely used to improve fatigue strength of high pressure components. This paper focuses on the fatigue life improvement of the high-pressure cylinder treated by autofrettage process. In this process, a high pressure cylinder treated by autofrettage process has been simulated by using FEA software, and surface variation of the cylinder has been analyzed. To further understand this process, theoretical fatigue analysis has also been carried out.

High Pressure and Flow Rate Measurements on Peroxide Dosing Pumps Under Laboratory and Site Conditions

2006 ◽  
Author(s):  
Franz H. Trieb ◽  
Reinhard Karl ◽  
Rene Moderer
Keyword(s):  
High Pressure ◽  
Flow Rate ◽  
Research Work ◽  
Maximum Pressure ◽  
Hydraulic Pressure ◽  
Site Conditions ◽  
High Pressure Cylinder ◽  
Injection Pump ◽  
Pressure Cylinder ◽  
High Pressure Level

The performance and reliability of peroxide dosing pumps are essential for every LDPE plant. The paper presents the results of measurement at an initiator injection pump under laboratory and site conditions. The recording was done with a flow meter and a high pressure transducer, both suitable for a maximum pressure of 400 MPa. It compares the results of hydraulic pressure inside the actuating cylinder at the intensifier with high pressure level and flow rate on the discharge connection of the pump. Direct measurement inside the high pressure cylinder and the possibilities to influence the fluctuations with a servo valve system round out the research work.

scholarly journals Specific Features of the Replacement of the Available Flow Path by the Optimal Flow Path when Upgrading the Steam Turbine High-Pressure Cylinder

2021 ◽  
pp. 5-11
Author(s):  
Riza Sherfedinov ◽  
Oleksandr Usatyi ◽  
Olena Avdieieva ◽  
Mykhailo Daludin ◽  
Illia Yenin
Keyword(s):  
High Pressure ◽  
Turbine Unit ◽  
Optimization Problem ◽  
Flow Path ◽  
Feed Water ◽  
High Pressure Cylinder ◽  
Efficient Operation ◽  
Thermal Circuit ◽  
Optimal Flow ◽  
Pressure Cylinder

This scientific paper gives the main research data obtained during the solution of the search problem to define optimal parameter values for the thermal circuit of the К-540-23.5 turbine unit that would provide the most efficient operation both for the optimal version of the high pressure cylinder (HPC) as part of the turbine unit and the turbine unit on the whole. The effect of the distribution of heat differences in the stages of the optimal flow part of the high pressure cylinder used by the К-540-23.5 turbine on the integral quality factors of the turbine unit has been assessed. The calculation studies of the thermal circuit of the turbine unit with the optimal flow section of the high-pressure cylinder showed that the temperature of the underheated feed water in the high pressure heater (HPH) arranged near the steam generator has the most critical effect on the power and economical efficiency of the high pressure cylinder and entire turbine unit. The two-criterion Pareto problem for the upgrading of the turbine unit was formulated and solved to define optimal underheating temperature values. Consideration was given to the two variants of the solution of the optimization problem for the feed water underheating temperature in the high pressure heater. Comparison and analysis of the two variants of solution for the two-criterion optimization problem showed the identity of the obtained data and it confirms the correctness of the problem formulation and the algorithms used for its solution.

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