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Large-specification steel rod diameter fixing hole pattern and diameter fixing process

A technology with large size and sizing holes, applied in the field of steel rolling in the metallurgical industry, can solve the problems of low dimensional accuracy, low material utilization rate, high cost of round steel, etc., achieving less heating times, favorable rolling stability, and rolling The effect of short production time

Inactive Publication Date: 2013-02-27
YANGZHOU CHENGDE HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the round steel obtained by forging is expensive and has low dimensional accuracy. It needs to be machined, and the material utilization rate is low. It is often used in occasions with high requirements.

Method used

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  • Large-specification steel rod diameter fixing hole pattern and diameter fixing process
  • Large-specification steel rod diameter fixing hole pattern and diameter fixing process

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Embodiment 1

[0017] Embodiment 1: This embodiment describes the roll design and sizing process for producing super large-diameter round steel with a steel grade of 20G and a finished product diameter of Φ1000mm (the thermal dimension is Φ1015mm).

[0018] In this embodiment, the diameter of the roll used is 1500mm, the rotation speed is 10-20rpm, and the roll gap is 565-455mm. The pass system see attached figure 1 , where: the main arc radius R = 515mm; the transition arc radius R1 = 150mm; the total height of the pass H0 = 1015mm; the main arc central angle a = 100 °.

[0019] The sizing process described in this embodiment is: select an octagonal prism-shaped steel billet with an inscribed circle D=1200mm (the thermal dimension is D=1215mm) as a raw material, and refer to the appendix for the sizing process. figure 2 ,mainly include:

[0020] The first step is to roll the steel billet with a rolling temperature of about 1150°C, with a reduction of ≤50mm / pass, and roll back and forth f...

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Abstract

The invention discloses a large-specification steel rod diameter fixing hole pattern and a diameter fixing process. The height H0 of the diameter fixing hole pattern is D, the radius R of a main circular arc is 0.5D, the centre angle a of the main circular arc is 100 DEG, and the radius R1 of a transitional circular arc is 0.15D, wherein D is the hot diameter of a finished steel rod. In the diameter fixing process comprises, an octagonal ingot of which the diameter H2 of an inscribed circle of the cross section is equal to D+160 to 200 millimeters is selected as a raw material, wherein D is the hot diameter of the finished steel rod and; and the diameter fixing hole pattern is used for rolling diameter fixing. The process comprises the following process steps: rolling an eight-edge-prism-shaped steel blank reciprocally for four times till the height H1 of the finished product, wherein the rolling reduction per time is less than or equal to 50 millimeters; and turning the blank rolled in by the first step at 90 DEG, feeding the blank to rollers, rolling reciprocally for 4 times, and obtaining a finished product, wherein the rolling reduction per time is less than or equal to 40 millimeters. The process has the advantages that: the total rolling times are reduced; the rolling time is short; forming can be accomplished with one time of heating; and the rolling is stable.

Description

technical field [0001] The invention relates to a large-size round steel sizing pass and a sizing process, and belongs to the technical field of steel rolling in the metallurgical industry. Background technique [0002] The production level of large-diameter high-alloy seamless steel pipe is an important indicator to measure the overall production level of a country's steel industry. The quality and price of large-diameter round steel, the raw material required for the production of large-diameter high-alloy seamless steel pipe, is a constraint One of the important factors in the production level of large-diameter high-alloy seamless steel pipes. At present, due to various reasons, high-quality and cheap large-diameter round steel cannot be provided in China. [0003] The way to obtain large-diameter round steel in my country is mainly casting and forging. At present, the largest size of domestic continuous casting billet is Φ800mm round steel, and the casting production of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B27/02B21B1/08
Inventor 徐国荣仇志定
Owner YANGZHOU CHENGDE HEAVY IND CO LTD
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