CN111716254B - Crack-resistant rust-removing processing technology for long-distance transportation spiral steel pipe - Google Patents
Crack-resistant rust-removing processing technology for long-distance transportation spiral steel pipe Download PDFInfo
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- CN111716254B CN111716254B CN201910214604.9A CN201910214604A CN111716254B CN 111716254 B CN111716254 B CN 111716254B CN 201910214604 A CN201910214604 A CN 201910214604A CN 111716254 B CN111716254 B CN 111716254B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses an anti-cracking and rust-removing processing technology for a long-distance transport spiral steel pipe, which belongs to the technical field of steel pipe preparation, and adopts the technical scheme that the processing technology comprises steel belt uncoiling, roller type leveling, steel belt rust removing, head cutting, steel belt butt welding, roller sleeve forming, inner welding, outer welding, fixed length cutting and flux treatment, and the rust removing comprises the following steps: primary rust removal; preparing a rust remover for secondary rust removal, adding 15-21 parts of citric acid, 0.8-5.2 parts of sodium molybdate, 0.8-1.4 parts of phosphoric acid and 50-70 parts of water into a mixing tank in parts by weight, and stirring for 30 min; secondly, adding 0.01-0.1 part of potassium iodide into the mixed solution, and stirring for 30 minutes; secondary rust removal; oil stain treatment, wherein the oil stain treatment agent comprises 10-20 parts of sodium dodecyl benzene sulfonate, 12-16 parts of octylphenol polyoxyethylene ether, 10-14 parts of phosphoric acid and 5-9 parts of sodium lignosulphonate; and cleaning the steel strip subjected to the oil stain treatment by using clean water, and then performing the next procedure. The effect of reducing the amount of air holes at the welding seam of the spiral steel pipe is achieved.
Description
Technical Field
The invention relates to the technical field of steel pipe preparation, in particular to an anti-cracking and rust-removing processing technology for a long-distance transportation spiral steel pipe.
Background
In recent years, as development and exploitation of natural gas extend to remote areas such as deserts, polar regions, oceans and the like, long-distance pipelines not only pass through geology such as frozen soil zones, landslide zones, earthquake zones and the like, but also undergo deformation of steel pipes caused by ground collapse and movement, and may undergo enormous deformation and stress. Therefore, from the viewpoint of technical progress and pipeline safety, new and higher requirements are put forward on welded pipes and pipe fittings to ensure the safety and integrity of pipelines.
The spiral steel pipe is widely applied to industrial conveying pipelines, mechanical structural parts and the like in petroleum, chemical engineering, medical treatment, food, light industry, mechanical instruments and the like. The spiral steel pipe is made by rolling a low-carbon structural steel or low-alloy structural steel strip into a pipe blank according to a certain spiral angle and then welding the pipe seam. Before welding the spiral steel pipe, firstly uncoiling coiled steel strips, carrying out roller leveling, derusting, cutting ends, carrying out end-to-end welding on the steel strips, carrying out roller sleeve forming, carrying out internal welding and external welding, cutting to length, and carrying out flux treatment. However, the quality of the weld joint of the spiral steel pipe is a main factor influencing the service life of the spiral steel pipe, after the existing spiral steel pipe is welded, the weld joint of the pipeline has local metal fracture and pores in the weld joint, the steel belt is not cleaned cleanly in the rust removal process, the probability of the pores is improved, the local metal fracture and the pores in the weld joint influence the bearing capacity of the pipeline in the use process, and therefore the service life of the steel pipe is also shortened.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an anti-cracking and rust-removing processing technology for a long-distance transportation spiral steel pipe, and the effect of reducing the amount of air holes at the welding seam of the spiral steel pipe is achieved.
The technical purpose of the invention is realized by the following technical scheme:
a long-distance transport spiral steel pipe crack-resistant and rust-removing processing technology comprises steel belt uncoiling, roller type leveling, steel belt rust-removing, head cutting, steel belt end-to-end welding, rolling sleeve forming, inner welding, outer welding, fixed length cutting and welding flux treatment, wherein the rust-removing process comprises the following steps:
s1: carrying out primary rust removal, namely conveying the leveled steel strip to a shot blasting machine for shot blasting treatment to enable rust on the surface of the steel strip to fall off, wherein the included angle between a high-pressure nozzle of the shot blasting machine and the surface of the steel strip is 30-60 degrees;
s2: preparing a rust remover for secondary rust removal, adding 15-21 parts of citric acid, 0.8-5.2 parts of sodium molybdate, 0.8-1.4 parts of phosphoric acid and 50-70 parts of water into a mixing tank at room temperature in parts by weight, and stirring for 30 min; secondly, adding 0.01-0.1 part of potassium iodide into the mixed solution, and stirring for 30 minutes;
s3: carrying out secondary rust removal, namely carrying out surface oil stain treatment on the steel strip subjected to primary rust removal by using a rust remover, conveying the steel strip subjected to primary rust removal into a hot washing container, controlling the temperature to be between 80 and 95 ℃, spraying the rust remover by using a high-pressure spray head, and carrying out secondary cleaning on rust spots subjected to primary rust removal;
s4: performing oil stain treatment, namely performing oil stain treatment on the steel strip subjected to secondary rust removal, wherein the oil stain treatment agent comprises 10-20 parts by weight of sodium dodecyl benzene sulfonate, 12-16 parts by weight of octylphenol polyoxyethylene ether, 10-14 parts by weight of phosphoric acid and 5-9 parts by weight of sodium lignosulfonate;
s5: and cleaning the steel strip subjected to the oil stain treatment by using clean water, and then performing the next procedure.
Through adopting above-mentioned technical scheme, the existence of iron rust and moisture on the steel band, the double-layered pearl type gas pocket can appear, when the iron rust on steel band surface can not get rid of completely, the steel band warp the deformation back through the shaper, some adnexed, that clear away unclean iron rust drop, participate in the internal welding process with interior welding agent being in the same place, under the high temperature effect, the oxidation has been strengthened to the molten bath to rust release department hydrogen and oxygen, impels to generate the CO gas pocket when the crystallization, lead to spiral steel pipe's the also corresponding reduction of holding capacity.
When the rust removal is carried out on the steel strip through sand blasting firstly, the rust which is not firmly adhered to the steel strip can be removed, most of the rust on the surface of the steel strip can be removed in the sand blasting process, meanwhile, the surface of the steel strip can present certain roughness in the contact process of the sand blasting and the surface of the steel strip, the roughness on the surface of the steel strip is beneficial to reducing the resistance between fluid and the inner wall of the spiral steel tube in the use process of the spiral steel tube, so that the bearing capacity of the surface of the spiral steel tube is correspondingly reduced, the service life of the spiral steel tube is prolonged, when the clamping between a high-pressure nozzle and the surface of the steel strip is 30-60 degrees during sand blasting, the force of the sand blasting on the steel strip can be reduced, and the influence on the appearance of the spiral steel tube due to the sand blasting rust removal is reduced.
After sand blasting for rust removal, rust spots on the surface of the steel strip cannot be completely removed, so secondary rust removal is needed. The citric acid and the phosphoric acid in the rust remover belong to weak acids, so that the rust on the surface of the steel strip can be removed, meanwhile, the corrosion to the surface of the steel strip is reduced, the phosphoric acid and the sodium molybdate are mixed for use, a certain corrosion inhibition effect is achieved, the acidic substances are prevented from continuously reacting with the steel strip to influence the service life of the steel strip, and the corrosion inhibition effect of the sodium molybdate and the phosphoric acid can be enhanced by adding the potassium iodide. The citric acid, the sodium molybdate, the phosphoric acid and the potassium iodide are used in a matching way, so that the rust on the surface of the steel strip can be further removed effectively, and the influence of the rust on welding is reduced.
In the process of derusting the steel strip, some greasy dirt on the surface of the steel strip can not be completely removed, and the existence of the greasy dirt can reduce the welding performance of the steel strip, so that after the derusting agent derusts the steel strip, the independent greasy dirt on the steel strip is removed, and after the greasy dirt and the rust are removed, the corrosion of acidic substances to the steel strip in the derusting process can be reduced, meanwhile, the greasy dirt on the surface of the steel strip can be quickly removed, the later manual operation is not needed, and the processing efficiency of the spiral steel tube is improved.
The sodium dodecyl benzene sulfonate, the octyl phenol polyoxyethylene ether and the sodium lignin sulfonate can be dissolved in water, the sodium dodecyl benzene sulfonate is strong in foaming capacity and high in decontamination capacity, can be effectively combined with oily substances on the surface of a steel strip, and meanwhile, the sodium dodecyl benzene sulfonate has good surface activity and strong hydrophilicity and effectively reduces the tension of an oil-water interface, so that the contact area of the sodium dodecyl benzene sulfonate and oil stains is increased, and the decontamination capacity is improved; because the sodium dodecyl benzene sulfonate is sensitive to water hardness, the combination of the sodium dodecyl benzene sulfonate, the polyoxyethylene octylphenol ether and the sodium lignosulfonate can improve the dirt-removing capability of the sodium dodecyl benzene sulfonate and also contribute to the degradation of the polyoxyethylene octylphenol ether.
The invention is further arranged in that in S1, the included angle between the high-pressure spray head of the shot blasting machine and the surface of the steel strip is 45 degrees.
By adopting the technical scheme, when the included angle between the high-pressure spray nozzle and the surface of the steel strip is 45 degrees, the damage to the surface of the steel strip is reduced, and the rust on the surface of the steel strip can be removed, so that the roughness of the surface of the steel strip is kept consistent, and the influence on welding is reduced.
The invention is further provided that in S2, 18 parts of citric acid, 3 parts of sodium molybdate, 1.1 parts of phosphoric acid, 60 parts of water and 0.06 part of potassium iodide are added.
The invention is further configured such that, in S2, 5 to 11 parts of glycerol are added in the second step.
Through adopting above-mentioned technical scheme, glycerine is odorless, use the environmental protection, can not exert an influence to the human body, glycerine is as the solvent of citric acid, sodium molybdate, phosphoric acid and potassium iodide simultaneously, can make citric acid, sodium molybdate, phosphoric acid and potassium iodide effectively dissolve in aqueous, because glycerine has certain consistency, can improve the adhesion time of citric acid, sodium molybdate, phosphoric acid and potassium iodide and steel band in adding the rust remover with glycerine, thereby help improving the derusting effect of rust remover, also reduce the waste of rust remover simultaneously.
The invention is further configured such that, in S2, 8 parts of glycerol are added in the second step.
By adopting the technical scheme, the amount of glycerin is too small, the adhesion performance is correspondingly lower, but when the amount of glycerin is more, the consistency of the rust remover is increased, the adhesion time of the corresponding rust remover on a steel strip is increased, and the corrosion of acidic substances to the steel strip is accelerated, so that when the amount of glycerin is 6 parts, the corrosion of the acidic substances to the steel strip can be reduced, and the rust removing capability is also effectively improved.
The invention is further set that in S4, the oil stain treating agent comprises 15 parts of sodium dodecyl benzene sulfonate, 14 parts of octyl phenol polyoxyethylene ether, 12 parts of phosphoric acid and 7 parts of sodium lignosulphonate.
The invention is further provided that in S4, the oil stain treatment agent also comprises NH in parts by weight4Cl2.8-6.8 parts.
The invention is further provided that the oil stain treatment agent also comprises NH in parts by weight4Cl 5。
By adopting the technical scheme, NH4Aqueous Cl solution is weakly acidic, NH4When Cl is added into the oil stain treatment agent, further treatment can be carried out on rusty spots on the surface of the steel strip, meanwhile, ammonium ions can not react with iron, meanwhile, corrosion to the steel strip and NH can not be caused4The existence of Cl can increase the viscosity of the mixed solution of sodium dodecyl benzene sulfonate, octyl phenol polyoxyethylene ether, phosphoric acid and sodium lignosulfonate, increase the adhesive force of the oil stain treating agent and a steel belt, and effectively improve the dirt-removing capacity of the oil stain treating agent.
In conclusion, the invention has the following beneficial effects:
1. the addition of citric acid, phosphoric acid, sodium molybdate and potassium iodide can reduce corrosion to the steel pipe and remove oxides on the surface of the steel pipe, and the addition of potassium iodide can enhance the corrosion inhibition effect of sodium molybdate and phosphoric acid, prolong the service life of the steel pipe and improve the welding performance;
2. glycerol and NH4The addition of Cl can improve the binding force between the oil stain treatment agent and the steel pipe, improve the oil stain treatment efficiency, remove the residual oxides on the surface of the steel pipe, indirectly improve the welding performance of the steel pipe, reduce air holes and cracks in a welding line during welding and enable the spiral steel pipe to be suitable for length transportation.
Detailed Description
Example 1
A long-distance transport spiral steel pipe crack-resistant and rust-removing processing technology comprises steel belt uncoiling, roller type leveling, steel belt rust-removing, head cutting, steel belt end-to-end welding, rolling sleeve forming, inner welding, outer welding, fixed length cutting and welding flux treatment, wherein the rust-removing process comprises the following steps:
s1: carrying out primary rust removal, namely conveying the leveled steel strip to a shot blasting machine for shot blasting treatment to enable rust on the surface of the steel strip to fall off, wherein the included angle between a high-pressure nozzle of the shot blasting machine and the surface of the steel strip is 30 degrees;
s2: preparing a rust remover for secondary rust removal, adding 15 parts of citric acid, 0.8 part of sodium molybdate, 0.8 part of phosphoric acid and 50 parts of water into a mixing tank at room temperature in parts by weight, and stirring for 30 min; secondly, adding 0.01 part of potassium iodide and 5 parts of glycerol into the mixed solution, and stirring for 30 minutes;
s3: carrying out secondary rust removal, namely carrying out surface oil stain treatment on the steel strip subjected to primary rust removal by using a rust remover, conveying the steel strip subjected to primary rust removal into a hot washing container, controlling the temperature to be between 80 and 95 ℃, spraying the rust remover by using a high-pressure spray head, and carrying out secondary cleaning on rust spots subjected to primary rust removal;
s4: and (2) oil stain treatment, namely performing oil stain treatment on the steel strip subjected to secondary rust removal, wherein the oil stain treatment agent comprises 10 parts by weight of sodium dodecyl benzene sulfonate, 12 parts by weight of octylphenol polyoxyethylene ether, 10 parts by weight of phosphoric acid, 5 parts by weight of sodium lignosulfonate and NH4Cl2.8 parts;
s5: and cleaning the steel strip subjected to the oil stain treatment by using clean water, and then performing the next procedure.
Example 2
A long-distance transport spiral steel pipe crack-resistant and rust-removing processing technology comprises steel belt uncoiling, roller type leveling, steel belt rust-removing, head cutting, steel belt end-to-end welding, rolling sleeve forming, inner welding, outer welding, fixed length cutting and welding flux treatment, wherein the rust-removing process comprises the following steps:
s1: carrying out primary rust removal, namely conveying the leveled steel strip to a shot blasting machine for shot blasting treatment to enable rust on the surface of the steel strip to fall off, wherein the included angle between a high-pressure nozzle of the shot blasting machine and the surface of the steel strip is 45 degrees;
s2: preparing a rust remover for secondary rust removal, adding 18 parts of citric acid, 3 parts of sodium molybdate, 1.1 parts of phosphoric acid and 60 parts of water into a mixing tank at room temperature in parts by weight, and stirring for 30 min; secondly, adding 0.06 part of potassium iodide and 8 parts of glycerol into the mixed solution, and stirring for 30 minutes;
s3: carrying out secondary rust removal, namely carrying out surface oil stain treatment on the steel strip subjected to primary rust removal by using a rust remover, conveying the steel strip subjected to primary rust removal into a hot washing container, controlling the temperature to be between 80 and 95 ℃, spraying the rust remover by using a high-pressure spray head, and carrying out secondary cleaning on rust spots subjected to primary rust removal;
s4: and (2) oil stain treatment, namely performing oil stain treatment on the steel strip subjected to secondary rust removal, wherein the oil stain treatment agent comprises 15 parts by weight of sodium dodecyl benzene sulfonate, 14 parts by weight of octyl phenol polyoxyethylene ether, 12 parts by weight of phosphoric acid, 7 parts by weight of sodium lignosulfonate and NH4Cl 5 parts;
s5: and cleaning the steel strip subjected to the oil stain treatment by using clean water, and then performing the next procedure.
Example 3
A long-distance transport spiral steel pipe crack-resistant and rust-removing processing technology comprises steel belt uncoiling, roller type leveling, steel belt rust-removing, head cutting, steel belt end-to-end welding, rolling sleeve forming, inner welding, outer welding, fixed length cutting and welding flux treatment, wherein the rust-removing process comprises the following steps:
s1: carrying out primary rust removal, namely conveying the leveled steel strip to a shot blasting machine for shot blasting treatment to enable rust on the surface of the steel strip to fall off, wherein the included angle between a high-pressure nozzle of the shot blasting machine and the surface of the steel strip is 60 degrees;
s2: preparing a rust remover for secondary rust removal, adding 21 parts of citric acid, 5.2 parts of sodium molybdate, 1.4 parts of phosphoric acid and 70 parts of water into a mixing tank at room temperature in parts by weight, and stirring for 30 min; secondly, adding 0.1 part of potassium iodide and 11 parts of glycerol into the mixed solution, and stirring for 30 minutes;
s3: carrying out secondary rust removal, namely carrying out surface oil stain treatment on the steel strip subjected to primary rust removal by using a rust remover, conveying the steel strip subjected to primary rust removal into a hot washing container, controlling the temperature to be between 80 and 95 ℃, spraying the rust remover by using a high-pressure spray head, and carrying out secondary cleaning on rust spots subjected to primary rust removal;
s4: and (2) oil stain treatment, namely performing oil stain treatment on the steel strip subjected to secondary rust removal, wherein the oil stain treatment agent comprises 20 parts by weight of sodium dodecyl benzene sulfonate, 16 parts by weight of octylphenol polyoxyethylene ether, 14 parts by weight of phosphoric acid, 9 parts by weight of sodium lignosulfonate and NH4Cl6.8 parts；
S5: and cleaning the steel strip subjected to the oil stain treatment by using clean water, and then performing the next procedure.
Example 4
An anti-cracking and rust-removing processing technology for a long-distance transport spiral steel pipe is different from that of the processing technology in the embodiment 2 in that in S1, an included angle between a high-pressure spray head of a shot blasting machine and the surface of a steel belt is 30 degrees.
Example 5
An anti-cracking and rust-removing processing technology for a long-distance transport spiral steel pipe is different from that of the embodiment 2 in that in S1, an included angle between a high-pressure spray head of a shot blasting machine and the surface of a steel belt is 60 degrees.
Comparative example 1
An anti-cracking and rust-removing processing technology for a long-distance transportation spiral steel pipe is different from that in the embodiment 2 in that the rust remover does not contain glycerin.
Comparative example 2
An anti-cracking and rust-removing processing technology for a long-distance transportation spiral steel pipe, which is different from the processing technology in the embodiment 2, and the oil stain treating agent does not contain NH4Cl。
The weld joints of the spiral steel pipes produced in examples 1 to 5 and comparative examples 1 to 2 were examined, and the results are shown in Table 1.
TABLE 1 detection results of weld joints of spiral steel pipes
And (3) data analysis: in examples 1 to 3, the tensile strength, the 0 ℃ Charpy impact energy, the 0 ℃ Charpy impact shear area and the hardness in example 2 are all higher than those in examples 1 and 3, which shows that the rust removing method and the rust remover in example 2 can effectively remove the iron rust on the steel plate, thereby improving the strength of the weld joint of the spiral steel pipe and enabling the spiral steel pipe to be suitable for the performance of long-distance transportation;
comparative examples 1-2, which are obtained by comparing example 2, have no NH in the rust remover4When Cl or glycerin is used, the detection data of each performance in the comparative example 1 and the comparative example 2 are lower than that in the example 2, which shows that the oil stain treating agent is added with NH4When Cl and glycerin are used, rust and oil stains on the surface of the steel pipe can be effectively removed, so that the welding performance is improved.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. A long-distance transport spiral steel pipe crack control and rust removal processing technology comprises steel belt uncoiling, roller type leveling, steel belt rust removal, head cutting, steel belt end-to-end welding, roller sleeve forming, inner welding, outer welding, fixed length cutting and welding flux treatment, and is characterized in that the rust removal comprises the following steps:
s1: carrying out primary rust removal, namely conveying the leveled steel strip to a shot blasting machine for shot blasting treatment to enable rust on the surface of the steel strip to fall off, wherein the included angle between a high-pressure nozzle of the shot blasting machine and the surface of the steel strip is 30-60 degrees;
s2: preparing a rust remover for secondary rust removal, adding 15-21 parts of citric acid, 0.8-5.2 parts of sodium molybdate, 0.8-1.4 parts of phosphoric acid and 50-70 parts of water into a mixing tank at room temperature in parts by weight, and stirring for 30 min; secondly, adding 0.01-0.1 part of potassium iodide into the mixed solution, and stirring for 30 minutes;
s3: carrying out secondary rust removal, namely carrying out surface oil stain treatment on the steel strip subjected to primary rust removal by using a rust remover, conveying the steel strip subjected to primary rust removal into a hot washing container, controlling the temperature to be between 80 and 95 ℃, spraying the rust remover by using a high-pressure spray head, and carrying out secondary cleaning on rust spots subjected to primary rust removal;
s4: oil stain treatment, namely performing oil stain treatment on the steel strip subjected to secondary rust removal, wherein the oil stain treatment agent comprises 10-20 parts by weight of sodium dodecyl benzene sulfonate, 12-16 parts by weight of octylphenol polyoxyethylene ether, 10-14 parts by weight of phosphoric acid and 5-9 parts by weight of sodium lignosulfonate、NH4Cl2.8-6.8 parts;
s5: and cleaning the steel strip subjected to the oil stain treatment by using clean water, and then performing the next procedure.
2. The anti-cracking and rust-removing processing technology for the long-distance transport spiral steel pipe as claimed in claim 1, is characterized in that: in S1, an included angle between a high-pressure nozzle of the shot blasting machine and the surface of the steel strip is 45 degrees.
3. The anti-cracking and rust-removing processing technology for the long-distance transport spiral steel pipe as claimed in claim 1, is characterized in that: in S2, 18 parts of citric acid, 3 parts of sodium molybdate, 1.1 parts of phosphoric acid, 60 parts of water and 0.06 part of potassium iodide.
4. The anti-cracking and rust-removing processing technology for the long-distance transport spiral steel pipe as claimed in claim 1, is characterized in that: in S2, 5-11 parts of glycerol are added in the second step.
5. The anti-cracking and rust-removing processing technology for the long-distance transport spiral steel pipe as claimed in claim 4, wherein the processing technology comprises the following steps: in S2, 8 parts of glycerin are added in the second step.
6. The anti-cracking and rust-removing processing technology for the long-distance transport spiral steel pipe as claimed in claim 1, is characterized in that: in S4, the oil stain treating agent comprises 15 parts of sodium dodecyl benzene sulfonate, 14 parts of octylphenol polyoxyethylene ether, 12 parts of phosphoric acid and 7 parts of sodium lignosulphonate.
7. The anti-cracking and rust-removing processing technology for the long-distance transport spiral steel pipe as claimed in claim 1, is characterized in that: the oil stain treating agent also comprises NH in parts by weight4And Cl 5 parts.
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| US3544356A (en) * | 1967-11-01 | 1970-12-01 | Bell Telephone Labor Inc | Process for the surface treatment of aluminum and its alloys |
| AT339169B (en) * | 1975-09-25 | 1977-10-10 | Voest Ag | PROCESS FOR CLEANING AUSTENITIC MATERIAL SURFACES, IN PARTICULAR FERRITIC CONTAMINATIONS |
| JP2613317B2 (en) * | 1990-04-20 | 1997-05-28 | 川崎製鉄株式会社 | Annealing and descaling of stainless steel strip |
| JP2002371394A (en) * | 2001-06-15 | 2002-12-26 | Nippon Steel Corp | Pickling method for stainless steel |
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| CN106086904A (en) * | 2016-07-29 | 2016-11-09 | 天津市世纪道康建筑科技有限公司 | A kind of steel construction derusting anti-corrosive method |
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