Study on the Heat Treatment Process of Ultra Thick Plate of 12Cr2Mo1R Pressure Vessel Steel

2014 ◽  
Vol 556-562 ◽  
pp. 476-479
Author(s):  
Ming Xing Zhou ◽  
Guang Xu ◽  
Hai Lin Yang ◽  
Tao Xiong
Keyword(s):  
Heat Treatment ◽  
Pressure Vessel ◽  
Thick Plate ◽  
Treatment Process ◽  
Pressure Vessel Steel ◽  
Heat Treatment Process ◽  
Water Cooling ◽  
Simulation Experiments ◽  
Vessel Steel ◽  
Element Simulation

The heat treatment process, normalizing plus tempering, of 150 mm-thick plate of 12Cr2Mo1R pressure vessel steel was proposed according to the results of finite element simulation and static CCT curve obtained by thermal simulation experiments. After normalizing at 910 °C for 10 minutes followed by water cooling and tempering at 650 °C for 60 minutes, the microstructure at 1/4 position along the thickness direction of the thick plate consists of bainite and all the mechanical properties meet delivery requirements.

Factors Affecting the Notch Toughness of Carbon and Low-Alloy Steel Forgings for Pressure Vessel and Piping Applications

1978 ◽  
Vol 100 (4) ◽  
pp. 338-347 ◽  
Author(s):  
E. G. Nisbett
Keyword(s):  
Heat Treatment ◽  
Pressure Vessel ◽  
Treatment Process ◽  
Mechanical Test ◽  
Notch Toughness ◽  
Heat Treatment Process ◽  
Low Alloy Steel ◽  
Intercritical Temperature Range ◽  
Factors Affecting

When notch toughness is required in a forging for pressure vessel or piping application, many phases of the manufacturing process are involved. Some significant aspects including the role of the material specification, chemistry balance, mechanical test locations, forging practice and heat treatment are reviewed. A variant of the heat treatment process is described which utilizes quenching from the intercritical temperature range as a means of enhancing notch toughness.

Effects of a Postweld Heat Treatment on a Submerged Arc Welded ASTM A537 Pressure Vessel Steel

2001 ◽  
Vol 10 (3) ◽  
pp. 249-257 ◽  
Author(s):  
Vera Luicia Otheiro de Brito ◽  
Herman Jacobus Cornelis Voorwald ◽  
Nasareno das Neves ◽  
Ivani de S. Bott
Keyword(s):  
Heat Treatment ◽  
Pressure Vessel ◽  
Postweld Heat Treatment ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Postweld Heat ◽  
Submerged Arc

scholarly journals Application of Response Surface Methodology for Modeling of Postweld Heat Treatment Process in a Pressure Vessel Steel ASTM A516 Grade 70

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Prachya Peasura
Keyword(s):  
Heat Treatment ◽  
Mathematical Model ◽  
Tensile Strength ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Pressure Vessel ◽  
Postweld Heat Treatment ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Postweld Heat

This research studied the application of the response surface methodology (RSM) and central composite design (CCD) experiment in mathematical model and optimizes postweld heat treatment (PWHT). The material of study is a pressure vessel steel ASTM A516 grade 70 that is used for gas metal arc welding. PWHT parameters examined in this study included PWHT temperatures and time. The resulting materials were examined using CCD experiment and the RSM to determine the resulting material tensile strength test, observed with optical microscopy and scanning electron microscopy. The experimental results show that using a full quadratic model with the proposed mathematical model isYTS=-285.521+15.706X1+2.514X2-0.004X12-0.001X22-0.029X1X2. Tensile strength parameters of PWHT were optimized PWHT time of 5.00 hr and PWHT temperature of 645.75°C. The results show that the PWHT time is the dominant mechanism used to modify the tensile strength compared to the PWHT temperatures. This phenomenon could be explained by the fact that pearlite can contribute to higher tensile strength. Pearlite has an intensity, which results in increased material tensile strength. The research described here can be used as material data on PWHT parameters for an ASTM A516 grade 70 weld.

Simulation and Control of Distortion of Hydro Turbine Blade Steel Casting in Heat Treatment Process

2012 ◽  
Vol 706-709 ◽  
pp. 1580-1585
Author(s):  
Hai Liang Yu ◽  
Jin Wu Kang ◽  
Tian You Huang
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Temperature Fields ◽  
Air Cooling ◽  
Heat Treatment Process ◽  
Element Simulation ◽  
Forced Air ◽  
Blade Casting ◽  
And Control ◽  
Good Agreement

Blades are key part of hydro turbines, which often distorts during heat treatment process for their special structures. In this paper, thermal fluid finite element simulation of the forced air cooling process of a blade casting was carried out under a variety of distances between fans and blades, air speeds, groups of fans and circumstance temperatures. The temperature fields of blade castings were obtained. A novel parameter, temperature difference between surfaces of castings along thickness direction, was proposed to analyze the distortion of blade castings. The distortion behavior of blade castings with martensitic stainless steel were discussed, which is in good agreement with distortion regularity of the experimental ones. The temperature differences between blade casting surfaces are always greater than zero, resulting in distortion which could be divided into three stages. Finally, we focused on discussing the control methods of distortion behavior of blade castings which could be operated in actual production.

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