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Steel for high-strength corrosion-resistant reinforcing steel bar containing rare earth elements and heat treatment technology thereof

A rare earth element, high-strength technology, applied in the field of steel for high-strength corrosion-resistant steel bars and its heat treatment process, can solve the problems of poor oxidation resistance, easy corrosion and rust of steel, and reduced safety, so as to reduce overheating sensitivity And temper brittleness, low production cost, and the effect of improving strength

Active Publication Date: 2015-01-28
TIANSHUN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Steel is widely used in the construction industry, especially for the supporting role of large span and complex structure. Its importance is self-evident. However, the existing steel has low strength and short service life. Where the environment is relatively harsh, steel is easy to corrode and rust, and its oxidation resistance is not good, the service life is short, which increases the cost, and will reduce its safety after a long time, causing safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a high-strength corrosion-resistant steel for steel bars containing rare earth elements. The chemical composition is: C: 0.02%, Ni: 5.3%, Cr: 2.47%, Si: 1.23%, Mn: 2.35%, Cu: 2.8%, V: 0.26%, Mo: 0.31%, P: 0.036%, W: 0.65%, rare earth elements: 1.15%, and the balance is Fe; rare earth elements are: La: 3.2%, Gd: 6.5%, Pr: 12.5%, Er: 16%, Ho: 5.8%, Nd: 13.5%, Sm: 14.8%, Lu: 10.5%, and the balance is Yb; the invention also provides the high-strength The heat treatment process of steel used for corroding steel bars is carried out according to the following steps: Step (1): first heat treatment: put the steel in a high-frequency furnace and heat it to 1080 ° C, keep it for 4 hours, and then use water cooling at 16 ° C / s Speed ​​cooling to 720°C, then cooling with oil to 280°C at a rate of 12°C / s; then quenching treatment: put it in a high-frequency furnace and heat to 625°C, keep it for 1 hour, and cool the steel with cooling water at a rate of 8°C...

Embodiment 2

[0028] This embodiment provides a high-strength corrosion-resistant steel containing rare earth elements: the chemical composition is: C: 0.05%, Ni: 5.6%, Cr: 2.49%, Si: 1.26%, Mn: 2.38%, Cu: 3.2%, V: 0.28%, Mo: 0.38%, P: 0.038%, W: 0.68%, rare earth elements: 1.18%, and the balance is Fe; the rare earth elements are: La: 3.5%, Gd: 6.8%, Pr: 14.5%, Er: 18%, Ho: 6.5%, Nd: 13.9%, Sm: 15.3%, Lu: 10.8%, and the balance is Yb; the invention also provides the high-strength The heat treatment process of steel used for corroding steel bars is carried out according to the following steps: Step (1): first heat treatment: put the steel in a high-frequency furnace and heat it to 1100°C, keep it warm for 6 hours, and then use water cooling at 20°C / s Cool at a speed of 730°C, then cool with oil to 300°C at a rate of 14°C / s; Cool down to room temperature at the speed; step (2): Clean the cooled steel surface with an ultrasonic cleaning tank, and then perform quenching and tempering heat tre...

Embodiment 3

[0030] This embodiment provides a high-strength corrosion-resistant steel containing rare earth elements: the chemical composition is: C: 0.03%, Ni: 5.5%, Cr: 2.48%, Si: 1.25%, Mn: 2.37%, Cu: 2.9%, V: 0.27%, Mo: 0.35%, P: 0.032%, W: 0.67%, rare earth elements: 1.16%, and the balance is Fe; rare earth elements are: La: 3.3%, Gd: 6.7%, Pr: 12.8%, Er: 17%, Ho: 6.2%, Nd: 13.8%, Sm: 14.9%, Lu: 10.6%, and the balance is Yb; the invention also provides the high-strength The heat treatment process of steel used for corroding steel bars is carried out according to the following steps: Step (1): first heat treatment: put the steel in a high-frequency furnace and heat it to 1090 ° C, keep it for 5 hours, and then use water cooling at 18 ° C / s Speed ​​cooling to 725°C, then cooling with oil to 290°C at a rate of 13°C / s; then quenching treatment: put it in a high-frequency furnace and heat it to 630°C, keep it warm for 1.8h, and cool the steel with cooling water at a temperature of 9°C / s...

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Abstract

The invention discloses steel for a high-strength corrosion-resistant reinforcing steel bar containing rare earth elements and a heat treatment technology thereof. The steel comprises the following chemical compositions by mass percent: 0.02-0.05% of C, 5.3-5.6% of Ni, 2.47-2.49% of Cr, 1.23-1.26% of Si, 2.35-2.38% of Mn, 2.8-3.2% of Cu, o.26-0.28% of V, 0.31-0.38% of Mo, 0.036-0.038% of P, 0.65-0.68% of W, 1.15-1.18% of rare earth elements and the balance of Fe. The steel for the high-strength corrosion-resistant reinforcing steel bar containing rare earth elements is high in strength, long in service life, low in production cost, simple in heat treatment technology and high in working efficiency, the corrosion resistance, oxidation resistance and high temperature resistance are obviously improved, the design requirement can be reached by reducing the using amount of steel in the application, and the safety is high.

Description

technical field [0001] The invention relates to steel for high-strength corrosion-resistant steel bars, in particular to steel for high-strength corrosion-resistant steel bars containing rare earth elements and a heat treatment process thereof. Background technique [0002] Steel is widely used in the construction industry, especially for the supporting role of large span and complex structure. Its importance is self-evident. However, the existing steel has low strength and short service life. Where the environment is relatively harsh, steel is easy to corrode and rust, and its oxidation resistance is not good, the service life is short, which increases the cost, and will reduce its safety after a long time, resulting in potential safety hazards. Contents of the invention [0003] The technical problem to be solved by the present invention is to propose a rare earth element-containing high-strength corrosion-resistant steel for steel and its heat treatment process. The rar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D6/00C21D1/18C21D1/25C21D1/773
CPCC21D1/18C21D1/773C22C38/02C22C38/18C22C38/40C22C38/42C22C38/44C22C38/46C22C38/58
Inventor 姚圣法吴海洋
Owner TIANSHUN GROUP
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