CN205816412U - The pass of complete thread reinforcing steel bar - Google Patents
The pass of complete thread reinforcing steel bar Download PDFInfo
- Publication number
- CN205816412U CN205816412U CN201620479493.6U CN201620479493U CN205816412U CN 205816412 U CN205816412 U CN 205816412U CN 201620479493 U CN201620479493 U CN 201620479493U CN 205816412 U CN205816412 U CN 205816412U
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- Prior art keywords
- pass
- bottom land
- steel bar
- reinforcing steel
- leader
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Abstract
This utility model provides the pass of a kind of complete thread reinforcing steel bar, described pass includes leader pass type and last groove, wherein: described leader pass type is surrounded by bottom land under bottom land in leader pass type and leader pass type and forms, the two ends of bottom land non-pass envelope curve before being all connected with finished product in described leader pass type, the two ends of bottom land non-pass envelope curve before being all connected with finished product under described leader pass type；Described last groove is surrounded by bottom land under bottom land on last groove and last groove and forms, and on described last groove, the two ends of bottom land are all connected with finished product non-pass envelope curve；Under described last groove, the two ends of bottom land are all connected with finished product non-pass envelope curve.The pass of the complete thread reinforcing steel bar that this utility model provides, eliminates the bulging line problem in the finished product free wxpansion face of complete thread reinforcing steel bar, reaches the requirement of high dimensional accuracy.
Description
Technical field
This utility model relates to complete thread reinforcing steel bar finished size stability contorting field, particularly to a kind of complete thread reinforcing steel bar
Pass.
Background technology
Complete thread reinforcing steel bar is the straight steel bar of the externally threaded high dimensional accuracy of rolled with on whole reinforcing bar.This reinforcing bar is arbitrarily
The section female adapter of band of all can screwing on is attached or threaded nut of screwing on anchors.Due to anchoring letter
Just, safe and reliable, the advantage such as easy construction is widely used in the industries such as hydraulic engineering, railway, bridge and coal supporting.
In process of production, the face of spreading is in free state to complete thread reinforcing steel bar, is the primary direction of metal flow, rolled
Any fluctuation of journey metal flow all can make face of spreading there is the risk of drum line.The complete thread reinforcing steel bar bulging line in the face of spreading can affect
Freely screwing in of adapter or nut, brings bigger difficulty to construction.In the production process of complete thread reinforcing steel bar latter two
Before crucial passage/stage is finished product and two stages of finished product, the two stage correspondence pass is leader pass type and last groove.
Leader pass type mostly uses flat box hole at present, and finished product uses low-angle (less than 15 °) extended corner, simultaneously for ease of becoming
Aligning of product thread form, uses less roll gap to design.Such synthesis result causes the bulging line in finished product free wxpansion face, to little rule
The impact of lattice complete thread reinforcing steel bar becomes apparent from.
Such as, CN103042029A discloses the cutting and rolling method of a kind of Φ 22mm spiral with ribbing, belongs to steel rolling
Technical field of producing.Technical scheme is: is heated by steel blank, rolls through roughing mills, through intermediate mill after crop
Rolling, then roll through mm finishing mill unit after crop, it is cooled into product after cutting multiple length；Steel material carries out the most flat through mm finishing mill unit
Roller, one box hole preform, pre-cutting together, is cut into two lines, and the 6th passage of mm finishing mill unit uses plain-barreled roll, and finishing mill is pre-
Forming steel material is rectangular billet, and the dicing process of steel material is finally that the Cutting guide by milling train outlet completes, by Cutting guide
Complete cutting.But the milling method that CN103042029A disclosure is spiral with ribbing, its method is not particularly suited for
Complete thread reinforcing steel bar, because spiral with ribbing is with or without longitudinal rib (drum line), and can not there is bulging line situation in complete thread reinforcing steel bar.
It is both needed to meet connection request at the arbitrary section of complete thread reinforcing steel bar, in addition to the basic demand to screw thread rib, to freedom
The dimensional requirement of expanding noodles is the highest, the situation of the free wxpansion face drum line occurred in actual production so that complete thread reinforcing steel bar
Finished product does not meets standard-required, causes resources loss, and the control of free wxpansion face drum line is all being groped to eliminate by the most each manufacturing enterprise
Method processed.
Utility model content
The purpose of this utility model is to provide the pass of a kind of complete thread reinforcing steel bar, it is possible to eliminate the finished product of complete thread reinforcing steel bar
The bulging line problem in free wxpansion face.
To achieve these goals, the following technical scheme of this utility model offer:
The pass of a kind of complete thread reinforcing steel bar, described pass includes leader pass type and last groove, wherein: before described finished product
Pass is surrounded by bottom land under bottom land in leader pass type and leader pass type and forms, and in described leader pass type, the two ends of bottom land are equal
Connect non-pass envelope curve before finished product, the two ends of bottom land non-pass envelope curve before being all connected with finished product under described leader pass type；Described one-tenth
Sample wells type is surrounded by bottom land under bottom land on last groove and last groove and forms, and on described last groove, the two ends of bottom land are all connected with
Finished product non-pass envelope curve；Under described last groove, the two ends of bottom land are all connected with finished product non-pass envelope curve.
Further, in the pass of above-mentioned complete thread reinforcing steel bar, in described leader pass type bottom land by the first circular arc,
Two circular arcs and three-arc are connected in sequence, and the center of circle of described first circular arc and described three-arc is in described leader pass type
Inside, the center of circle of described second circular arc is in the outside of described leader pass type.
Further, in the pass of above-mentioned complete thread reinforcing steel bar, under described leader pass type bottom land by the first circular arc,
Two circular arcs and three-arc are connected in sequence, and the center of circle of described first circular arc and described three-arc is in described leader pass type
Inside, the center of circle of described second circular arc is in the outside of described leader pass type.
Further, in the pass of above-mentioned complete thread reinforcing steel bar, the radius of described second circular arc is more than described first circle
Arc and the radius of described three-arc.
Further, in the pass of above-mentioned complete thread reinforcing steel bar, tangent with the end of bottom land in described leader pass type
Tangent line and the vertical straight line of pass envelope curve non-with before described finished product between angle be leader pass type extended corner.
Further, in the pass of above-mentioned complete thread reinforcing steel bar, the number of degrees of described leader pass type extended corner be 32 °～
36°。
Further, in the pass of above-mentioned complete thread reinforcing steel bar, tangent with the end of bottom land on described last groove
Angle between tangent line and the vertical straight line of pass envelope curve non-with described finished product is finished product type extended corner.
Further, in the pass of above-mentioned complete thread reinforcing steel bar, the number of degrees of described last groove extended corner be 18 °～
22°。
Further, in the pass of above-mentioned complete thread reinforcing steel bar, hole non-with finished product respectively, the two ends of described last groove
The junction of type envelope curve is respectively formed free wxpansion district, and the position in the corresponding described free wxpansion district of described complete thread reinforcing steel bar is the most swollen
Swollen, described free wxpansion is towards the central concave of described complete thread reinforcing steel bar.
Further, in the pass of above-mentioned complete thread reinforcing steel bar, described free wxpansion face is to described complete thread reinforcing steel bar
The arc-shaped of central concave.
Analyzing and understand, this utility model discloses the pass of a kind of complete thread reinforcing steel bar, and this pass is broken the normal procedure thread finish hole
The little extended corner of type and the flat design of leader pass type, last groove uses bigger extended corner, and leader pass type uses combination
Hole type design at the bottom of arc, the two has combined the control to rolling material type, has eliminated the finished product free wxpansion face of complete thread reinforcing steel bar
Drum line problem, reaches the requirement of high dimensional accuracy.
Accompanying drawing explanation
The Figure of description of the part constituting the application is used for providing being further appreciated by of the present utility model, this practicality
Novel schematic description and description is used for explaining this utility model, is not intended that improper restriction of the present utility model.
Wherein:
The leader pass type schematic diagram of Fig. 1 this utility model one embodiment；
The last groove schematic diagram of Fig. 2 this utility model one embodiment；
The end view in kind of the complete thread reinforcing steel bar that Fig. 3 this utility model one embodiment obtains.
Description of reference numerals: 1 leader pass type；Bottom land in 11 leader pass types；115 first circular arcs；116 second circular arcs；
117 three-arcs；Bottom land under 12 leader pass types；Non-pass envelope curve before 13 finished products；14 leader pass type extended corners；125 first
Circular arc；126 second circular arcs；127 three-arcs；2 last grooves；Bottom land on 21 last grooves；Bottom land under 22 last grooves；23 one-tenth
Product non-pass envelope curve；24 last groove extended corners；25 free wxpansion districts；3 complete thread reinforcing steel bars (end face in kind)；31 reinforcing bar bases
Circle；32 screw thread ribs；33 free wxpansion faces.
Detailed description of the invention
Describe this utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.It should be noted that do not conflicting
In the case of, the embodiment in the application and the feature in embodiment can be mutually combined.
In description of the present utility model, term " longitudinally ", " laterally ", " on ", D score, "front", "rear", "left", "right",
Orientation or the position relationship of the instruction such as " vertically ", " level ", " top ", " end " are based on orientation shown in the drawings or position relationship,
It is for only for ease of description this utility model rather than requires that this utility model must be with specific azimuth configuration and operation, therefore
It is not intended that to restriction of the present utility model.The term used in this utility model " is connected ", " connection " should be interpreted broadly,
Connect for example, it may be fixing, it is also possible to be to removably connect；Can be to be joined directly together, it is also possible to indirect by intermediate member
It is connected, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
The leader pass type schematic diagram of Fig. 1 this utility model one embodiment；The finished hole of Fig. 2 this utility model one embodiment
Type schematic diagram, what in Fig. 2, that circle of outside was expressed is the carved cross rib of pass (groove becomes screw thread during rolling) outer profile；
The end view in kind of the complete thread reinforcing steel bar that Fig. 3 this utility model one embodiment obtains.
As shown in Figure 1 to Figure 3, according to embodiment of the present utility model, it is provided that the pass of a kind of complete thread reinforcing steel bar, pass
Including leader pass type 1 and last groove 2, wherein: leader pass type 1 is by under bottom land 11 in leader pass type and leader pass type
Bottom land 12 surrounds and forms, and the two ends of bottom land 11 non-pass envelope curve 13 before being all connected with finished product in leader pass type, under leader pass type
The two ends of bottom land 12 are non-pass envelope curve 13 before being all connected with finished product；Non-pass bag before the finished product on the left side of bottom land 11 in leader pass type
It is non-pass envelope curve restriction before finished product between non-pass envelope curve 13 before the finished product on the left side of bottom land 12 under line 13 and leader pass type
Region, in like manner, non-pass envelope curve 13 and bottom land 12 under leader pass type before the finished product on the right of bottom land 11 in leader pass type
Also it is non-pass envelope curve restricted area, the i.e. left side of pass 1 before finished product before finished product between non-pass envelope curve 13 before the finished product on the right
Non-pass envelope curve restricted area before being finished product with the right, non-before two finished products up and down of non-pass envelope curve restricted area before finished product
Pass envelope curve 13 is parallel.
Last groove 2 is surrounded by bottom land 22 under bottom land on last groove 21 and last groove and forms, bottom land on last groove
The two ends of 21 are all connected with finished product non-pass envelope curve 23；Under last groove, the two ends of bottom land 22 are all connected with finished product non-pass envelope curve 23.
The finished product on the left side of bottom land 21 non-pass envelope curve 23 and the non-pass of finished product on the left side of bottom land 22 under last groove on last groove
It is finished product non-pass envelope curve restricted area between envelope curve 23, in like manner, the finished product on the right of bottom land 21 non-pass bag on last groove
Also it is finished product non-pass envelope curve restricted area between the finished product on the right of bottom land 22 non-pass envelope curve 23 under line 23 and last groove,
The i.e. left side and the right of last groove 1 is finished product non-pass envelope curve restricted area, finished product non-pass envelope curve restricted area upper
Lower two finished product non-pass envelope curves 23 are parallel.
Preferably, in leader pass type, bottom land 11 is connected successively by first circular arc the 115, second circular arc 116 and three-arc 117
Connecing and form, the center of circle of the first circular arc 115 and three-arc 117 is in the inside of leader pass type 1, and the center of circle of the second circular arc 116 exists
The outside of leader pass type 1；Under leader pass type, bottom land 12 is depended on by first circular arc the 125, second circular arc 126 and three-arc 127
Secondary being formed by connecting, the center of circle of the first circular arc 125 and three-arc 127 is in the inside of leader pass type 1, for being more beneficial for metal
Uniform Flow, is preferably set to equal by the radius of the first circular arc 125 and three-arc 127；The center of circle of the second circular arc 126 is becoming
The outside of pass 1 before product.In leader pass type, under bottom land 11 and leader pass type, bottom land 12 is symmetrical arranged.
Preferably, first circular arc the 115, second circular arc 116 of bottom land 11, three-arc 117 in leader pass type, above-mentioned respectively
It is tangent connection between section circular arc, first circular arc the 125, second circular arc of bottom land 12, three-arc 127 under leader pass type, on
Stating between each section of circular arc is tangent connection.Between each section of circular arc, the tangent material type formed that connects smooths regular；Connect if intersected
Wedge angle can be formed in junction, material type be caused deleterious effect, is easily formed finished surface defect.
The tangent line tangent with the end of bottom land 11 in leader pass type and the vertical straight line of pass envelope curve 13 non-with before finished product
Between angle be leader pass type extended corner 14, the tangent line of non-pass envelope curve 13 point of intersection before the i.e. first circular arc 115 and finished product
And the angle between vertical straight line is leader pass type extended corner 14.Coordinate the arc of bottom land 11 in different leader pass types
Degree, the number of degrees of leader pass type extended corner 14 can float between 32 °～36 °, such as, 33 °, 34 °, 35 °, most preferably
35°。
Between the tangent line tangent with the end of bottom land on last groove 21 and the vertical straight line of pass envelope curve 23 non-with finished product
Angle be finished product type extended corner 24, i.e. on last groove the tangent line of bottom land 21 and finished product non-pass envelope curve 23 point of intersection with vertically
Straight line between angle be last groove extended corner 24.The number of degrees of last groove extended corner 24 can float between 18 °～22 °
Dynamic, such as, 19 °, 20 °, 21 °, most preferably 20 °.
The junction of the two ends of last groove 2 pass envelope curve 23 non-with finished product respectively is respectively formed free wxpansion district 25,
The left end of sample wells type 2 forms a free wxpansion district 25, the i.e. right-hand member of last groove 2 with the junction of finished product non-pass envelope curve 23
The junction of pass envelope curve 23 non-with finished product forms another free wxpansion district 25.As it is shown on figure 3, complete thread reinforcing steel bar 3 includes steel
Muscle basic circle 31 and screw thread rib 32, the position in the free wxpansion district 25 of the corresponding last groove 2 of complete thread reinforcing steel bar 3 is free wxpansion face
33, free wxpansion face 33 is the central concave to complete thread reinforcing steel bar 3 to the central concave of complete thread reinforcing steel bar 3, free wxpansion face 33
Arc-shaped.
The little extended corner of normal thread last groove and the flat-bottom design of leader pass type are broken, disclosed in this utility model
The pass of complete thread reinforcing steel bar, last groove 2 uses bigger extended corner, leader pass type 1 to use combination design at the bottom of arc, the two
Combine the control to rolling material type, eliminate the finished product free wxpansion face 33 (or referred to as unrestricted spread face) of complete thread reinforcing steel bar
Drum line problem, reaches the requirement of high dimensional accuracy.
In conjunction with Fig. 1 and Fig. 2, as a example by the pass that nominal diameter is 25mm specification is given below:
For eliminating the bulging line problem in finished product free wxpansion face 33 of complete thread reinforcing steel bar 3, hole type design it is crucial that
1, it is to reach the ideal form that finished product free wxpansion face 33 appropriateness of complete thread reinforcing steel bar 3 caves in, according to metal flow
Rule preset the bottom land (see Fig. 1) of band convex arc degree in leader pass type 1, be the full effect reaching finished product rib simultaneously, finished product
Under on front pass, bottom land 11 is arranged to double radian that is first circular arc 115 and three-arc 117, leader pass type, bottom land 12 is arranged to
Double radians that is first circular arc 125 and three-arc 127, the optimal combination of double radians caves in promoting finished product free wxpansion face 33
The formation of shape；And use the leader pass type extended corner 14 of 35 ° in order to allow material type have a full regular shape
Shape, prepares for last groove 2 condiments type.
In leader pass type bottom land 11 the first circular arc 115 and under three-arc 117, leader pass type the first of bottom land 12
The center of circle of circular arc 125 and three-arc 127 in the inside of leader pass type 1, the first circular arc 115 of bottom land 11 in leader pass type
It is 11.7mm with the first circular arc 125 of bottom land 12 under three-arc 117, leader pass type and the radius of three-arc 127.
The center of circle of the second circular arc 126 of bottom land 12 under second circular arc 116 of bottom land 11, leader pass type in leader pass type
On the outside of leader pass type 1, leader pass type under the second circular arc 116 of bottom land 11, leader pass type the second of bottom land 12
The radius of circular arc is 19mm.
The most visible, the radius of the second circular arc 116,126 is more than the first circular arc 115,125 and three-arc 117,127
Radius, is arranged such the second circular arc 116,126 being because in leader pass type 1 and corresponds to the free wxpansion district of last groove 2
25 regions, it is simple to free wxpansion district 25 forms recess, are the most also the needs obtaining certain depth-width ratio.
In leader pass type, the first circular arc 115 of bottom land 11 and the center of circle of three-arc 117 are positioned at the water of leader pass type 1
Below flat centrage, before under leader pass type, the first circular arc 125 of bottom land 12 and the center of circle of three-arc 127 are positioned at finished product
Above the horizontal center line of pass 1.Being arranged such is the depth-width ratio in order to control leader pass type 1, full thread leader pass
It is optimal that type 1 is maintained at the depth-width ratio of 0.55～0.60, and one is contracting material needs, and two are advantageous for improving filling of thread finish rib 32
Full scale.
In leader pass type, the first circular arc 115 of bottom land 11 and the central angle of three-arc 117 correspondence are 70.74 °, finished product
On front pass, the central angle of the second circular arc 116 correspondence of bottom land 11 is 31.48 °；First circular arc of bottom land 12 under leader pass type
115 and the central angle of three-arc 117 correspondence be 70.74 °, the circle of the second circular arc 116 correspondence of bottom land 12 under leader pass type
Heart angle is 31.48 °.
2, last groove 2 uses bigger 20 ° last groove extended corner 24 (see Fig. 2), limited free wxpansion district 25 energy
Absorb more metal redundant as far as possible, cause unnecessary metal to be unlikely to protrude chain of command and cause bulging line；
Two finished product non-pass envelope curves 23 up and down of finished product non-pass envelope curve restricted area be arranged in parallel, and upper and lower two one-tenth
Distance between product non-pass envelope curve 23 is 2mm；
Circular sliding slopes between bottom land 21 and finished product non-pass envelope curve 23 on last groove, connects the radius 1.5mm of circular arc, even
The stress that can eliminate herein that arranges connecing circular arc is concentrated, and optimizes cold-forming property.
Above-mentioned last groove extended corner 24 (20 °) need to coordinate with roll gap, completes the absorption to section redundancy metal,
Less gap values between rollers design is unfavorable for playing a role with this parameter coordination.
The combination of leader pass type 1 and last groove 2 eliminates the free wxpansion face 33 drum line of complete thread reinforcing steel bar 3
Problem.
As can be seen from the above description, this utility model the above embodiments achieve following technique effect:
The finished product free wxpansion face 33 of the complete thread reinforcing steel bar 3 that this pass is produced can form the arc-shaped toward central concave,
In meeting Fig. 3 at free wxpansion 33, relatively big to the tolerance of metal flow fluctuation, permissible before finished product and finished product in process of production
Do not use looper to be adjusted, the face size conformance with standard requirement of complete thread reinforcing steel bar 3 also can be effectively ensured, reduce rolling
Control difficulty, decrease intermediate sizes waste product, improve lumber recovery in kind.
The foregoing is only preferred embodiment of the present utility model, be not limited to this utility model, for this area
Technical staff for, this utility model can have various modifications and variations.It is all within spirit of the present utility model and principle,
Any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (10)
1. the pass of a complete thread reinforcing steel bar, it is characterised in that described pass includes leader pass type and last groove, wherein:
Described leader pass type is surrounded by bottom land under bottom land in leader pass type and leader pass type and forms, described leader pass type
The two ends of upper bottom land are non-pass envelope curve before being all connected with finished product, non-hole before the two ends of bottom land are all connected with finished product under described leader pass type
Type envelope curve；
Described last groove is surrounded by bottom land under bottom land on last groove and last groove and forms, bottom land on described last groove
Two ends are all connected with finished product non-pass envelope curve；Under described last groove, the two ends of bottom land are all connected with finished product non-pass envelope curve.
The pass of complete thread reinforcing steel bar the most according to claim 1, it is characterised in that in described leader pass type, bottom land is by
One circular arc, the second circular arc and three-arc are connected in sequence, and the center of circle of described first circular arc and described three-arc is described
The inside of leader pass type, the center of circle of described second circular arc is in the outside of described leader pass type.
The pass of complete thread reinforcing steel bar the most according to claim 1, it is characterised in that under described leader pass type, bottom land is by
One circular arc, the second circular arc and three-arc are connected in sequence, and the center of circle of described first circular arc and described three-arc is described
The inside of leader pass type, the center of circle of described second circular arc is in the outside of described leader pass type.
4. according to the pass of the complete thread reinforcing steel bar described in Claims 2 or 3, it is characterised in that the radius of described second circular arc is big
In described first circular arc and the radius of described three-arc.
The pass of complete thread reinforcing steel bar the most according to claim 1, it is characterised in that with bottom land in described leader pass type
Angle between tangent line that end is tangent and the vertical straight line of pass envelope curve non-with before described finished product is leader pass type extended corner.
The pass of complete thread reinforcing steel bar the most according to claim 5, it is characterised in that the degree of described leader pass type extended corner
Number is 32 °～36 °.
The pass of complete thread reinforcing steel bar the most according to claim 1, it is characterised in that with the end of bottom land on described last groove
Angle between tangent line that portion is tangent and the vertical straight line of pass envelope curve non-with described finished product is finished product type extended corner.
The pass of complete thread reinforcing steel bar the most according to claim 7, it is characterised in that the number of degrees of described last groove extended corner
It it is 18 °～22 °.
The pass of complete thread reinforcing steel bar the most according to claim 1, it is characterised in that the two ends of described last groove respectively with
The junction of finished product non-pass envelope curve is respectively formed free wxpansion district, the position in the corresponding described free wxpansion district of described complete thread reinforcing steel bar
For free wxpansion face, described free wxpansion is towards the central concave of described complete thread reinforcing steel bar.
The pass of complete thread reinforcing steel bar the most according to claim 9, it is characterised in that described free wxpansion face is to described
The arc-shaped of the central concave of complete thread reinforcing steel bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620479493.6U CN205816412U (en) | 2016-05-24 | 2016-05-24 | The pass of complete thread reinforcing steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620479493.6U CN205816412U (en) | 2016-05-24 | 2016-05-24 | The pass of complete thread reinforcing steel bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205816412U true CN205816412U (en) | 2016-12-21 |
Family
ID=57558890
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620479493.6U Expired - Fee Related CN205816412U (en) | 2016-05-24 | 2016-05-24 | The pass of complete thread reinforcing steel bar |
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| Country | Link |
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| CN (1) | CN205816412U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880294A (en) * | 2016-05-24 | 2016-08-24 | 山东钢铁股份有限公司 | Pass design for full-thread rebar |
| CN107030105A (en) * | 2017-05-10 | 2017-08-11 | 西宁特殊钢股份有限公司 | The milling method of cylindrical shape electroslag ingot with taper |
-
2016
- 2016-05-24 CN CN201620479493.6U patent/CN205816412U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880294A (en) * | 2016-05-24 | 2016-08-24 | 山东钢铁股份有限公司 | Pass design for full-thread rebar |
| CN105880294B (en) * | 2016-05-24 | 2018-02-09 | 山东钢铁股份有限公司 | The hole type design of complete thread reinforcing steel bar |
| CN107030105A (en) * | 2017-05-10 | 2017-08-11 | 西宁特殊钢股份有限公司 | The milling method of cylindrical shape electroslag ingot with taper |
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| CF01 | Termination of patent right due to non-payment of annual fee |