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Forging steel

A forging and forging technology, applied in the field of forging steel, can solve the problems of reducing hot forging, difficult to reflect the dimensional accuracy of forged parts, and small load load.

Inactive Publication Date: 2009-09-23
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hot forging is forged in a temperature zone where the deformation resistance of steel is low, so the load on the forging machine is small, but there is a disadvantage that a large amount of scale is attached to the steel, and it is difficult to reflect the dimensional accuracy of forged parts
Warm forging can reduce the disadvantages of hot forging. It has less scale and is also beneficial in terms of dimensional accuracy, but it has the disadvantage of higher deformation resistance than hot forging.
Cold forging has the advantages of no scale and good dimensional accuracy, but it also has the disadvantage of high forging load

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0190] First, an example of cold forging will be described. The steels with the chemical compositions shown in Table 1 were melted, and the slabs rolled by the slab were heated to 1150° C., hot-rolled, and completed at 930° C. to produce steel bars of 50 mmΦ.

[0191] Table 1

[0192] Composition of steel (mass%)

[0193] serial number

C

Si

mn

P

S

Cr

Mo

Ni

Cu

Al

N

BL value

B

Ti

Nb

V

other elements

Di value

differentiate

1

0.200

0.25

0.65

0.013

0.011

0.92

-

-

-

0.033

0.013

-

-

-

-

-

-

60

comparative example

2

0.202

0.25

0.75

0.018

0.020

0.55

0.21

0.55

-

0.032

0.012

-

-

-

-

-

-

95

comparative example

3

0.199

0.27

0....

Embodiment 2

[0209] Next, examples of warm forging and hot forging will be described. The steels with the chemical compositions shown in Table 3 were melted, and the slabs obtained by the slab rolling were heated to 1150° C., hot-rolled, and completed at 930° C. to produce steel bars of 50 Φ.

[0210] table 3

[0211]

[0212] Cylindrical test pieces with a length of 8 mmΦ×12 mm were produced by cutting and grinding from the steel bar described above, and a compression test was performed at the temperature shown in Table 4 at a strain rate of 10 / sec. We investigated the maximum deformation stress up to equivalent strain 0.5.

[0213] Moreover, a cylindrical test piece with a length of 17.5mmΦ×52.5mm is made from the above-mentioned bar steel by cutting and grinding, and gas carburizing and quenching, vacuum carburizing and quenching, or carburizing and nitriding quenching are carried out. After that, heat treatment of high-frequency heating, quenching and tempering is combined. Here,...

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Abstract

Disclosed is a forging steel having excellent cool and hot forging properties. The forging steel comprises the following components (by mass): C: not less than 0.001% and less than 0.07%; Si: 3.0% or less; Mn: 0.01-4.0%; Cr: 5.0% or less; P: 0.2% or less; S: 0.35% or less; Al: 0.0001-2.0%; N: 0.03% or less; and one or two components selected from 0.5% or less (including 0%) of Mo and 4.5% or less (including 0%) of Ni, with the remainder being iron and unavoidable impurities, and has a Di value as calculated in accordance with the following formula (1) of 60 or greater. Di = 5.41*Di(Si)*Di(Mn)*Di(Cr)*Di(Mo)*Di(Al) ...(1).

Description

technical field [0001] The present invention relates to forging steel subjected to various machining processes through a forging process. Background technique [0002] The steel used for a machine structure generally uses the steel material which added Mn or Cr, or added Cr and Mo, or combined these and added Ni etc. further. These steel materials produced by casting and rolling are subjected to machining and heat treatment such as forging and cutting to become steel parts. [0003] However, the forging process accounts for a relatively high proportion of labor and cost in producing steel parts, and reducing this is an important issue. Therefore, it is necessary to improve the capability of the manufacturing process to increase the die life in the forging process and to reduce the number of forgings. Hot forging is forged in a temperature range where the deformation resistance of steel is low, so the load on the forging machine is small, but there is a disadvantage that a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/18C22C38/60C21D1/06
Inventor 斋藤肇越智达朗桥村雅之
Owner NIPPON STEEL CORP