CN103131836A - Stepping type heating furnace for heat treatment - Google Patents
Stepping type heating furnace for heat treatment Download PDFInfo
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- CN103131836A CN103131836A CN2013100970997A CN201310097099A CN103131836A CN 103131836 A CN103131836 A CN 103131836A CN 2013100970997 A CN2013100970997 A CN 2013100970997A CN 201310097099 A CN201310097099 A CN 201310097099A CN 103131836 A CN103131836 A CN 103131836A
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Abstract
The invention discloses a stepping type heating furnace for heat treatment. The stepping type heating furnace has the advantages that the longest rolling distance of a sleeve is enabled to be smaller than the length of working sides, so that the sleeve cannot stop at tooth bottoms, the heating is more uniform, the requirements on heating temperature control accuracy can be lowered, and the energy sources are saved. According to the stepping type heating furnace, a right-angle triangle is formed by a vertical line passing through the tooth top of each working tooth, a horizontal line passing through the tooth bottom of the same working tooth, and a straight line interconnecting the tooth top and tooth bottom of the working tooth, the angle of the right-angle triangle in which the tooth top is located is 78 degrees, the angle in which the tooth bottom is located is 12 degrees, the connecting line of the tooth top and tooth bottom of the working tooth serves as one working side, the working side is of a tooth shape with an exponential curve, and the exponential curve is a formula shown in a drawing. Due to the tooth shape design, the longest rolling distance of the sleeve is enabled to be smaller than the length of working sides when the sleeve rolls on the working sides of the teeth of a stepping beam and a fixed beam, so that the sleeve cannot stop at the tooth bottoms, the heating is more uniform, the generation of tissue difference and external diameter deformation is avoided, and the quality of produces is improved.
Description
Technical field
The invention belongs to the Field of Heat-treatment of metallic substance, particularly relate to a kind of for heat treated walking beam furnace and heat treating method.
Background technology
Oil pipes refers to oil pipe, sleeve pipe and the drilling rod that a class is specifically designed to petroleum and natural gas exploration, probing and exploitation, is the important equipment of petroleum industry, and the domestic oil dedicated pipe is mainly to adopt hot rolling or cold-drawn to make.
Along with the continuous rising of petroleum consumption and the lifting of China's equipment manufacture integral level, the development of China's oil drilling specific equipment manufacturing rapidly.But the characteristics that due to the singularity of oil production security, that oil pipes has is high in technological content, added value is high, the mechanical property of requirement, corrosion resistance, dimensional precision are all very high, generally need to adopt highly malleablized thermal treatment to improve mechanical property.
At present, oil pipes all adopts walking beam furnace to heat-treat.But, because top and the bottom of walking beam furnace exists temperature head, this temperature head can pass to oil pipes when soaking, make top and the bottom and the surfaces externally and internally of oil pipes produce the irregular phenomenon of heating, cause cooled oil pipes to produce the problems such as histological difference and external diameter distortion; Affect dimensional precision and the mechanical property of oil pipes, even affect the corrosion resistance of tubing, cause oil pipes flexural deformation to occur when serious, cause quality product to descend.
At present, for the outside surface that solves sleeve pipe and inner thermogenesis irregular and the furnace roof of process furnace and the temperature head of bottom of adding, to when heating, sleeve pipe pass to sleeve pipe, make cooled sleeve pipe produce the problems such as histological difference and external diameter distortion, existing walking beam furnace technology is mainly by the temperature head in strict control stove, in the general requirement stove temperature head be no more than ± 5 ℃; Strengthen the size of process furnace, the quantity of the burner noz(zle) that gathers improves the combustion heat value of unit time; Be strict with heating cycle and Controlling System in stove, improve the ununiformity of temperature in stove; Sleeve pipe is moved while turning round, and reduce non-uniform temperature phenomenon etc. guarantee the temperature of homogenizing process furnace.But, design reasons due to profile of tooth, pitch and horizontal throw etc. on walking beam furnace fixed beam and walking beam, when sleeve pipe rolls on the working edge of tooth, be all be rolled to tooth from tooth top at the bottom of, stop the regular hour at the bottom of tooth, can not thoroughly change the problem of the heating inequality that causes due to the design of process furnace self structure.And it is larger that strict temperature control requirement implements difficulty, not only improved the running cost of equipment, strengthened the production cost of enterprise, slightly has error will cause product defective, affects the qualification rate of product.Simultaneously, increase the consumption that burner quantity has also strengthened the energy.
Summary of the invention
The objective of the invention is for the technological deficiency that exists in prior art, and provide a kind of the longest rolling distance of sleeve pipe that can make less than the length of working edge, cause sleeve pipe not stop at the bottom of tooth, heat more even, can reduce the control accuracy requirement of Heating temperature, save energy be used for heat treated walking beam furnace.
For realizing that the technical scheme that purpose of the present invention adopts is:
a kind of for heat treated walking beam furnace, comprise fixed beam and walking beam, be respectively arranged with a plurality of work teeth on described fixed beam and walking beam, it is characterized in that, the vertical line of the tooth top of each described work tooth of process, through the sea line at the bottom of the tooth of identical work tooth and connect the tooth top of this work tooth and the rectilinear(-al) right-angle triangle at the bottom of tooth, the angle at tooth top place described in described right-angle triangle is 78 °, described in described right-angle triangle at the bottom of tooth the angle at place be 12 °, at the bottom of the tooth top of described work tooth and tooth, line is working edge, the face at described working edge place is as working face, described working edge is the profile of tooth with index curve, the pitch of described work tooth is greater than the horizontal throw of walking beam, the starting point of described index curve is the tooth top of work tooth, at the bottom of terminal point is the tooth of work tooth, described index curve is
On working edge, the vertical range of the horizontal direction square edge of any point P and right-angle triangle is
In formula:
S is that on working edge, any point vertical direction extends to the intersection point of the hypotenuse of described right-angle triangle to the distance through the vertical line of tooth top;
B is the vertical range of the hypotenuse of any point and described right-angle triangle on working edge; L
BCLength for the horizontal direction square edge of described right-angle triangle;
α is profile of tooth and the horizontal angle of work tooth.
Be divided into heating zone and soaking zone in described heating-furnace, every section is respectively four zones; In described heating-furnace, overall length is 15500mm, and width is 31500mm; Wherein, the heating zone total length is 6500mm, and heating zone first paragraph zone length is that 1400mm, heating zone second segment zone length are that 1800mm, the 3rd section zone length of heating zone are that 2000mm, the 4th section zone length of heating zone are 1300mm; The soaking zone total length is 9000mm, and soaking zone first paragraph zone length is that 2600mm, soaking zone second segment zone length are that 2300mm, the 3rd section zone length of soaking zone are that 2100mm, the 4th section zone length of soaking zone are 2000mm; Be respectively arranged with two Sweet natural gas high combustion rate burners in each zone of heating zone, each burner ability is 4.56 * 10
5KJ/h; 2 Sweet natural gas high combustion rate burner burner numbers are set respectively, burner ability 1.53 * 10 in each zone of soaking zone
5KJ/h; Walking beam has 18 groups, and two work teeth are arranged on every group of walking beam, has 36 work teeth on all walking beams; 37 work teeth are arranged on fixed beam, and walking beam and fixed beam amount to 73 work teeth, and the pitch of the tooth of working on described walking beam and fixed beam is 260mm.
Walk the wire at the above 340mm of furnace bottom.
Compared with prior art, the invention has the beneficial effects as follows:
1, work on the walking beam of process furnace of the present invention and the fixed beam working edge of tooth is profile of tooth with index curve, not only be suitable for the uniformly-spaced placement of sleeve pipe, and, make the longest rolling distance of sleeve pipe when the working edge of walking beam and fixed beam tooth rolls be less than or equal to the length of working edge, cause sleeve pipe not stop at the bottom of tooth, heat more even, can avoid producing histological difference and external diameter the distortion, avoid sleeve pipe flexural deformation in stove, improved quality product.Simultaneously, require in the situation that satisfy quality product, be conducive to reduce the control accuracy requirement, thereby improve the qualification rate of product.And, can reduce the quantity of burner, save energy.
2, process furnace of the present invention is divided into heating and two sections of soaking, and every section is divided into four zones, and segmentation is controlled and added heat and temperature, can reduce the heat that adds of burner at soaking zone, and compared with prior art, the every burner of heating zone has fallen 0.47 * 10
5KJ/h; The every burner of soaking zone has fallen 0.07 * 10
5KJ/h utilizes the heat of heating zone to carry out soaking, can save energy.
3, in process furnace of the present invention, the pitch of work tooth is placed on sleeve pipe on the working face of fixed beam work tooth when walking beam descends greater than its horizontal throw, thereby makes the pipe angle of rolling forward; Simultaneously, when walking beam rises, the work tooth top of walking beam plays sleeve pipe, the sleeve pipe angle of rolling forward on the working face of walking beam work tooth, due to the face length of the tooth maximum rolling distance greater than (or equaling) sleeve pipe, can avoid sleeve pipe to stop at the bottom of tooth, heat more even, avoid producing the distortion of histological difference and external diameter, improved quality product.
4, in process furnace of the present invention, walking the wire at the above 340mm of furnace bottom of stove inner sleeve can be flowed around oil pipes furnace gas, forms good circulation, promotes hot homogeneous heating.
Description of drawings
Figure 1 shows that the present invention is used for the profile of tooth schematic diagram of heat treated walking beam furnace;
Figure 2 shows that the schematic diagram of sleeve pipe force analysis on the working face of work tooth.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
of the present inventionly comprise fixed beam and walking beam for heat treated walking beam furnace, be respectively arranged with a plurality of work teeth on described fixed beam and walking beam, the profile of tooth schematic diagram as shown in Figure 1, the vertical line DB that the tooth top D of each described work tooth of process is ordered, the sea line BC of order through C at the bottom of the tooth of identical work tooth and connect the tooth top of this work tooth and the composition of the straight line DC at the bottom of tooth right-angle triangle DBC, described in described right-angle triangle DBC, the angle ∠ BDC at tooth top place is 78 °, described in described right-angle triangle at the bottom of tooth the angle ∠ DCB at place be 12 °, the line (seeing dotted line) that at the bottom of the tooth top D point of described work tooth and tooth, C is ordered is hypotenuse, to be the D point be connected solid line with C is ordered to the working edge of tooth, the face at described working edge place is as working face.Described working edge is the profile of tooth with index curve, and the starting point of described index curve is the tooth top D point of work tooth, and terminal point is C point at the bottom of the tooth of work tooth, and the pitch of described work tooth is greater than the horizontal throw of walking beam.Described index curve is
On working edge, the vertical range of the square edge BC of any point P and right-angle triangle is
In formula:
S is that on working edge, any point P vertical direction extends to the distance that arrives the vertical line DB of ordering through tooth top D with the intersection point P' of hypotenuse, the i.e. length of P'A;
B is the vertical range of the hypotenuse of any point P and right-angle triangle on working edge, the i.e. length of P'P.
L
BCLength for the horizontal direction square edge BC of right-angle triangle.
α is profile of tooth and the horizontal angle (in computation process, unit is radian) of work tooth.
Be divided into heating zone and soaking zone in described heating-furnace, every section is respectively four zones; In described heating-furnace, overall length is 15500mm, and width is 31500mm; Wherein, the heating zone total length is 6500mm, and heating zone first paragraph zone length is that 1400mm, heating zone second segment zone length are that 1800mm, the 3rd section zone length of heating zone are that 2000mm, the 4th section zone length of heating zone are 1300mm; The soaking zone total length is 9000mm, and soaking zone first paragraph zone length is that 2600mm, soaking zone second segment zone length are that 2300mm, the 3rd section zone length of soaking zone are that 2100mm, the 4th section zone length of soaking zone are 2000mm; Be respectively arranged with two Sweet natural gas high combustion rate burners in each zone of heating zone, each burner ability is 4.56 * 10
5KJ/h; 2 Sweet natural gas high combustion rate burner burner numbers are set respectively, burner ability 1.53 * 10 in each zone of soaking zone
5KJ/h; Walking beam has 18 groups, and two work teeth are arranged on every group of walking beam, has 36 work teeth on all walking beams; 37 work teeth are arranged on fixed beam, and walking beam and fixed beam amount to 73 work teeth, and the pitch of the tooth of working on described walking beam and fixed beam is 260mm.
Walk the wire at the above 340mm of furnace bottom.
Fig. 2 is the schematic diagram of sleeve pipe force analysis on the working face of work tooth.
When sleeve pipe rolls, want to make sleeve pipe to begin to roll and do not slide from static, following condition must be arranged:
mg·sinα≤f·mg·cosα
That is, f 〉=tg α
In formula, mg is the unit cross section quality of sleeve pipe, and m represents quality, and g represents universal gravity constant;
F is the frictional coefficient between the working face of the upper work of sleeve pipe and walking beam (or fixed beam) tooth;
α is profile of tooth and the horizontal angle (in computation process, unit is radian) of fixed beam (or walking beam).
Angle [alpha] equals the vertical range h of the square edge BC of any point P and right-angle triangle on working edge
PThe adjust the distance derivative of s, namely
The pitch of the upper work of walking beam (or fixed beam) tooth is all 260mm.Therefore, 0≤s≤260mm, when s=260mm, α can obtain maximum value, and this moment, α was approximately equal to 12 °.Therefore, in the whole rolling scope of sleeve pipe, tg α≤0.213; And f is the frictional coefficient between the working face of the upper work of sleeve pipe and walking beam (or fixed beam) tooth, and because sleeve surface is comparatively coarse, its value is all more than 0.3.Therefore, can guarantee that by tooth Shape Design of the present invention sleeve pipe only cannot not roll slidingly on the working face of work tooth of the present invention.
As shown in Figure 2, sleeve pipe rolls forward under the effect of self gravitation on the working face of walking beam or fixed beam work tooth, when sleeve pipe only rolls and when not sliding, shown in specifically being calculated as follows:
Moment sum to the point of contact of sleeve pipe and tooth is zero,
∑ M (F)=0 is mgsin α R-M=maR (1)
Power sum along the y axle is zero, and ∑ y=0 is F
N-mgcos α=0 (2)
Moment of rolling friction M is, M=δ F
N(3)
By formula (2) and formula (3) as can be known:
M＝δ·F
N＝δ·mg·cosα （4）
Draw by formula (1) and formula (4) Acceleration Formula that sleeve pipe moves along x axle negative direction:
a＝g·sinα-δ·g·cosα/R （5）
By acceleration, the double integrator of time being obtained the distance that sleeve pipe rolls is:
s
1＝∫∫(g·sinα-δ·g·cosα/R)dt （6）
In formula, R is the radius (external diameter) of sleeve pipe;
δ is the coefficient of rolling friction of sleeve pipe and work tooth;
M represents the moment of friction that sleeve pipe rolls.
Sleeve pipe inside heating furnace length is 15500mm, and walking beam has 18 groups, and every group has two teeth, have 36 teeth; Fixed beam has 37 teeth, adds up to 73 teeth.Therefore, the move horizontally stroke of sleeve pipe on every work tooth is:
Distance (being the length of the working edge) L that allows sleeve pipe to roll on the working face of work tooth
1For
And the casing diameter scope of step heating-furnace heating is 132～175mm.
S in the distance that sleeve pipe rolls is calculated
1=∫ ∫ (dt of gsin α-δ gcos α/R), α changes between 0rad～0.1rad, and universal gravity constant is constant.When the coefficient of rolling friction δ of the diameter R maximum of sleeve pipe and sleeve pipe and work tooth hour, the distance that sleeve pipe rolls is the longest.
Therefore, getting casing diameter is the maximum diameter 175mm that process furnace allows, and the coefficient of rolling friction of getting sleeve pipe and work tooth is the minimum coefficient δ=0.117 in the least favorable situation.
:
s
1＝∫∫(g·sinα-δ·g·cosα/R)dt＝209.8mm
In formula, R is the radius of sleeve pipe, R=175/2=87.5mm;
δ is the coefficient of rolling friction of sleeve pipe and work tooth, δ=0.117;
By above-mentioned calculating as seen, in worst situation, the rolling distance of sleeve pipe on working face is less than the length L of working edge
1Therefore, can guarantee that body under any circumstance can not be rolled into tooth at the bottom of.
In sum, by tooth Shape Design of the present invention, can ensure that sleeve pipe only cannot not roll slidingly on the working face of work tooth, and, at the bottom of being rolled to tooth in no instance, thereby ensure the homogeneity that heats.
Embodiment 1:
Below describe take petroleum casing pipe as embodiment.
The composition of material is as shown in table 1.
Table 1
Process furnace is divided into heating and two confession hot arcs of soaking along the furnace superintendent direction, each section is divided into again four zones and burns and temperature control on the furnace superintendent direction, stove adopts the speed end burner to heat, in 2 Sweet natural gas high combustion rate burner burner numbers of each region division of heating zone, burner ability 4.56 * 10
5KJ/h, every district heating amount 9.12 * 10
5KJ/h; In 2 Sweet natural gas high combustion rate burner burner numbers of each region division of soaking zone, burner ability 1.53 * 10
5KJ/h, every district heating amount 3.06 * 10
5KJ/h.In the first area stove of heating zone temperature head be no more than ± 20 ℃, second area stove in temperature head be no more than ± 18 ℃, the 3rd zone furnace in temperature head be no more than ± 16 ℃, the 4th zone furnace in temperature head be no more than ± 14 ℃; In the first area stove of soaking zone temperature head be no more than ± 12 ℃, second area stove in temperature head be no more than ± 10 ℃, the 3rd zone furnace in temperature head be no more than ± 9 ℃, the 4th zone furnace in temperature head be no more than ± 8 ℃ of temperature heads.In the strictest stove temperature head require to be no more than ± 8 ℃.Walking beam has 18 groups, and two work teeth are arranged on every group of walking beam, has 36 work teeth on all walking beams; 37 work teeth are arranged on fixed beam, and walking beam and fixed beam amount to 73 work teeth, and the pitch of the tooth of working on described walking beam and fixed beam is 260mm.
The steel pipe of external diameter 139.7mm * wall thickness 7.72mm * length 3000mm is heat-treated by the condition shown in table 2, mechanical property and the ovality of statistics steel pipe, its distribution sees Table 2.And the Ac1 temperature of material, Ac2 temperature are calculated by following formula (6) and formula (7):
Ac1＝723-10.7Mn%-16.9Ni%+29.1Si%+16.9Cr% （7）
Ac3＝910-203(C%)
0.5-15.2Ni%+44.7Si%+104V%-30.0Mn% （8）
-11.0Cr%-20.0Cu%+700P%
The Ac of 27MnCrV steel
1=736 ℃, Ac
3=810 ℃, getting quenching temperature is 840～860 ℃, and the heat tracing time is 20min; Tempering temperature is 630 ℃, tempering heat tracing time 50min.
The cycle of operation of process furnace walking beam was determined by tempering heat tracing time of oil pipes: the tempering heat tracing time equals the cycle of operation that the number of teeth of walking beam multiply by walking beam.
Therefore, the cycle of operation of walking beam is 83 seconds.
Oil pipes is on the working face of work tooth, and the distance of rolling forward is as follows:
s
1＝∫∫(g·sinα-δ·g·cosα/R)dt＝198.7mm
In formula, R is the radius of oil pipes, R=139.7/2mm;
δ is the coefficient of rolling friction of oil pipes and work tooth, δ=0.12;
Can find out from above-mentioned calculating, oil pipes roll apart from s
1Length L less than work tooth working edge
1, therefore, at the bottom of the tooth tooth that can not roll.
The quenching temperature 780-830 of 37Mn5 steel ℃, 15min heat-up time that quenches, speed of cooling 40-50 ℃/s; 600-650 ℃ of tempering Heating temperature, tempering insulation time time 50-60min.
The cycle of operation of process furnace walking beam was determined by the tempering heat tracing time of oil pipes:
The cycle of operation of walking beam is 91 seconds
Oil pipes is on the inclined-plane of tooth, and the distance of rolling forward is as follows:
s
1＝∫∫(g·sinα-δ·g·cosα/R)dt＝201.9mm
In formula, R is the external diameter of oil pipes, R=139.7mm;
δ is the coefficient of rolling friction of oil pipes and work tooth, δ=0.12;
Can find out from above-mentioned calculating, oil pipes roll apart from s
1Less than the permission rolling distance L on work tooth inclined-plane
1, at the bottom of the tooth tooth that can not roll.
Table 2
As can be seen from Table 2, heat-treat by process furnace of the present invention, in the strictest stove temperature head require to be no more than ± 8 ℃, than now generally desired ± 5 a ℃ temperature head obviously reduce, reduced the control accuracy requirement.The mechanical performance index such as tensile strength, yield strength and ballistic work of heat-treating resulting oil pipes by process furnace of the present invention satisfy the quality standard of API, and the ovality index of geometric accuracy is all in standard range.
In sum, when heat-treating by process furnace of the present invention, the longest rolling distance of sleeve pipe when the working edge of walking beam and fixed beam work tooth rolls is less than or equal to the length of working edge, cause sleeve pipe not stop at the bottom of tooth, heat more even, can avoid producing the distortion of histological difference and external diameter, avoid sleeve pipe flexural deformation in stove, improve quality product.Simultaneously, require in the situation that satisfy quality product, be conducive to reduce the control accuracy requirement, thereby improve the qualification rate of product.
The above is only the preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. one kind is used for heat treated walking beam furnace, comprise fixed beam and walking beam, be respectively arranged with a plurality of work teeth on described fixed beam and walking beam, it is characterized in that, the vertical line of the tooth top of each described work tooth of process, through the sea line at the bottom of the tooth of identical work tooth and connect the tooth top of this work tooth and the rectilinear(-al) right-angle triangle at the bottom of tooth, the angle at tooth top place described in described right-angle triangle is 78 °, described in described right-angle triangle at the bottom of tooth the angle at place be 12 °, at the bottom of the tooth top of described work tooth and tooth, line is working edge, the face at described working edge place is as working face, described working edge is the profile of tooth with index curve, the pitch of described work tooth is greater than the horizontal throw of walking beam, the starting point of described index curve is the tooth top of work tooth, at the bottom of terminal point is the tooth of work tooth, described index curve is
On working edge, the vertical range of the horizontal direction square edge of any point and described right-angle triangle is
In formula: s is that on working edge, any point vertical direction extends to the intersection point of the hypotenuse of described right-angle triangle to the distance through the vertical line of tooth top;
B is the vertical range of the hypotenuse of any point and described right-angle triangle on working edge;
L
BCLength for the horizontal direction square edge of described right-angle triangle;
α is profile of tooth and the horizontal angle of work tooth.
2. according to claim 1ly it is characterized in that for heat treated walking beam furnace, be divided into heating zone and soaking zone in described heating-furnace, every section is respectively four zones; In described heating-furnace, overall length is 15500mm, and width is 31500mm; Wherein, the heating zone total length is 6500mm, and heating zone first paragraph zone length is that 1400mm, heating zone second segment zone length are that 1800mm, the 3rd section zone length of heating zone are that 2000mm, the 4th section zone length of heating zone are 1300mm; The soaking zone total length is 9000mm, and soaking zone first paragraph zone length is that 2600mm, soaking zone second segment zone length are that 2300mm, the 3rd section zone length of soaking zone are that 2100mm, the 4th section zone length of soaking zone are 2000mm; Be respectively arranged with two Sweet natural gas high combustion rate burners in each zone of heating zone, each burner ability is 4.56 * 10
5KJ/h; 2 Sweet natural gas high combustion rate burner burner numbers are set respectively, burner ability 1.53 * 10 in each zone of soaking zone
5KJ/h; Walking beam has 18 groups, and two work teeth are arranged on every group of walking beam, has 36 work teeth on all walking beams; 37 work teeth are arranged on fixed beam, and walking beam and fixed beam amount to 73 work teeth, and the pitch of the tooth of working on described walking beam and fixed beam is 260mm.
3. according to claim 2ly it is characterized in that for heat treated walking beam furnace, walk the wire at the above 340mm of furnace bottom.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310097099.7A CN103131836B (en) | 2013-03-25 | 2013-03-25 | Stepping type heating furnace for heat treatment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105063339A (en) * | 2015-07-07 | 2015-11-18 | 北京首钢国际工程技术有限公司 | Stepping beam type heating furnace capable of heating both round billet and square billet and use method |
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| CN102489515A (en) * | 2011-12-26 | 2012-06-13 | 陈殿华 | Manufacturing process method for seamless steel tube |
| CN203212606U (en) * | 2013-03-25 | 2013-09-25 | 天津商业大学 | Stepping type heating furnace for heat treatment |
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| CN105063339A (en) * | 2015-07-07 | 2015-11-18 | 北京首钢国际工程技术有限公司 | Stepping beam type heating furnace capable of heating both round billet and square billet and use method |
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