CN100513616C - Low-cost steel for circular chain for mine and production process thereof - Google Patents
Low-cost steel for circular chain for mine and production process thereof Download PDFInfo
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- CN100513616C CN100513616C CNB2006100727026A CN200610072702A CN100513616C CN 100513616 C CN100513616 C CN 100513616C CN B2006100727026 A CNB2006100727026 A CN B2006100727026A CN 200610072702 A CN200610072702 A CN 200610072702A CN 100513616 C CN100513616 C CN 100513616C
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Abstract
The invention relates to a low-cost steel for circular chain for mine and production process, wherein the steel mainly comprises the following constituents (by mass percent) apart from Fe: C 0.17-0.30%, Mn 1.0-2.0%, Si 0.1-0.8%, Mo 0.1-0.5%, V 0.02-0.15%. The preparing process comprises electric furnace steel-smelting or revolving furnace + external smelting, ingot casting or continuous casting into steel billet, then rolling steel into round bars at a rolling temperature of 1200 deg. C, compression ratio >=5, and a cooling speed <=2 deg. C/s.
Description
One, technical field
The present invention relates to the ring chain steel technical field, specifically a kind of Lo-cost steel for circular chain for mine and production technique thereof.
Two, technical background
High strength mining round link chain is the important integral part of coal winning machinery and Transport Machinery, belongs to easily worn part, and consumption is big.Press national Specification, round-link chain is divided into B, C and three ranks of D.At present B level, C level round-link chain usage quantity are bigger.The starting material that are used to produce B level round-link chain are generally low-carbon alloy steel, and that extensively adopt is 20MnSi and 25MnV, reaches the mechanical property requirements of finished product round-link chain by modifier treatment.The C grade circle chain of mine has improved a rank than the B level, produces the kind dullness of C level ring chain steel at present, the employing 25MnV of small dimension (≤φ 18mm), the employing 23MnCrNiMo54 steel of big specification (〉=φ 22mm).And the problem of present homemade 23MnCrNiMo54 steel when carrying out the production of C level round-link chain is a lot, when particularly supplying in batches, the inner quality of steel, the ununiformity of tissue, discordance, cause the amount of doing over again increase in the round-link chain production process, as anneal that back hardness is inhomogeneous to influence flash welding, ftracture when causing weld seam to carry preliminary draft, even sometimes because the shearing area problem causes the hot volume of machine not carry out smoothly.The production technique and the cost of alloy of the one-tenth branch of the performance requriements of 23MnCrNiMo54 steel, regulation decision simultaneously, make the price of steel up to 10,000 yuan to 1.5 ten thousand yuan/ton, this just makes the production cost of round-link chain improve greatly, and the price of very high round-link chain just can make coal mine machinery enterprise earn a profit.Adopt external import 23MnCrNiMo54 steel, though quality reaches a standard, price is extremely expensive.
The purpose of this invention is to provide a kind of Lo-cost steel for circular chain for mine and production technique thereof.
Technical solution solution of the present invention is: the main component and the mass percent that contain beyond the deironing are as follows:
C：0.17％—0.30％；Mn：1.0％—2.0％；Si：0.1％—0.8％；Mo：0.1％-0.5％V：0.02-0.15％。
Its auxiliary composition and mass percent are: S :≤0.03%; P :≤0.03%; Cr:0.05%.The production technique of ring chain steel of the present invention is:
Electric furnace steel making or converter+external refining, ingot casting or continuous casting become steel billet, become round steel through steel rolling, 1200 ℃ of rolling temperatures, compression ratio 〉=5, cooling rate≤2 ℃/s.
Use properties according to high strength C level round-link chain requires and manufacturing technique requirent, and in conjunction with existing converter and Electric furnace steel making+continuous casting+hot rolled production process route and equipment, it is the using-system of round-link chain product that the design of steel of the present invention is based on the low carbon martensite, adopt best Mn, Mo, the multi-element alloyed effect of Cr, Si, behind Q-tempering, satisfy every mechanical property requirements of round-link chain.Simultaneously under hot-rolled condition, can obtain non-martensite microstructure, that saves the 23MnCrNiMo54 steel rolls the after annealing operation, has uniform tissue and lower hardness, the shearing blanking that helps round-link chain, when the big hot chaining of specification, can reach the weld gap uniformity, be that primary condition is created in good flash welding.
C is an important element of making big specification C level round-link chain, and it plays an important role to the plasticity of steel matrix, toughness and to the welding strength and the toughness of welding line.Studies show that under Mn content condition with higher, when matrix was bainite or martensite, C content surpassed at 0.3% o'clock, the plasticity that makes steel especially relative reduction in area and impact value are descended greatly.
Mn is the main alloy element of adding in the steel of the present invention, and it cooperates interpolation with a spot of Mo, and structural transformation kinetics that can the remarkably influenced steel plays the effect that suppresses the diffustivity structural transformation.Simultaneously, its solid solution is played the solution strengthening effect in ferrite.Consider requirement and the steel and the round-link chain production technique performance demands of round-link chain mechanical property, the addition of Mn is a ceiling with 2%.
The adding of Alloy Elements Mo, can improve the flash welding performance of steel, particularly improve the anti-overheated ability in the butt welding process, Mo and Mn combined action simultaneously, can significantly improve austenitic stability again, improve the hardening capacity of steel, reach the requirement of standard with the mechanical property of guaranteeing big specification round-link chain.
The interpolation of alloying element Si mainly is in order to improve the anti-tempering ability of steel, to improve the yield strength of steel, making the test elongation of finished product round-link chain satisfy request of national standard.Consider the increase of silicone content,, when carrying out flash welding,, produce high temperature, cause the overheated of material, because silicon is easy to oxidation, form when being mingled with simultaneously, butt welded seam is caused serious harm making the flame current of material increase with increasing the resistance of material.Therefore in the design's steel grade, different with the steel grade of being developed in the past, the content of silicon is limited, only add as additional elements, the addition of Si is lower than 0.9%.
The invention has the beneficial effects as follows: steel of the present invention is under the prerequisite of guaranteeing deep processed product round-link chain mechanical property and processing performance, compare with the 23MnNiCrMo54 steel, realize the extensive adaptability of its production technique, the Electric furnace steel making or the converter steelmaking+external refining+continuous casting+hot rolled production process route that adopt China's steel-making enterprise generally to build are produced, the anneal operation that must carry out after saving the 23MnNiCrMo54 steel and rolling, tissue, the hardness of avoiding the 23MnNiCrMo54 steel to roll after annealing causing is inhomogeneous and the problem of influence welding has been simplified production technique.Compare with 23MnCrNiMo54, saved valuable alloying element Ni, the content of Alloy Elements Mo also decreases, and significantly reduces the steel production cost.Produce big specification round-link chain at present and be approximately 20000 yuan/ton with import 23MnCrNiMo54 steel price, homemade similar steel is about 15000 yuan/ton, and steel price of the present invention is below 10000 yuan/ton.Be every index correlation data of product of the present invention and GB/T10560 below:
| Yield strength Mpa | Tensile strength Mpa | Elongation % | Relative reduction in area % | |
| Product performance | 930 | 1273 | 11.8 | 54.75 |
| Standard-required | 885 | 1080 | 9 | Do not do requirement |
Four, embodiment
Example 1: specification φ 22 round steel are produced 22 * 86C grade circle chain of mine
The composition of steel (%): C:0.22; Si:0.55; Mn:1.87; Mo:0.28; Cr:0.05; V:0.08 S:0.03%; P:0.01%.
The production technique of steel: converter+LF refining+150 billet continuous castings+be rolled into ф 22mm round steel.
1200 ℃ of rolling temperatures, compression ratio: 5, cooling rate: 1.8 ℃/s.
Round-link chain production technique: shearing blanking+heat volume+sandblast+flash welding+preliminary draft+modified thermal treatment+secondary preliminary draft---22 * 86 round-link chain finished products.
The round-link chain anti-bending strength: under+420 ℃/1.5h of 880 ℃ of quenchings tempered condition, crooked qualified (pressing the GB/T12718-91 check).
Tensile mechanical properties: breaking load: 750KN; Breaking elongation: 15%; Test elongation: 1.4%
Fatigue property: greater than 30000 times.
(standard-required: breaking load: 〉=610KN; Breaking elongation: 〉=12%; Test elongation :≤1.6%
Fatigue property: greater than 30000 times.)
Example 2: specification φ 26 round steel are produced 26 * 86C grade circle chain of mine
The composition of steel (%): C:0.29; Si:0.70; Mn:1.56; Mo:0.40; Cr:0.05; V:0.10 S:0.01%; P:0.02%.
The production technique of steel: converter+LF refining+150 billet continuous castings+be rolled into ф 26mm round steel
1200 ℃ of rolling temperatures, compression ratio: 6, cooling rate: 2 ℃/s.
Round-link chain production technique: shearing blanking+heat volume+sandblast+flash welding+preliminary draft+modified thermal treatment+secondary preliminary draft---26 * 86 round-link chain finished products
The round-link chain anti-bending strength: under+420 ℃/1.5h of 880 ℃ of quenchings tempered condition, crooked qualified (pressing the GB/T12718-91 check).
Tensile mechanical properties: breaking load: 920KN; Breaking elongation: 16%; Test elongation: 1.2%
Fatigue property: greater than 30000 times.
(standard-required: breaking load: 〉=850KN; Breaking elongation: 〉=12%; Test elongation :≤1.6%
Fatigue property: greater than 30000 times)
Example 3: specification φ 22 round steel are produced 22 * 86C grade circle chain of mine
The composition of steel (%): C:0.20; Si:0.15; Mn:1.25; Mo:0.30; Cr:0.05; V:0.06 S:0.01%; P:0.01%
The production technique of steel: converter+LF refining+150 billet continuous castings+be rolled into ф 22mm round steel
1200 ℃ of rolling temperatures, compression ratio: 5, cooling rate: 1.8 ℃/s.
Round-link chain production technique: shearing blanking+heat volume+sandblast+flash welding+preliminary draft+modified thermal treatment+secondary preliminary draft---22 * 86 round-link chain finished products
The round-link chain anti-bending strength: under+420 ℃/1.5h of 880 ℃ of quenchings tempered condition, crooked qualified (pressing the GB/T12718-91 check).
Tensile mechanical properties: breaking load: 720KN; Breaking elongation: 16%; Test elongation: 1.3%
Fatigue property: greater than 30000 times.
(standard-required: breaking load: 〉=610KN; Breaking elongation: 〉=12%; Test elongation :≤1.6%
Fatigue property: greater than 30000 times.)
Claims (1)
1, a kind of production technique of Lo-cost steel for circular chain for mine, this steel grade comprise that the main component and the mass percent that contain beyond the deironing are as follows: C:0.17%--0.30%; Mn:1.0%-2.0%; Si:0.1%-0.8%; Mo:0.1%-0.5%; V:0.02-0.15%; Auxiliary composition and mass percent are as follows: S:0.03%; P:0.03%; Cr:0.05%; It is characterized by: electric furnace or converter steelmaking+external refining, ingot casting or continuous casting become steel billet, become round steel through steel rolling, 1200 ℃ of rolling temperatures, compression ratio 〉=5, cooling rate≤2 ℃/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100727026A CN100513616C (en) | 2006-04-07 | 2006-04-07 | Low-cost steel for circular chain for mine and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100727026A CN100513616C (en) | 2006-04-07 | 2006-04-07 | Low-cost steel for circular chain for mine and production process thereof |
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| CN1827822A CN1827822A (en) | 2006-09-06 |
| CN100513616C true CN100513616C (en) | 2009-07-15 |
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| CNB2006100727026A Expired - Fee Related CN100513616C (en) | 2006-04-07 | 2006-04-07 | Low-cost steel for circular chain for mine and production process thereof |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397636B (en) * | 2007-09-25 | 2010-12-01 | 宝山钢铁股份有限公司 | High toughness ring chain steel for mine and method for producing the same |
| CN101709431B (en) * | 2009-12-10 | 2011-08-24 | 南京钢铁股份有限公司 | Round steel and production process thereof |
| CN102534171A (en) * | 2011-12-02 | 2012-07-04 | 中煤张家口煤矿机械有限责任公司 | Self tempering method in heat treatment of high-strength round-link chain monocyclic ring |
| CN103911546B (en) * | 2014-04-17 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of low cost steel plate and production method thereof |
| CN106498116B (en) * | 2016-10-27 | 2018-09-18 | 首钢水城钢铁（集团）有限责任公司 | A kind of production technology of circle chain of mine steel |
| CN106967924B (en) * | 2017-04-19 | 2018-06-01 | 宣化钢铁集团有限责任公司 | Heavy-duty loader tire protection chain steel and its production method |
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