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High-strength high-toughness pipe for crane boom and manufacturing method for high-strength high-toughness pipe

A manufacturing method and high toughness technology, applied in the field of metallurgical technology, to achieve the effect of simple manufacturing process, good performance uniformity, and easy realization

Inactive Publication Date: 2016-10-05
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In China, some people used the Cr-Ni-Mn-Mo-V-B alloy steel with good low carbon to trial-produce high-strength boom tubes, but they have not been put into production and use in batches.

Method used

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  • High-strength high-toughness pipe for crane boom and manufacturing method for high-strength high-toughness pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The mass percentage of the chemical composition of the high-strength and high-toughness crane jib pipe is:

[0024] C 0.15%, Si0.50%, Mn 1.40%, P 0.010%, S 0.008%, Cr 0.46%, Ni 0.13%, Mo 0.34%, V 0.08%, Ti≤0.05%, W 0.40%, Al 0.042%, Cu≤0.02%, Nb≤0.05%, N≤0.007%, the rest are iron and impurities.

[0025] Process route: hot metal pretreatment→converter smelting→LF+VD refining→continuous casting and rolling→hot rolling→heat treatment→flaw detection.

[0026] Refining outside the furnace: Add ferro-titanium 6 minutes before the end of refining.

[0027] Hot rolling process: the heating temperature of the tube billet is 1265°C; the continuous rolling is made of a mandrel with no defects on the surface, and graphite is used for lubrication; the sizing is descaled with high-pressure water.

[0028] Heat treatment process: Quenching and tempering treatment: quenching temperature 930°C to fully austenitize the steel pipe, water quenching to ensure the center line of the steel...

Embodiment 2

[0030] The high-strength and high-toughness crane jib tube has a chemical composition in mass percentage of:

[0031] C 0.17%, Si 0.35%, Mn 1.30%, P 0.013%, S 0.005%, Cr 0.40%, Ni 0.20%, Mo 0.28%, V 0.12%, Ti≤0.05%, W 0.34%, Al 0.03%, Cu ≤0.02%, Nb≤0.05%, N≤0.007%, the remainder is iron and impurities.

[0032] Process route: hot metal pretreatment→converter smelting→LF+VD refining→continuous casting and rolling→hot rolling→heat treatment→flaw detection.

[0033] Refining outside the furnace: Add ferro-titanium 8 minutes before the end of refining.

[0034] Hot rolling process: the heating temperature of the tube billet is 1275°C; continuous rolling is carried out with a mandrel with no defects on the surface, and graphite is used for lubrication; high-pressure water is used for descaling for sizing.

[0035] Heat treatment process: Quenching and tempering treatment: Quenching temperature 925°C to fully austenitize the steel pipe, water quenching to ensure the center line of...

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Abstract

The invention provides a high-strength high-toughness pipe for a crane boom. The high-strength high-toughness pipe consists of the following components in percentage by mass: 0.14-0.18% of C, 0.30-0.50% of Si, 1.30-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 0.35-0.50% of Cr, 0.10-0.20% of Ni, 0.25-0.38% of Mo, 0.07-0.12% of V, less than or equal to 0.05% of Ti, 0.30-0.45% of W, 0.02-0.05% of Al, less than or equal to 0.02% of Cu, less than or equal to 0.05% of Nb, less than or equal to 0.007% of N, and the balance iron and impurities. Ferrotitanium is added 5-8 minutes before ending external refining. A pipe blank heating temperature ranges from 1260 DEG C to 1280 DEG C; a steel pipe quenching temperature ranges from 920 DEG C to 930 DEG C, a tempering temperature ranges from 690 DEG C to 700 DEG C, and thermal insulation time ranges from 40 minutes to 60 minutes. The process is simple and easy to realize; the boom is welded and judged according to the technical requirements of standard Pressure-bearing Equipment Welding Procedure Qualification NB / T47014-2011; bending tests such as a room-temperature tensile test, a lateral bending test, a surface bending test and a back bending test as well as a low-temperature impact test at (-)40 DEG C of the boom are qualified; and moreover, production performances are uniform and stability is good.

Description

technical field [0001] The invention belongs to the technical field of metallurgical technology, and in particular relates to a high-strength and high-toughness seamless steel pipe for a boom of a crane and a manufacturing method thereof. Background technique [0002] Lifting industry is one of the important basic industries in national economic construction. Hydraulic crawler crane is a kind of self-propelled crane used in high-rise building construction. It is a lifting operation machine with high technical content, complicated manufacturing process and unique performance in construction machinery. It has relatively large lifting capacity and small turning radius. It has the characteristics of hoisting, low specific pressure on the crawler belt to the ground, low environmental requirements, good operation stability, and free replacement of the truss combination, so it is widely used in building bridges, installing power generation equipment, installing oil refining equipme...

Claims

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Application Information

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IPC IPC(8): C22C38/50C22C38/48C22C38/46C21D8/10
Inventor 李道刚董芬陈勇李应雄王茹洪汛高山吴宇新张尧杜猛
Owner ANGANG STEEL CO LTD
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