CN105256242A

CN105256242A - Manufacturing method for forge piece blanks for marine oil exploitation equipment

Info

Publication number: CN105256242A
Application number: CN201510684159.4A
Authority: CN
Inventors: 葛辉; 周勇
Original assignee: LYGM SUBSEA OIL EQUIPMENT TECH Co Ltd
Current assignee: Suzhou Regham Hengrui Energy Equipment Engineering Co ltd
Priority date: 2015-10-21
Filing date: 2015-10-21
Publication date: 2016-01-20
Anticipated expiration: 2035-10-21
Also published as: CN105256242B

Abstract

The invention discloses a manufacturing method for forge piece blanks for marine oil exploitation equipment. The method comprises the following steps that a, a proper number of raw materials is taken for forging blank forming; b, first-time rough machining is performed, c, preliminary ultrasonic flaw detection is performed, unqualified blanks are scrapped, and qualified blanks enter the next step; d, normalization is performed; e, preliminary hardness testing is performed; and f, second-time rough machining is performed so that qualified forge piece blanks used for next-step final heat treatment can be obtained.

Description

A kind of manufacture method of marine petroleum exploitation equipment forging blank

Technical field

The present invention relates to a kind of manufacture method of marine petroleum exploitation equipment forging blank.

Background technology

For the equipment of marine petroleum exploitation, owing to being chronically exposed in band damp atmosphere salty, usually damage because component are corroded.And these equipment are owing to being under continual working order, impact by repeated load, thus there is higher requirement to the hardness, intensity etc. of component, usually adopt the method for forging to manufacture workpiece.

Summary of the invention

Technical problem to be solved by this invention is: the manufacture method providing a kind of corrosion resistant marine petroleum exploitation equipment forging blank.

For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the manufacture method of marine petroleum exploitation equipment forging blank, comprises following technique step sequence:

A. getting composition by weight is: C:0.27 ~ 0.33%, Si:0.10 ~ 0.40%, Mn:0.65 ~ 1.05%, P :≤0.010%, S :≤0.010%, Cr:0.60 ~ 1.10%, Ni:0.60 ~ 0.99%, Mo:0.30 ~ 0.50%, Nb :≤0.04%, Al :≤0.03%, V :≤0.05%, all the other are Fe and other residual element; Every other residual element content add V, Al, Nb summation≤1.0% and wherein the base steel of H :≤1.6ppm be raw material, carry out forging base, initial forging temperature is not more than 1200 DEG C, final forging temperature is not less than 900 DEG C, Forge Heating holding temperature is 650 DEG C to 750 DEG C, pulling forging ratio >=26, forging in airtight stove by final forging temperature cool to room temperature.

B first time roughing: sawing is carried out to the blank after having forged, carries out first time roughing, the monolateral surplus staying 8-10mm.

The pre-test of c UT (Ultrasonic Testing), inspection product whether existing defects, as hole, shrinkage cavity etc., underproofly namely to scrap, qualified enters downstream.

D normalizing: temperature range: 900-955 DEG C, soaking time >=0.5T, T be workpiece with the maximum ga(u)ge value of inch gauge, then air cooling is to room temperature.

The first hardness test of e: carry out hardness test after normalizing completes, hardness value exceeds the scope of HBW269-330, again carries out normalizing flow process, until hardness determination is qualified.

F second time roughing: the monolateral surplus staying 4-6mm of second time roughing.

As preferred scheme, carry out UT (Ultrasonic Testing) and visit after second time roughing, inspection product whether existing defects, as hole, shrinkage cavity etc., and scraps unacceptable product.

As preferred scheme, at least arrange two contact thermocouples in described heat treatment furnace, one of them is arranged in the middle of stove, and another is arranged on the corner of stove.

As preferred scheme, timing when soaking time all reaches the temperature of setting from the temperature of patch thermocouple.

As preferred scheme, during normalizing, workpiece can only load one deck in heat treatment furnace.

The invention has the beneficial effects as follows: this manufacture method, by strict control to each steps such as blank raw material, forging process, normalizing process, guarantees the workpiece blank steady quality processed, good corrosion resistance, the environment for use that ocean etc. is severe can be applicable to.

Selected raw material has the feature of austenite and ferritic stainless steel concurrently, and intensity high and intergranular corrosion resistance and resistance to muriate stress corrosion are significantly improved.

Initial forging temperature is not more than 1200 DEG C, and final forging temperature is not less than 900 DEG C, and Forge Heating holding temperature is 650 DEG C to 750 DEG C, and to be that temperature owing to starting to forge is too high will produce the defects such as overheated, burning, decarburization and severe oxidation for this; Final forging temperature is too low, and the work hardening of metal is serious, and resistance to deformation sharply increases, and makes processing be difficult to carry out; And temperature is too low easily forges crackle.

Normalizing temperature is 900-955 DEG C, soaking time >=0.5T, T be workpiece with the maximum ga(u)ge value of inch gauge, grain refining and distribution of carbides homogenizing can be made, remove the internal stress of material.

At least arrange two contact thermocouples in heat treatment furnace, one of them is arranged in the middle of stove, and another is arranged on the corner of stove, can be comprehensively accurate to the detection of in-furnace temperature, prevents workpiece to be heated in stove inequality, affects the effect of heat treatment of workpieces.

Timing when soaking time all reaches the temperature of setting from the temperature of patch thermocouple, guarantees to be incubated duration, reaches good normalizing effect to make workpiece.

During normalizing, workpiece can only load one deck in heat treatment furnace, to guarantee that workpiece can obtain thermal treatment completely.

Embodiment

Specific embodiment of the invention scheme is described below.

The manufacture method of marine petroleum exploitation equipment forging blank, comprises following technique step sequence:

A. getting composition by weight is: C:0.27 ~ 0.33%, Si:0.10 ~ 0.40%, Mn:0.65 ~ 1.05%, P :≤0.010%, S :≤0.010%, Cr:0.60 ~ 1.10%, Ni:0.60 ~ 0.99%, Mo:0.30 ~ 0.50%, Nb :≤0.04%, Al :≤0.03%, V :≤0.05%, all the other are Fe and other residual element; Every other residual element content add V, Al, Nb summation≤1.0% and wherein the base steel of H :≤1.6ppm be raw material, carry out forging base, initial forging temperature is not more than 1200 DEG C, final forging temperature is not less than 900 DEG C, Forge Heating holding temperature is 700 DEG C, pulling forging ratio >=26, forging in airtight stove by final forging temperature cool to room temperature.

B first time roughing: sawing is carried out to the blank after having forged, carries out first time roughing, the monolateral surplus staying 10mm.

D normalizing: at least arrange two contact thermocouples in heat treatment furnace, one of them is arranged in the middle of stove, and another is arranged on the corner of stove.Workpiece can only load one deck in heat treatment furnace, temperature range: 940 DEG C, soaking time >=0.5T, T is that workpiece is with the maximum ga(u)ge value of inch gauge, then air cooling is to room temperature, timing when soaking time all reaches the temperature of setting from the temperature of patch thermocouple.

F second time roughing: the monolateral surplus staying 4mm of second time roughing.

G carries out UT (Ultrasonic Testing) and visits, and inspection product whether existing defects, as hole, shrinkage cavity etc.Qualified forging blank is used for next step finished heat treatment; Unacceptable product scraps process.

The above embodiments are the principle of illustrative the invention and effect thereof only, and the embodiment that part is used, but not for limiting the present invention; It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.

Claims

1. the manufacture method of marine petroleum exploitation equipment forging blank, comprises following technique step sequence:

The first hardness test of e: carry out hardness test after normalizing completes; If hardness value exceeds the scope of HBW269-330, again carry out normalizing flow process; Until hardness determination is qualified.

2. the manufacture method of marine petroleum exploitation equipment forging blank as claimed in claim 1, is characterized in that: after second time roughing, carry out UT (Ultrasonic Testing) visit, and inspection product whether existing defects, as hole, shrinkage cavity etc., and scraps unacceptable product.

3. the manufacture method of marine petroleum exploitation equipment forging blank as claimed in claim 1, is characterized in that: at least arrange two contact thermocouples in described heat treatment furnace, one of them is arranged in the middle of stove, and another is arranged on the corner of stove.

4. the manufacture method of marine petroleum exploitation equipment forging blank as claimed in claim 3, is characterized in that: timing when soaking time all reaches the temperature of setting from the temperature of patch thermocouple.

5. the manufacture method of the marine petroleum exploitation equipment forging blank according to any one of claim 1-4, it is characterized in that: during normalizing, workpiece can only load one deck in heat treatment furnace.