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A method for refining grains by high-temperature forging of large stainless steel rings

A technology for stainless steel ring and grain refinement, applied in the field of forging technology, can solve the problems of insufficient equipment capacity, mixed grains, coarse grains of stainless steel, etc., to improve toughness and quality, and to solve the effects of coarse grains and grain refinement.

Active Publication Date: 2020-07-28
WUXI PAIKE HEAVY CASTING & FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the shortcomings in the above-mentioned existing production technology, the applicant provides a method for refining grains of large stainless steel rings at high temperature. By increasing the rolling temperature and reducing the deformation resistance of the material, the stainless steel rings can be realized under certain deformation conditions. The grain refinement of parts not only overcomes the problem of insufficient equipment capacity, but also solves the problem of coarse grain and mixed crystal of stainless steel, making the grain size reach 6-7

Method used

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Experimental program
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Effect test

specific Embodiment approach

[0022] The high-temperature forging method for refining large-scale stainless steel rings in this embodiment includes the following steps:

[0023] Step 1: Heating the ingot:

[0024] The first stage: set the furnace temperature to ≤400°C, heat the stainless steel ingot into the furnace, and heat it up to 850°C-900°C within 5-7 hours after the ingot is put into the furnace, and keep it warm for 5-7h;

[0025] The second stage: After continuing to heat up to 1230°C-1280°C in the next 3-4h, keep warm for 5-7h;

[0026] Step 2: Forging: Upsetting and punching the ingot after heating in Step 1;

[0027] Step 3: Return the hot material to the furnace: return the forging in step 2 to the furnace for heating at a heating temperature of 1230°C-1280°C, keep it warm for 2-3 hours, and then release it from the furnace;

[0028] Step 4: ring rolling: ring rolling the forged piece after returning to the furnace in step 3, so that the deformation of each part of the ring piece is ≥ 40%; ...

Embodiment 1

[0035] A method for refining grains by high-temperature forging of a large stainless steel ring in this embodiment, the specific process steps are as follows:

[0036] Step 1: Heating the ingot:

[0037] The first stage: set the furnace temperature to ≤400°C, heat 8 tons of stainless steel ingots into the furnace, heat them up to 850°C within 5-7 hours after the ingots are put into the furnace, and keep them warm for 6 hours;

[0038] The second stage: continue to heat up to 1260°C within the next 3-4h, and keep warm for 5h;

[0039] Step 2: Forging: Upsetting and punching the ingot after heating in Step 1 to ensure that the initial temperature is >1200°C and the termination temperature is ≥850°C. The size of the forging after forging is: Φ1500×Φ380×590;

[0040] Step 3: Return the hot material to the furnace: return the forging in step 2 to the furnace for heating at a heating temperature of 1260°C, keep it warm for 2-3 hours, and then release it from the furnace;

[0041] ...

Embodiment 2

[0046] A method for refining grains by high-temperature forging of a large stainless steel ring in this embodiment, the specific process steps are as follows:

[0047] Step 1: Heating the ingot:

[0048] The first stage: set the furnace temperature to ≤400°C, heat 8 tons of stainless steel ingots into the furnace, heat up to 900°C within 5-7 hours after the ingots are put into the furnace, and keep the temperature for 5 hours;

[0049] The second stage: continue to heat up to 1280°C within the next 3-4h, and keep warm for 5h;

[0050] Step 2: Forging: Upsetting and punching the ingot after heating in Step 1 to ensure that the initial temperature is >1200°C and the termination temperature is ≥850°C. The size of the forging after forging is: Φ1500×Φ380×590;

[0051] Step 3: Return the hot material to the furnace: return the forging in step 2 to the furnace for heating at a heating temperature of 1280°C, keep it warm for 2-3 hours, and then release it from the furnace;

[0052]...

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Abstract

The invention relates to a high-temperature forging and grain refining method for large stainless-steel ring parts. The method adopts a method of forging, punching and high-temperature large deformation ring rolling, the stainless steel crystal grains are subjected to large deformation at high temperature (1230 DEG C-1280 DEG C) (the deformation of each part of the ring parts is greater than or equal to 40%), and the uniformly refined grains are obtained. After the forging is completed, the ring part is rapidly water-cooled to room temperature, and the stainless-steel ring part having a grainsize of 6-7 grade is obtained, and the prior art requirement is greater than or equal to 4, thereby the grain size is greatly improved. The method is beneficial to improve the toughness and quality ofthe stainless steel ring part; at the same time, the method overcomes the problem that the low-temperature deformation forging in the prior art leads to insufficient rolling force of the equipment, the method requires multiple forgings so that the process are complicated, and low productivity and good yield are low.

Description

technical field [0001] The invention relates to the technical field of forging technology, in particular to a method for refining crystal grains by high-temperature forging of large stainless steel rings. Background technique [0002] In the production process, due to the interference of various external factors such as personnel, equipment, and the environment, stainless steel is prone to coarse crystals and mixed crystals during the forging process. Since there is no suitable method to solve the problem of coarse crystals and mixed crystals in stainless steel ring billets, Usually only low-temperature forging can be used in reproduction (under the condition of low-temperature heating and heat preservation, the grains of stainless steel are not easy to grow). Hole, the hot material is returned to the furnace, heated to 1100°C-1150°C, and the hole is reamed on a horse frame, so that the inner and outer diameters of the ring blank are increased, the wall thickness is reduced,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/13C21D9/40
CPCC21D7/13C21D9/40
Inventor 刘其源刘智王骏许亮陈翠
Owner WUXI PAIKE HEAVY CASTING & FORGING