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High antiwear concrete conveying pipe and production method thereof

A technology for a concrete conveying pipe and a production method, which is applied to the high-wear-resistant concrete conveying pipe and the production field thereof, can solve the problems of poor abrasion resistance, low alloy content, poor thermoplasticity and pressure processing performance, etc., and achieves short production process and wall thickness. The effect of good uniformity and excellent anti-wear performance

Inactive Publication Date: 2008-12-17
CHENGDU TIANYUAN XINTAI COMPOSITE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low alloy content of these low-alloy pipes and the lack of heat treatment after forming, the structure is generally ferrite + pearlite, and the hardness is low, which will inevitably lead to poor wear resistance. Or the service life of the seamless pipe is about 8,000 cubic concrete and 14,000 cubic concrete, respectively. The life of the boom pump pipe is shorter. The service life of the concrete delivery pipe specially made by a well-known domestic pump factory is 50Mn2, and the hardness is about HRC30. The service life is only about 20,000 cubic concrete , it is difficult to meet the needs of production, so the commercial concrete production industry is in urgent need of high wear-resistant steel pipes; however, due to the alloy with high wear resistance, its thermoplasticity and pressure processing performance are poor, the traditional welded pipe or rolled pipe production process is used Difficult to make steel pipe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] It is smelted in a 0.5t medium frequency induction furnace, and the raw material is mainly scrap steel. During the smelting, the composition of molten steel is adjusted as follows (mass%): C 0.15%, Si 0.1%, Mn 1.6%, Cr 0.3%, Mo 0.5%, V 0.1%, Ti 0.06%, Ni 0.03%, Cu 0.5%, Nb 0.02%, Al 0.01%, B 0.0005%, Re 0.02%, N 0.001%, S 0.002%, P 0.002%, the balance is Fe, and the molten steel temperature is 1550℃ . When the mold cylinder is used for the first time, it is baked first, and then the inner surface of the mold cylinder is sprayed with quartz or zircon coating, and after spraying, the inner surface is baked. Baking is to send the mold tube into the electric furnace for baking, the baking temperature is 200-300 ℃, and the time is 20-40 minutes; 20-30 minutes.

[0025] Spray quartz paint on the inner wall of the DN134×3400 type cylinder, bake it in an electric furnace at 200°C for 40 minutes, and then place it on a centrifuge. When casting, the rotation speed of the mold c...

Embodiment 2

[0028] A 0.8t intermediate frequency induction furnace is used for smelting, and the raw materials are mainly scrap steel and alloys. During smelting, the composition of molten steel is adjusted as follows (mass%): C 0.4%, Si 2.0%, Mn 3.0%, Cr 2.0%, V 0.02%, Ti 0.01% , Nb 0.06%, Al 0.05%, B 0.005%, Re 0.06%, N 0.02%, S 0.035%, P 0.035%, the balance is Fe, and the temperature of molten steel is 1650 ℃. Spray quartz paint on the inner wall of the DN134×3400 type cylinder, bake it in an electric furnace at 300°C for 20 minutes, and then place it on a centrifuge. When casting, the rotation speed of the mold cylinder is 2500r / min, and the casting speed of molten steel is 150kg / s, and the molten steel is solidified after casting After 4 minutes, the cast pipe of DN129×26.7×3150 is obtained by demoulding. After the cast pipe is cooled to room temperature, it is shot blasted, and the cast pipe after shot blasting is cut into 2 equal lengths of DN125×26.7×1575 cast pipe and sent to φ90 ...

Embodiment 3

[0031] The 1t electric arc furnace is used for smelting, and the raw material is mainly scrap steel. The material composition (mass%) of cast pipe is: C 0.3%, Si 1.0%, Mn 2.6%, Cr 1.5%, Mo 0.35%, V 0.08%, Ti 0.05%, Ni 0.02%, Cu 0.25%, Nb 0.04% , Al 0.03%, B 0.0025%, Re 0.04%, N 0.01%, S 0.015%, P 0.03%, the balance is Fe, and the molten steel tapping temperature is 1600°C. Spray quartz paint on the inner wall of the DN134×3400 type cylinder, spray the inside of the type cylinder with a natural gas flame to the outer surface of the type cylinder at 200°C for 25 minutes, and place it on a centrifuge. The centrifugal casting process is as follows: when casting, the rotation speed of the type cylinder The casting speed of molten steel is 2000r / min, and the casting speed of molten steel is 100kg / s. After the molten steel is cast and solidified for 3 minutes, it is demoulded to obtain a cast pipe of DN129×26.7×3150. After the cast pipe is cooled to normal temperature, it is shot bla...

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Abstract

The invention discloses a concrete delivery pipe with high-wearing feature. According to mass percentage, the following materials are adopted: 0.15 to 0.4 percent of C, 0.1 to 2.0 percent of Si, 1.6 to 3.0 percent of Mn, 0.3 to 2.0 percent of Cr, 0 to 0.5 percent of Mo, 0.02 to 0.1percent of V, 0.01 to 0.06 percent of Ti, 0 to 0.03 percent of Ni, 0 to 0.5 percent of Cu, 0.02 to 0.06 percent of Nb, 0.01 to 0.05 percent of Al, 0.0005 to 0.005 percent of B, 0.02 to 0.06 percent of Re, 0 to 0.02 percent of N, 0 to 0.035 percent of S, 0 to 0.035 percent of P and the rest being Fe, and then the steps of smelting, centrifugal casting, hot rolling, controlled cooling, etc. are carried out to the materials. The production process of the invention is simple and short; the produced delivery pipe has martensite and bainite metallographic structure with high-wearing feature and a service life 4 to 20 times higher than No.20 seamless pipe.

Description

Technical field: [0001] The invention relates to a seamless steel pipe and its production method, in particular to a high wear-resistant concrete delivery pipe and its production method. Background technique: [0002] At present, concrete delivery pipes for various types of concrete pump trucks, such as various types of towed concrete delivery pumps and boom pumps, generally use No. 20 steel hidden seam welded pipes or rolled seamless pipes. Due to the low alloy content of these low-alloy pipes and the lack of heat treatment after forming, the structure is generally ferrite + pearlite, and the hardness is low, which will inevitably lead to poor wear resistance. Or the service life of the seamless pipe is about 8,000 cubic concrete and 14,000 cubic concrete, respectively. The life of the boom pump pipe is shorter. The service life of the concrete delivery pipe specially made by a well-known domestic pump factory is 50Mn2, and the hardness is about HRC30. The service life is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58B23P15/00B22D13/02B21C37/06
Inventor 张永刚秦劲松
Owner CHENGDU TIANYUAN XINTAI COMPOSITE MATERIAL
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