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Method for determining phase transformation point of low alloy steel Ar3

A low-alloy steel, phase transition point technology, applied in the investigation phase/state change, complex mathematical operations, etc., can solve time-consuming, high-cost problems, and achieve low-cost results

Inactive Publication Date: 2018-05-11
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The present invention proposes a fast, low-cost, suitable for large-scale determination of low-alloy steel Ar 3 The method of phase transition point solves the problem of determining low alloy steel Ar by conventional methods 3 The phase transition point is time-consuming and costly, and it is difficult to measure Ar quickly and on a large scale 3 The question of transition point

Method used

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  • Method for determining phase transformation point of low alloy steel Ar3
  • Method for determining phase transformation point of low alloy steel Ar3

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A Method for Determination of Ar in Low Alloy Steel 3 The method of phase transition point, comprises the following steps:

[0026] 1) analyze the mass percent of carbon, silicon, manganese, phosphorus, sulfur five kinds of elements in commercially available 20Mn steel, wherein, the mass percent of carbon is 0.17%, the mass percent of silicon is 0.29%, the mass percent of manganese is 0.82%, The mass percentage of phosphorus is 0.009%, and the mass percentage of sulfur is 0.016%.

[0027] 2) The mass percent of each element obtained in step 1) is brought into the following formula:

[0028] the y Ar3 =848.87-153.73ω C +33.99ω Si -84.20ω Mn +406.54ω P -1297.37ω S -2.29ω Cu +77.31ω Al -78.54ω Ni -13.01ω Cr +461.94ω Ti +57.29ω Mo +51.36ω V -304.62ω Nb Calculate the Ar of 20Mn steel 3 Phase transition point y Ar3 is 746.4°C, where, y Ar3 Ar for steel 3 Phase transition point, unit is °C; ω C , ω Si , ω Mn , ω P , ω S , ω Cu , ω Al , ω Ni , ω Cr , ω...

Embodiment 2

[0030] A Method for Determination of Ar in Low Alloy Steel 3 The method of phase transition point, comprises the following steps:

[0031] 1) Analyze the mass percentages of seven elements of carbon, silicon, manganese, phosphorus, sulfur, titanium and alum in the commercially available 10MnVTi steel, wherein the mass percentage of carbon is 0.11%, the mass percentage of silicon is 0.28%, and the mass percentage of manganese 1.6%, the mass percentage of phosphorus is 0.023%, the mass percentage of sulfur is 0.0073%, the mass percentage of titanium is 0.038%, and the mass percentage of vanadium is 0.033%.

[0032] 2) The mass percent of each element obtained in step 1) is brought into the following formula:

[0033] the y Ar3 =848.87-153.73ω C +33.99ω Si -84.20ω Mn +406.54ω P -1297.37ω S -2.29ω Cu +77.31ω Al -78.54ω Ni -13.01ω Cr +461.94ω Ti +57.29ω Mo +51.36ω V -304.62ω Nb Calculation of Ar in 10MnVTi steel 3 Phase transition point y Ar3 is 725.9°C, where, y ...

Embodiment 3

[0035] A Method for Determination of Ar in Low Alloy Steel 3 The method of phase transition point, comprises the following steps:

[0036] 1) Analyze the mass percentages of seven elements of carbon, silicon, manganese, phosphorus, sulfur, chromium and molybdenum in commercially available 45CrMo steel, wherein the mass percentage of carbon is 0.44%, the mass percentage of silicon is 0.33%, and the mass percentage of manganese 0.78%, the mass percentage of phosphorus is 0.021%, the mass percentage of sulfur is 0.021%, the mass percentage of chromium is 1.03%, and the mass percentage of molybdenum is 0.19%.

[0037] 2) The mass percent of each element obtained in step 1) is brought into the following formula:

[0038] the y Ar3 =848.87-153.73ω C +33.99ω Si -84.20ω Mn +406.54ω P -1297.37ω S -2.29ω Cu +77.31ω Al -78.54ω Ni -13.01ω Cr +461.94ω Ti +57.29ω Mo +51.36ω V -304.62ω Nb Calculate the Ar of 45CrMo steel 3 Phase transition point y Ar3 is 705.5°C, where, y A...

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Abstract

The invention belongs to the technical field of controlled rolling and controlled cooling of low alloy steel, and particularly provides a method for determining the phase transformation point of low alloy steel Ar3. The method comprises the following steps: determining mass percentages of thirteen elements including C, Si, Mn, P, S, Cu, Al, Ni, Cr, Ti, Mo, V and Nb in the low alloy steel, and writing the mass percentages as omega C, omega Si, omega Mn, omega P, omega S, omega Cu, omega Al, omega Ni, omega Cr, omega Ti, omega Mo, omega V and omega Nb respectively; substituting the data into thefollowing multiple linear regression equation: yAr3 = 848.87-153.73 omega C+33.99 omega Si-84.20 omega Mn+406.54 omega P-1297.37 omega S-2.29 omega Cu+77.31 omega Al-78.54 omega Ni-13.01 omega Cr+461.94 omega Ti+57.29 omega Mo+51.36 omega V-304.62omega Nb, and calculating the phase transformation point yAr3 of the low alloy steel Ar3, wherein the following conditions are met: omega C is larger than 0.003 and smaller than 1.0, omega Si is larger than 0.02 and smaller than 1.8, omega Mn is larger than 0.05 and smaller than 2.0, omega P is larger than 0 and smaller than 0.08, omega S is larger than 0 and smaller than 0.026, omega Cu is larger than 0 and smaller than 1.2, omega Al is larger than 0 and smaller than 0.1, omega Ni is larger than 0 and smaller than 1.27, omega Cr larger than 0 and smaller than 2.0, omega Ti is larger than 0 and smaller than 0.1, omega Mo is larger than 0 and smaller than 0.35, omega V is larger than 0 and smaller than 0.15, and omega Nb is larger than 0 and smaller than 0.055. The problems of high time consumption, high cost and difficult quick and massive determination of the phase transformation point of Ar3 when the phase transformation point of the low alloy steel Ar3 is determined with the conventional methods are solved. The method has the advantages of being quick, low in cost and suitable for massive determination of the phase transformation point of the low alloy steel Ar3.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel controlled rolling and controlled cooling, and specifically provides a method for measuring Ar of low-alloy steel. 3 The method of phase transition point. Background technique [0002] Low-alloy steel is based on carbon steel by adding one or several alloying elements (the total amount of the alloy is less than 5%) so that it not only has high strength but also has toughness and formability in the hot-rolled or heat-treated state. , Welding performance, corrosion resistance and other comprehensive performance characteristics. Low alloy steels are widely used in general engineering structures such as pressure vessels, bridges, ships, railways, automobiles or other various purposes. [0003] Controlled rolling and controlled cooling technology are frequently used technologies in steel rolling in the world. Controlled rolling is an adjustment technique for transforming an austenite state i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/12G06F17/18
Inventor 刘文艳陈叶清黄治军王辉褚乃强缪凯冀汉巍赵隆崎
Owner 武汉钢铁有限公司
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