Special forging method suitable for super duplex stainless steel bars

A duplex stainless steel, a special technology, applied in the direction of manufacturing tools, forging/pressing/hammer devices, heating/cooling equipment, etc., can solve the problems of large energy consumption, poor steel plasticity, and many times of forging fires, and achieve energy consumption Low cost, high production efficiency, and high material yield

Active Publication Date: 2016-06-22
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the forging interval of this steel is narrow. When the final forging temperature is lower than 900°C, the plasticity of the steel will deteriorate, and cracks will easily occur when forced forging
[0004] The existing forging process is "quick forging billet opening + radial forging finished product" or "quick forging billet opening + fast forging finished product", which has the following disadvantages: 1) many forging fires, large energy consumption, and low production efficiency of the unit; 2) fast forging Surface cracking is very easy to occur due to uneven distribution of stress and strain during the forging process

Method used

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  • Special forging method suitable for super duplex stainless steel bars
  • Special forging method suitable for super duplex stainless steel bars
  • Special forging method suitable for super duplex stainless steel bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A special forging process for super duplex stainless steel bars, comprising the following steps:

[0058] (1) Firstly, it is smelted by electric furnace + AOD furnace, and cast into a 3.0T steel ingot. The specifications of the steel ingot are: upper section 550mm×550mm, lower section 466mm×466mm, height 1675mm.

[0059] (2) Then the steel ingot is sent into the annealing furnace for stress relief annealing, the annealing temperature is 920°C, and the annealing time is 18h.

[0060] (3) The first fire time: heat the steel ingot in a chamber furnace, first raise the temperature to about 320°C, and keep it warm for 2.5h, then raise the temperature to about 1200°C at a speed of 80°C / h, and keep it warm for 4.5-5.5 h. After being out of the furnace, use a trackless discharge car to quickly clamp it out and transfer it to a 16MN radial forging machine. The initial forging temperature is 1100-1120°C. On the radial forging machine, the electric furnace ingot is forged into th...

Embodiment 2

[0080] This embodiment adopts the same raw materials and process parameters as in Embodiment 1, and the forged product is a Φ180mm bar, wherein the compression ratio from the steel ingot to the first intermediate billet is 1.8 (3.0t ingot is punched into a 430 round billet), and the first The compression ratio of the intermediate billet to the second intermediate billet obtained after fast forging and opening is 2.4 (from 430 round billet to 280 round billet), and the compression ratio from the second intermediate billet to the finished bar is 2.4 (from 430 round billet to 180 bars). The yield of this embodiment is 98%.

Embodiment 3

[0082] (1) First smelted by electric furnace + AOD furnace, die cast into 1.6T steel ingot, steel ingot specifications: upper section 470mm×470mm, lower section 360mm×360mm, height 1500mm, chemical composition is the same as Example 1, forging heating and initial forging and final forging The temperature is the same as in Example 1, but the forged product is a bar of Φ100mm, wherein the compression ratio from the steel ingot to the first intermediate billet is 1.95 (from the 1.6T ingot to the 360 ​​round billet), and after the first intermediate billet to the rapid forging billet opening The obtained second intermediate billet has a compression ratio of 3.56 (from a 360 round billet to a 180 round billet), and a compression ratio from the second intermediate billet to the finished rod is 3.24 (from a 180 round billet to a 100 round billet). The yield of this embodiment is 95%.

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Abstract

The invention belongs to the technical field of pressure machining and manufacturing and relates to a special forging method suitable for super duplex stainless steel bars. The novel special forging method suitable for the super duplex stainless steel bars is innovatively created with the advantages and disadvantages of radial forging machines and rapid forging presses fully considered and the characteristics of super duplex stainless steel considered. With steel ingots as raw materials, the method sequentially comprises the processes of radial forging and rapid forging combined blooming, radial forging finishing, air cooling and solution treatment. The yield of finished products of the super duplex stainless steel bars forged through the technology is high and is increased by more than 5% than the yield of original methods, the production efficiency is high, and the energy consumption is low. According to the method, the square or polygonal steel ingots with the section being 200-700*200-700 can be forged into the bars with Phi ranging from 60 mm to 400 mm.

Description

technical field [0001] The invention belongs to the technical field of pressure processing and manufacturing, and relates to a forging method, in particular to a special forging method suitable for super duplex stainless steel bars. Background technique [0002] Super duplex stainless steel is a new type of stainless steel mainly composed of ferrite phase and austenite phase. It combines the advantages of ferritic stainless steel and austenitic stainless steel. It has good corrosion resistance and high strength. Used in medium, especially the environment containing chloride ions, such as sea water, etc. [0003] However, for a long time, a major obstacle to the rapid promotion and application of this steel type is its poor thermoplasticity, and cracks are prone to appear in the production process of hot processing. The main reason is the different deformation behavior of austenite and ferrite phases during hot working. Due to the different softening process of the two phas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J1/04B21J1/06B21K29/00
CPCB21J1/04B21J1/06B21J5/008B21K29/00
Inventor 丁磊何燕平李博鹏张永强郭畅张军李造宇
Owner DAYE SPECIAL STEEL CO LTD
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