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Hot rolling seamless steel pipe mandrel preparation method

A seamless steel pipe and mandrel technology, which is applied in the field of iron and steel metallurgy, can solve the problems of affecting the service life, the difficulty of reasonably balancing high-temperature strength and toughness, and the failure of mandrels, etc., to achieve fine grains, considerable economic benefits, and improve the structure of castings Effect

Inactive Publication Date: 2014-05-21
WUXI XINSANZHOU STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through a lot of theoretical research and practical verification, combined with different requirements for use, the material of the mandrel is generally selected from alloy tool steel (such as H13) or alloy structural steel (such as 30CrNi3, 35CrMo, etc.), which are always high-temperature strength and toughness. It is difficult to balance reasonably, causing various forms of mandrel failure and affecting its service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing a hot-rolled seamless steel pipe mandrel, the chemical composition of the mandrel is composed of the following components in weight percentage: C: 0.4, Si: 0.4, Mn: 0.8, Cr: 3.4, Ni: 4.5 , W: 3.4, V: 0.4, Co: 1.3, Al: 0.1, Ce: 0.25, the balance being Fe and unavoidable impurities; the preparation method comprises the following steps:

[0018] 1) Batching smelting: ensure that the composition of molten steel is uniform;

[0019] 2) Pouring: There are two ways, one, before pouring, the axial direction of the core rod mold to be poured is perpendicular to the main shaft of the centrifuge, and the nose of the core rod faces outward; The axial direction of the casting mandrel mold is parallel to or coincident with the main shaft of the centrifuge, and the nose of the mandrel is facing down; when pouring, the molten metal will enter the mandrel mold cavity in sequence, and the centrifugal casting machine rotates at 200rpm; when all the molten steel is i...

Embodiment 2

[0022] A method for preparing a hot-rolled seamless steel pipe mandrel, the chemical composition of the mandrel is composed of the following components in weight percentage: C: 0.5, Si: 0.2, Mn: 1.0, Cr: 3.2, Ni: 5.5 , W: 3.2, V: 0.6, Co: 1.1, Al: 0.3, Ce: 0.15, the balance being Fe and unavoidable impurities; the preparation method includes the following steps:

[0023] 1) Batching smelting: ensure that the composition of molten steel is uniform;

[0024] 2) Pouring: There are two ways, one, before pouring, the axial direction of the core rod mold to be poured is perpendicular to the main shaft of the centrifuge, and the nose of the core rod faces outward; The axial direction of the casting mandrel mold is parallel to or coincident with the main shaft of the centrifuge, and the nose of the mandrel is facing down; when pouring, the molten metal will enter the mandrel mold cavity in sequence, and the centrifugal casting machine rotates at 210rpm; when all the molten steel is in...

Embodiment 3

[0027] A method for preparing a hot-rolled seamless steel pipe mandrel, the chemical composition of the mandrel is composed of the following components in weight percentage: C: 0.45, Si: 0.3, Mn: 0.9, Cr: 3.3, Ni: 5.0 , W: 3.3, V: 0.5, Co: 1.2, Al: 0.2, Ce: 0.20, the balance being Fe and unavoidable impurities; the preparation method includes the following steps:

[0028] 1) Batching smelting: ensure that the composition of molten steel is uniform;

[0029] 2) Pouring: There are two ways, one, before pouring, the axial direction of the core rod mold to be poured is perpendicular to the main shaft of the centrifuge, and the nose of the core rod faces outward; The axial direction of the casting mandrel mold is parallel to or coincident with the main shaft of the centrifuge, and the nose of the mandrel is facing down; when pouring, the molten metal will enter the mandrel mold cavity in sequence, and the centrifugal casting machine rotates at 205rpm; when all the molten steel is i...

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Abstract

The present invention discloses a hot rolling seamless steel pipe mandrel preparation method. The chemical components of the mandrel comprise, by weight, 0.4-0.5% of C, 0.2-0.4% of Si, 0.8-1.0% of Mn, 3.2-3.4% of Cr, 4.5-5.5% of Ni, 3.2-3.4% of W, 0.4-0.6% of V, 1.1-1.3% of Co, 0.1-0.3% of Al, 0.15-0.25% of Ce, and the balance of Fe and unavoidable impurities. The preparation method comprises: a) material preparation and smelting; 2) casting, wherein metal liquids sequentially enter a mandrel mold cavity during casting, the centrifugal casting machine rotation speed is 200-210 rpm, and the centrifugal casting machine rotation speed is adjusted to 310-330 rpm after the molten steel is completely injected into the mold cavity; and 3) a heat treatment.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing a hot-rolled seamless steel pipe mandrel. Background technique [0002] The mandrel is one of the most consumed key tools in the production of hot-rolled seamless steel pipes. Due to the harsh working conditions of the mandrel, when piercing, the working temperature of the mandrel is as high as 1000°C, and at the same time, it must bear huge axial pressure, radial pressure, rotational friction, and rapid cooling and heat stress. The role of mechanical fatigue and thermal fatigue. Under such harsh working conditions, mandrels are often scrapped in the form of failures such as nose collapse, sticking to steel, and cracking. The service life of mandrels is shortened and the frequency of replacement is high, which affects the production efficiency and quality of steel pipes and has a large-scale impact on the organization. Both the productio...

Claims

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Application Information

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IPC IPC(8): C22C38/52B22D13/00
Inventor 林永峰
Owner WUXI XINSANZHOU STEEL
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