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Improved semi-steel material seamless steel pipe slanting roller and processing technology thereof

A technology of seamless steel pipe and processing technology, which is applied in the field of rolls, can solve problems such as short service life, and achieve the effects of improving wear resistance, increasing density, and refining microstructure

Pending Publication Date: 2019-09-20
常州市中宇合金轧辊厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcoming of short service life in the prior art, and propose an improved semi-steel seamless steel pipe skew roll

Method used

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  • Improved semi-steel material seamless steel pipe slanting roller and processing technology thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, a processing technology of an improved semi-steel seamless steel pipe skew roll, comprising the following steps:

[0030] S1. Determine the chemical composition: the chemical composition of the upper roll 1 and the lower roll 2 is C: 1.35%; Si: 0.35%; Mn: 0.80%; P: 0.010%; S: 0.010%; Ni: 1.50%; Cr : 1.20%; Mo: 0.50%; V: 0.20%;

[0031] S2. Smelting: Melt semi-steel in an intermediate frequency induction furnace, during which a 40-mesh slagging agent is added for slagging (the slagging agent is made by mixing quartz sand, block lime and fluorite powder in a ratio of 7:2.5:0.5), when When the temperature of the molten steel reaches 1450°C and the scum is white, slag occurs, and then when the steel temperature is 1520°C, 2kg / t yttrium-based heavy rare earth molten steel modifier is added, and when the steel temperature reaches 1540°C, the steel is tapped and blown with argon to shake to obtain molten steel ;

[0032] S3. Pouring: calm the molten steel produ...

Embodiment 2

[0035] Embodiment 2, an improved processing technology of semi-steel material seamless steel pipe skew roll, comprising the following steps:

[0036] S1. Determine the chemical composition: the chemical composition of the upper roll 1 and the lower roll 2 is C: 1.40%; Si: 0.55%; Mn: 1.00%; P: 0.020%; S: 0.015%; Ni: 2.50%; Cr : 1.50%; Mo: 0.60%; V: 0.30%;

[0037] S2. Smelting: Melt semi-steel in an intermediate frequency induction furnace, during which a 50-mesh slagging agent is added for slagging (the slagging agent is made by mixing quartz sand, block lime and fluorite powder in a ratio of 7:2.5:0.5), when When the temperature of the molten steel reaches 1450°C and the scum is white, slag occurs, and then 2.5kg / t yttrium-based heavy rare earth molten steel modifier is added when the steel temperature reaches 1520°C, and when the steel temperature reaches 1540°C, the steel is tapped and blown with argon to shake it to obtain molten steel;

[0038] S3. Pouring: calm the molte...

Embodiment 3

[0041] Embodiment 3, an improved processing technology of semi-steel material seamless steel pipe skew roll, comprising the following steps:

[0042] S1. Determine the chemical composition: the chemical composition of the upper roll 1 and the lower roll 2 is C: 1.60%; Si: 0.75%; Mn: 1.50%; P: 0.030%; S: 0.020%; Ni: 3.50%; Cr : 1.80%; Mo: 0.70%; V: 0.4%;

[0043] S2. Smelting: Melt semi-steel in an intermediate frequency induction furnace, during which a 70-mesh slagging agent is added for slagging (the slagging agent is made by mixing quartz sand, lump lime and fluorite powder in a ratio of 7:2.5:0.5), when When the temperature of the molten steel reaches 1450°C and the scum is white, slag occurs, and then 3kg / t yttrium-based heavy rare earth molten steel modifier is added when the steel temperature reaches 1520°C. ;

[0044] S3. Pouring: calm the molten steel produced in step S2 for 12 minutes, pour it into the roll casting mold when the steel temperature reaches the liquid...

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Abstract

The invention relates to the technical field of rollers, in particular to an improved semi-steel material seamless steel pipe slanting roller and a processing technology thereof. The defect of short service life in the prior art is overcome. The improved semi-steel material seamless steel pipe slanting roller comprises an upper roller and a lower roller, wherein the upper roller and the lower roller are symmetrically arranged and comprise roller bodies; first roller necks and second roller necks are sequentially and fixedly arranged at two ends of the roller bodies; and transmission parts are fixedly arranged at the other ends of the second roller necks. According to the improved semi-steel material seamless steel pipe slanting roller and the processing technology thereof provided by the invention, a way of a traditional production process is changed, modificatory purified molten steel is added in the smelting process, and an electromagnetic vibrator vibrates during pouring, so that the compactness of the molten steel in the solidification process is improved, a microscopic structure is refined, and a structure looseness area in the roller is eliminated; and through multi-stage heat treatment processing, multiple performances of wear resistance, extrusion toughness, strength, plasticity and thermal cracking resistance of the slanting roller are effectively improved, the special operation requirement of slanting rolling can be met, and the service life of the roller is prolonged.

Description

technical field [0001] The invention relates to the technical field of rolls, in particular to an improved semi-steel seamless steel pipe skew roll and its processing technology. Background technique [0002] There are many methods in the production process of hot-rolled seamless steel pipes, especially in the initial rolling stage of billet forming, there are three production processes for forming holes in steel pipes: 1. Pressure punching; 2. Push rolling piercing; cross rolling piercing. The cross-rolling piercing process is to use a pair of rolls with a certain taper to clamp the steel billet between the roll gaps for rolling operation. During the operation, a piercing rod with a pointed cone head is aligned with the center of the billet for extrusion movement. , Roll out the inner hole of the rough steel pipe. Due to the particularity of its rolling operation, the rolls currently used in the market are difficult to meet the requirements in terms of wear resistance, ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C33/04C21D9/38C21C5/54B22D27/08C21D1/28C21D1/18B21B27/02
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C33/04C21D9/38C21C5/54B22D27/08C21D1/28C21D1/18B21B27/025
Inventor 许峰许阿平蒋志芳
Owner 常州市中宇合金轧辊厂
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