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A processing method for grain refinement of crnimov high pressure steel forgings

A technology of grain refinement and processing method, applied in the direction of improving process efficiency, can solve the problems of grass wave, grain size difference, performance difference, etc., and achieve fine grain size, economical production process and production efficiency. high effect

Active Publication Date: 2016-08-17
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems in the above-mentioned prior art of high-pressure steel forgings, such as grass-like waves, inconsistent grain size, and inconsistent performance, and provide a method to improve production efficiency by controlling the chemical composition of raw materials and changing the production process. A processing method for grain refinement of CrNiMoV high-pressure steel forgings that reduces production costs

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  • A processing method for grain refinement of crnimov high pressure steel forgings

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Embodiment Construction

[0026] A processing method for grain refinement of a CrNiMoV high-pressure steel forging, taking a 5-cylinder high-pressure steel forging as an example, the processing steps are as follows:

[0027] Step S01: Select grade-2 and 1000kg or above grade-2 steel scrap, nickel scrap, steel shavings, nickel-containing pig iron and sponge iron as electroslag ingots, use φ880 / φ940 crystallizers, and control the content of each element: C is 0.31 ~0.35%, Si 0.15~0.30%, Mn 0.50~0.65%, Ni 3.00~3.10%, Cr 0.90~1.00%, Mo 0.45~0.52%, Al 0.02~0.05%, V 0.05~ 0.10%, P not more than 0.015%, S not more than 0.010%, the five harmful elements Pb, As, Sn, Sb, and Bi are all less than 0.02%, and the amount of each element in the gas content is: [H] not more than 2.0ppm , [O] not greater than 30ppm, [N] not greater than 150ppm;

[0028] Step S02: heating the material selected in step S01 before forging to a temperature range of 1180-1210°C, and keeping it warm for 15 hours in this temperature range to...

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Abstract

The invention relates to a processing method for grain refinement of a CrNiMoV high pressure steel forging. The processing method is capable of improving comprehensive mechanical properties of the forging and comprises the following steps: step S01, using steel scrap of grade 2 or above grade 2, nickel remnants, steel cuttings, nickel-containing pig iron and spongy iron as electroslag ingots and controlling the content of each element; step S02, carrying out pre-forging heating on the materials selected in the step S01 to a temperature of 1180 to 1210 DEG C and maintaining the temperature for 15 h; step S03, carrying out wide-anvil compaction and temperature-controlled forging on the electroslag ingots heated in the step S02; step S04, carrying out preheat treatment on a forging obtained after forging in the step S03; and step S05, carrying out quenching on the forging having undergone preheat treatment and then carrying out tempering at a temperature of 600 + / - 10 DEG C. According to the processing method provided by the invention, production efficiency is improved and production cost is reduced through control of chemical composition of raw materials and changing of production technology.

Description

technical field [0001] The invention relates to the field of iron and steel material manufacturing process control, in particular to a grain refinement processing method for CrNiMoV high-pressure steel forgings for improving the comprehensive mechanical performance index of the forgings. Background technique [0002] At present, most of the CrNiMoV high-pressure steel forgings are produced by the following processes: electric furnace smelting, vacuum refining, electroslag remelting, hydraulic press upsetting, elongation, machining and quenching and tempering heat treatment. Due to the anvil width ratio and heat treatment in the forging process The process and alloy element control are unreasonable. In the production process, problems such as grass-like waves, inconsistent grain size, and performance are prone to occur, which greatly increases the failure rate of products, reduces production efficiency, and increases production costs. Contents of the invention [0003] The ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D6/00C22C38/46
CPCY02P10/20
Inventor 叶玉娟高全德孟祥顺薛正国
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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