Forming process of chromium-molybdenum-vanadium steel seamless taper pipe

A technology of seamless tapered tube and forming process, which is applied in the field of tapered tube manufacturing, can solve the problems of coarse product grains, low material utilization rate, and many processing techniques, and achieve excellent mechanical properties, uniform and fine material grains, and avoid cracks The effect of injury

Active Publication Date: 2020-12-18
杭州淳通新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can be used as the processing of ordinary steel tapered tubes. The product has coarse grains and needs to be cut and shaped after forming. The material utilization rate is low and there are many subsequent processing processes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one: a kind of forming process of chromium molybdenum vanadium steel seamless tapered pipe, comprising the following contents:

[0029] (1) Alloy tool steel materials are selected, and the alloying elements added by mass percentage in carbon tool steel are as follows: C=1.4; Mn=0.60; Si=0.60; P=0.030; S=0.030; Cr=11.00; Mo= 0.70; V=1.10; Co=1.00; others are iron.

[0030] (2) Make the finished product of equal-diameter straight pipe, and its material hardness value is HB=255.

[0031] (3) The straight pipe with equal diameter is formed into a tapered pipe through a multi-roller cold-pressed tapered pipe forming device, and the mandrel is prepared according to the standard inner hole value +0.20mm. The specific process is to install the straight pipe with equal diameter on the pipe driving device. Under the action of the pipe driving device, the equal-diameter straight pipe itself rotates, and is input into the tapered pipe forming roller mold along a straigh...

Embodiment 2

[0040] Embodiment 2: A forming process of a chrome-molybdenum-vanadium steel seamless tapered pipe. The forming process is the same as that of the embodiment 1. Taking the Φ146*12.4 straight pipe as an example, if the diameter of the small end is 50mm, it belongs to the pipe body change rate If the compression ratio is greater than 0.05, the conical tube forming process is carried out 1*3 times as in Example 1, and additional heat preservation and tempering process is added. The technical requirement is to keep heat at 400-420°C for 4 hours.

[0041] The mechanical properties of the finished tapered pipe are tested and the indicators are as follows:

[0042] 1. Tensile strength (бb): 1050MPa.

[0043] 2. Elongation (δ): 9.

[0044] 3. Hardness: Brinell hardness (HB): 255.

[0045] 4. The surface roughness of the pipe body Ra (μm): 12.5-25 in the state of not removing material such as unpolished.

[0046] 5. Roundness: 0.006mm.

Embodiment 3

[0047] Embodiment three: a kind of forming process of chromium molybdenum vanadium steel seamless tapered pipe, comprising the following contents:

[0048] (1) Alloy tool steel materials are selected, and the alloying elements added by mass percentage in carbon tool steel are as follows: C=1.5; Mn≤0.60; Si≤0.60; P≤0.030; S≤0.030; Cr=12.00; Mo= 0.95; V≤1.10; Co≤1.00; others are iron.

[0049] (2) Make the finished product of equal-diameter straight pipe, and its material hardness value is HB=255.

[0050] (3) The straight pipe with equal diameter is formed into a tapered pipe through a multi-roller cold-pressed tapered pipe forming device, and the mandrel is prepared according to the standard inner hole value +0.20mm. The specific process is to install the straight pipe with equal diameter on the pipe driving device. Under the action of the pipe driving device, the equal-diameter straight pipe itself rotates, and is input into the tapered pipe forming roller mold along a strai...

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Abstract

The invention discloses a forming process of a chromium-molybdenum-vanadium steel seamless taper pipe. The forming process is characterized by comprising the following steps: an alloy tool steel material is selected, and following alloy elements in percentage by mass are added to carbon tool steel: 1.4%-1.6% of C, less than or equal to 0.60% of Mn, less than or equal to 0.60% of Si, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 11.00%-13.00% of Cr, 0.70%-1.20% of Mo, less than or equal to 1.10% of V, and less than or equal to 1.00% of Co; and the hardness value HB of anequal-diameter straight pipe finished product material is less than or equal to 255. According to the forming process, taper pipe forming is conducted through a cold pressing type taper pipe formingdevice, and the pipe body change rate, the forming environment temperature and other technological means are kept; and the taper pipe is prevented from being formed in a material fatigue state in theforming process by controlling constant low temperature, cold pressing and compression ratio and designing roundness in a high-hardness state, so that not only are the forming sizes inside and outsidethe product ensured, but also the grains of the material inside the product are uniform and fine, and various good mechanical properties are achieved.

Description

technical field [0001] The invention relates to a tapered pipe manufacturing technology, in particular to a forming process of a chromium molybdenum vanadium steel seamless tapered pipe. Background technique [0002] There are basically the following types of seamless tapered pipe processing in the disclosed technology. One is the hot gadolinium type. For example, the patent announcement number is CN104438398A, a seamless steel pipe tapered processing technology designed. The heating device and the variable cross-section forming rotary die draw the heated steel pipe through the drawing extension device. The temperature is controlled at about 1200°C, and the variable cross-section forming die is used to extrude to achieve the desired seamless steel pipe. This method can be used as the processing of common steel tapered tubes, the product has coarse grains, and needs to be cut and shaped after forming, the material utilization rate is low, and there are many subsequent process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/18C22C38/02C22C38/04C22C38/22C22C38/24C22C38/30
CPCB21C37/18C22C38/04C22C38/02C22C38/002C22C38/22C22C38/24C22C38/30Y02P70/10
Inventor 周爱民
Owner 杭州淳通新材料科技有限公司
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