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Production method of steel having 225 MPa stage of low yield point and used for building earthquake resistance

A technology with a low yield point and a manufacturing method, applied in the field of steel production, can solve the problem of high production process cost, and achieve the effects of reducing strength, facilitating coarsening of inclusions and increasing temperature

Active Publication Date: 2014-10-15
SHOUGANG CORPORATION
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  • Abstract
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Problems solved by technology

[0004] The invention provides a manufacturing method of 225MPa level low yield point building anti-seismic steel to solve the technical problem of high cost in the existing steel production process

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  • Production method of steel having 225 MPa stage of low yield point and used for building earthquake resistance
  • Production method of steel having 225 MPa stage of low yield point and used for building earthquake resistance

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Embodiment 1

[0029] The manufacturing method of the 225MPa level low-yield point building anti-seismic steel related to the present invention, the chemical composition of the steel involved is calculated by mass percentage as follows:

[0030] C: ≤0.03%, Si: ≤0.1%, Mn: ≤1%, Al: 0.02%~0.06%, P: ≤0.01%, S: ≤0.004%, N: ≤0.004%, Ti: 0.01%~0.08 %, Nb≤0.05%, the rest is Fe and unavoidable impurities.

[0031] preferred, see below figure 1 , the technological process (i.e. manufacturing method) of the 225MPa grade low yield point building anti-seismic steel comprises:

[0032] S101, molten steel is refined and then continuously cast to obtain a slab.

[0033] S102, heating the slab.

[0034] Preferably, the heating of the slab specifically includes: heating the slab to 1100°C to 1150°C.

[0035] S103, performing rough rolling.

[0036] S104, heating by electromagnetic induction.

[0037] Preferably, the heating by electromagnetic induction is specifically: heating to 1050° C. to 1100° C. by...

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Abstract

The invention discloses a production method of steel having 225 MPa stage of low yield point and used for building earthquake resistance. The steel comprises the following chemical components in percentage by mass: C not more than 0.03%, Si not more than 0.1%, Mn not more than 1%, 0.02-0.06% of Al, P not more than 0.01%, S not more than 0.004%, N not more than 0.004%, 0.01-0.08% of Ti, Nb not more than 0.05%, and the balance of Fe and inevitable impurities. Through a serial of processes of refining, continuous rolling, heating, rough milling, electromagnetic inductive heating, fine milling, laminar cooling and winding, the yielding strength of the steel having 225 MPa stage of low yield point and used for building earthquake resistance reaches 200-240 MPa stage, and the elongation is greater than 50%; and the steel has excellent plastic deformation and impact toughness, and has the advantages of lower alloy cost, easy process realization, excellent weldability and excellent low-cycle fatigue performance.

Description

technical field [0001] The present application relates to the technical field of steel production, in particular to a method for manufacturing anti-seismic building steel with a low yield point of 225MPa. Background technique [0002] Low yield point building seismic steel is mainly used for building dampers, which can effectively protect the main load-bearing structures and reduce the damage to buildings caused by vibration. These anti-seismic devices are subjected to earthquake loads before the main structural parts, and yield first, and absorb earthquake energy by repeated loads to protect the safety of the main structure of the building. Compared with other energy-consuming materials, it has the advantages of simple structure, economical and durable, convenient replacement after earthquake, and strong reliability. It can be used not only for the earthquake resistance of new buildings, but also for the improvement of the earthquake resistance of old buildings. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C22C33/04
Inventor 姚志强郭佳刘杰李飞崔阳朱国森
Owner SHOUGANG CORPORATION
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