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Rolling and cogging method for OCr17Ni4Cu4Nb casting ingots

A production method and ingot casting technology, which is applied in the direction of metal rolling, can solve the problems of long production cycle and low metal billet rate, and achieve the effects of shortening the production cycle, high metal billet rate, and reducing metallurgical manufacturing costs

Active Publication Date: 2007-02-28
宝武特种冶金有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention develops a production method of rolling billets for OCr17Ni4Cu4Nb ingots, uses rolling mills instead of forging presses for thermal processing billets, and rolls OCr17Ni4Cu4Nb electroslag ingots into qualified billets, which solves the problem of martensitic precipitation hardening stainless steel Blade steel OCr17Ni4Cu4Nb has a long production cycle and low metal billet rate, which greatly reduces metallurgical manufacturing costs and meets user requirements and market needs

Method used

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  • Rolling and cogging method for OCr17Ni4Cu4Nb casting ingots

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Embodiment Construction

[0020] specific implementation plan

[0021] A certain iron and steel company implements the patent of the invention, adopts a soaking furnace to heat electroslag ingots (ingot weight 1.5-2.8 tons, 2.3 tons) + preliminary rolling mill (Φ800 rolling mill) hot-processed billet, and produces OCr17Ni4Cu4Nb steel billet (180 square meters m, 220 square mm). During the first fire rolling of the blooming mill, the electroslag ingot is heated by the soaking furnace: (A) the electroslag ingot (single weight 2 tons, 2.3 tons) is hot sent to the soaking furnace, the temperature of the steel ingot is 700°C, and the temperature is kept for 0.5 hours ; (B) heat up to 900°C at a rate of 50-60°C / h, and keep warm for 2 hours; (C) heat up to 1190°C at a speed of 100°C / h; (D) keep warm at 1190°C for 4 hours, and keep the steel ingot Turn over one by one to reduce the temperature difference between the positive and negative sides of the steel ingot; (E) The temperature difference between the neg...

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Abstract

A rolling cogging manufacturing method for 0Cr17Ni4Cu4Nb ingot casting includes: 1) heating in one heat, cooling steel ingot and keeping temperature for 1.5 hr when entering furnace temperature is less than or equal to 600deg.C; heating steel ingot, keeping temperature for 1 hr when entering furnace temperature is less than or equal to 690deg.C and keeping temperature for 2 hrs with is less than or equal to 60deg.C / h up to 950deg.C, keeping temperature for 4 hrs with is less than or equal to 80deg.C / h up to 1180deg.C and drawing charge with positive and positive and negative face temperature differential is less than or equal to 30deg.C; 2) cogging in one heat, roller preheating with rolling speed is less than or equal to 10 / min, beginning temperature is greater than or equal to 1150deg.C, finishing temperature is greater than or equal to 1050deg.C, drafts is less than or equal to 40mm and rolling passage is less than or equal to 14; 3) heating in second heat and keeping temperature for 1 hr at 1180deg.C; 4) cogging in second heat with beginning temperature is greater than or equal to 1130deg.C, finishing temperature is greater than or equal to 1000deg.C and drafts is less than or equal to 50mm, rapid shearing billet and hot annealing. It achieves low cost, simple process and good quality.

Description

Technical field [0001] The present invention relates to a hot-working blanking production method for precipitation-hardening stainless steel ingots in the metallurgical industry, and particularly refers to a hot-working blanking production method for martensitic precipitation-hardening stainless steel. Background technique [0002] Stainless steel can be divided into five major steel categories: martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel, and precipitation hardening stainless steel; martensite precipitation hardening stainless steel is a common precipitation hardening stainless steel, which is the A small, diffuse second phase is precipitated on the solid matrix, making the alloy reach high strength and high hardness. There are many such steel types that can be formed and processed in a softened or annealed state. OCr17Ni4Cu4Nb (17-4PH) is a martensitic precipitation hardening stainless steel developed in the Uni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00B21B1/00B21B3/00
Inventor 葛宪平沈燕源顾新根方静贤张龙祥王立荣王忠民
Owner 宝武特种冶金有限公司
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