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Anchor rod reinforcing steel bar in 400-MPa level and production method thereof

A production method and steel bar technology, applied in the direction of metal rolling, etc., can solve the problems of base circle size and deviation, transverse rib size requirement and transverse rib spacing, etc.

Active Publication Date: 2014-08-20
XINJIANG BAYI IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Literature search Domestic production of 400MPa grade anchor bars is in accordance with the production requirements of HRB400, and the strength requirements must be met by adding noble alloys such as V, Nb, Ti or controlled cooling after rolling; No longitudinal ribs are specified in MT146.2-2011 (HRB400 has longitudinal ribs, generally opposite to the direction of the transverse ribs on both sides), but there are no provisions on the size and deviation of the base circle, the size requirements of the transverse ribs, and the spacing of the transverse ribs

Method used

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  • Anchor rod reinforcing steel bar in 400-MPa level and production method thereof
  • Anchor rod reinforcing steel bar in 400-MPa level and production method thereof
  • Anchor rod reinforcing steel bar in 400-MPa level and production method thereof

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Embodiment

[0032] 1. Design reasonable process control parameters and compare with HRB400, see Table 1 and 2.

[0033] 1) Composition is designed by mass percentage:

[0034] Table 1 Ingredient Requirements%

[0035]

[0036] According to the data in the above table: (1) The carbon content of the 400MPa anchor bar is higher than the requirement of HRB400; (2) Adding V and lowering does not require controlled cold rolling. If HRB400 does not add V, Nb, Ti or controlled cold rolling, the strength cannot be achieved. fulfil requirements.

[0037] 2) Appearance size design

[0038] Crescent ribs are used, the angle α between the side of the transverse rib and the surface of the steel bar is designed to be 51°, and the angle β between the transverse rib and the axis of the steel bar is designed to be 55°. The shape is shown in figure 2 , size and allowable deviation, see Table 2.

[0039] Table 2 Dimensions and allowable deviation

[0040]

[0041] According to the data in the abo...

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Abstract

The invention provides an anchor rod reinforcing steel bar in the 400-MPa level and a production method thereof. The innovated anchor rod reinforcing steel bar in the 400-MPa level is made based on an MT146.2-2011 regulated left left-handed longitudinal-rib-free twisted reinforcing steel bar. No welding or bending is needed in the follow-up using process of the left-handed anchor rod reinforcing steel bar in the 400-MPa level, so that the HRB400 requirements can be broken through in component design, the reinforcing role of C is brought into full play, and the use amount of alloys, particularly V, Nb, Ti and other valuable alloys is reduced on the basis of HRB400; the conventional hot rolling technology is adopted, controlled cooling is not needed, meanwhile, the influences of the size factor on the strength are considered, and the left-handed longitudinal-rib-free twisted reinforcing steel bar in the 400-MPa level meets the performance requirement with the lower cost.

Description

technical field [0001] The invention relates to the production of anchor rod steel bars. The technical parameters of the designed and produced anchor rod steel bars all meet the quality requirements of the metal rod body of the resin anchor rod used for shaft support. Background technique [0002] In the second part of MT146.2-2011 resin anchor rod, it is stipulated that three shapes of metal rod body of resin anchor rod are defined in the metal rod body and its accessories. The tensile strength and yield strength of steel bars shall comply with the provisions of GB1499.2, and the elongation after breaking shall not be less than 15%. Because the head of the steel bar needs to be threaded when making the bolt, if the base circle size of the steel bar is small, the thread profile cannot be guaranteed during processing, which will affect the safety of the bolt. With the advancement of technology and the safety requirements of mine shaft support In the production of 400MPa grad...

Claims

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Application Information

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IPC IPC(8): B21B1/16C22C38/12
Inventor 陈海军宋维兆雷洪张海军李玲
Owner XINJIANG BAYI IRON & STEEL
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