Nodular cast iron roller of hot rolled seamless steel tube tandem mill and preparation method thereof

A technology of seamless steel pipe and ductile iron, which is applied in the field of roll manufacturing, and can solve problems such as difficulty in austempering and cracking

Active Publication Date: 2012-01-25
SHANDONG SIFANG STEEL PIPE EQUIP MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts a special casting method to increase the spheroidization rate and spheroidization level, adopts austempering heat treatment to improve the comprehensive performance of the roll, solves the problem of thick and large nodular cast iron casting and isothermal quenching, and produces hot-rolled no The ductile cast iron rolls of seam steel pipe continuous rolling mills can avoid the rolls from breaking during use, reduce manufacturing and use costs, and reduce the consumption of precious metals nickel, chromium, molybdenum and energy

Method used

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  • Nodular cast iron roller of hot rolled seamless steel tube tandem mill and preparation method thereof
  • Nodular cast iron roller of hot rolled seamless steel tube tandem mill and preparation method thereof

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preparation example Construction

[0021] The preparation method of the hot-rolled seamless steel pipe continuous rolling mill nodular cast iron roll of the present invention has the following steps:

[0022] Mold design: According to the structural shape of the roll, choose a circular cross-section variable-diameter type or a round cross-section nearly equal-thickness pure sand or composite sand mold; the mold runner is an independent runner. The round section of the mold is made of a round sand box instead of the traditional square sand box, so that the thickness of the sand mold in each part is the same, and the cooling conditions are consistent.

[0023] The diameter-reducing type of round section of the casting mold is to divide the sand mold into three parts according to the shape of the continuous rolling roll: the upper short axis, the middle roll ring and the lower long axis. The diameter of each part of the round sand box is determined according to the diameter of the continuous rolling roll. The overa...

Embodiment 1

[0030] Embodiment 1 is to manufacture Φ460 hot-rolled seamless steel pipe continuous rolling mill rolls, and the chemical composition of the rolls is shown in Table 1 by weight percentage (%Wt).

[0031] Table 1

[0032] C

Si

mn

Cu

Mo

Ti

Al

Bi

Mg

P

S

3.2

2.3

0.20

0.23

0.22

0.05

0.02

0.002

0.05

0.03

0.02

[0033] The balance is Fe.

[0034] refer to figure 1 , the upper short axis diameter of the roll is Φ300mm, the shaft length is 147mm, the middle roll ring diameter is Φ803.9mm, the scrapped diameter is Φ740mm, the roll ring thickness is 320mm, the lower long axis diameter is Φ280-300mm, the shaft length is 700mm, and the weight of the finished product is 1310kg / piece.

[0035] Process requirements: tensile strength ≥ 800MPa, hardness 270-330HB, hardness should be ≥ 270HB when it is scrapped.

[0036] The casting ...

Embodiment 2

[0043] Example 2 is to manufacture Φ180 hot-rolled seamless steel pipe continuous rolling mill rolls, and the chemical composition of the rolls is shown in Table 2 by weight percentage (%Wt).

[0044] Table 2

[0045]

C

Si

mn

Cu

Mo

Ti

Al

Bi

Mg

P

S

3.6

2.61

0.20

0.39

0.30

0.07

0.04

0.003

0.04

0.03

0.02

[0046] The balance is Fe.

[0047] refer to figure 1 , the diameter of the upper short axis of the roll is Φ275mm, the shaft length is 140mm, the diameter of the middle roll ring is Φ623.1mm, the diameter when scrapped is Φ573mm, the thickness of the roll ring is 220mm, the diameter of the lower long axis is Φ260-275mm, the shaft length is 500mm, and the weight of the finished product is 623kg / piece.

[0048] Process requirements: the tensile strength is ≥850MPa, the hardness is 420-450HB, an...

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Abstract

The invention discloses a nodular cast iron roller of a hot rolled seamless steel tube tandem mill and a preparation method thereof. The method comprises the following steps of: according to the structural shape of the roller, selecting a composite sand mold, the circular sections of which have nearly equal thickness; selecting a raw material with low alloy content for smelting; controlling the casting solidification time within 2 hours; performing isothermal quenching on a roller casting blank; and finally, performing finish machining and inspection on the roller. The invention simultaneously provides the nickel-free and chromium-free nodular cast iron roller of the hot rolled seamless steel tube tandem mill, designed by using low-molybdenum alloy reduced components. By the method, the nodular cast iron roller of the hot rolled seamless steel tube tandem mill, satisfying the service condition, is manufactured; the roller is prevented from cracking in use; consumption of noble metals such as nickel, chromium and molybdenum and energy is reduced; and the manufacturing and using costs of an enterprise are reduced.

Description

technical field [0001] The invention relates to the technical field of roll manufacturing, in particular to a nodular cast iron roll of a hot-rolled seamless steel pipe continuous rolling mill and a preparation method thereof. Background technique [0002] In recent years, my country has introduced and built a large number of advanced steel pipe production units, and has all the advanced pipe rolling mill models and large-scale units in the world, many of which are world's first. my country has become the largest producer and consumer of steel pipes in the world, and the consumption of steel pipe rolls is the largest in the world. Advanced steel pipe production units and the production of high-grade alloy steel pipes put forward higher requirements for rolls. [0003] The service conditions of the hot-rolled seamless steel pipe tandem rolling mill are harsh, and the working temperature is generally 1120-1200°C. When the working temperature is lower than 1100°C, the roll an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C33/08B22C9/28C21D5/00C21D9/38B21B27/00
Inventor 袁厚之张凝刘行一王平
Owner SHANDONG SIFANG STEEL PIPE EQUIP MFG
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