CN105256242B

CN105256242B - A kind of manufacture method of marine petroleum exploitation equipment forging blank

Info

Publication number: CN105256242B
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: 2017-07-07
Anticipated expiration: 2035-10-21
Also published as: CN105256242A

Abstract

The invention discloses a kind of manufacture method of corrosion resistant marine petroleum exploitation equipment forging blank, including following technique step sequence：A. taking suitable raw material carries out forging base, and b first time roughing, c ultrasonic examination pre-tests are underproof to scrap, qualified entrance downstream, d normalizings, the first hardness tests of e, second roughing of f, you can obtain qualified forging blank, in case next step finished heat treatment is used.

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, in being chronically exposed to humid air salty, usually because of zero Part is corroded and damages.And these equipment are impacted due to being under continual working condition by alternate load, because And hardness, intensity to parts etc. has requirement higher, usually using the method manufacture workpiece of forging.

The content of the invention

The technical problems to be solved by the invention are：A kind of corrosion resistant marine petroleum exploitation equipment forging blank is provided Manufacture method.

In order to solve the above technical problems, the technical solution adopted in the present invention is：Marine petroleum exploitation equipment forging hair The manufacture method of base, including following technique step sequence：

A. taking 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%, remaining is Fe and other residual elements；Every other residual element content is added Summation≤1.0% of V, Al, Nb and wherein H：The base steel of≤1.6ppm is raw material, carries out forging base, and initial forging temperature is not more than 1200 DEG C, final forging temperature is not less than 900 DEG C, and Forge Heating holding temperature is 650 DEG C to 750 DEG C, pulls out forging ratio >=26, forging Room temperature is cooled to by final forging temperature in closed stove.

B first time roughing：Sawing is carried out to the blank after the completion of forging, first time roughing is carried out, it is unilateral to stay 8- The surplus of 10mm.

C ultrasonic examination pre-tests, inspection product whether there is defect, and such as hole, shrinkage cavity is underproof to scrap, and closes The entrance downstream of lattice.

D normalizings：Temperature range：900-955 DEG C, soaking time >=0.5T, soaking time is complete from the temperature of patch thermocouple Portion starts timing when reaching the temperature of setting, T is the maximum gauge value that workpiece is measured in inches, is then air cooled to room temperature.

The first hardness tests of e：Hardness test is carried out after the completion of normalizing, hardness number exceeds the scope of HBW269-330, again Normalizing flow is carried out, until hardness determination is qualified.

Second roughing of f：Second roughing is unilateral to stay the surplus of 4-6mm；Carry out ultrasonic examination to visit again, inspection is produced Product whether there is defect, such as hole, shrinkage cavity, and defective work is scrapped.

It is one of to set at least provided with two contact thermocouples in the heat treatment furnace as preferred scheme Between in a furnace, another is arranged on the corner of stove.

Used as preferred scheme, during normalizing, workpiece can only load one layer in heat treatment furnace.

The beneficial effects of the invention are as follows：This manufacture method is by each step such as blank raw material, forging technology, normalizing process Strict control ensure the workpiece blank steady quality for processing, good corrosion resistance can be suitably used for the severe use such as ocean Environment.

The characteristics of selected raw material has austenite and ferritic stainless steel concurrently, intensity is high and intergranular corrosion resistance and resistance to chloride should Power corrosion is 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, this is that the temperature of forging is too high will to produce the defects such as overheat, burning, decarburization and severe oxidation due to starting；Final forging temperature Too low, the processing hardening of metal is serious, and resistance of deformation is sharply increased, 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, and T is the maximum gauge value measured in inches of workpiece, can be with Crystal grain refinement and distribution of carbides are homogenized, the internal stress of material is removed.

At least provided with two contact thermocouples in heat treatment furnace, one of them is arranged in the middle of stove, and another sets The corner in stove is put, can be comprehensively accurate to the detection of in-furnace temperature, prevent workpiece to be heated in stove inequality, influence workpiece heat The effect for the treatment of.

Soaking time when the temperature of patch thermocouple entirely reaches the temperature of setting timing, it is ensured that insulation duration, So that workpiece reaches preferable normalizing effect.

During normalizing, workpiece can only load one layer in heat treatment furnace, to ensure that workpiece can be completely heat-treated.

Specific embodiment

Specific embodiments of the present invention are described below.

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

A. taking 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%, remaining is Fe and other residual elements；Every other residual element content is added Summation≤1.0% of V, Al, Nb and wherein H：The base steel of≤1.6ppm is raw material, carries out forging base, and initial forging temperature is not more than 1200 DEG C, final forging temperature is not less than 900 DEG C, and Forge Heating holding temperature is 700 DEG C, pulls out forging ratio >=26, and forging is closed Stove in room temperature is cooled to by final forging temperature.

B first time roughing：Sawing is carried out to the blank after the completion of forging, first time roughing is carried out, it is unilateral to stay 10mm Surplus.

D normalizings：At least provided with two contact thermocouples in heat treatment furnace, one of them is arranged in the middle of stove, separately One corner for being arranged on stove.Workpiece can only load one layer, temperature range in heat treatment furnace：940 DEG C, soaking time >=0.5T, T are the maximum gauge value that workpiece is measured in inches, are then air cooled to room temperature, temperature of the soaking time from patch thermocouple Degree starts timing when entirely reaching the temperature of setting.

Second roughing of f：Second roughing is unilateral to stay the surplus of 4mm.

G carries out ultrasonic examination and visits again, and inspection product whether there is defect, such as hole, shrinkage cavity.Qualified forging blank Standby next step finished heat treatment is used；Defective work scraps treatment.

The principle and its effect of the above embodiments only illustrative the invention, and the implementation that part uses Example, not for the limitation present invention；It should be pointed out that for the person of ordinary skill of the art, not departing from wound of the present invention On the premise of making design, various modifications and improvements can be made, these belong to protection scope of the present invention.

Claims

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

A. taking 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%, remaining is Fe and other residual elements；Every other residual element content is added Summation≤1.0% of V, Al, Nb and wherein H：The base steel of≤1.6ppm is raw material, carries out forging base, and initial forging temperature is not more than 1200 DEG C, final forging temperature is not less than 900 DEG C, and Forge Heating holding temperature is 650 DEG C to 750 DEG C, pulls out forging ratio >=26, forging Room temperature is cooled to by final forging temperature in closed stove；

B first time roughing：Sawing is carried out to the blank after the completion of forging, first time roughing is carried out, it is unilateral to stay 8-10mm's Surplus；

C ultrasonic examination pre-tests, inspection product whether there is defect, underproof to scrap, qualified entrance downstream；

D normalizings：At least provided with two contact thermocouples in heat treatment furnace, one of them is arranged in the middle of stove, another The corner of stove is arranged on, workpiece can only load one layer, temperature range in heat treatment furnace：900-955 DEG C, soaking time >=0.5T, T are the maximum gauge value that workpiece is measured in inches, and soaking time entirely reaches setting from the temperature of patch thermocouple Start timing during temperature, be then air cooled to room temperature；

The first hardness tests of e：Hardness test is carried out after the completion of normalizing；If hardness number exceeds the scope of HBW269-330, again Carry out normalizing flow；Until hardness determination is qualified；

Second roughing of f：Second roughing is unilateral to stay the surplus of 4-6mm；Carry out ultrasonic examination to visit again, inspection product is No existing defects, and defective work is scrapped.