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Steel pipe piercing plug and preparation method thereof

A technology of perforating plugs and steel pipes, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve problems such as heating, cracking, and sticking to steel

Inactive Publication Date: 2020-06-12
朗瑞(泰州)金属工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of piercing the low-alloy steel pipe, the solid tube blank is made into a hollow capillary tube, and the deformation of the metal is mainly carried out on the plug. The traditional round billet hot rolling technology and process are used in the piercing and rolling of large-scale steel pipes. Tools such as piercing plugs and guide plates cause a sudden increase in tool consumption due to the phenomenon of steel sticking. During the process of piercing and rolling round billets, the piercing plugs are subjected to axial compressive stress and radial tensile stress during the piercing process of high-temperature steel pipes at 1200-1300 ° C. Rotation makes the front part of the plug heat up sharply, causing the plug to fail due to defects such as head melting, cracking, and steel sticking
Therefore, the working condition of the plug is quite harsh. When the ordinary plug is used for piercing, a protective lubricating coating needs to be added to the surface of the plug during piercing and rolling. Its service life is generally 50 to 70 pieces. Due to frequent tool replacement, it seriously affects the normal production order. It also leads to defects on the surface of the product, and the yield is low, which does not meet the requirements of the existing production line and products

Method used

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  • Steel pipe piercing plug and preparation method thereof
  • Steel pipe piercing plug and preparation method thereof
  • Steel pipe piercing plug and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A steel pipe piercing plug, the components of the plug respectively include the following components according to the mass percentage:

[0044] C: 0.19%;

[0045] Si: 0.30%;

[0046] Mn: 0.30%;

[0047] P: 0.010%;

[0048] S: 0.005%;

[0049] Cr:1.20%;

[0050] Ni: 3.00%;

[0051] Mo:0.35%;

[0052] V:0.05%;

[0053] W:0.20%;

[0054] Al: 0.025%;

[0055]Cu: 0.06%;

[0056] The balance is Fe.

[0057] The preparation method is as follows:

[0058] Step 1: Forging; the raw materials are smelted according to the constituent elements and mass percentages to obtain steel ingots with specified chemical compositions, and the steel ingots are forged to make original rods;

[0059] Step 2: hot extrusion; heat the original rod to 1050°C, and undergo hot extrusion processing with a deformation rate ≥ 2.5 to obtain a grain-refined matrix with a grain size ≥ 7, and keep it warm for 3 hours;

[0060] Step 3: Turning; According to the technical size data of the plug, tur...

Embodiment 2

[0064] A steel pipe piercing plug, the components of the plug respectively include the following components according to the mass percentage:

[0065] C: 0.22%;

[0066] Si: 0.45%;

[0067] Mn: 0.5%;

[0068] P: 0.013%;

[0069] S:0.007%;

[0070] Cr:1.40%;

[0071] Ni: 3.2%;

[0072] Mo:0.45%;

[0073] V:0.10%;

[0074] W: 0.30%;

[0075] Al: 0.029%;

[0076] Cu: 0.08%;

[0077] The balance is Fe.

[0078] The preparation method is as follows:

[0079] Step 1: Forging; the raw materials are smelted according to the constituent elements and mass percentages to obtain steel ingots with specified chemical compositions, and the steel ingots are forged to make original rods;

[0080] Step 2: hot extrusion; heat the original rod to 1000°C, and undergo hot extrusion processing with a deformation rate ≥ 2.5 to obtain a grain-refined matrix with a grain size ≥ 7, and keep it warm for 4 hours;

[0081] Step 3: Turning; According to the technical size data of the plug, turn...

Embodiment 3

[0085] A steel pipe piercing plug, the components of the plug respectively include the following components according to the mass percentage:

[0086] C: 0.25%;

[0087] Si: 0.50%;

[0088] Mn: 0.55%;

[0089] P:0.015%;

[0090] S:0.010%;

[0091] Cr: 1.50%;

[0092] Ni: 3.50%;

[0093] Mo:0.55%;

[0094] V:0.15%;

[0095] W:0.40%;

[0096] Al: 0.03%;

[0097] Cu: 0.10%;

[0098] The balance is Fe.

[0099] The preparation method is as follows:

[0100] Step 1: Forging; the raw materials are smelted according to the constituent elements and mass percentages to obtain steel ingots with specified chemical compositions, and the steel ingots are forged to make original rods;

[0101] Step 2: hot extrusion; heat the original rod to 1150°C, and undergo hot extrusion processing with a deformation rate ≥ 2.5 to obtain a grain-refined matrix with a grain size ≥ 7, and keep it warm for 5 hours;

[0102] Step 3: Turning; According to the technical size data of the plug, turn...

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Abstract

The invention discloses a steel pipe piercing plug and a preparation method thereof. The plug provided by the invention comprises the following components in percentage by mass: 0.10-0.50% of C; 0.10-1.00% of Si; 0.10-0.80% of Mn; less than or equal to 0.020% of P; less than or equal to 0.01% of S; 0.60-5.0% of Cr; 2.00-8.00% of Ni; 0.10-2.00% of Mo; 0.01-1.00% of V; 0.10-2.00% of W; less than orequal to 0.03% of Al; less than or equal to 0.30% of Cu; and the balance of Fe . The plug with the specific components is treated through processes of temperature-controlled hot extrusion, machining,and controlled atmosphere oxidation, so that the plug with high comprehensive performance is obtained; and the product life is more than doubled, and at the same time, the surface quality and the yield of a plug pierced steel pipe product are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of steel pipe perforation, and in particular relates to a steel pipe perforation plug and a preparation method thereof. Background technique [0002] The main function of alloy steel pipe is to be used in high-pressure and high-temperature pipelines such as power plants, nuclear power plants, high-pressure boilers, high-temperature superheaters and reheaters, and buildings. There are many material classifications. In short, they can be divided into high, medium and low. Alloy steel pipes, alloy steels containing no more than 5% of the total mass fraction of alloy elements are called low-alloy steels, such as: CrWMn, 9SiCr, 9Mn2V, GCrl5; low-alloy steel pipes are mainly used in bridges, automobile beams and other fields, and the head is low The key to the production of alloy steel pipes, the quality of tools and the length of service life directly affect the production, quality and economic benefits of low al...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/42C22C38/06C23C8/18B23P15/00B21B25/00
CPCB21B25/00B23P15/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C23C8/18
Inventor 洪杰
Owner 朗瑞(泰州)金属工具有限公司