Method for reducing hysteresis error of precipitated martensitic stainless steel

A technology of martensitic stainless steel and hysteresis error, which is applied in the field of manufacturing elastic bodies of weighing sensors, can solve the problems of large hysteresis error of martensitic stainless steel and limit the use of popularization, so as to improve dispersion, improve plastic deformation ability, reduce The effect of hysteresis error

Active Publication Date: 2010-08-11
METTLER TOLEDO (CHANGZHOU) PRECISION INSTR CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of steel has the characteristics of both stainless steel and high-strength steel. It is currently one of the materials for making load cell elastomers. Compared with Cr13 martensitic stainless steel, medium carbon structural steel, and hard aluminum and other elastomer materials, precipitation The hysteresis error of martensitic stainless steel is relatively large, which limits the promotion and use of this steel in high-precision analog load cells

Method used

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  • Method for reducing hysteresis error of precipitated martensitic stainless steel
  • Method for reducing hysteresis error of precipitated martensitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The method for reducing the hysteresis error of the precipitated martensitic stainless steel elastomer of the present invention is carried out according to the following steps:

[0016] (1) Solid solution: Put the φ10×100(mm) rod into the heating furnace and heat up with the furnace at a speed of 5°C / min to 15°C / min, and heat it to 1040°C±10°C, and the holding time is 1~ 1.5h, forced cooling to room temperature;

[0017] (2) Cryogenic cooling: Put the forced-cooled bars into liquid nitrogen to cool, the cooling temperature is -70°C~-80°C, and the time is controlled at 2.5~3.5h;

[0018] (3) Deformation processing: the cryogenic bar is stretched or compressed at room temperature at a speed of 5 mm / s, and the elongation or compression rate of the bar along the tension and compression direction is controlled at 3.0% to 5.0%;

[0019] (4) Aging treatment: put the deformed bar into a heating furnace with a temperature not higher than 200°C, and raise the temperature with th...

Embodiment 2

[0021] The method of the present invention reduces the hysteresis error of the precipitated martensitic stainless steel elastomer,

[0022] (1) Solid solution: put the φ18×200(mm) bar into the heating furnace and raise the temperature with the furnace at a speed of 15°C / min to 25°C / min, and heat it to 1040°C±10°C, and the holding time is 1.5°C to 10°C. 2.5h, forced cooling to room temperature;

[0023] (2) Cryogenic cooling: put the bar material after forced cooling into liquid nitrogen to cool, the cooling temperature is -80°C ~ -90°C, and the time is controlled at 3 ~ 4h;

[0024] (3) Deformation processing: the cryogenic bar is stretched or compressed at room temperature at a speed of 2.5 mm / s, and the elongation or compression rate of the bar along the tension and compression direction is controlled at 2.0% to 4.0%;

[0025] (4) Aging treatment: Put the deformed bar into a heating furnace with a temperature not higher than 200°C and raise the temperature with the furnace ...

Embodiment 3

[0027] The method of the present invention reduces the hysteresis error of the precipitated martensitic stainless steel elastomer,

[0028] (1) Solid solution: Put a 20×20×200 (mm) bar into the heating furnace and raise the temperature with the furnace at a speed of 10°C / min to 20°C / min, and heat it to 1040°C±10°C, and the holding time is at 1.5~2.5h, forced to cool to room temperature;

[0029] (2) Cryogenic cooling: Put the forced-cooled bars into liquid nitrogen to cool, the cooling temperature is -80°C ~ -90°C, and the time is controlled at 3.5 ~ 4.5hh;

[0030] (3) Deformation processing: the cryogenic bar is stretched or compressed at room temperature at a speed of 4 mm / s, and the elongation or compression rate of the bar along the tension and compression direction is controlled at 3.0% to 5.0%;

[0031] (4) Aging treatment: Put the deformed bar into a heating furnace with a temperature not higher than 200°C and raise the temperature with the furnace at a rate of 15°C / m...

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Abstract

The invention relates to a method for reducing the hysteresis error of out-precipitated martensitic stainless steel elastomer. The method comprises the following: a step of performing solid solution, which is to heat a bar with a furnace at a speed between 5 and 30 DEG C per minute, heat the bar to 1,040+ / -10 DEG C, preserve heat for 1 to 4 hours and compulsively cool the bar to room temperature;a step of deep cooling, which is to cool the compulsively cooled bar in liquid nitrogen at a cooling temperature between 70 and 90 DEG C below zero for 2.5 to 6 hours; a step of performing deformation processing, which is to stretch or compress the deep cooled bar at a speed less than or equal to 5 millimeters per second at normal temperature and control the elongation or compression ratio of thebar in the stretching / compressing direction between 1.0 and 5.0 percent; a step of aging, which is to put the deformed bar into a heating furnace at a temperature not higher than 200 DEG C, heat the bar with the furnace at a speed between 5 and 30 DEG C per minute, raise the temperature to 480+ / -5 DEG C and preserve the heat for 2.5 to 5 hours. The method improves the capability of out-precipitated martensitic stainless steel in resisting micro-region plastic deformation, and reduces the hysteresis error of weighting sensors.

Description

technical field [0001] The invention relates to a method for reducing hysteresis errors of precipitated martensitic stainless steel elastic bodies, and belongs to the technical field of manufacturing elastic bodies of weighing sensors. Background technique [0002] The resistance strain type load cell is composed of an elastic body, a strain gauge and a detection circuit. The strain gauge is adhered to the elastic body. When the elastic body is loaded by an external force, the elastic body and the strain gauge wire grid are elastically deformed synchronously, and the strain gauge The change of the resistance value of the wire grid, through the detection circuit, realizes the conversion between the loading stress and the electrical signal, and realizes weighing. Hysteresis means that the sensor is loaded step by step from no load to the rated load, and then unloaded step by step from the rated load. At the same load, the sensor unloads and loads the output difference, as show...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00
Inventor 朱向群张惠斌朱子健杨莉
Owner METTLER TOLEDO (CHANGZHOU) PRECISION INSTR CO LTD
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