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Super duplex stainless steel ingot hot working cogging method

A duplex stainless steel and hot working technology, applied in the field of metallurgy, can solve the problems of high metallurgical manufacturing cost, low metal billet rate, long production cycle, etc., and achieve the effects of reduced metallurgical manufacturing cost, simple process and shortened production cycle.

Active Publication Date: 2015-02-25
浙江青山钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2507 large steel ingots are rare, and metallurgical mold ingots with a weight of less than 1.5t need to be forged for 4 to 8 fires to complete the 160 to 80mm 2 Hot processing of billets, long production cycle and high cost
Therefore, for a long time, the billet opening of ingots has mostly been completed by forging, the metal billet rate is low, and the metallurgical manufacturing cost is high

Method used

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  • Super duplex stainless steel ingot hot working cogging method
  • Super duplex stainless steel ingot hot working cogging method
  • Super duplex stainless steel ingot hot working cogging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A production method for hot-processing billeting of super duplex stainless steel ingots, using bell-type electric soaking furnace to heat steel ingots (ingot weight 0.75 tons) + preliminary rolling mill (850 rolling mill) for thermal processing billeting, and producing 2507 square meters Billet (140×140×5000mm).

[0025] During the first fire rolling of the blooming mill, the soaking furnace heats the steel ingot: (A) the furnace temperature of the steel ingot is ≤400°C, and the temperature is kept for 1.5 hours; (B) the temperature is raised to 760°C at a speed of 60°C / h for 3 hours, and Raise the temperature to 850°C and hold it for 1 hour; (C) raise the temperature to 1150°C at a rate of 80°C / h, turn over the steel ingot after holding it for 2 hours, and keep it for 1 hour; (D) heat it up to 1180°C at a rate of 100°C / h ℃, heat preservation ≥ 30 minutes, enter the blooming mill for the first fire rolling.

[0026] Hot processing blanking of the blooming mill: (A) Bef...

Embodiment 2

[0030] A production method for hot-processing billets of super duplex stainless steel ingots, using a bell-type electric soaking furnace to heat the steel ingots (ingot weight 1.5 tons) + preliminary rolling mill (850 rolling mill) for hot-processing billets, and producing 2507 cubic meters Billet (180×180×6000mm).

[0031] During the first fire rolling of the blooming mill, the soaking furnace heats the steel ingot: (A) the furnace temperature of the steel ingot is ≤400°C, and the temperature is kept for 2.5 hours; (B) the temperature is raised to 760°C at a speed of 60°C / h for 5 hours, and then Raise the temperature to 850°C and hold it for 2 hours; (C) raise the temperature to 1150°C at a rate of 80°C / h, turn over the steel ingot after holding it for 2.5 hours, and keep it for another 1.5 hours; (D) heat it up to 1180°C at a rate of 100°C / h ℃, heat preservation ≥ 60 minutes, enter the blooming mill for the first fire rolling.

[0032] Hot processing blanking of the bloomin...

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Abstract

The invention belongs to the metallurgical industry, and particularly relates to a super duplex stainless steel ingot hot working cogging method. The methods comprises hot working cogging first fire rolling and hot working cogging second fire rolling. The method comprises the steps of heating a steel ingot with a soaking pit, hot working cogging with a blooming mill, heating a rolled piece with the soaking pit, and hot working second fire cogging with the blooming mill. According to the super duplex stainless steel ingot hot working cogging method, a forging press is replaced by the blooming mill for hot working cogging, a qualified 2507 billet is rolled for being further rolled into a seamless tube circular tube billet, the problems of long production period and low metal cogging yield are solved, production cost of metallurgy manufacturing is greatly reduced, and user requirements and market demands are met.

Description

technical field [0001] The invention belongs to the metallurgical industry, and in particular relates to a production method for thermal processing and billeting of super duplex stainless steel ingots. Background technique [0002] 2507 belongs to the third generation of duplex stainless steel, called super duplex stainless steel, and has been included in stainless steel product standards such as ASTM A182 (S32750), ASTM A479 (S32750), EN 10272 (1.4410) and China GB / T 20878 (S25073) . 2507 has high strength and good toughness, has excellent pitting corrosion resistance (pitting corrosion equivalent PREN>40), stress corrosion resistance and crevice corrosion resistance, and shows excellent comprehensive performance. Its products are used in oil refining, petrochemical It is widely used in heat exchangers, coolers, evaporators and pipelines in chlor-alkali chemical industry, seawater environment, chemical fertilizer industry and other high-chlorine corrosion environments. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/02B21B37/74
Inventor 冯晓庭张亮胡梅青何金元
Owner 浙江青山钢铁有限公司
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