Medium carbon free-cutting non-quenched-and-tempered steel containing sulfur and tellurium and production technological method thereof

A technology of non-quenched and tempered steel and production process, applied in the fields of non-quenched and tempered steel and its production process, medium carbon non-quenched and tempered steel and its production process, can solve the problem of unsatisfactory performance of free-cutting non-quenched and tempered steel and easy casting billet. Slag sticking and cracking, unable to meet the material machinability requirements of the manufacturing industry, etc.

Active Publication Date: 2017-10-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The difficulty in the production process of free-cutting non-quenched and tempered steel is that during the continuous casting of sulfur-containing steel, the slab tends to stick to slag and crack, and it is easy to block the nozzle during

Method used

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  • Medium carbon free-cutting non-quenched-and-tempered steel containing sulfur and tellurium and production technological method thereof
  • Medium carbon free-cutting non-quenched-and-tempered steel containing sulfur and tellurium and production technological method thereof
  • Medium carbon free-cutting non-quenched-and-tempered steel containing sulfur and tellurium and production technological method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In this embodiment, a medium-carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium has the main element composition and element weight percentage (wt%) as shown in the following table:

[0051] Table 1. Chemical composition control table of medium carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium in Example 1 (weight, %)

[0052] Element

C

Si

mn

P

S

Te

Mo

Nb

V

N

Ca

content / %

0.38

0.58

1.42

0.01

0.002

0.05

0.04

0.015

0.10

0.015

0.0015

[0053]In this example, the medium-carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium except the main elements in Table 1, the rest is iron and unavoidable impurities, wherein the weight ratio of tellurium / sulfur is 2.5:1.

[0054] The production process method of medium-carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium...

Embodiment 2

[0076] This embodiment is basically the same as Embodiment 1, especially in that:

[0077] In this embodiment, a medium-carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium has the main element composition and element weight percentage (wt%) as shown in the following table:

[0078] Table 3. Chemical composition control table of medium-carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium in Example 2 (weight, %)

[0079] Element

C

Si

mn

P

S

Te

Mo

Nb

V

N

Ca

content / %

0.49

0.64

1.38

0.02

0.06

0.03

0.02

0.018

0.08

0.014

0.002

[0080] In this example, the medium-carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium, in addition to the main elements in Table 3, the balance is iron and unavoidable impurities, wherein the weight ratio of tellurium / sulfur is 0.5:1.

[0081] The production process meth...

Embodiment 3

[0089] This embodiment is basically the same as the previous embodiment, and the special features are:

[0090] In this embodiment, a medium-carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium has the main element composition and element weight percentage (wt%) as shown in the following table:

[0091] Table 4. Chemical composition control table of medium-carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium in Example 3 (weight, %)

[0092] Element

C

Si

mn

P

S

Te

V

N

Ca

content / %

0.35

0.10

0.75

0.03

0.02

0.02

0.02

0.012

0.001

[0093] In this example, the medium-carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium except the main elements in Table 4, the rest is iron and unavoidable impurities, wherein the weight ratio of tellurium / sulfur is 1:1.

[0094] The production process of medium-carbon free-cuttin...

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Abstract

The invention discloses medium carbon free-cutting non-quenched-and-tempered steel containing sulfur and tellurium and a production technological method thereof. The non-quenched-and-tempered steel mainly comprises 0.35%-0.50% of C, 0.10%-0.80% of Si, 0.75%-1.60% of Mn, 0-0.03% of P, 0.02%-0.08% of S, 0-0.08% of Mo, 0-0.025% of Nb, 0.02%-0.12% of V, 0.012%-0.016% of N, 0.02%-0.08% of Te, 0.001%-0.003% of Ca, and the balance Fe and inevitable impurities. The ratio of the tellurium to the sulfur is 0.25-2.5. According to the free-cutting non-quenched-and-tempered steel disclosed by the invention, occluded foreign substances in the steel can be subjected to modifying treatment by adding the tellurium, the cutting properties, fatigue resistance and the like of the non-quenched-and-tempered steel can be improved obviously, and pollution to the environment can be avoided.

Description

technical field [0001] The invention relates to a non-quenched and tempered steel and a production process thereof, in particular to a medium-carbon non-quenched and tempered steel and a production process thereof, which are applied in the technical field of iron and steel metallurgy. Background technique [0002] Non-quenched and tempered steel came into being under the background of the oil crisis in the 1970s. It canceled the quenched and tempered heat treatment by means of microalloying, controlled rolling and controlled cooling, and reached or approached the mechanical properties of quenched and tempered steel. A high-efficiency energy-saving steel. Since German Thyssen Company developed 49MnVS3 and applied it to automobile crankshafts, non-quenched and tempered steel has met the requirements of clean and reliable materials proposed by contemporary society by virtue of its advantages of no quenching and tempering, saving equipment investment, reducing production process...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C38/12C22C33/04C21C7/10C21C7/06C21C7/00C21D8/00C21D1/26
CPCC21C7/0006C21C7/06C21C7/10C21D1/26C21D8/005C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/12C22C38/60Y02P10/20
Inventor 付建勋成娟王阳沈平杨乾坤付文笙张东李健胡德林
Owner SHANGHAI UNIV
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