CN103805896A - Preparation method of seamless stainless steel pipe for large-size boilers - Google Patents
Preparation method of seamless stainless steel pipe for large-size boilers Download PDFInfo
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- CN103805896A CN103805896A CN201210445292.0A CN201210445292A CN103805896A CN 103805896 A CN103805896 A CN 103805896A CN 201210445292 A CN201210445292 A CN 201210445292A CN 103805896 A CN103805896 A CN 103805896A
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Abstract
The present invention discloses a preparation method of a seamless stainless steel pipe for large-size boilers. The preparation method comprises: 1) carrying out smelting and continuous casting, wherein steelmaking adopts high-quality scrap steel, sponge iron, hot metal and an alloy mother liquor to prepare and melt into liquid steel, a short process route comprising electric furnace, refining, vacuum furnace, wire feeding treatment and continuous casting is adopted, microalloying, pure steel smelting and inclusion degeneration are combined, and die casting is performed to obtain a round steel billet; 2) carrying out hot extrusion, wherein the stainless steel billet is heated to a temperature of 1170-1190 DEG C in a heating furnace, and then is subjected to hot extrusion on an extruder; 3) carrying out heat treatment, straightening and polishing; 4) heating the steel billet to a temperature of 1170-1190 DEG C in the heating furnace, carrying out hot piercing, carrying out continuous rolling, cooling, and carrying out saw cutting, wherein the rolling temperature is 950-1130 DEG C, the sizing temperature is 900-950 DEG C, and the cooling is performed on a cooling bed; and 5) carrying out deoiling, heat treatment, straightening, cleaning, polishing and inspection after cold rolling.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, relate in particular to the preparation method of a kind of large-sized boiler gapless stainless steel tube.
Background technology
Large-sized boiler adopts Special Alloy Steel to make with gapless stainless steel tube, mainly contains in the world at present two kinds of modes and produces this steel pipe, and a kind of is that German Mannasman company adopts the technique of " car outside interior building ".But this method metal loss in the process of producing is large, and production efficiency is low, and input cost is high; Another kind is the extrusion process of Wei Mangaodeng company of the U.S..Then it carried out extrusion molding the steel ingot crimp after punching become to hollow billet, then be polished into steel pipe by distortion that continuous casting steel ingot is punched.This method production efficiency is higher.
At present, its maximum caliber of product that China's stainless-steel seamless pipe industry is produced is at present 630mm, and the product coming into the market is below 600mm.Existing this large-caliber stainless steel seamless pipe is all to adopt traditional technology, and its processing step is: 1, hollow forging; 2, pickling; 3, reconditioning; 4, lubricated; 5, dry up; 6, soldering tip; 7, cold-drawn; 8, deoil; 9, thermal treatment; 10, aligning; 11, reconditioning; 12, lubricated; 13, cold-drawn; 14, deoil; 15, aligning; 16, Pipe Cutting; 17, finished product acid-washing; 18, packing warehouse-in.Wherein, in above-mentioned processing step, lubricant proportioning is: Calcium hydrogen carbonate (lime)/industrial grease (butter) ratio is: 10: 10.
When the shortcoming of above-mentioned technique is exactly cold-drawn, lubricant effect is undesirable, does not reach the required degree of lubrication of cold-drawn, and when cold-drawn, steel pipe easily cracks.
Summary of the invention
The preparation method who the object of the invention is to propose a kind of large-sized boiler gapless stainless steel tube, stainless steel tube prepared by the method can overcome the defect of prior art, has good obdurability and erosion resistance.
For reaching this object, the present invention by the following technical solutions:
A preparation method for gapless stainless steel tube for large-sized boiler, the chemical composition of this stainless steel tube is made up of following component by weight percentage: C:0.01-0.03, Si:0.08-0.12, Mn:1.3-1.5, S :≤0.010, P :≤0.015, Ni:0.7-0.9, Cr:17.0-19.0, Mo:1.0-1.2, Ce:0.05-0.15, N:0.05-0.07, Nb:0.03-0.05, B:0.003-0.005, surplus is iron and inevitable impurity;
Described preparation method comprises the steps:
1) smelt continuous casting: steel-making adopts high-quality steel scrap, sponge iron, molten iron and the preparation of alloy mother liquor to be fused into after molten steel, by abbreviated system route electric furnace, refining, vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, be molded into circular billet;
2) hot extrusion: stainless steel steel billet is heated to 1170-1190 ℃ in process furnace, then carries out hot extrusion on extrusion machine;
3) heat-treat, aligning, polishing;
4) steel billet is heated in process furnace to 1170-1190 ℃, carries out hot piercing, then carry out continuous rolling, rolling temperature is 950-1130 ℃, and sizing temperature is 900-950 ℃, cooling, and sawing is cooling on cold bed;
5) after cold rolling, deoil, thermal treatment, aligning, cleaning, polishing, check.
The present invention has following beneficial effect:
The present invention is on the basis of great many of experiments, stainless chemical composition is adjusted, improve stainless obdurability and processing characteristics by the content of adjusting Ni, Cr, Mo, by adding appropriate Ce and coordinating appropriate N and B to improve microtexture, improve its processing characteristics by adding appropriate Nb.Each alloying element plays coordination technique effect in stainless steel, makes stainless excellent performance.
Production technique of the present invention is simple, easily control, thereby production efficiency is high, and cost is low, and the diameter of the gapless stainless steel tube of preparation can reach 650mm.
Embodiment
Embodiment mono-
A preparation method for gapless stainless steel tube for large-sized boiler, the chemical composition of this stainless steel tube is made up of following component by weight percentage: C:0.01, Si:0.12, Mn:1.3, S :≤0.010, P :≤0.015, Ni:0.9, Cr:17.0, Mo:1.2, Ce:0.05, N:0.07, Nb:0.03, B:0.005, surplus is iron and inevitable impurity; Described preparation method comprises the steps:
1) smelt continuous casting: steel-making adopts high-quality steel scrap, sponge iron, molten iron and the preparation of alloy mother liquor to be fused into after molten steel, by abbreviated system route electric furnace, refining, vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, be molded into circular billet;
2) hot extrusion: stainless steel steel billet is heated to 1170 ℃ in process furnace, then carries out hot extrusion on extrusion machine;
3) heat-treat, aligning, polishing;
4) steel billet is heated in process furnace to 1170 ℃, carries out hot piercing, then carry out continuous rolling, rolling temperature is 950-1130 ℃, and sizing temperature is 900-950 ℃, cooling, and sawing is cooling on cold bed;
5) after cold rolling, deoil, thermal treatment, aligning, cleaning, polishing, check.
Embodiment bis-
A preparation method for gapless stainless steel tube for large-sized boiler, the chemical composition of this stainless steel tube is made up of following component by weight percentage: C:0.03, Si:0.08, Mn:1.5, S :≤0.010, P :≤0.015, Ni:0.7, Cr:19.0, Mo:1.0, Ce:0.15, N:0.05, Nb:0.05, B:0.003, surplus is iron and inevitable impurity; Described preparation method comprises the steps:
1) smelt continuous casting: steel-making adopts high-quality steel scrap, sponge iron, molten iron and the preparation of alloy mother liquor to be fused into after molten steel, by abbreviated system route electric furnace, refining, vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, be molded into circular billet;
2) hot extrusion: stainless steel steel billet is heated to 1190 ℃ in process furnace, then carries out hot extrusion on extrusion machine;
3) heat-treat, aligning, polishing;
4) steel billet is heated in process furnace to 1190 ℃, carries out hot piercing, then carry out continuous rolling, rolling temperature is 950-1130 ℃, and sizing temperature is 900-950 ℃, cooling, and sawing is cooling on cold bed;
5) after cold rolling, deoil, thermal treatment, aligning, cleaning, polishing, check.
Embodiment tri-
A preparation method for gapless stainless steel tube for large-sized boiler, the chemical composition of this stainless steel tube is made up of following component by weight percentage: C:0.02, Si:0.10, Mn:1.4, S :≤0.010, P :≤0.015, Ni:0.8, Cr:18.0, Mo:1.1, Ce:0.10, N:0.06, Nb:0.04, B:0.004, surplus is iron and inevitable impurity; Described preparation method comprises the steps:
1) smelt continuous casting: steel-making adopts high-quality steel scrap, sponge iron, molten iron and the preparation of alloy mother liquor to be fused into after molten steel, by abbreviated system route electric furnace, refining, vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, be molded into circular billet;
2) hot extrusion: stainless steel steel billet is heated to 1180 ℃ in process furnace, then carries out hot extrusion on extrusion machine;
3) heat-treat, aligning, polishing;
4) steel billet is heated in process furnace to 1180 ℃, carries out hot piercing, then carry out continuous rolling, rolling temperature is 950-1130 ℃, and sizing temperature is 900-950 ℃, cooling, and sawing is cooling on cold bed;
5) after cold rolling, deoil, thermal treatment, aligning, cleaning, polishing, check.
Claims (1)
1. a preparation method for gapless stainless steel tube for large-sized boiler, is characterized in that, the chemical composition of this stainless steel tube is made up of following component by weight percentage: C:0.01-0.03, Si:0.08-0.12, Mn:1.3-1.5, S :≤0.010, P :≤0.015, Ni:0.7-0.9, Cr:17.0-19.0, Mo:1.0-1.2, Ce:0.05-0.15, N:0.05-0.07, Nb:0.03-0.05, B:0.003-0.005, surplus is iron and inevitable impurity; Described preparation method comprises the steps:
1) smelt continuous casting: steel-making adopts high-quality steel scrap, sponge iron, molten iron and the preparation of alloy mother liquor to be fused into after molten steel, by abbreviated system route electric furnace, refining, vacuum oven, feed a silk processing, continuous casting and in conjunction with microalloying, Clean Steel smelt, inclusion modification, be molded into circular billet;
2) hot extrusion: stainless steel steel billet is heated to 1170-1190 ℃ in process furnace, then carries out hot extrusion on extrusion machine;
3) heat-treat, aligning, polishing;
4) steel billet is heated in process furnace to 1170-1190 ℃, carries out hot piercing, then carry out continuous rolling, rolling temperature is 950-1130 ℃, and sizing temperature is 900-950 ℃, cooling, and sawing is cooling on cold bed;
5) after cold rolling, deoil, thermal treatment, aligning, cleaning, polishing, check.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210445292.0A CN103805896A (en) | 2012-11-08 | 2012-11-08 | Preparation method of seamless stainless steel pipe for large-size boilers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210445292.0A CN103805896A (en) | 2012-11-08 | 2012-11-08 | Preparation method of seamless stainless steel pipe for large-size boilers |
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| Publication Number | Publication Date |
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| CN103805896A true CN103805896A (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210445292.0A Pending CN103805896A (en) | 2012-11-08 | 2012-11-08 | Preparation method of seamless stainless steel pipe for large-size boilers |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499582A (en) * | 2015-12-08 | 2016-04-20 | 中国核动力研究设计院 | Preparation method of high-boron boronated stainless steel |
| CN107008767A (en) * | 2017-03-23 | 2017-08-04 | 浙江久立特材科技股份有限公司 | A kind of Ni-based less-deformable alloy pipe joint hot-working method |
-
2012
- 2012-11-08 CN CN201210445292.0A patent/CN103805896A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499582A (en) * | 2015-12-08 | 2016-04-20 | 中国核动力研究设计院 | Preparation method of high-boron boronated stainless steel |
| CN107008767A (en) * | 2017-03-23 | 2017-08-04 | 浙江久立特材科技股份有限公司 | A kind of Ni-based less-deformable alloy pipe joint hot-working method |
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Application publication date: 20140521 |
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