CN111215474A - Manufacturing method of martensite stainless steel continuous casting billet extrusion seamless tube - Google Patents
Manufacturing method of martensite stainless steel continuous casting billet extrusion seamless tube Download PDFInfo
- Publication number
- CN111215474A CN111215474A CN201911202720.5A CN201911202720A CN111215474A CN 111215474 A CN111215474 A CN 111215474A CN 201911202720 A CN201911202720 A CN 201911202720A CN 111215474 A CN111215474 A CN 111215474A
- Authority
- CN
- China
- Prior art keywords
- continuous casting
- casting billet
- extrusion
- stainless steel
- lubricant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
-
- 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
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
-
- 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
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/085—Making tubes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention discloses a manufacturing method of a martensitic stainless steel continuous casting billet extrusion seamless pipe. The method comprises the following steps: firstly, preparing a martensitic stainless steel continuous casting billet; secondly, peeling and segmenting the surface of the continuous casting billet; thirdly, drilling a continuous casting billet and machining a horn mouth on the end face; fourthly, cleaning and preheating the continuous casting billet; fifthly, carrying out induction heating on the continuous casting blank and rolling a lubricant; sixthly, adding a lubricant into the bell mouth and expanding the bell mouth; seventhly, induction heating is performed again, and an external rolling lubricant is added internally; and eighth step, preparing a tool and a die and performing extrusion forming. The invention provides an extrusion method of a martensitic stainless steel continuous casting billet, which takes a continuous casting round billet as a raw material, removes the defects of loose center, shrinkage cavity and the like of the continuous casting billet through external peeling and internal drilling, improves the center quality of the continuous casting billet through hole expansion, and finishes the production of a martensitic stainless steel seamless pipe through an extrusion process.
Description
Technical Field
The invention relates to the field of steel manufacturing, in particular to a process method for directly extruding martensitic stainless steel into a seamless pipe by adopting a continuous casting billet.
Background
The martensitic stainless steel seamless pipe is mainly applied to the oil-gas well industry, and at present, oil well pipes are mainly divided into two categories, namely the oil well pipe produced according to the API standard and the oil well pipe produced according to the non-API standard. Although L80-13Cr is a steel grade in API standard, most steel pipe manufacturers in China do not have steelmaking advantages for the production of high alloy steel pipes, and screw threads of most manufacturers are processed into API standard screw threads, so that the L80-13Cr oil well pipe part which is used for corrosion-resistant ultra-deep wells at present is imported, and L80-13Cr produced by various steel factories in China is not enough in technical capability, so that the quality of products in the market is uneven, and the manufacturing cost is relatively high. As the demand of high alloy steel oil well pipes such as L80-13Cr is necessarily increased due to the increase of offshore oil and gas wells and ultra-deep wells, the development of L80-13Cr oil well pipes is a good direction.
Disclosure of Invention
The invention aims to provide a manufacturing method of a martensitic stainless steel continuous casting billet extrusion seamless pipe, which solves the problems in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
a manufacturing method of a martensitic stainless steel continuous casting billet extrusion seamless tube comprises the following steps:
the first step is blank preparation, wherein the continuous casting blank comprises L80-13Cr, L80-9Cr, modified 13Cr added with Mo and Ni alloy, and the like.
And secondly, peeling and segmenting, wherein peeling processing is required due to the fact that the surface of the continuous casting billet is rough, and then segmenting is performed according to the length design of the finished product pipe.
Thirdly, drilling and machining a bell mouth, drilling a hole in the center of the continuous casting billet by 30-80 mm, and chamfering the bell mouth by 35-45 degrees according to the diameter of the drilled hole; the continuous casting blank has the characteristics that the core has the defects of looseness, shrinkage cavity and the like which are not beneficial to extrusion, but the extrusion process has the characteristics that the center of the blank needs to be drilled, and the end part needs to be processed with a bell mouth, so that the lubricating agent can be added and the hole can be expanded.
And fourthly, cleaning and preheating, wherein oil stains exist on the surface of the processed continuous casting billet, so that the continuous casting billet needs to be cleaned, and the surface carburization phenomenon is avoided during heating. Low temperature preheating is required due to the relatively poor thermal conductivity of stainless steel.
And fifthly, heating and coating the lubricant, wherein the continuous casting billet needs to be rapidly heated by an induction furnace, so that the high-temperature plastic deformation of the stainless steel is facilitated. During reaming, the reaming barrel and the continuous casting billet belong to intermetallic surface friction, and the friction force is large, so that a lubricant needs to be rolled on the surface of the continuous casting billet.
Sixthly, lubricating the core and reaming, and placing the lubricant at the position of the bell mouth to fill. The reaming head is aligned to the center, and reaming is finished under the action of the reaming rod, and the reaming process is small in deformation amount, so that the quality of the core of the continuous casting billet is improved.
And seventhly, reheating and lubricating, wherein the continuous casting blank after hole expansion is cooled, so that the continuous casting blank is quickly heated by the induction furnace again. In order to reduce the friction between the continuous casting slab and the extrusion container and the core rod, it is necessary to add a lubricant to the inner bore and roll the lubricant on the outer surface.
And eighthly, preparing a tool and a die and extruding, wherein preheating preparation needs to be carried out on the extrusion container and the core rod in order to reduce the cooling of the continuous casting blank after the continuous casting blank contacts the tool and the die. After the continuous casting billet enters the extrusion container, the core rod rapidly extends into the inner hole, and extrusion is completed under the thrust of the extrusion rod.
As a further scheme of the invention: in the first step, the continuous casting blank is produced by adopting the process of electric furnace + LF + VD + CCM, and the outer diameter of the continuous casting blank is as follows: phi 180-500 mm, continuous casting billet length: 1500-7000 mm. Compared with austenitic stainless steel, the martensitic stainless steel continuous casting billet adopted by the invention has the technology of continuous casting of large round billets, is easier to form and has better low-power quality. Compared with the traditional ingot casting and forging technology, the continuous casting has the advantages of high production efficiency, high yield and low cost. And the method is matched with an extrusion process to make up for the adverse factors of continuous casting, so that the method can extrude a high-quality seamless pipe by adopting the low-cost continuous casting billet.
As a still further scheme of the invention: in the first step, the modified 13Cr is obtained by adding 0.5 to 3.0 wt% of Mo alloy and 1.0 to 6.0 wt% of Ni alloy to L80-13 Cr.
As a still further scheme of the invention: in the second step, the peeling depth is 3-8 mm, and the surface roughness after peeling is Ra6.3. The segment length of the continuous casting billet is 450-1200 mm.
As a still further scheme of the invention: and in the fourth step, cleaning the machined continuous casting blank by using alkali liquor to remove oil stains, wherein the preheating temperature is 750-850 ℃.
As a still further scheme of the invention: and in the fifth step, heating the continuous casting billet by using an induction furnace at the heating temperature of 1100-1180 ℃. And rolling a lubricant for the heated continuous casting billet, wherein the lubricant is glass powder, and the type of the glass powder is 844-7.
As a still further scheme of the invention: and in the sixth step, the bell mouth of the continuous casting billet is firstly plugged with glass wool to block the inner hole, and a lubricating agent is added into the bell mouth and is medium-alkali powder. And (3) placing a reaming head on the lubricating agent of the bell mouth, wherein the reaming head is made of H13 die steel.
As a still further scheme of the invention: and in the seventh step, the continuous casting slab is heated by the induction furnace again, and the heating temperature is 1150-1220 ℃. The continuous casting blank needs to be internally and externally spread with a pressure lubricant, wherein the internal lubricant is medium-alkali powder, and the external lubricant is 844-7 glass powder. When lubricant is scattered on the inner surface, the continuous casting billet rotates on the tugboat.
As a still further scheme of the invention: and in the eighth step, the tools and the dies are an extrusion cylinder, a core rod and an extrusion die, wherein the extrusion cylinder needs to be preheated to 200-350 ℃, and the core rod needs to be preheated to 300-450 ℃. The extrusion speed is 150-300 mm/s, and the extrusion force is 20-63 MN.
Compared with the prior art, the invention has the beneficial effects that: compared with the traditional ingot casting and forging blank making process, the method for extruding the seamless tube by the martensitic stainless steel continuous casting blank has the advantages that the production efficiency of the continuous casting blank is high, the yield is high, the forging process is omitted, and the continuous casting blank is directly used for extrusion, so the cost is reduced by more than 20%. Because the method adopts the extrusion deformation technology with three-dimensional compressive stress, the surface of the continuous casting billet is almost completely limited by a tool during extrusion and is formed under the action of the three-dimensional compressive stress, namely, the hydrostatic pressure component of the internal stress of the continuous casting billet is greatly influenced, so that the metal material can be greatly deformed, and the maximum plasticity of the metal can be fully exerted. Therefore, the produced product has good quality of the inner and outer surfaces, stable quality, higher competitiveness and prominent process advantages.
Drawings
FIG. 1 shows the whole process of the manufacturing method of the martensitic stainless steel continuous casting billet extrusion seamless pipe.
FIG. 2 is a drawing of the extrusion process of the martensitic stainless steel continuous casting billet to extrude the seamless tube.
FIG. 3 is a schematic drawing showing the extrusion stress of the martensitic stainless steel continuous casting billet extruded seamless pipe of the present invention.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following embodiments.
The whole process of the manufacturing method of the martensitic stainless steel continuous casting billet extrusion seamless tube is shown in figure 1. Wherein the action of continuous casting billet in the recipient is seen in figure 2, puts into recipient 4 earlier continuous casting billet 1, and plug 3 stretches into the centre bore of continuous casting billet 1 in advance, and extrusion pad 5 extrudes the continuous casting billet from extrusion die 2 under the promotion of stripper bar 6, and the mould supports 7 and withstands extrusion die 2 and makes it fixed unchangeable. Referring to fig. 3, the continuous casting billet is subjected to extrusion forces in three directions, namely positive pressure P, circumferential pressure N and counter pressure T during extrusion. Due to the characteristic of the three-way compressive stress, the metal material can only flow along the direction of the extrusion opening in a closed space, so the optimal plastic deformation of the material can be fully exerted in the deformation process, and particularly for cast structure metals such as continuous casting billets and cast ingots with poor plasticity and difficult-deformation alloys with large high-temperature deformation resistance, narrow deformation temperature range and the like.
Example 1
A manufacturing method of a martensitic stainless steel continuous casting billet extrusion seamless tube comprises the following steps:
firstly, preparing a blank, wherein the material of the continuous casting billet is L80-13Cr, and the specification of the continuous casting billet is phi 430 mm.
And step two, peeling and segmenting, wherein peeling processing is required due to the fact that the surface of the continuous casting billet is rough, the processing specification is phi 415mm, and the segment length is 820 mm.
And thirdly, drilling and machining the bell mouth, wherein the continuous casting blank has the defects of looseness, shrinkage and the like at the core part which are not beneficial to extrusion, but the extrusion process has the characteristics that the blank needs to be drilled at the center, the diameter of the drilled hole is 80mm, the bell mouth is machined at the end part, and the taper of the bell mouth is 42 degrees.
And fourthly, cleaning and preheating, wherein oil stains exist on the surface of the processed continuous casting billet, so that the continuous casting billet needs to be cleaned by adopting alkali liquor. Since stainless steel has relatively poor thermal conductivity, low temperature preheating is required, which is 800 ℃.
And fifthly, heating and coating a lubricant, wherein the continuous casting slab needs to be rapidly heated by an induction furnace, and the heating temperature is 1150 ℃. The reaming barrel and the continuous casting slab have intermetallic surface friction and large friction force during reaming, so that a lubricant is required to be rolled on the surface of the continuous casting slab, and the lubricant is 844-7 glass powder.
Sixthly, core lubrication and hole expansion are carried out, a lubricant is placed at the position of the bell mouth, and the lubricant is medium alkali powder and is filled. Adopt phi 169mm reaming head to aim at the center, accomplish the reaming under the effect of reaming pole, because the reaming process is little deflection, just play the improvement effect to the core quality of continuous casting billet.
And seventhly, reheating and lubricating, wherein the temperature of the continuous casting blank after hole expanding is already reduced, so that the continuous casting blank is quickly heated by an induction furnace again, and the heating temperature is 1210 ℃. In order to reduce the friction between the continuous casting billet and the extrusion cylinder and the core rod, an alkali powder lubricant is added into the inner hole, and a glass powder lubricant is rolled 844-7 on the outer surface.
And eighthly, preparing and extruding a tool and a die, wherein in order to reduce the cooling of the continuous casting blank after contacting the tool and the die, the extrusion cylinder needs to be preheated by 250 ℃ and the core rod needs to be preheated by 300 ℃. After the continuous casting billet enters the extrusion container, the core rod rapidly extends into the inner hole, the extrusion speed is 250mm/s, the extrusion force is 54MN, the outer diameter of the extruded finished pipe is 219mm, the wall thickness is 30mm, and the length is 5600 mm.
Example 2
A manufacturing method of a martensitic stainless steel continuous casting billet extrusion seamless tube comprises the following steps:
firstly, preparing a blank, wherein the material of the continuous casting billet is L80-13Cr, and the specification of the continuous casting billet is phi 220 mm.
And step two, peeling and segmenting, wherein peeling processing is required due to the rough surface of the continuous casting billet, the processing specification is phi 213mm, and the segment length is 541 mm.
And thirdly, drilling and machining the bell mouth, wherein the continuous casting blank has the defects of looseness, shrinkage and the like at the core part which are not beneficial to extrusion, but the extrusion process has the characteristics that the blank needs to be drilled at the center, the diameter of the drilled hole is 30mm, the bell mouth is machined at the end part, and the taper of the bell mouth is 38 degrees.
And fourthly, cleaning and preheating, wherein oil stains exist on the surface of the processed continuous casting billet, so that the continuous casting billet needs to be cleaned by adopting alkali liquor. Since stainless steel has relatively poor thermal conductivity, low temperature preheating is required, which is 780 ℃.
And fifthly, heating and coating a lubricant, wherein the continuous casting slab needs to be rapidly heated by an induction furnace, and the heating temperature is 1120 ℃. The reaming barrel and the continuous casting slab have intermetallic surface friction and large friction force during reaming, so that a lubricant is required to be rolled on the surface of the continuous casting slab, and the lubricant is 844-7 glass powder.
Sixthly, core lubrication and hole expansion are carried out, a lubricant is placed at the position of the bell mouth, and the lubricant is medium alkali powder and is filled. Adopt phi 84mm reaming head to aim at the center, accomplish the reaming under the effect of reaming pole, because the reaming process is little deflection, just play the improvement effect to the core quality of continuous casting billet.
And seventhly, reheating and lubricating, wherein the temperature of the continuous casting blank after hole expansion is reduced, so that the continuous casting blank is quickly heated by an induction furnace again, and the heating temperature is 1180 ℃. In order to reduce the friction between the continuous casting billet and the extrusion cylinder and the core rod, an alkali powder lubricant is added into the inner hole, and a glass powder lubricant is rolled 844-7 on the outer surface.
And eighthly, preparing and extruding a tool and a die, wherein in order to reduce the cooling of the continuous casting blank after contacting the tool and the die, the extrusion container needs to be preheated by 220 ℃ and the core rod needs to be preheated by 330 ℃. After the continuous casting billet enters the extrusion container, the core rod rapidly extends into the inner hole, the extrusion speed is 280mm/s, the extrusion force is 24MN, the outer diameter of the extruded finished pipe is 89mm, the wall thickness is 6.45mm, and the length is 9800 mm.
Example 3
A manufacturing method of a martensitic stainless steel continuous casting billet extrusion seamless tube comprises the following steps:
firstly, preparing a blank, wherein the material of the continuous casting billet is L80-9Cr, and the specification of the continuous casting billet is phi 310 mm.
Secondly, peeling and segmenting, wherein peeling processing is required due to the fact that the surface of the continuous casting billet is rough, the processing specification is phi 299mm, and the segment length is 634 mm;
and thirdly, drilling and machining the bell mouth, wherein the continuous casting blank has the defects of looseness, shrinkage and the like at the core part which are not beneficial to extrusion, but the extrusion process has the characteristics that the blank needs to be drilled at the center, the diameter of the drilled hole is 65mm, the bell mouth is machined at the end part, and the taper of the bell mouth is 42 degrees.
And fourthly, cleaning and preheating, wherein oil stains exist on the surface of the processed continuous casting billet, so that the continuous casting billet needs to be cleaned by adopting alkali liquor. Because stainless steel has relatively poor heat conductivity, low-temperature preheating is needed, and the preheating temperature is 800 ℃;
and fifthly, heating and coating a lubricant, wherein the continuous casting slab needs to be rapidly heated by an induction furnace, and the heating temperature is 1160 ℃. The reaming barrel and the continuous casting slab have intermetallic surface friction and large friction force during reaming, so that a lubricant is required to be rolled on the surface of the continuous casting slab, and the lubricant is 844-7 glass powder.
Sixthly, core lubrication and hole expansion are carried out, a lubricant is placed at the position of the bell mouth, and the lubricant is medium alkali powder and is filled. Adopt phi 158mm reaming head to aim at the center, accomplish the reaming under the effect of reaming pole, because the reaming process is little deflection, just play the improvement effect to the core quality of continuous casting billet.
And seventhly, reheating and lubricating, wherein the temperature of the continuous casting blank after hole expanding is already reduced, so that the continuous casting blank is rapidly heated by an induction furnace again, and the heating temperature is 1200 ℃. In order to reduce the friction between the continuous casting billet and the extrusion cylinder and the core rod, an alkali powder lubricant is added into the inner hole, and a glass powder lubricant is rolled 844-7 on the outer surface.
And eighthly, preparing and extruding a tool and a die, wherein in order to reduce the cooling of the continuous casting blank after contacting the tool and the die, the extrusion cylinder needs to be preheated by 260 ℃ and the core rod needs to be preheated by 350 ℃. After the continuous casting billet enters the extrusion container, the core rod rapidly extends into the inner hole, the extrusion speed is 260mm/s, the extrusion force is 44MN, the outer diameter of the extruded finished pipe is 133mm, the wall thickness is 9mm, and the length is 11000 mm.
Example 4
A manufacturing method of a martensitic stainless steel continuous casting billet extrusion seamless tube comprises the following steps:
firstly, preparing a blank, wherein the material of the continuous casting billet is L80-9Cr, and the specification of the continuous casting billet is phi 370 mm.
And step two, peeling and segmenting, wherein peeling processing is required due to the fact that the surface of the continuous casting billet is rough, the processing specification is phi 357mm, and the segment length is 767 mm.
And thirdly, drilling and machining the bell mouth, wherein the continuous casting blank has the defects of looseness, shrinkage and the like at the core part which are not beneficial to extrusion, but the extrusion process has the characteristics that the blank needs to be drilled at the center, the diameter of the drilled hole is 80mm, the bell mouth is machined at the end part, and the taper of the bell mouth is 42 degrees.
And fourthly, cleaning and preheating, wherein oil stains exist on the surface of the processed continuous casting billet, so that the continuous casting billet needs to be cleaned by adopting alkali liquor. Due to the relatively poor thermal conductivity of stainless steel, low temperature preheating is required, which is 820 ℃.
And fifthly, heating and coating the lubricant, wherein the continuous casting slab needs to be rapidly heated by an induction furnace, and the heating temperature is 1170 ℃. The reaming barrel and the continuous casting slab have intermetallic surface friction and large friction force during reaming, so that a lubricant is required to be rolled on the surface of the continuous casting slab, and the lubricant is 844-7 glass powder.
Sixthly, core lubrication and hole expansion are carried out, a lubricant is placed at the position of the bell mouth, and the lubricant is medium alkali powder and is filled. Adopt phi 181mm reaming head to aim at the center, accomplish the reaming under the effect of reaming pole, because the reaming process is little deflection, just play the improvement effect to the core quality of continuous casting billet.
And seventhly, reheating and lubricating, wherein the temperature of the continuous casting blank after hole expanding is already reduced, so that the continuous casting blank is rapidly heated by an induction furnace again, and the heating temperature is 1200 ℃. In order to reduce the friction between the continuous casting billet and the extrusion cylinder and the core rod, an alkali powder lubricant is added into the inner hole, and a glass powder lubricant is rolled 844-7 on the outer surface.
And eighthly, preparing and extruding a tool and a die, wherein in order to reduce the cooling of the continuous casting blank after contacting the tool and the die, the extrusion cylinder needs to be preheated to 230 ℃ and the core rod needs to be preheated to 330 ℃. After the continuous casting billet enters the extrusion container, the core rod rapidly extends into the inner hole, the extrusion speed is 220mm/s, the extrusion force is 52MN, the outer diameter of the extruded finished pipe is 194mm, the wall thickness is 12mm, and the length is 9500 mm.
Example 5
A manufacturing method of a martensitic stainless steel continuous casting billet extrusion seamless tube comprises the following steps:
firstly, preparing a blank, wherein the material of the continuous casting blank is improved 13Cr, 2.5 wt% of Mo alloy and 4.5 wt% of Ni alloy are added on the basis of L80-13Cr, and the specification of the continuous casting blank is phi 255 mm.
And step two, peeling and segmenting, wherein peeling processing is required due to the rough surface of the continuous casting billet, the processing specification is phi 242mm, and the segment length is 760 mm.
And thirdly, drilling and machining the bell mouth, wherein the continuous casting blank has the defects of looseness, shrinkage and the like at the core part which are not beneficial to extrusion, but the extrusion process has the characteristics that the blank needs to be drilled at the center, the diameter of the drilled hole is 45mm, the bell mouth is machined at the end part, and the taper of the bell mouth is 38 degrees.
And fourthly, cleaning and preheating, wherein oil stains exist on the surface of the processed continuous casting billet, so that the continuous casting billet needs to be cleaned by adopting alkali liquor. Since stainless steel has relatively poor thermal conductivity, low temperature preheating is required, which is 800 ℃.
And fifthly, heating and coating a lubricant, wherein the continuous casting slab needs to be rapidly heated by an induction furnace at 1180 ℃. The reaming barrel and the continuous casting slab have intermetallic surface friction and large friction force during reaming, so that a lubricant is required to be rolled on the surface of the continuous casting slab, and the lubricant is 844-7 glass powder.
Sixthly, core lubrication and hole expansion are carried out, a lubricant is placed at the position of the bell mouth, and the lubricant is medium alkali powder and is filled. Adopt 135mm of phi reaming head to aim at the center, accomplish the reaming under the effect of reaming pole, because the reaming process is little deflection, just play the improvement effect to the core quality of continuous casting billet.
And seventhly, reheating and lubricating, wherein the temperature of the continuous casting blank after hole expanding is already reduced, so that the continuous casting blank is quickly heated by an induction furnace again, and the heating temperature is 1210 ℃. In order to reduce the friction between the continuous casting billet and the extrusion cylinder and the core rod, an alkali powder lubricant is added into the inner hole, and a glass powder lubricant is rolled 844-7 on the outer surface.
And eighthly, preparing and extruding a tool and a die, wherein in order to reduce the cooling of the continuous casting blank after contacting the tool and the die, the extrusion container needs to be preheated by 250 ℃ and the core rod needs to be preheated by 360 ℃. After the continuous casting billet enters the extrusion cylinder, the core rod rapidly extends into the inner hole, the extrusion speed is 235mm/s, the extrusion force is 28MN, the outer diameter of the extruded product pipe is 139.7mm, the wall thickness is 7.72mm, and the length is 10200 mm.
Example 6
A manufacturing method of a martensitic stainless steel continuous casting billet extrusion seamless tube comprises the following steps:
firstly, preparing a blank, wherein the material of the continuous casting blank is improved 13Cr, 2.0 wt% of Mo alloy and 3.0 wt% of Ni alloy are added on the basis of L80-13Cr, and the specification of the continuous casting blank is phi 310 mm.
And step two, peeling and segmenting, wherein peeling processing is required due to the rough surface of the continuous casting billet, the processing specification is phi 299mm, and the segment length is 800 mm.
And thirdly, drilling and machining the bell mouth, wherein the continuous casting blank has the defects of looseness, shrinkage and the like at the core part which are not beneficial to extrusion, but the extrusion process has the characteristics that the blank needs to be drilled at the center, the diameter of the drilled hole is 65mm, the bell mouth is machined at the end part, and the taper of the bell mouth is 42 degrees.
And fourthly, cleaning and preheating, wherein oil stains exist on the surface of the processed continuous casting billet, so that the continuous casting billet needs to be cleaned by adopting alkali liquor. Since stainless steel has relatively poor thermal conductivity, low temperature preheating is required, which is 825 ℃.
And fifthly, heating and coating a lubricant, wherein the continuous casting billet needs to be rapidly heated by an induction furnace, and the heating temperature is 1175 ℃. The reaming barrel and the continuous casting slab have intermetallic surface friction and large friction force during reaming, so that a lubricant is required to be rolled on the surface of the continuous casting slab, and the lubricant is 844-7 glass powder.
Sixthly, core lubrication and hole expansion are carried out, a lubricant is placed at the position of the bell mouth, and the lubricant is medium alkali powder and is filled. Adopt phi 171mm reaming head to aim at the center, accomplish the reaming under the effect of reaming pole, because the reaming process is little deflection, just play the improvement effect to the core quality of continuous casting billet.
And seventhly, reheating and lubricating, wherein the temperature of the continuous casting blank after hole expanding is already reduced, so that the continuous casting blank is quickly heated by an induction furnace again, and the heating temperature is 1220 ℃. In order to reduce the friction between the continuous casting billet and the extrusion cylinder and the core rod, an alkali powder lubricant is added into the inner hole, and a glass powder lubricant is rolled 844-7 on the outer surface.
And step eight, preparing and extruding a tool and a die, wherein in order to reduce the temperature reduction of the continuous casting blank after contacting the tool and the die, the extrusion cylinder and the core rod need to be preheated by 235 ℃ and 315 ℃. After the continuous casting billet enters the extrusion container, the core rod rapidly extends into the inner hole, the extrusion speed is 260mm/s, the extrusion force is 46MN, the outer diameter of the extruded pipe is 177.8mm, the wall thickness is 9.19mm, and the length is 10500 mm.
Claims (9)
1. The manufacturing method of the martensitic stainless steel continuous casting billet extrusion seamless tube is characterized by comprising the following steps:
firstly, preparing a continuous casting blank;
secondly, peeling and segmenting, wherein peeling processing is required due to the fact that the surface of the continuous casting billet is rough, and then segmenting is carried out according to the length design of a finished product pipe;
thirdly, drilling and machining a bell mouth, drilling a hole in the center of the continuous casting billet by 30-80 mm, and chamfering the bell mouth by 35-45 degrees according to the diameter of the drilled hole;
fourthly, cleaning and preheating, wherein oil stains exist on the surface of the processed continuous casting billet, so that the continuous casting billet needs to be cleaned, and the surface carburization phenomenon caused during heating is avoided; because stainless steel has relatively poor thermal conductivity, low temperature preheating is required;
fifthly, heating and coating a lubricant, wherein the continuous casting billet needs to be rapidly heated by an induction furnace, so that high-temperature plastic deformation of stainless steel is facilitated; during reaming, the reaming barrel and the continuous casting billet belong to intermetallic surface friction, and the friction force is large, so that a lubricant needs to be rolled on the surface of the continuous casting billet;
sixthly, lubricating the core and reaming, and placing the lubricant at the position of the bell mouth to fill. The reaming head is aligned to the center, and reaming is finished under the action of the reaming rod, and the reaming process is small in deformation, so that the quality of the center of the continuous casting billet is improved;
seventhly, reheating and lubricating, wherein the continuous casting blank after reaming is cooled, so that the continuous casting blank is quickly heated by the induction furnace again; in order to reduce the friction between the continuous casting billet and the extrusion container and the core rod, a lubricant needs to be added into an inner hole and rolled on the outer surface;
eighthly, preparing a tool and a die and extruding, wherein preheating preparation needs to be carried out on an extrusion cylinder and a core rod in order to reduce the cooling of the continuous casting blank after the continuous casting blank contacts the tool and the die; after the continuous casting billet enters the extrusion container, the core rod rapidly extends into the inner hole, and extrusion is completed under the thrust of the extrusion rod.
2. The method for manufacturing a martensitic stainless steel continuous casting billet extruded seamless tube according to claim 1, wherein in the first step, the continuous casting billet is produced by using an electric furnace + LF + VD + CCM process, and the outer diameter of the continuous casting billet is as follows: phi 180-500 mm, continuous casting billet length: 1500-7000 mm.
3. The method for manufacturing a martensitic stainless steel continuous casting billet extruded seamless pipe according to claim 1, wherein the martensitic stainless steel is L80-13Cr, L80-9Cr or modified 13Cr with addition of Mo and Ni alloy.
4. The method of claim 3, wherein in the first step, the modified 13Cr is obtained by adding 0.5 to 3.0 wt% of Mo alloy and 1.0 to 6.0 wt% of Ni alloy to L80-13 Cr.
5. The method for manufacturing the martensitic stainless steel continuous casting extruded seamless pipe according to claim 1, wherein in the second step, the peeling depth is 3 to 8mm, the surface roughness after peeling is Ra6.3, and the segment length of the continuous casting is 450 to 1200 mm.
6. The manufacturing method of the martensitic stainless steel continuous casting extruded seamless tube according to claim 1, wherein in the fourth step, the processed continuous casting is cleaned by alkali liquor to remove greasy dirt, and the preheating temperature is 750-850 ℃.
7. The manufacturing method of the martensitic stainless steel continuous casting billet extrusion seamless tube according to claim 1, wherein in the fifth step, the continuous casting billet is heated by an induction furnace at the heating temperature of 1100-1180 ℃. And rolling a lubricant for the heated continuous casting billet, wherein the lubricant is glass powder, and the type of the glass powder is 844-7.
8. The manufacturing method of the martensitic stainless steel continuous casting billet extrusion seamless tube according to claim 1, wherein in the seventh step, the continuous casting billet is heated again by using an induction furnace, and the heating temperature is 1150-1220 ℃; when the lubricant is scattered on the inner surface, the continuous casting billet rotates on a tugboat.
9. The manufacturing method of the martensitic stainless steel continuous casting extruded seamless tube according to claim 1, wherein in the eighth step, the tools and dies are an extrusion cylinder, a mandrel and an extrusion die, the extrusion cylinder needs to be preheated to 200-350 ℃, and the mandrel needs to be preheated to 300-450 ℃; the extrusion speed is 150-300 mm/s, and the extrusion force is 20-63 MN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911202720.5A CN111215474A (en) | 2019-11-29 | 2019-11-29 | Manufacturing method of martensite stainless steel continuous casting billet extrusion seamless tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911202720.5A CN111215474A (en) | 2019-11-29 | 2019-11-29 | Manufacturing method of martensite stainless steel continuous casting billet extrusion seamless tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111215474A true CN111215474A (en) | 2020-06-02 |
Family
ID=70810388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911202720.5A Pending CN111215474A (en) | 2019-11-29 | 2019-11-29 | Manufacturing method of martensite stainless steel continuous casting billet extrusion seamless tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111215474A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112170519A (en) * | 2020-09-29 | 2021-01-05 | 邯郸新兴特种管材有限公司 | Production method of L80-9Cr martensitic stainless steel pipe |
| CN112317551A (en) * | 2020-09-29 | 2021-02-05 | 邯郸新兴特种管材有限公司 | Method for forming L80-13 Cr martensitic stainless steel seamless steel tube |
| CN112756474A (en) * | 2020-12-18 | 2021-05-07 | 南京工程学院 | Preparation method of GH4700 nickel-based superalloy seamless tube blank |
| CN115464056A (en) * | 2022-07-28 | 2022-12-13 | 邯郸新兴特种管材有限公司 | Hole enlarging method for producing large-diameter thin-walled tube by extrusion mode |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101612700A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | The preparation method of seamless steel tubes made of martensite precipitation hardening stainless steel |
| CN101829703A (en) * | 2010-05-17 | 2010-09-15 | 彭敦林 | Martensitic gapless stainless steel tube and manufacturing method thereof |
| CN103599957A (en) * | 2013-11-18 | 2014-02-26 | 山西太钢不锈钢股份有限公司 | Extruding molding method of austenitic stainless steel seamless pipe for hydrogenation cracking furnace |
| CN104988403A (en) * | 2015-07-09 | 2015-10-21 | 山西太钢不锈钢股份有限公司 | Martensitic stainless steel seamless steel tube for oil and gas exploitation and manufacturing method thereof |
| CN105039863A (en) * | 2015-09-02 | 2015-11-11 | 山西太钢不锈钢股份有限公司 | Manufacturing method of martensite stainless steel seamless tube for oil well |
-
2019
- 2019-11-29 CN CN201911202720.5A patent/CN111215474A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101612700A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | The preparation method of seamless steel tubes made of martensite precipitation hardening stainless steel |
| CN101829703A (en) * | 2010-05-17 | 2010-09-15 | 彭敦林 | Martensitic gapless stainless steel tube and manufacturing method thereof |
| CN103599957A (en) * | 2013-11-18 | 2014-02-26 | 山西太钢不锈钢股份有限公司 | Extruding molding method of austenitic stainless steel seamless pipe for hydrogenation cracking furnace |
| CN104988403A (en) * | 2015-07-09 | 2015-10-21 | 山西太钢不锈钢股份有限公司 | Martensitic stainless steel seamless steel tube for oil and gas exploitation and manufacturing method thereof |
| CN105039863A (en) * | 2015-09-02 | 2015-11-11 | 山西太钢不锈钢股份有限公司 | Manufacturing method of martensite stainless steel seamless tube for oil well |
Non-Patent Citations (2)
| Title |
|---|
| 徐克玷编著: "《钼的材料科学与工程》", 31 July 2014 * |
| 陆锡才，刘新编著: "《现代化超高功率电炉炼钢车间设计》", 31 December 2002 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112170519A (en) * | 2020-09-29 | 2021-01-05 | 邯郸新兴特种管材有限公司 | Production method of L80-9Cr martensitic stainless steel pipe |
| CN112317551A (en) * | 2020-09-29 | 2021-02-05 | 邯郸新兴特种管材有限公司 | Method for forming L80-13 Cr martensitic stainless steel seamless steel tube |
| CN112756474A (en) * | 2020-12-18 | 2021-05-07 | 南京工程学院 | Preparation method of GH4700 nickel-based superalloy seamless tube blank |
| CN115464056A (en) * | 2022-07-28 | 2022-12-13 | 邯郸新兴特种管材有限公司 | Hole enlarging method for producing large-diameter thin-walled tube by extrusion mode |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111215474A (en) | Manufacturing method of martensite stainless steel continuous casting billet extrusion seamless tube | |
| JP4438960B2 (en) | Seamless pipe manufacturing method | |
| CN104438419B (en) | A kind of forging molding process of high tubular aluminum alloy forge piece | |
| CN100374241C (en) | OOCr22Ni5MO3N high-nitrogen steel seamless steel pipe manufacturing method | |
| CN101811149A (en) | Manufacturing method of high alloy seamless steel tube | |
| CN112439806A (en) | Preparation method of titanium alloy seamless pipe | |
| CN103668028B (en) | Preparation method of titanium and titanium alloy seamless tube blank | |
| CN102463272A (en) | Short-flow preparation method of minor-caliber nickel-based alloy thin-wall tubes | |
| CN102371288A (en) | Preparation method of high-precision and high-strength titanium alloy seamless tube | |
| CN102672438A (en) | Process for producing metallurgical composite double metal seamless steel pipe | |
| CN102873512A (en) | Manufacture method of large-caliber medium-and-thick-wall seamless steel tube for nuclear power plant | |
| CN104070078A (en) | Ultrahigh-pressure hydrostatic extrusion forming technology of magnesium alloy pipe and extrusion mold | |
| CN105568195A (en) | Preparation method for high-accuracy and high-strength titanium alloy seamless tubes | |
| CN104043677A (en) | Preparation method of carbon steel tube/stainless steel tube composite tube | |
| CN102873126B (en) | Manufacturing method of large-aperture thin-walled seamless steel tube for nuclear power plant | |
| CN104174807B (en) | The manufacture method of a kind of heavy caliber titanium thick-wall tube | |
| CN106216965B (en) | A kind of casting and rolling composite forming method of corronium retainer | |
| CN103962403B (en) | Heavy caliber pipe squeezes to pull out and subtracts wall method | |
| CN104625594B (en) | The method of manufacturing technology of rotor of large turbo-type generator profiled-cross-section connector copper pipe | |
| CN112894276B (en) | Deep blind hole cylindrical component and manufacturing method thereof | |
| CN104307921A (en) | Seamless steel tube production process | |
| CN108044315A (en) | A kind of manufacturing method of heavy caliber bimetallic composite corrosion proof seamless tubular goods | |
| CN104772603B (en) | Forming process method for eccentric aluminum alloy reducing tube | |
| CN203695839U (en) | Combined closed-type forming die for method of forging tubular parts of seamless tube | |
| CN106881367A (en) | A kind of Ti-Ni base memorial alloys hot extrusion lubricating method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200602 |