CN213495705U

CN213495705U - Production system of 110-grade super dual-phase steel seamless steel pipe

Info

Publication number: CN213495705U
Application number: CN202022028602.1U
Authority: CN
Inventors: 郭玲; 刘富强; 王连华
Original assignee: Handan Xinxing Special Pipe Co ltd
Current assignee: Handan Xinxing Special Pipe Co ltd
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-06-22
Anticipated expiration: 2030-09-16

Abstract

The utility model relates to a 110 super duplex steel seamless steel pipe's of steel level production system, the system includes blank processing equipment, heating furnace, lubricating arrangement, horizontal extruder, heat treatment furnace, burnishing machine, surface inspection equipment, cold rolling mill, a cleaning machine, straightening machine, secondary cleaning machine, ultrasonic flaw detector, quality and performance inspection equipment and equipment for packing. The devices are arranged in sequence, the blank processing device is communicated with the blank warehouse, and the packaging device is communicated with the finished product warehouse. The blank processing equipment comprises a lathe and a deep hole drilling machine, and the heating furnace is an annular furnace or a box-type electric furnace. The utility model discloses optimize seamless steel tubular product production facility and process, realized the production of 110 steel level super diphase steel tubular product, the tubular product stable performance of producing, interior external surface are good.

Description

Production system of 110-grade super dual-phase steel seamless steel pipe

Technical Field

The utility model belongs to the technical field of industry steel hot extrusion moulding and cold rolling manufacturing, a 110 super diphase steel seamless steel tubular product's of steel level production system is related to.

Background

The duplex stainless steel has strong strength and corrosion resistance, and is mainly used for chemical processing, petrochemical industry and seabed equipment. It has strong chloride corrosion resistance, high heat conductivity and low thermal expansion coefficient. The high chromium, molybdenum and nitrogen contents have high capability of resisting pitting corrosion, crevice corrosion and general corrosion. Seamless steel pipes represented by 25 Cr-7 Ni-4 Mo-110 KSI are the most economical sulfide corrosion resistant alloys in the market at present, and steel advanced major countries such as America, Japan and the like begin to develop beltline grade dual-phase steel products. However, the performance stability, the forming process and other aspects of the steel strip have problems, the development of the domestic dual-phase steel strip class products is in a blank state at present, and no successful manufacturers are developed at home.

Compared with the traditional delivery in a heat treatment state, the super dual-phase steel pipe has the defects of uneven performance of different sections, narrow adjustable range of deformation and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a 110 super duplex steel seamless steel tubular product's of steel level production system produces the stable performance, the good 110 super duplex steel 25Cr of steel level ~ 7Ni ~ 4Mo ~ 110ksi tubular product of inside and outside surface, optimizes product quality, improves production efficiency.

The technical scheme of the utility model: the production system of the 10-steel-grade super dual-phase steel seamless steel pipe comprises a blank processing device, a heating furnace, a lubricating device, a horizontal extruder, a heat treatment furnace, a polishing machine, a surface inspection device, a cold rolling mill, a primary cleaning machine, a straightening machine, a secondary cleaning machine, an ultrasonic flaw detector, a quality and performance inspection device and a packaging device. The device comprises a blank processing device, a heating furnace, a lubricating device, a horizontal extruder, a heat treatment furnace, a polishing machine, a surface inspection device, a cold rolling mill, a primary cleaning machine, a straightening machine, a secondary cleaning machine, an ultrasonic flaw detector, a quality and performance inspection device and a packaging device which are sequentially arranged. The blank processing equipment is communicated with the blank warehouse, and the packaging equipment is communicated with the finished product warehouse.

The blank processing equipment comprises a lathe and a deep hole drilling machine, and the heating furnace is an annular furnace or a box-type electric furnace. The box-type electric furnace consists of a furnace base, an observation hole, a furnace door, a thermocouple, a furnace shell, an electric furnace wire, a refractory material, an insulating layer and a furnace frame. The horizontal extruder consists of a base, a mold-mold pad-mold base assembly, an extrusion container jacket, an extrusion container liner, an extrusion pad, a core rod, a needle support and an extrusion rod. The heat treatment furnace consists of a heating section, a cooling section, a water inlet/return pipeline, a heat exchanger, a gas conveyer, a gas circulator, a feeding section, a heat exchange platform and a discharging section.

The utility model discloses 110 super duplex steel seamless steel pipe's of steel level production system, through the reasonable combination with the processing equipment, the process of production has been optimized, the Ni base alloy product of high added value is replaced to the high performance product that will be cheaper, 110 super duplex steel 25Cr ~ 7Ni ~ 4Mo ~ 110ksi tubular product's of steel level production has been realized, the lead running status in high-end application market such as anticorrosive has been improved, 110 super duplex steel 25Cr ~ 7Ni ~ 4Mo ~ 110ksi tubular product stable performance of steel level produced, the internal and external surface is good, investment and manufacturing cost are reduced, be favorable to increasing enterprise economic benefits.

Drawings

FIG. 1 is a schematic diagram of a 110-grade super dual-phase steel seamless steel pipe production system;

FIG. 2 is a schematic view of the structure of a heating furnace;

FIG. 3 is a schematic view of the structure of a horizontal extruder;

FIG. 4 is a schematic view of the structure of the thermal processor;

FIG. 5 is a schematic view showing the structure of a leveler;

wherein: 1-blank processing equipment, 2-heating furnace, 21-furnace base, 22-observation hole, 23-furnace door, 24-thermocouple, 25-furnace shell, 26-electric furnace wire, 27-refractory material, 28-heat-insulating layer, 29-furnace frame, 3-lubricating equipment, 4-horizontal extruder, 41-base, 42-mould pad-mould seat component, 43-extruding cylinder jacket, 44-extruding cylinder, 45-extruding cylinder liner, 46-extruding pad, 47-core rod, 48-needle support, 49-extruding rod, 5-heat treatment furnace, 51-heating section, 52-cooling section, 53-water inlet/return pipeline, 54-heat exchanger, 55-gas conveyer, 56-gas circulator, 57-feeding section, 58-heat exchange platform, 59-discharging section, 6-polishing machine, 7-surface inspection equipment, 8-cold rolling machine, 9-primary cleaning machine, 10-straightening machine, 11-secondary cleaning machine, 12-ultrasonic flaw detector, 13-quality and performance inspection equipment and 14-packaging equipment.

Detailed Description

The present invention will be described in detail with reference to the following examples and drawings. The protection scope of the present invention is not limited to the embodiments, and those skilled in the art can make any changes within the scope defined by the claims.

The utility model discloses 110 super duplex steel seamless steel pipe's of steel grade production system, as shown in figure 1, including blank processing equipment 1, heating furnace 2, lubricating apparatus 3, horizontal extruder 4, heat treatment furnace 5, burnishing machine 6, surface inspection equipment 7, cold rolling mill 8, a cleaning machine 9, straightening machine 10, secondary cleaning machine 11, ultrasonic flaw detector 12, quality and performance inspection equipment 13 and equipment for packing 14. The device comprises a blank processing device, a heating furnace, a lubricating device, a horizontal extruder, a heat treatment furnace, a polishing machine, a surface inspection device, a cold rolling mill, a primary cleaning machine, a straightening machine, a secondary cleaning machine, an ultrasonic flaw detector, a quality and performance inspection device and a packaging device which are sequentially arranged. The blank processing equipment is communicated with the blank warehouse, and the packaging equipment is communicated with the finished product warehouse. The blank processing apparatus 1 includes a lathe and a deep hole drilling machine.

The heating furnace is a box-type electric furnace, and as shown in fig. 2, the box-type electric furnace is composed of a furnace base 21, an observation hole 22, a furnace door 23, a thermocouple 24, a furnace shell 25, an electric furnace wire 26, a refractory material 27, an insulating layer 28 and a furnace frame 29. As shown in fig. 3, the horizontal extruder 4 is comprised of a base 41, a die-pad-die holder assembly 42, a container jacket 43, a container 44, a container liner 45, a squeeze pad 46, a mandrel 47, a needle support 48, and a squeeze rod 49. The heat treatment furnace 5 consists of a heating section 51, a cooling section 52, a water inlet/return pipeline 53, a heat exchanger 54, a gas conveyer 55, a gas circulator 56, a feeding section 57, a heat exchange platform 58 and a discharging section 59. FIG. 5 shows the leveler as described above. The other equipment is conventional processing equipment.

The utility model discloses 110 steel level super duplex steel seamless steel pipe production method to production 25Cr ~ 7Ni ~ 4Mo ~ 110ksi oil sleeve pipe is taken as an example, and the specification is phi 168.28mm 10.59mm, and the production technology route is: the process route is as follows: blank processing → blank heating → lubrication → hot extrusion → heat treatment → surface treatment → inspection → cold rolling → deoiling → straightening → deoiling → flaw detection → inspection → packaging and warehousing. The specific process flow chart is shown in an accessory 2, the specific equipment structure chart is shown in a table 3, and the specific production steps are as follows:

firstly, blank processing: for round steel with the steel number of 25 Cr-7 Ni-4 Mo-110 ksi, sawing, machining the outer surface by a lathe and machining an inner hole by a deep hole drilling machine according to the process requirements; length 865mm, outer diameter phi 357mm, inner hole diameter 80mm, outer surface roughness less than or equal to 2.5 μm, and head outer edge chamfer R20; the chemical composition of the billet is shown in table 1, and the contents of inclusions, hardness and ferrite in the billet are shown in table 2:

TABLE 1 chemical composition of the blank

TABLE 2 inclusions, hardness, ferrite content of the blanks

Secondly, heating the blank: preheating the blank in an annular furnace to 950-1000 ℃, preserving heat for 2 hours, then heating to 1120-1160 ℃ by using medium-frequency induction heating equipment, preserving heat for 2-3 minutes, and discharging.

Lubricating: the outer surface of the blank is lubricated in an automatic rolling coating mode, and 6807 glass powder is used for internal lubrication; 844-7 glass powder is used for external lubrication, the glass powder is uniformly scattered into an inner hole of a blank, a glass pad is used for lubrication between a hole pattern of the die and a workpiece, and 6807 glass powder is used for the glass pad.

Fourthly, hot extrusion: hot-extruding the blank by using a 63MN horizontal extruder of Italian Daneli company to form a pierced billet, wherein 357 series extrusion cylinders are selected as the extrusion cylinders; the extrusion parameters were: the extrusion speed is 240-350 mm/s, the extrusion ratio is 7.48, and the theoretical calculation extrusion force is 40-55 MN.

Fifthly, heat treatment: carrying out heat treatment on the pierced billet by using a roller-hearth type atmosphere protection continuous heat treatment furnace to eliminate precipitated phases; the heat treatment process parameters are shown in table 3:

TABLE 3 Heat treatment parameters

Sixthly, surface processing: and removing the oxide skin, cracks and other defects on the inner surface and the outer surface of the pierced billet by using a polishing machine.

The training is as follows: firstly, checking whether the size of the pierced billet meets the requirement of the technical specification, checking whether the inner surface of the pierced billet has defects such as cracks by using an endoscope, and detecting whether capillary cracks exist on the outer surface by coloring; and after the inner surface and the outer surface are inspected to have no defects, the cold rolling process is transferred to a cold rolling process to prepare for cold rolling.

Cold rolling: different reducing amounts and wall reducing amounts are designed according to the wall thickness of a finished pipe, the specification of a cold-rolled pierced billet is phi 177.8 multiplied by 11.5mm, the size of a rolled finished product is phi 168.28 multiplied by 10.59mm, the outer diameter tolerance D is between 0.79mm and 1.68mm, the wall thickness tolerance S is between 1.059mm and 1.059mm, and the total deformation amount is controlled to be 5 to 13 percent; the cold rolling data are shown in Table 4, and the performance data after cold rolling are shown in Table 5.

TABLE 4 Cold Rolling data

TABLE 5 relationship between Cold Rolling Properties and deformation

Self-skin deoiling: because the cold rolling is lubricated by rolling oil, the oil is removed after the first rolling, the lubricating oil on the surface of the pipe is removed completely to facilitate the next straightening, and the oil removing process uses HF + HNO3 mixed acid for acid cleaning and oil removing, wherein the concentration of HF is 2 percent, and HNO is used for removing oil₃The concentration is 12%, and the deoiling temperature is 30-40 ℃.

The method has the advantages of straightening: and (4) performing point straightening on a press machine, and straightening the bent part of the pipe by utilizing a lever principle.

Taking secondary deoiling: after straightening, the oil is removed again, and the oil removing method is the same as the self-hairing method.

Performing water-logging flaw detection: carrying out online flaw detection on the finished product pipe by using an ultrasonic KK flaw detector, wherein the flaw detection grade is carried out according to the technical standard requirement; specifically, the ultrasonic detection is carried out one by one according to the ASTM E213 standard, the inner and outer horizontal and longitudinal directions, the grade L2 and the blind zone hand detection. And detecting that the delamination defect area is not more than 260mm2 delamination damage, and the flat-bottom hole size is phi 6x2.64mm, and is in accordance with the standard ISO 10124. And requires on-line measurement of wall thickness with 100% wall thickness coverage. .

And (5) performing selection examination: the finished products were subjected to dimensional (specification) inspection one by one using an outside diameter and wall thickness micrometer, and then performance inspection was performed in a physicochemical laboratory, and the specifications of the finished products and the performance inspection results are shown in table 6.

And (5) packaging and warehousing: tests show that the super dual-phase steel 25 Cr-7 Ni-4 Mo 110 produced by the method has steel grade, dimensional precision, physical and chemical properties and mechanical properties meeting the requirements of technical specifications, and is subjected to proper protective packaging according to transportation requirements.

TABLE 6 specification and Performance test results of 110 grade super dual phase seamless steel pipes

Claims

1. A production system of 110-grade super dual-phase steel seamless steel pipes is characterized in that: the production system comprises a blank processing device (1), a heating furnace (2), a lubricating device (3), a horizontal extruder (4), a heat treatment furnace (5), a polishing machine (6), a surface inspection device (7), a cold rolling machine (8), a primary cleaning machine (9), a straightening machine (10), a secondary cleaning machine (11), an ultrasonic flaw detector (12), a quality and performance inspection device (13) and a packaging device (14), wherein the blank processing device, the heating furnace, the lubricating device, the horizontal extruder, the heat treatment furnace, the polishing machine, the surface inspection device, the cold rolling machine, the primary cleaning machine, the straightening machine, the secondary cleaning machine, the ultrasonic flaw detector, the quality and performance inspection device and the packaging device are sequentially arranged; the blank processing equipment is communicated with a blank warehouse, and the packaging equipment is communicated with a finished product warehouse.

2. The system for producing a 110-grade super dual-phase steel seamless steel pipe according to claim 1, wherein: the blank processing equipment (1) comprises a lathe and a deep hole drilling machine, and the heating furnace is an annular furnace or a box-type electric furnace; the box-type electric furnace consists of a furnace base (21), an observation hole (22), a furnace door (23), a thermocouple (24), a furnace shell (25), an electric furnace wire (26), a refractory material (27), an insulating layer (28) and a furnace frame (29).

3. The system for producing a 110-grade super dual-phase steel seamless steel pipe according to claim 1, wherein: the horizontal extruder (4) is composed of a base (41), a mold-die pad-die holder assembly (42), an extrusion container jacket (43), an extrusion container (44), an extrusion container liner (45), an extrusion pad (46), a core rod (47), a needle support (48) and an extrusion rod (49).

4. The system for producing a 110-grade super dual-phase steel seamless steel pipe according to claim 1, wherein: the heat treatment furnace (5) is composed of a heating section (51), a cooling section (52), a water inlet/return pipeline (53), a heat exchanger (54), a gas conveyer (55), a gas circulator (56), a feeding section (57), a heat exchange platform (58) and a discharging section (59).