CN101693941B - Method for quenching medium and low carbon alloy structural steel workpieces - Google Patents
Method for quenching medium and low carbon alloy structural steel workpieces Download PDFInfo
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- CN101693941B CN101693941B CN2009101623494A CN200910162349A CN101693941B CN 101693941 B CN101693941 B CN 101693941B CN 2009101623494 A CN2009101623494 A CN 2009101623494A CN 200910162349 A CN200910162349 A CN 200910162349A CN 101693941 B CN101693941 B CN 101693941B
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Abstract
The invention discloses a method for quenching medium and low carbon alloy structural steel workpieces, which comprises the following steps: a, placing medium and low carbon alloy structural steel workpieces to be quenched into a quenching furnace, heating until the furnace temperature is higher than normal austenitizing temperature by 100-200 DEG C for preserving the temperature till the workpieces are sufficiently burnt; b, selecting quenching liquid corresponding to materials of the workpieces, adding the quenching liquid into a quenching groove and intensively stirring; sufficiently burning and then placing the workpieces into the quenching liquid to quench. The quenching method can overcome the defects of large energy consumption, poor environmental protection, and the like in the prior art so as to realize the advantages of low energy consumption, good environmental protection, high toughness and difficult rustiness and can meet the requirement of low-temperature impact toughness of a hoisting rigging industry.
Description
Technical field
The present invention relates to the heat-treatment quenching technology, particularly, in relating to, the quenching method of low-carbon alloy structural steel product.
Background technology
In traditional thermal treatment, in, the low-carbon alloy structural steel product rule of quenching is: at the stagnation point Ac3+ of steel (30～50 ℃), behind the heat tracing, put into oil or water and carry out quench treatment.
In recent ten years, along with aqueous polymer class quenchant popularize, use and to the going deep into of quench cooled process mechanism research, quenching technique has had new progress, has developed some new quenching techniques, as strong quenching technology.In addition, in novel quenching heating techniques such as austenite crystal super-refinement, intercritical hardening, medium carbon steel quench hot, the technology of the obdurability that improves steel all there is report.
But in realizing process of the present invention, the contriver finds that the high temperature rapid heating technology is all done things in his own way with strong quenching technique in the prior art, uses separately, can organically not combine together as yet, and be used for the thermal treatment of same workpiece; And in traditional type of heating, the thermal treatment soaking time is longer, and energy consumption is big; In addition, quenching oil volatilizees in high temperature, causes environmental pollution easily.
Summary of the invention
The objective of the invention is to, at the problems referred to above, in the proposition, the quenching method of low-carbon alloy structural steel product, with realize that energy consumption is low, the feature of environmental protection good, obdurability and the advantage that is difficult for getting rusty, can satisfy the demand of Current Collector Sleave industry low-temperature impact toughness.
For achieving the above object, the technical solution used in the present invention is: in a kind of, the quenching method of low-carbon alloy structural steel product, comprise the steps: a, will be to be quenched in, the low-carbon alloy structural steel product is placed in the quenching furnance, be heated to furnace temperature when being higher than normal austenitizing temperature 100-200 ℃, be incubated, burn thoroughly until described product; B, the selection hardening liquid corresponding with the material of described product add quenching tank, and vigorous stirring; After waiting to burn, described product is put into described hardening liquid, quench.
Further, in step a: described normal austenitizing temperature comprises: the normal austenitizing temperature of hypoeutectoid steel is AC
3+ (30-50) ℃, the normal austenitizing temperature of eutectoid steel and hypereutectoid steel is AC
1+ (30-50) ℃; The time t of described insulation by formula t=KD calculates, and wherein, K is the soaking time coefficient, and K gets 0.1-0.5min/mm, and D is the effective thickness of described product.
Further, in step b, described vigorous stirring is specially: adopt agitator motor to stir hardening liquid, the rotating speed 〉=1440r/min of described agitator motor.
Further, in step b, described hardening liquid is the NaCl aqueous solution, and the volumetric concentration of the described NaCl aqueous solution is 5-15%, quenching intensity H 〉=4.
Wherein, the material of described product be contain 20Cr, 20CrMnTi, Q345 and 35CrMo in the ferrous metal of low hardening capacity material.
Further, in step b, described hardening liquid is water-soluble polymers hardening liquid UCONA, and the volumetric concentration of described UCONA is that 2-25%, quenching intensity H are 1.5-4.
Wherein, the material of described product is the ferrous metal that contains the middle high-hardenability material of 20SiMn2MoV, 35CrMo, 42CrMo and 40CrNiMo.
In the various embodiments of the present invention, the quenching method of low-carbon alloy structural steel product, to be higher than normal austenitizing temperature 100-200 ℃ furnace temperature, rapid heating to be quenched in, the low-carbon alloy structural steel product, insulation is burnt to saturating, utilize high temperature rapid heating mode to replace traditional type of heating, can shorten heat treated soaking time greatly, energy-saving effect is remarkable; After saturating the burning, material according to product, select corresponding NaCl solution or UCONA solution to make hardening liquid, vigorous stirring hardening liquid in quenching tank is put into the quenching tank of corresponding hardening liquid with product, quenches, utilize NaCl solution or UCONA solution to make hardening liquid, can increase the effective case depth of product, the while can be removed the environmental pollution due to the quenching oil vaporization at high temperature from, improves operating environment greatly; Here, high temperature rapid heating austenitizing technology and strong quenching technology are combined together, centering, the low-carbon alloy structural steel product is heat-treated, in can making, the low-carbon alloy structural steel product is in the martensite range, carry out Rapid and uniform cooling, thereby form the quenched case that one deck has high pressure stress on the surface, when increasing effective case depth, make medium carbon structural alloy steel obtain more dish shape martensite, make low-carbon alloy structural steel obtain more lath martensite, after tempered, can effectively improve obdurability, the especially low-temperature impact toughness of steel alloy product; In addition, this quenching method is easy and simple to handle, is easy to grasp, and undistorted and rimose risk is especially made the product of hardening liquid with UCONA, also have need not clean, and tempering after the rustless effect of product; Thereby can overcome the defective of the big and feature of environmental protection difference of energy consumption in the prior art, low with the realization energy consumption, the feature of environmental protection good, obdurability and the advantage that is difficult for getting rusty, can satisfy the demand of Current Collector Sleave industry low-temperature impact toughness.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification sheets, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification sheets of being write, claims and accompanying drawing.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Embodiment one
According to the embodiment of the invention, provide a kind of in, the quenching method of low-carbon alloy structural steel product.In the present embodiment, in, the quenching method of low-carbon alloy structural steel product comprises:
Step 101: in will be to be quenched, the low-carbon alloy structural steel product is placed in the quenching furnance, carries out heating with full power, when treating that furnace temperature is higher than normal austenitizing temperature 100-200 ℃, is incubated, burn thoroughly until this product;
In step 101, normal austenitizing temperature comprises: the normal austenitizing temperature of hypoeutectoid steel is AC
3+ (30-50) ℃, the normal austenitizing temperature of eutectoid steel and hypereutectoid steel is AC
1+ (30-50) ℃; The time t of insulation by formula t=KD calculates, and wherein, K is the soaking time coefficient, and K gets 0.1-0.5min/mm, and D waits to quench the wall thickness (being effective thickness) of product;
Step 102: select the hardening liquid corresponding, add quenching tank with the material of product in the step 101, and vigorous stirring; After waiting to burn, described product is put into described hardening liquid, quench;
In step 102, vigorous stirring is specially: adopt at least 4 agitator motors, with the rotating speed of separate unit 〉=1440r/min, stir hardening liquid; Wherein, the power 〉=5.5Kw of every agitator motor.
In the present embodiment, the material of product is the ferrous metal that contains low hardening capacity material among 20Cr, 20CrMnTi, Q345 and the 35CrMo etc., corresponding hardening liquid is the NaCl aqueous solution, the volumetric concentration of this NaCl aqueous solution is 5-15%, quenching intensity H 〉=4, in this volumetric concentration scope, along with the raising of NaCl concentration of aqueous solution, quenching intensity increases.Here, quenching intensity H is a relative value, it with the cooling power of 18C ° hydrostatic as standard, H=1; When greater than 1 the time, illustrate that this medium cooling power is bigger than water.
Embodiment two
Different with the foregoing description is, in the present embodiment, the material of product is the ferrous metal that contains low hardening capacity material among 20SiMn2MoV, 35CrMo, 42CrMo and the 40CrNiMo etc., corresponding hardening liquid is that (English full name is water-soluble polymers hardening liquid UCONA: UCON Quenchant A), the volumetric concentration of this UCONA is that 2-25%, quenching intensity H are 1.5-4, adjust in this volumetric concentration scope, along with the increase of concentration, quenching intensity reduces.
In the present embodiment, UCONA is the water-soluble polymers hardening liquid of being produced by U.S.'s connection carbon (Union Carbide), is fit to ferrous metal and non-ferrous metal thermal treatment.Can be used in the thermal treatment of the meshbeltfurnace of finding, be fit to various induction quenchings and flame quenching, be fit to spray and impregnating quenching mode, as parts such as gear, arbor, camshafts, and the workpiece of how much external form complexity, higher metallurgical requirement.
In the various embodiments described above, the quenching method of low-carbon alloy structural steel product, strong quenching technology as a kind of high temperature rapid heating, in can being applied to, the thermal treatment of low-carbon alloy structural steel product, be to quench with the NaCl aqueous solution or water-soluble polymers hardening liquid UCONA vigorous stirring behind the quick austenitizing of high temperature, concrete, high temperature rapid heating austenitizing and strong quenching technology are combined together, fast product is heated with the furnace temperature that is higher than normal austenitizing temperature 100-200 ℃, after the saturating burning of product, put into the NaCl aqueous solution with high-speed stirring or the quenching tank of water-soluble polymers hardening liquid UCONA according to the material selectivity, quench, wherein, quenching intensity H 〉=4 of the NaCl aqueous solution, the quenching intensity H of water-soluble polymers hardening liquid UCONA is between 1.5-4.
In sum, in the various embodiments of the present invention, the quenching method of low-carbon alloy structural steel product, can reach following beneficial effect:
(1) high temperature rapid heating austenitizing technology and strong quenching technology are combined together, be used for, the thermal treatment of low-carbon alloy structural steel, adopt the mode of high temperature rapid heating, replaced traditional type of heating, heat treated soaking time is shortened greatly, and energy-saving effect is remarkable;
(2) the NaCl aqueous solution or the water-soluble polymers hardening liquid UCONA with vigorous stirring replaced quenching oil, when increasing by quenching product effective case depth, exempted oil environmental pollution due to the volatilization in high temperature, can improve operating environment greatly;
(3) the high temperature rapid heating product that quenches strongly, in the martensite range, carry out Rapid and uniform cooling, make the surface form the quenched case that one deck has high pressure stress, when increasing effective case depth, medium carbon structural alloy steel obtains more dish shape martensite, and low-carbon alloy structural steel obtains more lath martensite, obdurability, the especially low-temperature impact toughness of steelwork have effectively been improved after tempered;
(4) this technology operation is simple, be easy to grasp, and undistorted and rimose risk, especially the product with the UCONA aqueous solution quench also has and need not clean, the rustless effect of product after the tempering.
It should be noted that at last: the above only is the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. in one kind, the quenching method of low-carbon alloy structural steel product, it is characterized in that, comprise the steps:
A, will be to be quenched in, the low-carbon alloy structural steel product is placed in the quenching furnance, is heated to furnace temperature when being higher than normal austenitizing temperature 100-200 ℃, is incubated, burn thoroughly until described product;
B, the selection hardening liquid corresponding with the material of described product add quenching tank, and vigorous stirring; After waiting to burn, described product is put into described hardening liquid, quench;
Described hardening liquid is the NaCl aqueous solution or water-soluble polymers hardening liquid UCONA.
2. in according to claim 1, the quenching method of low-carbon alloy structural steel product, it is characterized in that, in step a:
Described normal austenitizing temperature comprises: the normal austenitizing temperature of hypoeutectoid steel is AC
3+ (30-50) ℃, the normal austenitizing temperature of eutectoid steel and hypereutectoid steel is AC
1+ (30-50) ℃;
The time t of described insulation by formula t=KD calculates, and wherein, K is the soaking time coefficient, and K gets 0.1-0.5min/mm, and D is the effective thickness of described product.
3. in according to claim 1, the quenching method of low-carbon alloy structural steel product, it is characterized in that in step b, described vigorous stirring is specially: adopt agitator motor to stir hardening liquid, the rotating speed 〉=1440r/min of described agitator motor.
According among the claim 1-3 each described in, the quenching method of low-carbon alloy structural steel product, it is characterized in that in step b, described hardening liquid is the NaCl aqueous solution, the volumetric concentration of the described NaCl aqueous solution is 5-15%, quenching intensity H 〉=4.
According among the claim 1-3 each described in, the quenching method of low-carbon alloy structural steel product, it is characterized in that, in step b, described hardening liquid is water-soluble polymers hardening liquid UCONA, and the volumetric concentration of described UCONA is that 2-25%, quenching intensity H are 1.5-4.
6. in according to claim 4, the quenching method of low-carbon alloy structural steel product, it is characterized in that, the material of described product be comprise 20Cr, 20CrMnTi, Q345 and 35CrMo in low hardening capacity material.
7. in according to claim 5, the quenching method of low-carbon alloy structural steel product, it is characterized in that the material of described product is the material that comprises 20SiMn2MoV, 35CrMo, 42CrMo and 40CrNiMo.
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| CN102764953A (en) * | 2012-06-15 | 2012-11-07 | 泰安博纳金属耐磨技术有限公司 | Manufacture method for scrapping plate of coal mine scrapping plate conveyor |
| CN102876867A (en) * | 2012-10-17 | 2013-01-16 | 夏雨 | Heat treatment method of medium-high carbon steel |
| CN105401091A (en) * | 2015-09-28 | 2016-03-16 | 南京中船绿洲机器有限公司 | 42CrMo shaft part and heat treatment process thereof |
| CN107254575A (en) * | 2017-06-01 | 2017-10-17 | 马鞍山钢铁股份有限公司 | It is a kind of to remove the heat treatment method that ferrite net metallographic structure improves steel strength |
| CN108570537A (en) * | 2018-04-27 | 2018-09-25 | 共享铸钢有限公司 | A kind of production method of high rigidity low-alloy cast steel part |
| CN109321716A (en) * | 2018-11-20 | 2019-02-12 | 上海电气上重铸锻有限公司 | A kind of large size medium and low carbon steel forging shaft surface hardening heat-treating methods |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1147019A (en) * | 1996-06-20 | 1997-04-09 | 汤铁琴 | Bluing and low-carbon martensite heat treatment of high strength building steel bar |
| CN101448966A (en) * | 2006-04-03 | 2009-06-03 | 特纳瑞斯连接股份公司 | Low carbon alloy steel tube having ultra high strength and excellent toughness at low temperature and method of manufacturing the same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1147019A (en) * | 1996-06-20 | 1997-04-09 | 汤铁琴 | Bluing and low-carbon martensite heat treatment of high strength building steel bar |
| CN101448966A (en) * | 2006-04-03 | 2009-06-03 | 特纳瑞斯连接股份公司 | Low carbon alloy steel tube having ultra high strength and excellent toughness at low temperature and method of manufacturing the same |
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