Manufacturing method of iron-nickel-based alloy hot-rolled coiled plate

An iron-nickel-based alloy and a manufacturing method technology, applied in metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of narrow hot working process window, high thermal deformation activation energy, affecting yield, etc., and achieve stable The effect of mass production, improving production efficiency and reducing production costs

Active Publication Date: 2021-10-12
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]Because the iron-nickel-based alloy contains more alloying elements, solute segregation is easy to occur in the billet, and the deformation resistance at high temperature is large, and the activation energy of thermal deformation is high. The conditions for recrystallization in the process are harsh, and the addition of alloying elements and the precipitation of complex second phases also increase the brittleness, poor thermoplasticity of the alloy, and narrow thermal processing window
Therefore, for iron-nickel-based alloy coil products, traditionally, "die casting (billet opening) or slab continuous casting+steel rolling mill" is mainly used for rolling production, while modern hot continuous rolling with higher rolling efficiency is used. The unit rolls iron-nickel-based coils, which have the obvious advantages of high production efficiency and good coil surface quality, but hot-rolled coils are prone to edge cracks, which seriously affect the yield of finished products, and even cause waste products, resulting in large economic losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The "EAF+AOD+LF" method was used to smelt the NS1101 alloy, and then the vertical slab continuous casting machine was used for continuous casting to obtain a continuous casting slab with a cross-sectional specification of 1245×180mm. The surface of the continuous casting slab is ground, the grinding amount is 3.0%, and the thickness of the slab after grinding is 175mm.

[0047] The continuous casting slab is heated and kept warm by a walking heating furnace. The furnace temperature in the heating section is 1230°C, the furnace temperature in the soaking section is 1270°C, and the heating section and soaking section time are 95min. The oxygen content in the heating furnace is 2.5%, H 2 S content is 130mg / m 3 .

[0048] Use high-pressure dephosphorization equipment to remove the oxide skin on the surface of the slab, the dephosphorization pressure is 25MPa, and the main dephosphorization is 1 way.

[0049] 5 rough rolling passes, the rolling start temperature is 1160°C...

Embodiment 2

[0055] The "EAF+AOD+LF" method was used to smelt the NS1101 alloy, and then the vertical slab continuous casting machine was used for continuous casting to obtain a continuous casting slab with a cross-sectional specification of 1238×180mm. The surface of the continuous casting slab is ground, the grinding amount is 3.5%, and the thickness of the slab after grinding is 172mm.

[0056] The continuous casting slab is heated and kept warm by a walking heating furnace. The furnace temperature in the heating section is 1230°C, the furnace temperature in the soaking section is 1280°C, and the heating section and soaking section time are 100min. The oxygen content in the heating furnace is 2.3%, H 2 S content is 135mg / m 3 .

[0057] Use high-pressure dephosphorization equipment to remove the oxide skin on the surface of the slab, the dephosphorization pressure is 27MPa, and the main dephosphorization is 1 way.

[0058] 5 rough rolling passes, the rolling start temperature is 1150°...

Embodiment 3

[0064] The "EAF+AOD+LF" method was used to smelt the NS1101 alloy, and then the vertical slab continuous casting machine was used for continuous casting to obtain a continuous casting slab with a cross-sectional specification of 1238×160mm. The surface of the continuous casting slab is ground, the grinding amount is 4.0%, and the thickness of the slab after grinding is 153mm.

[0065] The continuous casting slab is heated and kept warm by a walking heating furnace. The furnace temperature in the heating section is 1250°C, the furnace temperature in the soaking section is 1280°C, and the heating section and soaking section time are 90min. The oxygen content in the heating furnace is 2.5%, H 2 S content is 138mg / m 3 .

[0066] Use high-pressure dephosphorization equipment to remove the oxide skin on the surface of the slab, the dephosphorization pressure is 29MPa, and the main dephosphorization is 1 way.

[0067] 5 rough rolling passes, the rolling start temperature is 1160°C...

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Abstract

The invention discloses a manufacturing method of an iron-nickel-based alloy hot-rolled coil plate. The manufacturing method comprises the following steps: (1) an iron-nickel-based alloy plate blank is loaded into a heating furnace and is sequentially treated by a heating section and a soaking section of the heating furnace, the furnace temperature of the heating section is 1200-1250 DEG C, and the furnace temperature of the soaking section is 1250-1290 DEG C; (2) the heated iron-nickel-based alloy plate blank is sequentially input into a rough rolling unit and a finish rolling unit to be subjected to five-pass rough rolling and seven-pass finish rolling, and a hot-rolled coiled plate is obtained; and (3) cooling and coiling are carried out on the hot-rolled coiled plate.

Description

technical field [0001] The invention relates to the technical field of manufacturing iron-nickel-based alloys, in particular, the invention relates to a method for manufacturing iron-nickel-based alloy hot-rolled coils. Background technique [0002] Because of its excellent comprehensive properties such as high temperature oxidation resistance and corrosion resistance, iron-nickel-based alloys are widely used in petrochemical, energy, heating and other fields. With the rapid development of industry, the demand for iron-nickel-based alloy products is also increasing. [0003] Since the iron-nickel-based alloy contains more alloying elements, the slab is prone to solute segregation, and the high-temperature deformation resistance is large, the activation energy of thermal deformation is high, and the conditions for recrystallization during thermal processing are harsh. At the same time, the addition of alloying elements and The complex precipitation of the second phase also i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/26B21B37/74B21B37/28B21B45/00
CPCB21B1/26B21B37/74B21B37/28B21B45/004
Inventor 李莎王贵平谷宇莫金强张威
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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