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Forging and heat treatment process of shell forge piece

A forging heating and forging technology, which is applied in the field of forging and heat treatment process of shell forgings used in petrochemical blowout preventers, can solve the problems of short service life and high forging cost, and achieve improved service life, hardenability and service life increased effect

Active Publication Date: 2019-04-16
无锡继平新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, the forging cost of the conversion flange forging is high and the service life is short

Method used

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  • Forging and heat treatment process of shell forge piece
  • Forging and heat treatment process of shell forge piece
  • Forging and heat treatment process of shell forge piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The forging process of embodiment 1 comprises:

[0058] Step 1. Melting the raw materials to obtain smelted steel ingots. Specifically, in step 1, the raw material is subjected to EF+LF+VD processing.

[0059] Step 2, forging and heating. Specifically, step 2 includes:

[0060] (1) Furnace loading; the furnace charging temperature before the steel ingot is forged and heated is 480°C.

[0061] (2) Heating; the heating rate is 135°C / H;

[0062] (3) heat preservation; heat preservation in stages. The thickness of the steel ingot is 900mm, the holding temperature in the first stage is 850°C, and the holding time is 4.5h. In the second stage, the temperature is raised to 1200°C, and the holding time is 5h.

[0063] Step 3, forging; the forging process includes two fire times.

[0064] The first firing time: the forging temperature is 1180°C; in the first firing time, the steel ingot is elongated, upset, elongated, and upset in sequence, and the total elongation ratio ...

Embodiment 2

[0080] The forging process of embodiment 2 comprises:

[0081] Step 1. Melting the raw materials to obtain smelted steel ingots. Specifically, in step 1, the raw material is subjected to EF+LF+VD processing.

[0082] Step 2, forging and heating. Specifically, step 2 includes:

[0083] (1) Furnace loading; the furnace charging temperature before the steel ingot is forged and heated is 420°C.

[0084] (2) Heating; the heating rate is 145°C / H;

[0085] (3) heat preservation; heat preservation in stages. The thickness of the steel ingot is 900mm, the holding temperature in the first stage is 850°C, and the holding time is 4.5h. In the second stage, the temperature is raised to 1200°C, and the holding time is 6h.

[0086] Step 3, forging; the forging process includes two fire times.

[0087] The first firing time: the forging temperature is 1170°C; in the first firing time, the steel ingot is drawn out, upset, drawn out, and upset in sequence, with a total drawing length rat...

Embodiment 3

[0103] The forging process of embodiment 3 comprises:

[0104] Step 1. Melting the raw materials to obtain smelted steel ingots. Specifically, in step 1, the raw material is subjected to EF+LF+VD processing.

[0105] Step 2, forging and heating. Specifically, step 2 includes:

[0106] (1) Furnace loading; the furnace charging temperature before the steel ingot is forged and heated is 400°C.

[0107] (2) Heating; heating rate 120°C / H;

[0108] (3) heat preservation; heat preservation is carried out in stages, and the thickness of the steel ingot is 900mm. In the first stage, the holding temperature is 850°C, and the holding time is 6 hours. In the second stage, the temperature is raised to 1200°C, and the holding time is 9 hours.

[0109] Step 3, forging; the forging process includes two fire times.

[0110] The first firing time: the forging temperature is 1200°C; in the first firing time, the steel ingot is drawn out, upset, drawn out, and upset in sequence; the total dr...

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Abstract

The invention relates to a forging and heat treatment process of a shell forge piece. The forging and heat treatment process of the shell forge piece comprises the following steps that 1, raw materials are smelted; 2, forging heating is carried out; 3, forging is carried out, and the forging process comprises two heating numbers; 4, heat treatment is carried out, specifically, (1) normalizing treatment is carried out after forging; (2) mechanical roughening is carried out on the forge piece; and (3) tempering is carried out; and 5, mechanical finishing is carried out on the forge piece. According to the forging and heat treatment process of the shell forge piece, the inner quality of the forge piece is improved by improving steel ingot components and texture and the forging process, grainsare refined, the whole mechanical performance is improved, and the non-uniformity is eliminated. According to the technical scheme, the service life of products is greatly prolonged by the produced forge piece, and the service life of the products can reach at least ten years.

Description

technical field [0001] The invention relates to a forging treatment process, in particular to a forging and heat treatment process for a casing forging for a petrochemical blowout preventer. Background technique [0002] The blowout preventer is a safety sealing wellhead device used to close the wellhead during oil testing, workover, well completion, etc., to prevent blowout accidents and to cut off the drill pipe in an emergency. During oil drilling, it is installed on the wellhead casing head to control the blowout device for high-pressure oil, gas and water. When using drilling pontoons and semi-submersible drilling platforms to drill wells at sea, because the drilling pontoons and platforms work in a floating state, there will be relative movement between the drilling wellhead and the subsea wellhead, and special parts that can be stretched and bent must be installed. However, because these components cannot withstand the high pressure during blowout shut-in or reverse ...

Claims

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Application Information

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IPC IPC(8): B21J5/00C21D1/28C21D1/25C21D9/00
CPCB21J5/002C21D1/25C21D1/28C21D9/0068
Inventor 张哲天张晶
Owner 无锡继平新材料科技有限公司
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