Steel for deep sea oil extraction equipment connector and manufacturing method for forge piece of steel

A steel forging and equipment technology, applied in the field of high-performance metal material processing, can solve the problems of loose materials, coarse grains, and inability to guarantee the service life of joints, etc., and achieve the effects of preventing quenching cracking and improving low-temperature toughness

Active Publication Date: 2017-11-07
ZHANGJIAGANG HAIGUO HEAVY FORGING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that the quality of our forgings cannot meet their product requirements. The main problems are that the mechanical properties are not satisfactory and there are defects such as looseness, micro-cracks, and coarse grains inside the material, which cannot guarantee the service life of the joints in deep-sea oil production equipment.

Method used

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  • Steel for deep sea oil extraction equipment connector and manufacturing method for forge piece of steel
  • Steel for deep sea oil extraction equipment connector and manufacturing method for forge piece of steel
  • Steel for deep sea oil extraction equipment connector and manufacturing method for forge piece of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) According to the size of the deep sea oil production equipment joint, select the appropriate steel blank. Described iron and steel material comprises each component of following mass percent (wt.%):

[0034]

[0035]

[0036] According to the size of the required structural parts, select the blank, and coat a layer of glass-like coating on the surface of the blank. The main component of the glass-like coating is (wt.%): 45% SiO 2 +5% Al 2 o 3 +9.5% Fe+0.5% A1+10% clay+30% water glass. Then enter the furnace and heat it to 1150°C for 3 hours to prepare for forging.

[0037] Coating a layer of glass-like coating on the surface of the steel material can effectively prevent the formation of scale on the surface of the steel material during the subsequent hot forging process, as well as the loss of carbon on the surface of the material during the forging process, making the composition of the steel material stable and its performance improved. Assure. The mass...

Embodiment 2

[0046] (1) According to the size of the deep sea oil production equipment joint, select the appropriate steel blank. Described iron and steel material comprises each component of following mass percent (wt.%):

[0047]

[0048] According to the size of the required structural parts, select the blank, and coat a layer of glass-like coating on the surface of the blank. The main component of the glass-like coating is (wt.%): 45% SiO 2 +5% Al 2 o 3 +9.5% Fe+0.5% Al+10% clay+30% water glass. Then enter the furnace and heat it to 1150°C for 3 hours to prepare for forging.

[0049] (2) The billet obtained in step (1) is first forged by free forging to obtain a forged billet; the initial forging temperature is 1150° C., the final forging temperature is 900° C., and the forging ratio is greater than 4:1.

[0050] (3) The primary billet obtained in step (2) is subjected to secondary forging by multi-directional die forging to obtain a secondary forging billet; the initial forging...

Embodiment 3

[0055] (1) According to the size of the deep sea oil production equipment joint, select the appropriate steel blank. Described iron and steel material comprises each component of following mass percent (wt.%):

[0056]

[0057] According to the size of the required structural parts, select the blank, and coat a layer of glass-like coating on the surface of the blank. The main component of the glass-like coating is (wt.%): 45% SiO 2 +5%Al 2 o 3 +9.5% Fe+0.5% Al+10% clay+30% water glass. Then enter the furnace and heat it to 1150°C for 3 hours to prepare for forging.

[0058] (2) The billet obtained in step (1) is first forged by free forging to obtain a forged billet; the initial forging temperature is 1150° C., the final forging temperature is 900° C., and the forging ratio is greater than 4:1.

[0059] (3) The primary billet obtained in step (2) is subjected to secondary forging by multi-directional die forging to obtain a secondary forging billet; the initial forging ...

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Abstract

The invention discloses steel for a deep sea oil extraction equipment connector and a manufacturing method for a forge piece of the steel. The manufacturing method comprises the following steps that special steel serves as a blank, the surface of the blank is coated with a layer of glass-like coating, then the blank is forged through a composite forging method combining free forging and multi-ram forging, and a secondary forge blank of the connector is obtained; normalization is conducted on the forge blank of the connector, and quenching heat treatment is conducted on the connector forge blank through a repeated water cooling-air cooling intermittent quenching process; and the quenched connector forge blank is subjected to secondary tempering treatment comprising the steps of tempering, air cooling, retempering and the second time of air cooling, and the steel forge piece of the deep sea oil extraction equipment connector. Through the combination of the forging process and the heat treatment process, quenching cracking of the complex-shape large forge piece is prevented effectively, the comprehensive mechanical performance, especially the low-temperature toughness, of the steel forge piece for the deep sea oil extraction equipment connector is improved substantially, and the steel forge piece can be suitable for a deep sea low-temperature operation condition environment very well.

Description

technical field [0001] The invention relates to a steel for deep sea oil production equipment joints and a manufacturing method thereof, which belongs to the field of high-performance metal material processing. Background technique [0002] Nanhai 982 belongs to deep-sea energy equipment manufacturing, representing a country's comprehensive strength and overall manufacturing technology level. Deep-sea equipment is in extremely harsh sea conditions such as high salt, high pressure, low temperature, and high impact all year round. Therefore, forging products are required to have high strength, corrosion resistance, pressure resistance, high toughness (especially low temperature toughness), strong impact resistance, and fatigue resistance. Strong comprehensive performance. my country's deep-sea oil production equipment technology research has just started, and currently the main oil production equipment basically relies on imports. The development of this product can replace ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/44C22C38/28C22C38/50C22C38/20C22C38/42C22C38/02C21D8/00B21J5/00
CPCB21J5/002C21D8/005C22C38/001C22C38/02C22C38/20C22C38/22C22C38/28C22C38/42C22C38/44C22C38/50
Inventor 盛雪华王章忠陈一凡巨佳张保森巴志新毛向阳张思斌
Owner ZHANGJIAGANG HAIGUO HEAVY FORGING
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