Heat treatment process of steel forging for hydraulic cylinder of deep-sea oil recovery equipment

A technology for hydraulic cylinders and steel forgings is applied in the field of heat treatment process for the performance of martensitic precipitation hardening stainless steel 15-5PH forgings to achieve the effects of improving microstructure, improving microstructure and stable heat treatment process.

Active Publication Date: 2011-11-23
NANJING DEV ADVANCED MFG
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, hydraulic cylinders used in offshore oil and gas production systems are manufactured with the performance heat treatment process of grade XM-12 (equivalent to 15-5PH) / H1075 state (1040°C solution treatment + 580°C aging treatment) in ASTM A564. and comprehensive mechanical properties are difficult to meet the requirements, and cannot be applied to harsh working conditions

Method used

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  • Heat treatment process of steel forging for hydraulic cylinder of deep-sea oil recovery equipment
  • Heat treatment process of steel forging for hydraulic cylinder of deep-sea oil recovery equipment
  • Heat treatment process of steel forging for hydraulic cylinder of deep-sea oil recovery equipment

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Embodiment 1

[0034] Embodiment 1 (Process No. B): the solution aging heat treatment process described in the present invention;

Embodiment 2

[0035] Example 2 (Process No. C): The solution aging heat treatment process described in the present invention.

[0036] The specific steps of the comparative example (process number A) are as follows:

[0037] Step A①: Put the 15-5PH hydraulic cylinder forging that has been roughly machined into a well-type resistance heating furnace and heat it to 1040±5°C, and keep it in this temperature range for 180 minutes (the holding time is calculated as 30 minutes per inch of the effective thickness of the forging ), the oil out of the furnace is cooled to below 32°C,

[0038] Step A②: Put the solution-treated hydraulic cylinder forging in step ① into a well-type resistance tempering furnace and heat it to 580±5°C, and keep it in this temperature range for 360 minutes (the holding time is calculated as 60 minutes per inch of the effective thickness of the forging. ), out of the oven and air-cooled to room temperature,

[0039] Step A③: Take a sample from the extended part of the hy...

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Abstract

The invention relates to a heat treatment process of a steel forging for a hydraulic cylinder of deep-sea oil recovery equipment, and the heat treatment process comprises the following steps: (1) selecting martensitic precipitation hardening stainless steel as a steel forging material of a 15-5PH hydraulic cylinder, wherein the martensitic precipitation hardening stainless steel comprises the following elements in percentage by weight: 0.04-0.07% of carbon, 0.001-0.60% of silicon, 0.80-1.00% of manganese, 14.00-14.50% of chromium, 5.00-5.50% of Ni, 2.50-4.00% of copper,0.15-0.25% of niobium, not more than 0.035% of phosphorus and not more than 0.025% of S, the chromium equivalent is 14.08-15.52% and the Ni equivalent is 6.60-8.10%; (2) heating the forging to 1060+ / -5 DEG C, carrying out heat preservation for 180 minutes, taking out the forging, and carrying out oil cooling on the forging until the temperature is lower than 32 DEG C; (3) heating the forging to 620+ / -5 DEG C, carrying out heat preservation for 360 minutes, taking out the forging, and air-cooling the forging to room temperature; (4) heating the treated forging processed in the step (3) of the hydraulic cylinder to 1040+ / -5 DEG C, carrying out heat preservation for 140 minutes, taking out the forging and carrying out oil cooling on the forging until the temperature of the forging is lower than 32 DEG C; and (5) heating the forging to 580+ / -5 DEG C, carrying out heat preservation for 360 minutes, taking out the forging and air-cooling the forging to room temperature.

Description

Technical field: [0001] The invention belongs to the technical field of production of steel forgings for hydraulic cylinders of deep-sea oil production equipment, and in particular relates to a performance heat treatment process for martensitic precipitation hardening stainless steel 15-5PH forgings. Background technique: [0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion). It has simple structure and reliable operation. When it is used to realize reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is stable, so it is widely used in various mechanical hydraulic systems. Hydraulic cylinders are also widely used in offshore oil and gas production systems, such as hydraulic pumping units for offshore oil production platforms, underwater pile clamps for offshore oil platforms, hydraulic cylinder deep-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/78C21D1/18C22C38/48
Inventor 张利徐元生
Owner NANJING DEV ADVANCED MFG
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