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Weathering steel flame straightening process

A technology of flame straightening and weathering steel, applied in the direction of manufacturing tools, heat treatment equipment, heat treatment process control, etc.

Inactive Publication Date: 2012-07-25
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Weathering steel flame straightening process
  • Weathering steel flame straightening process
  • Weathering steel flame straightening process

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Embodiment Construction

[0022] The following takes S355J2W weathering steel as an example, and describes the implementation steps and technical points of this process in conjunction with the attached drawings:

[0023] (1) Select the measurement temperature range -32°C to 1350°C, the measurement distance ratio is 30:1, the measurement accuracy is ±1.5%, the resolution is 0.1°C, the response time is <1 second, the spectral response is 8-14um, and the emissivity is 0.10-1.00. Adjust the infrared thermometer, read the instructions carefully before use, master the principle and method of use;

[0024] (2) According to the flame heating temperature parameters of S355J2W weathering steel, the emissivity of the infrared thermometer is actually calibrated in order to accurately control the heating specification, ( figure 2 is the relationship curve between the emissivity of the infrared thermometer actually calibrated and the surface temperature of the S355J2W weathering steel workpiece);

[0025] (3) Make...

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Abstract

The invention relates to a weathering steel flame straightening process, belonging to the technical field of metal material processing. The weathering steel flame straightening process comprises the following steps: calibrating the emissivity of an infrared thermometer according to different materials; determining that the test distance ratio is 30:1; heating a workpiece heating area uniformly by using the neutral oxyacetylene flame, and monitoring the center area of the workpiece heating area in real time by using the infrared thermometer; controlling the highest heating temperature of a flame straightening area on the workpiece at 730-750 DEG C, controlling the emissivity of the infrared thermometer at 0.85, keeping the highest heating temperature of the flame straightening area at 730-750 DEG C for 2 to 3 minutes after the highest heating temperature of the flame straightening area reaches 730-750 DEG C, and cooling the workpiece heating area in air. Due to the adoption of the method, the hardness and the strength of the weathering steel flame straightening area can be close to those of the base material, the metal low-temperature impact energy of the weathering steel flame straightening area can be higher than that of the base material, and at the test temperature of 40 DEG C below zero, the impact energy of the weathering steel flame straightening area of which the highest heating temperature is controlled at 600-650 DEG C can be 2.5 times of that of the workpiece made of the same material.

Description

technical field [0001] The invention belongs to the technical field of metal material processing technology, and in particular relates to a weathering steel flame straightening technology. Background technique [0002] Flame straightening is a common manufacturing process for low carbon steel welded structures. The weathering steel is the hot-rolled plate selected for the welding frame of the high-speed EMU bogie. And because it contains certain alloy components, such as copper, phosphorus, chromium, nickel, etc., the sensitivity of this type of steel to flame heating is significantly higher than that of ordinary low-carbon steel. Once the flame heating temperature is improperly selected or deviates greatly, the properties of the base metal in the flame heating zone will change significantly ( figure 1 ), seriously reducing the performance and operational safety of the bogie frame. At home and abroad, they are also very cautious about using flame straightening technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/52C21D11/00
Inventor 李贵忠白志范李洪梅刘学
Owner JILIN UNIV
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