CN106734327A - A kind of moulding process of admirality brass seamless pipe - Google Patents
A kind of moulding process of admirality brass seamless pipe Download PDFInfo
- Publication number
- CN106734327A CN106734327A CN201611042735.6A CN201611042735A CN106734327A CN 106734327 A CN106734327 A CN 106734327A CN 201611042735 A CN201611042735 A CN 201611042735A CN 106734327 A CN106734327 A CN 106734327A
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- CN
- China
- Prior art keywords
- brass
- seamless pipe
- cold
- moulding process
- admirality
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Extraction Processes (AREA)
Abstract
The present invention relates to a kind of moulding process of admirality brass seamless pipe, which solve existing brass tube lower hardness, the technical problem that tensile strength is low, elongation percentage is low produced by cold machining process, it carries out once cold rolling first, and next is heat-treated, and then carries out secondary cold-rolling；Its production that can be widely applied to admirality brass seamless pipe.
Description
Technical field
The present invention relates to a kind of production method of seamless pipe, specifically a kind of moulding process of admirality brass seamless pipe.
Background technology
Admirality brass is the conventional a kind of material of pump barrel in the petroleum equipment of oil field, and it has excellent corrosion resistance.Mesh
Before, the production of admirality brass based on cold-drawing molding process, but because pump barrel is high to material precision requirement, and cold-drawn passage
Many, the product percent of pass produced is very low.
How to improve qualification rate is those skilled in the art's technical problem urgently to be resolved hurrily, and cold rolling shaping can be solved preferably
Certainly material precision problem, but it is low to there is material hardness relatively low (HRB70-85), tensile strength low (430-560MPa), elongation percentage
The shortcomings of (7%-11%).
The content of the invention
The present invention be exactly in order to solve it is existing by cold machining process produce brass tube lower hardness, tensile strength it is low,
A kind of low technical problem of elongation percentage, there is provided the shaping work of the admirality brass seamless pipe that hardness is high, tensile strength is high, elongation percentage is high
Skill.
The present invention is by traditional cold-rolling method digitization, and the method for introducing tissue thermal change and flow harden,
The method that the process of tube forming is changed with microstructure is summarized and counter is pushed into macroscopical production process.Can be with complete using the method
The model difference between finished product and raw material is matched kindly while can solve the problem that the performance deficiency problem that material is present.
The technical scheme is that, comprise the following steps：
(1) Foundry Production brass base pipe；
(2) the surface shrinkage line of casting process generation is removed by way of the reconditioning of outer surface；
(3) once cold rolling is carried out；
(4) will be heat-treated by the materials in the tube after once cold rolling；
(5) secondary cold-rolling is carried out.
Preferably, in step (4), the heating-up time is 2 hours, and holding temperature is 550 DEG C~650 DEG C, and soaking time does not surpass
3 hours are spent, fire door is directly opened during cooling.
Preferably, in step (3), cold deformation decrement is 48.8%.
The beneficial effects of the invention are as follows：
(1) slab selection casts the brass tube that is pulled, and shaping is simple, low cost.
(2) only need once to be heat-treated during formed product, organize tendency of growing up small, and effectively increase material shaping effect
Rate, reduces processing cost.
(3) tensile strength of basis brass cold rolled tube is brought up into 540-650MPa, while material percentage elongation is 16-
34%, yield strength is 420-510MPa, and hardness is HRB90-100.Material is molded qualification rate more than 95%, and product linearity is excellent
Good, wall thickness deviation is less than 5%.
(4) final material can meet existing product standard requirement without stress relief annealing, be extremely suitable for existing
Pump barrel production technology.
Further aspect of the present invention and aspect, by below with reference to the description of the specific embodiment of accompanying drawing, are able to
It is clearly stated that.
Brief description of the drawings
Fig. 1 is the metallurgical structure figure for removing the brass base pipe after surface shrinkage line；
Fig. 2 is the sectional view of brass base pipe；
Fig. 3 is the schematic diagram of heat treatment；
The metallurgical structure figure of materials in the tube after Fig. 4 heat treatments.
Specific embodiment
It is below the brass finished product of φ 50.8X φ 44.45 (as 50.8mm, internal diameter is 44.45mm to external diameter) with product specification
The specific steps of the technique are illustrated as a example by pipe：
Step one, Foundry Production meets the brass base pipe of required chemical composition, and base pipe specification is that (external diameter is φ 80X8
80mm, wall thickness is 8mm).
Step 2, removes the surface shrinkage line of casting process generation by way of the reconditioning of outer surface.In blank now
Portion is organized as thick column crystal crystal grain (as shown in Figure 1), and core hardness is HRB60-70, according to ASTM A370 normative documents
The standard of middle tube wall sampling, the tensile strength of material is no more than 200MPa, and elongation is not less than 70%.
Step 3, carries out once cold rolling, and brass base pipe size is rolled into φ 64X5 by cold-rolling method, and (external diameter is
64mm, wall thickness is 5mm), cold deformation decrement is 48.8%.
With reference to Fig. 2, the calculation of cold deformation decrement is as follows：
Computing formula S=π * (D/2) according to cross-sectional area2-π*(d/2)2To be calculated.
Specification is that the cross-sectional area of the brass base pipe of φ 80X8 is：
S1=3.14159* (80/2)2-3.14159*(64/2)2=1809.5
Specification is that the cross-sectional area of the brass base pipe of φ 64X5 is：
S2=3.14159* (64/2)2-3.14159*(54/2)2=927
Cold deformation decrement △ S=(1809.5-927)/1809.5*100%=48.8%
Step 4, as shown in figure 3, the materials in the tube after once cold rolling are heat-treated in high accuracy pot arch, to promote brass
Core tissue is from as cast condition column crystal orientation α structural transformations.
Programming rate is controlled according to batch, by taking closed box type stove as an example, 2 tons of batch, the heating-up time is 2 hours, often
Increase by one ton of batch, it is necessary to increase the heating-up time 0.5 hour.
Holding temperature is 550 DEG C~650 DEG C, preferably 600 DEG C.Soaking time is no more than 3 hours, but in insulating product temperature
On the premise of reaching requirement, soaking time was preferred less than 1 hour.
Fire door is directly opened during cooling, can so accelerate cooling velocity, it is ensured that material structure crystal grain will not grow up
Influence material plasticity and toughness.
The metallographic structure of materials in the tube facilitates the cold rolling of next step as shown in figure 4, the tissue possesses preferable plasticity and toughness after transformation
Processing.
Step 5, carries out secondary cold-rolling, and the rule of φ 50.8X φ 44.5 are rolled to by the cold rolling brass base pipe by after heat treatment
Lattice, control the secondary decrement of materials in the tube so as to control the tensile strength TS of final products, yield strength YS, elongation and hard
Degree.Secondary cold-rolling decrement is 49.1%, and product tensile strength is 540-650MPa, and yield strength is 420-510MPa, elongation
Rate is 16-34%, and hardness is HRB90-100, meets requirement of the current main-stream oil gas field brass housing to the material.
The above is not intended to limit the invention only to the preferred embodiments of the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.
Claims (3)
1. a kind of moulding process of admirality brass seamless pipe, it is characterized in that, comprise the following steps：
(1) Foundry Production brass base pipe；
(2) the surface shrinkage line of casting process generation is removed by way of the reconditioning of outer surface；
(3) once cold rolling is carried out；
(4) will be heat-treated by the materials in the tube after once cold rolling；
(5) secondary cold-rolling is carried out.
2. the moulding process of admirality brass seamless pipe according to claim 1, it is characterised in that：
In the step (4), the heating-up time is 2 hours, and holding temperature is 550 DEG C~650 DEG C, and soaking time is no more than 3 hours,
Fire door is directly opened during cooling.
3. the moulding process of admirality brass seamless pipe according to claim 2, it is characterised in that：
In the step (3), cold deformation decrement is 48.8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611042735.6A CN106734327A (en) | 2016-11-11 | 2016-11-11 | A kind of moulding process of admirality brass seamless pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611042735.6A CN106734327A (en) | 2016-11-11 | 2016-11-11 | A kind of moulding process of admirality brass seamless pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106734327A true CN106734327A (en) | 2017-05-31 |
Family
ID=58974836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611042735.6A Pending CN106734327A (en) | 2016-11-11 | 2016-11-11 | A kind of moulding process of admirality brass seamless pipe |
Country Status (1)
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| CN (1) | CN106734327A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998018974A1 (en) * | 1996-10-29 | 1998-05-07 | Tubacex, S.A. | Austenitic-ferritic steel of the superduplex type applicable to the fabrication of seamless tubes |
| CN1214976A (en) * | 1997-10-22 | 1999-04-28 | 中国科学院金属研究所 | High-alloy seamless deformed pipe material processing technology |
| CN1532007A (en) * | 2003-03-19 | 2004-09-29 | 中国科学院金属研究所 | New process for producing high alloy deformed seamless pipe |
| CN103981421A (en) * | 2014-05-13 | 2014-08-13 | 南安市国高建材科技有限公司 | Wear-resistant, heatproof, and anticorrosive pipe |
| CN105499920A (en) * | 2015-12-08 | 2016-04-20 | 安徽宝泰特种材料有限公司 | Manufacturing method for large-caliber and thick-wall seamless niobium pipes |
-
2016
- 2016-11-11 CN CN201611042735.6A patent/CN106734327A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998018974A1 (en) * | 1996-10-29 | 1998-05-07 | Tubacex, S.A. | Austenitic-ferritic steel of the superduplex type applicable to the fabrication of seamless tubes |
| CN1214976A (en) * | 1997-10-22 | 1999-04-28 | 中国科学院金属研究所 | High-alloy seamless deformed pipe material processing technology |
| CN1532007A (en) * | 2003-03-19 | 2004-09-29 | 中国科学院金属研究所 | New process for producing high alloy deformed seamless pipe |
| CN103981421A (en) * | 2014-05-13 | 2014-08-13 | 南安市国高建材科技有限公司 | Wear-resistant, heatproof, and anticorrosive pipe |
| CN105499920A (en) * | 2015-12-08 | 2016-04-20 | 安徽宝泰特种材料有限公司 | Manufacturing method for large-caliber and thick-wall seamless niobium pipes |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20170531 |