Manufacture method for manufacturing cantilever steel pipe with high strength and high toughness by using hot-rolling coiled plate

A technology with high strength and toughness and a manufacturing method, which is applied in the direction of improving energy efficiency and process efficiency, and can solve the problems of poor shape accuracy of the boom, expensive welding wire, and low manufacturing efficiency.

Active Publication Date: 2011-07-20
武汉钢实机电设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long boom, when the boom is not working, all sections of the boom must shrink to the bottom section, so the flatness of the steel plate is required to be less than 3‰, even if the steel plate has a flatness of ≤3‰, After being bent and welded into a car boom, its straightness is also difficult to meet manufacturing needs
The composition of the welding material for boom welding and the base metal is very different, and the welding wire is expensive, and the performance uniformity after welding is poor. The impact toughness of the weld seam, fusion line, and heat-affected zone is much lower than that of the base metal. Internal stress is detrimental to the life and safety of the boom, and the welded seam affects the appearance of the boom
The traditional boom manufacturing process is complicated, the manufacturing efficiency is low, the manufacturing cost is high, the overall performance consistency of the boom is poor, the shape accuracy of the boom is poor, and the straightness of the boom is poor

Method used

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  • Manufacture method for manufacturing cantilever steel pipe with high strength and high toughness by using hot-rolling coiled plate
  • Manufacture method for manufacturing cantilever steel pipe with high strength and high toughness by using hot-rolling coiled plate
  • Manufacture method for manufacturing cantilever steel pipe with high strength and high toughness by using hot-rolling coiled plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] When the mass percentage of each chemical element is: C: 0.10-0.18%, Si: 0.10-0.45%, Mn: 0.80-1.45%, Ni: 0.02-0.60%, Cr: 0.15-0.55%, Mo: 0.20-0.55% , Cu: 0-0.30%, Nb: 0.010-0.060%, V: 0.020-0.055%, Ti: 0.002-0.030%, Al: 0.010-0.065%, B: 0.0005-0.0040%, Zr: 0-0.0005%, When P<0.020%, S<0.010%, N<0.0080%, and the rest are iron boom steel pipes, the heat treatment process is as follows: rolling ERW steel pipes into the precise size and shape of boom steel pipes in the pass of the special-shaped steel pipe unit The tube billet is heated to 910-960°C in the induction heating equipment for austenitization, the heating time is 60-140s, the cooling rate of heating and quenching is ≥5°C / s, and it is tempered in the induction heating equipment at 370-420°C. The tempering time is 80-180s, and the tempered martensite structure is obtained. Obtain high-strength and tough boom steel pipes with mechanical properties: Reh≥900MPa, Rm≥950-1100MPa, A%≥14%, Akv-40°C≥47J.

Embodiment 2

[0073] When the mass percentage of each chemical element is: C: 0.12-0.20%, Si: 0.10-0.45%, Mn: 0.80-1.45%, Ni: 0.02-0.65%, Cr: 0.15-0.60%, Mo: 0.25-0.60% , Cu: Cu: 0-0.30%, Nb: 0.010-0.060%, V: 0.025-0.055%, Ti: 0.002-0.030%, Al: 0.010-0.065%, B: 0.0005-0.0040%, Zr: 0-0.0005 %, P<0.020%, S<0.010%, N<0.0080%, and the rest are iron hot-rolled coils. Solidification, the heating time is 60-140s, the heating and quenching cooling rate is ≥5°C / s, and the induction heating equipment is heated to 340-390°C for tempering, and the tempering time is 80-180s to obtain a tempered martensite structure. Obtain high-strength and tough boom steel pipes with mechanical properties: Reh≥960MPa, Rm≥980-1150MPa, A%≥14%, Akv-40°C≥47J.

Embodiment 3

[0075] When the mass percentage of each chemical element is: C: 0.17%, Si: 0.25%, Mn: 1.25%, Ni: 0.05%, Cr: 0.21%, Mo: 0.61%, Cu: 0.01%, Nb: 0.015%, V : 0.038%, Ti: 0.025%, Al: 0.035%, B: 0.0015%, P: 0.018%, S: 0.004%, N: 0.0035%, the rest is made of iron 12mm thick hot-rolled coil manufacturing yield strength Reh ≥ 1030MPa For high-strength and high-toughness steel plates, the heat treatment process is as follows: heating to 940°C in induction heating equipment for austenitization, heating time is 100s, quenching cooling rate is 20°C / s, and heating to 290°C in induction heating equipment Tempering, tempering time 120s. The mechanical properties are: Reh: 1080MPa, Rm: 1280MPa, A%: 13%, Akv-40°C: 98J high strength and toughness boom steel pipe.

[0076] figure 1 It shows the CCT curve of the Reh 1030MPa high-strength and toughness boom steel pipe manufactured by hot-rolled coils using a Formastor-F thermal dilatometer, combined with metallographic structure observation and ha...

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Abstract

The invention relates to a manufacture method for manufacturing a cantilever steel pipe with high strength and high toughness by using a hot-rolling coiled plate. The method comprises the following steps that: firstly, a hot-rolling coiled plate is rolled into an ERW welding pipe by using an ERW pipe welding machine set, the ERW welding pipe is heated by induction in induction heating equipment, the heating time is within 60-140s, the ERW welding pipe is heated to 910DEG C to 960DEG C, and austenitizing is carried out; then, the ERW welding pipe enters a water-cooling or steam-cooling quenching machine set to carry out quenching, the quenching and cooling speed of the ERW welding pipe is greater than or equal to 5DEG C / s, and a quenched martensite organization is obtained after quenching;tempering is carried out after quenching, induction heating is carried out by adopting the induction heating equipment in the tempering, the heating temperature of the quenched martensite organization is 220DEG C to 440DEG C, the tempering time is 80 to 180s, and a tempered martensite organization is obtained; and finally, straightening, flaw detection, surface inspection and sampling inspection are carried out to finally obtain the cantilever steel pipe with excellent performance, high strength and high toughness. The invention has the advantages that the invention adopts a heat treatment method of induction heating to cause the heated cantilever steel pipe to be evenly heated, decomposes the residual austenite when obtaining the tempered martensite after induction tempering and has low equipment investment, little maintenance cost of the equipment, small occupation area and small environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of mechanical structural parts in metallurgical manufacturing, and in particular relates to a method for manufacturing high-strength and toughness boom steel pipes with hot-rolled coils. Background technique [0002] High-strength and high-toughness special-shaped steel pipes for the boom of automobile cranes (hereinafter referred to as boom steel pipes) are usually made of high-strength and high-toughness steel plates, which are bent and formed and then welded into boom steel pipes. Due to the long boom, when the boom is not working, all sections of the boom must shrink to the bottom section, so the flatness of the steel plate is required to be less than 3‰, even if the steel plate has a flatness of ≤3‰, After being bent and welded into a car boom, its straightness is also difficult to meet manufacturing needs. The composition of the welding material for boom welding and the base metal is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54
CPCY02P10/20Y02P10/25
Inventor 马景怡
Owner 武汉钢实机电设备有限公司
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