Hot rolling method of niobium-containing austenitic stainless steel profile

A niobium austenitic and stainless steel technology, which is applied in the field of hot rolling of niobium-containing austenitic stainless steel, can solve the problems of narrow thermal processing window, lower material thermoplasticity, and low production efficiency, and achieve good structure uniformity and good thermal perforation performance effect

Active Publication Date: 2022-06-21
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high content of Cr and Ni in this type of material, it is easy to form large niobium compounds during the solidification process, which reduces the thermoplasticity of the material and is very easy to crack during the hot rolling process. At present, this type of material mainly uses "steel ingot small Deformed multi-fire sub-diameter forging "process production, the process principle is to solve the problem of cracking in the hot rolling process caused by the narrow thermal processing window and high deformation resistance of this variety by reducing the amount of deformation in a single pass and increasing the number of fires
Compared with the conventional "ingot initial rolling + hot rolling" process, the internal structure of stainless steel processed by this process is uneven, the production efficiency is low, and the manufacturing cost is high

Method used

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  • Hot rolling method of niobium-containing austenitic stainless steel profile
  • Hot rolling method of niobium-containing austenitic stainless steel profile
  • Hot rolling method of niobium-containing austenitic stainless steel profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The elemental composition (% by weight) of the niobium-containing austenitic stainless steel of this embodiment is as follows:

[0080] Element C Si Mn P S Cr Ni Nb N content 0.05 0.21 0.76 0.024 0.001 25.1 20.3 0.40 0.26

[0081] In this embodiment, the ingot size is Φ440mm, and the target size is 150mm×150mm.

[0082] The hot rolling process of this embodiment is as follows:

[0083] 1. Ingot casting

[0084] Casting the refined molten steel into a round ingot, Dmax=440mm, Dmin=390mm, H=1820mm, the taper is 2.7%, and the volume ratio is 9%.

[0085] The columnar crystal structure of the ingot is figure 1 shown.

[0086] 2. Steel ingot heating: the target heating temperature is 1270℃, the holding time is 472min, and t1=300.

[0087] After heating, the columnar crystal structure of the ingot is as follows figure 2 shown.

[0088] 3. Billet rolling:

[0089] The start rolling temperature is 1140°C, the rolling process and...

Embodiment 2

[0093] The elemental composition (% by weight) of the niobium-containing austenitic stainless steel of this embodiment is as follows:

[0094] Element C Si Mn P S Cr Ni Nb N content 0.05 0.13 0.87 0.028 0.001 24.9 21.1 0.45 0.22

[0095] In this embodiment, the ingot size is Φ400mm, and the target bar size is Φ110mm.

[0096] The hot rolling process of this embodiment is as follows:

[0097] 1. Ingot casting

[0098] Cast the refined molten steel into a round ingot, Dmax=380mm, Dmin=362mm, H=1920mm, the taper is 0.94%, and the volume ratio is 8%.

[0099] 2. Steel ingot heating: target heating temperature 1250℃, holding time 400min, t1=220.

[0100] 3. Billet rolling:

[0101] The start rolling temperature is 1120°C, the rolling process and the finishing rolling temperature are 910°C. The single-pass reduction is controlled at 10-70mm. Overall compression ratio: 13.2. Finished product specification: Φ110mm bar.

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Abstract

The invention discloses a hot rolling method of a niobium-containing austenitic stainless steel profile. The hot rolling method sequentially comprises the following steps: (1) casting refined molten steel into a steel ingot with a preset size; (2) heating the steel ingot and preserving heat for a certain time; and (3) cogging and rolling the steel ingot according to the set parameters. According to the hot rolling method, the cracking problem of the niobium-containing austenitic stainless steel profile is solved, the product quality and the production efficiency are improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of iron and steel material processing, and in particular, the invention relates to a hot rolling method of niobium-containing austenitic stainless steel. Background technique [0002] In order to improve power generation efficiency and reduce emissions, the steam temperature and pressure parameters of coal-fired power plants are constantly improving. Traditional materials cannot meet the requirements of unit boilers, and a large number of high-performance niobium-containing austenitic stainless steel materials are needed. The addition of Nb element can precipitate nano-sized MX and NbCrN during the service process. These precipitates can be well dispersed in the matrix, hinder the movement of dislocations, improve the precipitation strengthening effect and creep resistance, and improve the austenitic stainless steel. high temperature resistance. However, due to the high content of Cr and Ni in this type of material, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46B21B37/00B21B37/74B22D7/00C22C38/00C22C38/02C22C38/04C22C38/48C22C38/58
CPCB21B1/463B21B37/74B21B37/00C22C38/02C22C38/04C22C38/58C22C38/48C22C38/001B22D7/00
Inventor 方旭东夏焱陈超张永亮
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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