Rolling and cogging method for OCr17Ni4Cu4Nb casting ingots

A production method and ingot casting technology, applied in the direction of metal rolling, etc., 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: 2005-02-23
宝武特种冶金有限公司
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Problems solved by technology

[0005] The present invention develops a production method of rolling billets for 0Cr17Ni4Cu4Nb ingots, uses rolling mills instead of forging presses for thermal processing billets, and rolls 0Cr17Ni4Cu4Nb electroslag ingots into qualified billets, sol

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  • Rolling and cogging method for OCr17Ni4Cu4Nb casting ingots
  • Rolling and cogging method for OCr17Ni4Cu4Nb casting ingots

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[0020] Specific implementation plan

[0021] An iron and steel company implemented the patent of the present invention, using a soaking furnace to heat electroslag ingots (ingots weighing 1.5 to 2.8 tons, 2.3 tons) + blooming mill (Φ800 rolling mill) hot-processed billet rolled by two fires to produce 0Cr17Ni4Cu4Nb billets (180 square meters) mm, 220 square mm). During the first-fire rolling of the blooming mill, the soaking furnace heats the electroslag ingot: (A) The electroslag ingot (single weight is 2 tons, 2.3 tons) is the hot delivery soaking furnace, the ingot entering temperature is 700 ℃, and the heat preservation is 0.5 hours (B) Raise the temperature to 900°C at a rate of 50~60°C / h and keep it for 2 hours; (C) Raise the temperature to 1190°C at a rate of 100°C / h; (D) Keep the steel ingot at 1190°C for 4 hours. 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 ...

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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 invention relates to a production method for thermal processing of precipitation-hardening stainless steel ingots in the metallurgical industry, in particular to a production method for thermal processing of 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; martensitic precipitation-hardening stainless steel is a common precipitation-hardening stainless steel. The fine and diffuse second phase is precipitated on the body matrix, which makes the alloy achieve high strength and high hardness. There are many types of steel of this type that can be formed in a softened or annealed state. 0Cr17Ni4Cu4Nb (17-4PH) is a martensitic precipitation hardening stainless steel developed in the United States in 1946. I...

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Application Information

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IPC IPC(8): B21B1/00B21B3/00C21D8/00
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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