A kind of forging process of nitrogen-containing austenitic stainless steel

A technology of austenitic stainless steel and technology, which is applied in the field of metal forging technology, can solve the problems affecting the production progress and yield of materials, the production limitation of nitrogen-containing austenitic stainless steel, increasing the number of forging fires and production cycle, etc., so as to improve production The effects of processing efficiency, saving forging time, and reducing internal stress

Active Publication Date: 2020-07-28
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of nitrogen-containing austenitic stainless steel is subject to certain restrictions. One of the important factors is the thermal processing of nitrogen-containing austenitic stainless steel.
If the heat treatment process is not good, there will be precipitated phases at the grain boundaries of nitrogen-containing austenitic stainless steel, which will weaken the plasticity of the grain boundaries and cause forging cracks
In the hot forging process, due to the small forging temperature window, the optimal temperature range is 950-1170 °C. When the temperature is lower than this temperature range, the thermoplasticity of the material will be reduced. There will be forging cracking phenomenon, which seriously affects the production progress and yield of materials
Moreover, the temperature range is narrow, which reduces the forging time of each fire, increases the number of forging fires and the production cycle, and also increases the production cost and labor force.

Method used

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  • A kind of forging process of nitrogen-containing austenitic stainless steel
  • A kind of forging process of nitrogen-containing austenitic stainless steel
  • A kind of forging process of nitrogen-containing austenitic stainless steel

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: The specific forging process of the present nitrogen-containing austenitic stainless steel is as follows.

[0025] The forging material is nitrogen-containing austenitic stainless steel electroslag ingot, size: Φ300mm×450mm. Carry out heat treatment on the billet, the process is: heating up at 300℃ / h to 1000℃, holding for 1h; then heating up at 100℃ / h to 1150℃, holding for 15h; out of the furnace and air cooling. Put it into the heating furnace before the forging press, raise the temperature to 1160 ° C with the furnace, and keep it warm for 5 hours to ensure that the billet is heated through.

[0026] Preparatory work before forging, equipment and circuit inspection. According to the blank forging requirements, set the temperature range on the temperature control valve as 950-1170°C. During the initial forging, induction coils are used to preheat the base of the forging press to 150°C. At the beginning of forging, the temperature measuring device monit...

Embodiment 2

[0028] Embodiment 2: The specific forging process of the present nitrogen-containing austenitic stainless steel is as follows.

[0029] The forging material is a nitrogen-containing austenitic stainless steel forging blank, and its size is 150mm×150mm×200mm. Carry out heat treatment on the billet, the process is as follows: heat up at 250°C / h to 1020°C, hold for 1h; then heat up at 120°C / h to 1150°C, hold for 10h; leave the furnace and air cool. Put it into the heating furnace before the forging press, raise the temperature to 1150 ° C with the furnace, and keep it warm for 10 hours to ensure that the billet is thoroughly heated.

[0030] Preparatory work before forging, equipment and circuit inspection. According to the blank forging requirements, set the temperature range on the temperature control valve as 950-1170°C. During the initial forging, induction coils are used to preheat the base of the forging press to 200°C. At the beginning of forging, the temperature measur...

Embodiment 3

[0032] Embodiment 3: The specific forging process of the present nitrogen-containing austenitic stainless steel is as follows.

[0033] The forging material is nitrogen-containing austenitic stainless steel non-vacuum ingot, size: Φ220mm×200mm. Carry out heat treatment on the billet, the process is as follows: heating up at 220℃ / h to 1000℃, holding for 1.5h; then heating up at 130℃ / h to 1160℃, holding for 12h; out of the furnace and air cooling. Put it into the heating furnace before the forging press, raise the temperature to 1150 ° C with the furnace, and keep it warm for 8 hours to ensure that the billet is heated through.

[0034]Preparatory work before forging, equipment and circuit inspection. According to the blank forging requirements, set the temperature range on the temperature control valve as 950-1170°C. During the initial forging, induction coils are used to preheat the base of the forging press to 180°C. At the beginning of forging, the temperature measuring d...

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Abstract

The invention discloses a forging process of nitrogen-containing austenitic stainless steel. The forging process comprises a pre-forging heat treatment and forging process; the pre-forging heat treatment process comprises the following steps that a blank is heated to 980-1020 DEG C, and heat preservation is carried out for 1-1.5 hours; heating is carried out to 1140-1160 DEG C, and the heat preservation is carried out for 10-15 hours; and the forging process comprise the following steps that the multi-fire forging is adopted, a temperature compensation device of a forging machine is adopted for heating during forging, and the final forging temperature of each fire is controlled to be 950 DEG C or above. According to the process, the precipitation phase in the nitrogen-containing austeniticstainless steel is redissolved through the heat treatment process, the grain boundary embrittlement phase is reduced, and the forging cracking caused by weakening of the grain boundary is eliminated;the temperature compensation device is used for carrying out temperature compensation on a material, the uniformity of the temperature of a forge piece is increased according to the position of the faster temperature drop rate of the forge piece, and the internal stress generated due to the temperature difference of the forge piece can be effectively reduced; and meanwhile, the duration of each fire is improved, and the production and machining efficiency is improved.

Description

technical field [0001] The invention relates to a metal forging process, in particular to a nitrogen-containing austenitic stainless steel forging process. Background technique [0002] Nitrogen-containing austenitic stainless steel uses nitrogen instead of expensive metal nickel to stabilize the austenite phase region and reduce production costs. At the same time, nitrogen increases the strength of stainless steel through solid solution strengthening. Because of many advantages, nitrogen-containing austenitic stainless steel has broad prospects. However, the production of nitrogen-containing austenitic stainless steel is subject to certain restrictions, and one of the important factors is the hot working of nitrogen-containing austenitic stainless steel. If the heat treatment process is not good, there will be precipitated phases at the grain boundaries of nitrogen-containing austenitic stainless steel, which will weaken the plasticity of the grain boundaries and lead to f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K29/00C21D6/00
Inventor 常金宝赵英利张雲飞嵇爽李俊慧张坤
Owner HEBEI IRON AND STEEL
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