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Method for rolling seamless steel pipe from die-casting hollow steel ingot

A seamless steel pipe and hollow steel technology, applied in the field of metallurgy, can solve the problems of seamless steel pipes without die-casting hollow steel ingots, and achieve the effects of large-scale production, expansion of production varieties, and easy heating

Inactive Publication Date: 2011-09-14
攀钢集团成都钢铁有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is no relevant report on the use of die-cast hollow steel ingots to roll seamless steel pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 P22 steel grade die-casting hollow steel ingot adopts the method of the present invention to roll seamless steel pipe

[0027] Rolling specifications: φ480×22.5, φ457.2×33

[0028] Production process flow: die-casting hollow steel ingots → ring furnace heating → piercing machine extension → periodic tube rolling → steel tube finishing → packaging and storage.

[0029] Process parameters of each process: ring furnace heating temperature control: ring furnace cycle production, first use the residual heat in the furnace to gradually raise the temperature of the ingot (time is 1.5 hours), the temperature settings of the 6-stage heating treatment are: preheating stage 1, 1080 ℃ ~1150℃(heating time 1.5 hours), preheating stage II 1180℃~1240℃(heating time 2.0 hours), heating stage I 1240℃~1260℃(heating time 1.5 hours), heating stage II 1250℃~1280℃( Heating time 2.0 hours), soaking stage I 1270°C~1280°C (heating time 1.5 hours), soaking stage II 1270°C~1280°C (heating time ...

Embodiment 2

[0031] Example 2 The 27SiMn steel grade die-casting hollow steel ingot was used to roll seamless steel pipes using the method of the present invention

[0032] Rolling specifications: φ396×60, φ457×45

[0033] Production process flow: die-casting hollow steel ingots → ring furnace heating → piercing machine extension → periodic tube rolling → steel tube finishing → packaging and storage.

[0034] Process parameters of each process: ring furnace heating temperature control: ring furnace cycle production, first use the residual heat in the furnace to gradually raise the temperature of the ingot (time is 2.0 hours), the temperature settings of the 6-stage heating treatment are: preheating section 1, 1080 ℃ ~1140℃(heating time 2.0 hours), preheating stage II 1180℃~1230℃(heating time 2.0 hours), heating stage I 1240℃~1250℃(heating time 1.5 hours), heating stage II 1250℃~1270℃( Heating time 1.0 hour), soaking stage I 1260°C~1270°C (heating time 1.5 hours), soaking stage II 1260°C~1270°C (...

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PUM

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Abstract

The invention relates to a method using a hollow ingot to roll a seamless steel pipe, belonging to the metallurgy field. A technical problem to be solved is to provide the method using the hollow ingot to roll the seamless steel pipe. The method has the advantages of simple process and low cost. The method using the hollow ingot to roll the seamless steel pipe comprises steps of ingot heating, ingot extension, pipe rolling, mill sizing and pipe finishing. With wide application prospect, the method using the hollow ingot to roll the seamless steel pipe greatly lowers the infolding rate of products and improves the rate of finished products.

Description

Technical field [0001] The invention relates to a method for rolling seamless steel pipes by die casting hollow steel ingots, and belongs to the field of metallurgy. Background technique [0002] Rolled seamless steel pipes generally use continuous casting billets, rolled (or forged) billets, and die-cast steel ingots. A few stainless steel high-alloy steel varieties also use centrifugal cast steel ingots. The basic deformation process of rolling tube is "steel ingot heating → piercing → tube rolling → sizing → finished product". Among them, the steel ingot heating process is carried out in the ring furnace, and the appropriate heating system is adopted according to the different steel types and ingot types; the piercing process has two processes: cross-rolling piercing and pressure punching + extension. These two piercing processes affect the tube blank The requirements are different. [0003] The process steps of the pressure punching + extension process are: steel ingot → heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06B21B37/74
Inventor 吴红郭元蓉边华川詹勇
Owner 攀钢集团成都钢铁有限责任公司