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Steel pipe reducing machine or sizing machine ductile iron roll and preparation method thereof

The technology of ductile iron and diameter reducing machine is applied in the field of roll casting, which can solve the problem of large waste of metal materials, and achieve the effects of reducing manufacturing and use costs, reducing the content of nickel alloy components, and reducing use and consumption.

Active Publication Date: 2011-12-07
SHANDONG PROVINCE SIFANG TECHN DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above usage shows that the waste of metal materials, especially the precious metal nickel and energy is great

Method used

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  • Steel pipe reducing machine or sizing machine ductile iron roll and preparation method thereof
  • Steel pipe reducing machine or sizing machine ductile iron roll and preparation method thereof
  • Steel pipe reducing machine or sizing machine ductile iron roll and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 is to manufacture nodular cast iron rolls for hot-rolled seamless steel tube sizing mills for Φ250 seamless steel tube continuous rolling mills. The components of the rolls are shown in Table 1 by weight percentage (%Wt).

[0023] Table 1

[0024] C

Si

mn

Cu

Cr

Mo

Nb

Ti

Al

Mg

P

S

3.6

2.3

0.2

0.4

0.3

0.2

0.08

0.05

0.02

0.04

0.03

0.02

[0025] The rest is Fe.

[0026]Select the ratio of raw materials according to the components listed in Table 1, smelt to obtain molten steel with the required composition, add yttrium-based heavy rare earth spheroidizer for centrifugal casting, and obtain the roll casting slab of the required specification, and then rough process the roll casting slab , heat the roll to 880°C and keep it warm for 2 hours; then put the roll into a bath salt furnace with a temperature of 275±10°C for 15mi...

Embodiment 2

[0028] Example 2 is to manufacture Φ508 seamless steel pipe circumferential rolling mill hot-rolled seamless steel pipe sizing machine nodular cast iron rolls, the roll components are shown in Table 2 by weight percentage (%Wt).

[0029] Table 2

[0030]

C

Si

mn

Cu

Cr

Mo

Nb

Ti

Al

Mg

P

S

3.8

2.5

0.3

0.6

0.4

0.4

0.12

0.08

0.05

0.06

0.04

0.015

[0031] The rest is Fe.

[0032] Select the ratio of raw materials according to the components listed in Table 2, smelt to obtain molten steel with the required composition, add yttrium-based heavy rare earth nodulizers for centrifugal casting, and obtain roll billets of required specifications, and then rough-process the roll billets , heat the roll to 890°C and keep it warm for 3 hours; then put the roll into a bath salt furnace with a te...

Embodiment 3

[0034] Example 3 is to manufacture nodular cast iron rolls for hot-rolled seamless steel tube sizing mills for Φ720 seamless steel tube continuous rolling mills. The roll components are shown in Table 3 by weight percentage (%Wt).

[0035] table 3

[0036] C

Si

mn

Cu

Cr

Mo

Nb

Ti

Al

Mg

P

S

4.0

2.7

0.35

0.5

0.5

0.3

0.05

0.03

0.03

0.05

0.036

0.01

[0037] The rest is Fe.

[0038] Select the ratio of raw materials according to the components listed in Table 3, smelt to obtain molten steel with the required composition, add yttrium-based heavy rare earth nodulizers for centrifugal casting, and obtain roll billets of required specifications, and then rough-process the roll billets , heat the roll to 860°C and keep it warm for 1 hour; then put the roll into a bath salt furnace with a temperature of 270±10°C for 15min isothermal quenching, a...

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Abstract

The invention discloses a steel pipe reducing mill or sizing mill nodular cast iron roller and a preparation method thereof. According to the invention, better mechanical properties than the conventional heat treated nodular cast iron roller are obtained by adopting a reasonable component ratio and a nickel free scheme, reducing component compositions of other alloy contents in the nodular cast iron roller and carrying out isothermal quenching by adopting a two-step method, so that the strength and the toughness of the nodular cast iron roller are greatly increased; the wear resistance of thenodular cast iron roller achieves the level of the traditional high-nickel sizing and reducing the alloy nodular cast iron roller through laboratory experiments and installation use; and the actual needs of production are met. The use and consumption of precious metals are reduced and the costs of manufacture and use are minimized.

Description

technical field [0001] The invention relates to the technical field of roll casting, in particular to a nodular cast iron roll of a seamless steel pipe reducing machine or a sizing machine and a preparation method thereof. Background technique [0002] The reducing or sizing process of the seamless steel pipe is a multi-stand continuous rolling process of the steel pipe without a mandrel. The sizing is to complete the rolling of the precision of the steel pipe size and the true roundness. In addition to the sizing task, the sizing requires a large reduction rate to realize the production of small-diameter steel pipes from large pipe materials. The reducing and sizing machine is generally a two-roll or three-roll type with 3 to 24 racks, and the size of the steel pipe after reducing and sizing will not change. At present, domestic advanced units are all three-rollers. [0003] The reducing and sizing rolls of seamless steel pipes are subjected to the combined stress of tang...

Claims

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Application Information

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IPC IPC(8): C22C37/10C21D9/38C21D1/20
Inventor 袁厚之张凝刘行一王平
Owner SHANDONG PROVINCE SIFANG TECHN DEV
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