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Manufacturing process of forging stock of steel forging piece for oil extraction equipment in deep sea

A manufacturing process and technology for steel forgings, which are applied in the field of manufacturing process of steel forging blanks for hydraulic cylinders of deep-sea oil production equipment, can solve the problems of inability to guarantee the quality of forgings after forming and forging, cracking of forging blank faces, edges and corners, and increasing forging difficulty. , to improve the malleability, ease the initiation, and slow down the cooling rate.

Active Publication Date: 2012-10-10
NANJING DEV ADVANCED MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, especially when forging hydraulic cylinder forgings with large cross-sections (540×378×152mm), due to the existence of high-temperature phase δ ferrite and the fast cooling speed of the corners of the forging billet, cracking on the face and corners of the forging billet is very easy to occur. , which greatly increases the difficulty of forging, and the quality of forging and forging cannot be guaranteed

Method used

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  • Manufacturing process of forging stock of steel forging piece for oil extraction equipment in deep sea
  • Manufacturing process of forging stock of steel forging piece for oil extraction equipment in deep sea
  • Manufacturing process of forging stock of steel forging piece for oil extraction equipment in deep sea

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Effect test

Embodiment

[0040] Embodiment (process number B): the forging process described in the present invention;

[0041] Repeated example (process number C): repeat the forging process described in the present invention.

[0042] The specific steps of the comparative example (process number A) are as follows:

[0043] Step A①: Precipitation-hardening martensitic stainless steel 15-5PH is composed of carbon, silicon, manganese, phosphorus, sulfur, chromium, nickel, copper and niobium, and its mass percentage is:

[0044] 0≤carbon≤0.07%, 0≤silicon≤1.00%, 0≤manganese≤1.00%, 0≤phosphorus≤0.035%, 0≤sulfur≤0.025%, 14.00%≤chromium≤15.50%, 4.00%≤nickel≤5.50% , 2.50≤copper≤4.00%, 0.15≤niobium≤0.45%,

[0045] Step A②: Select a square ingot according to the size of the required structural parts, heat it into the furnace to 1150°C, and then open the billet (square cross-section) along the length direction of the steel ingot on the free forging hammer. The final forging temperature is 900°C. Complete the i...

Embodiment （

[0052] Embodiment (process number B), concrete steps are as follows:

[0053] Step B①: Martensitic precipitation hardening stainless steel 15-5PH is composed of carbon, silicon, manganese, phosphorus, sulfur, chromium, nickel, copper and niobium, and the mass percentage of its standard value is calculated by the formulas (1) and (2) respectively Calculation of the highest chromium equivalent and nickel equivalent corresponding to a ferrite content exceeding 10% (see figure 2 The position pointed by the arrow K in the middle),

[0054] Step B②: According to Schaeffler organization chart (see attached figure 2 ) The chemical composition of the optimally designed martensitic precipitation hardening stainless steel 15-5PH, its mass percentage is:

[0055] 0.04≤carbon≤0.07%, 0≤silicon≤0.60%, 0.80≤manganese≤1.00%, 0≤phosphorus≤0.035%, 0≤sulphur≤0.025%, 14.00%≤chromium≤14.50%, 5.00%≤nickel≤5.50% , 2.50≤copper≤4.00%, 0.15≤niobium≤0.25%,

[0056] Calculate the ferrite amount corr...

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Abstract

The invention discloses a manufacturing process of a forging stock of a steel forging piece for oil extracting equipment in a deep sea, which comprises the following steps of: with martensite precipitation hardening type stainless steel as a steel forging piece material, selecting a square ingot, heating to 1180DEG C, cogging along the length direction of the steel ingot to obtain an octagonal section steel billet, wherein the forging ratio is 2.0-2.2; heating the octagonal section steel billet to 1040DEG C and preserving heat for 360 minutes; carrying out oil cooling below 32DEG C; taking anintermediate section as a billet; axially upsetting the billet from the initial forging temperature of 1150DEG C to the final forging temperature of 990DEG C; when the billet is upset to half of the height of the original billet, drawing out the octagonal section of the upset billet according to the original axial direction; axially upsetting when the billet is drawn to the length of the originalbillet; when the billet is upset to half of the height of the original billet, drawing out the octagonal section of the upset billet according to the original axial direction; when axially forging and shaping the billet when the billet is upset to half of the height of the original billet, enabling the total forging ratio to be 5.5 and obtaining a rectangular forging piece; and air cooling to be 340-360DEG C, carrying out furnace insulating for 120 minutes and then carrying out furnace cooling to the room temperature.

Description

technical field [0001] The invention belongs to a manufacturing process of steel forging blanks for hydraulic cylinders of deep-sea oil production equipment, and the manufacturing process is a combination of chemical composition optimization of hydraulic cylinder steels, forging processes and intermediate process heat treatment. 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,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J1/00C22C38/48
Inventor 张利徐元生
Owner NANJING DEV ADVANCED MFG
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