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Hardening and tempering method for 12Cr13 stainless steel bar

A stainless steel bar, quenching and tempering technology, applied in the furnace type, furnace, heat treatment furnace and other directions, can solve the problems of high instantaneous heating energy consumption, high production cost, low production efficiency, etc. The effect of production efficiency

Active Publication Date: 2018-08-24
FUSHUN SPECIAL STEEL SHARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of 12Cr13 stainless steel in nuclear power plants has extremely high quality requirements. Under the premise of extreme high strength requirements, the 0°C impact toughness value is required to be not less than 40J. The 0°C impact value of domestically produced quenched and tempered 12Cr13 stainless steel bars is very high It is difficult to meet the requirements; and another technical difficulty of quenched and tempered 12Cr13 quenched and tempered bars is that the quenched and tempered bars are bent, and straightening + stress relief annealing is required, resulting in a further reduction in the impact value at 0 °C
As far as the existing technology at home and abroad is concerned, although there are many ways to manufacture 12Cr13 rods for driving rod raw materials, after quenching and tempering heat treatment, the impact toughness at 0°C cannot meet the requirement of not less than 40J
In order to solve the problem that the impact value cannot meet the standard after quenching and tempering, a French company specializing in the production of nuclear power drive rods adopts continuous induction furnace quenching and tempering, so that the mechanical properties of the drive rod meet the requirements of the standard, but the continuous induction furnace quenching and tempering method is due to instantaneous heating. High energy consumption and small capacity for heat-treated bars lead to very high production costs and low production efficiency

Method used

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  • Hardening and tempering method for 12Cr13 stainless steel bar
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  • Hardening and tempering method for 12Cr13 stainless steel bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Steel ingot smelting process

[0056] The chemical composition of the electroslag ingot is shown in Table 3.

[0057] 2. Steel ingot rolling process

[0058] The rolled product size is ф30mm bar.

[0059] 3. Incomplete pre-annealing + quenching + tempering heat treatment for finished bars

[0060] The first step: the finished bar is incompletely annealed in a 9# chamber furnace, the annealing temperature is 760°C, the holding temperature deviation is ±10°C, and the heat preservation is for 16h, and then slowly cooled to 620°C to 628°C at a speed of no more than 50°C / h ℃ out of the oven, air-cooled.

[0061] Step 2: The bar after incomplete pre-annealing is quenched and heat-treated in a continuous furnace, the quenching temperature is 930°C, the holding temperature deviation is ±10°C, and the holding time is 1h40min;

[0062] The third step: the quenching of the bar is cooled by water-air alternate time control method, the surface temperature of the bar is not hi...

Embodiment 2

[0071] 1. Steel ingot smelting process

[0072] The chemical composition of the electroslag ingot is shown in Table 3.

[0073] 2. Steel ingot rolling process

[0074] Rolled product size ф50mm bar.

[0075] 3. Incomplete pre-annealing + quenching + tempering heat treatment for finished bars

[0076] Step 1: The finished bar is incompletely annealed in a 7# chamber furnace, the annealing temperature is 760°C, the holding temperature deviation is ±10°C, and the holding time is 18h, and then slowly cooled to 630°C at a speed of no more than 60°C / h and released from the furnace. air cooled.

[0077] Step 2: The bar after incomplete pre-annealing is quenched and heat-treated in a continuous furnace, the quenching temperature is 930°C, the holding temperature deviation is ±10°C, and the holding time is 2.5h;

[0078] The third step: the quenching of the bar is cooled by water-air alternating time control method, the surface temperature of the bar is not higher than 280 ℃, and a...

Embodiment 3

[0087] 1. Steel ingot smelting process

[0088] The chemical composition of the electroslag ingot is shown in Table 3.

[0089] 2. Steel ingot rolling process

[0090] Rolled product size ф75mm bar.

[0091] 3. Incomplete pre-annealing + quenching + tempering heat treatment for finished bars

[0092] Step 1: The finished bar is incompletely annealed in a 7# chamber furnace, the annealing temperature is 760°C, the holding temperature deviation is ±10°C, and the holding time is 18h, and then slowly cooled to 630°C at a speed of no more than 60°C / h and released from the furnace. air cooled.

[0093] Step 2: The bar after incomplete pre-annealing is quenched and heat-treated in a continuous furnace, the quenching temperature is 930°C, the holding temperature deviation is ±10°C, and the holding time is 2.5h;

[0094] The third step: the quenching of the bar is cooled by water-air alternate time control method, the surface temperature of the bar is not higher than 260 ℃, and air...

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Abstract

The invention discloses a hardening and tempering method for a 12Cr13 stainless steel bar and aims to provide a method which guarantees the mechanical properties, also lowers the production cost and improves the production efficiency. The hardening and tempering method disclosed by the invention is characterized in that a thermal treatment process for hardening and tempering is optimized, namely an incomplete annealing pretreatment process is added before hardening and tempering, subsequently a desk type furnace / a continuous heating furnace is used for carrying out (hardening + tempering) hardening and tempering, straightening and stress relief annealing, wherein the 0-DEG-C impact value of the bar after straightening and stress relief annealing is not large in change; and finally the mechanical properties of the 12Cr13 bar totally meet the standard requirements of nuclear power materials. By using the hardening and tempering method disclosed by the invention, even a traditional heating furnace is adopted for carrying out hardening and tempering treatment on the bar, the mechanical properties can still meet the requirements of the standard nuclear power hardened and tempered 12Cr13, especially the o-DEG-C impact value is quite large in increment range and the numerical value fluctuates stably; after thermal treatment, the deviation of the hardness (HBW) of the overall bar is not larger than 15; the thermal treatment cost is lowered; and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular relates to a quenching and tempering method for 12Cr13 stainless steel rods. Background technique [0002] 12Cr13 belongs to martensitic stainless steel. After quenching and tempering, it can obtain high strength, toughness and good machinability. It is suitable for manufacturing parts with medium strength and high toughness to withstand impact loads. In recent years, the driving rods for driving mechanisms of nuclear power plants at home and abroad, and the fastener parts for nuclear power plants are all made of quenched and tempered 12Cr13 stainless steel. The driving rod is one of the key components of nuclear power plant reactors. Reliable up and down movement to control insertion or withdrawal of fuel control rods. The application of 12Cr13 stainless steel in nuclear power plants has extremely high quality requirements. Under the premise of extrem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/26C21D1/18C21D1/30C22C38/40C22C38/04C22C38/02
CPCC21D1/18C21D1/26C21D1/30C21D9/0075C22C38/02C22C38/04C22C38/40
Inventor 卢伦秋立鹏王继红赵艳孙利军陈德利张丽娜齐越苏东起韩志远谭庆丰李骥叶强
Owner FUSHUN SPECIAL STEEL SHARES
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