ASTM4130 steel and production method thereof

A production method and technology of refining slag, which are applied in the field of metal materials and steelmaking, can solve the problems of high steel plate strength, high Al element content, unfavorable cold working safety, etc., and achieve the effect of easy deformation and low elongation

Active Publication Date: 2022-06-21
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent document, a high-strength 30CrMo plus B steel can be obtained after heat treatment. The elongation of the patented steel plate is controlled at 14%-17%, and the elongation is acceptable, but the silicon content in this patent is too high, which is not conducive to follow-up cold processing and its safety; and the composition design of this patent document has a high Al element content, which is not conducive to the subsequent use as a cold-drawn material, and the strength of the steel plate after heat treatment is high, which is also not conducive to the subsequent use as a cold-drawn material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The chemical composition weight percentage of the steel plate is shown in Table 1 below, and the finished product is rolled with a thickness of 3 mm.

[0026] The production process is as follows: molten iron pretreatment - converter top and bottom blowing smelting - LF refining outside the furnace - RH vacuum treatment - slab continuous casting - slab heating (slab heating) - rolling - laminar cooling - coil Take - thermal insulation cover to cool slowly;

[0027] The specific process parameters of each process are controlled as follows:

[0028] After molten iron pretreatment, S is 0.06%, molten iron temperature is 1338℃; converter tapping temperature is 1665℃;

[0029] The refining components outside the LF furnace are controlled as: C: 0.26%, Si: 0.16%, Mn: 0.36%, Cr: 0.79%, Al<0.005%, O: 0.0015%, P: 0.013%, S: 0.008%, refining slag The alkalinity is 2.4, and the aluminum-free deoxidation process is adopted;

[0030] After the RH vacuum treatment, adjust the argo...

Embodiment 2

[0039] The chemical composition weight percentage of the steel plate is shown in Table 1 below, and the finished product is rolled with a thickness of 3.5 mm.

[0040] The production process is as follows: molten iron pretreatment - top and bottom blowing smelting in converter - LF refining outside furnace - RH vacuum treatment - slab continuous casting - slab heating by direct loading - rolling - laminar cooling - coiling - slow cooling with thermal insulation cover .

[0041] The specific process parameters of each process are controlled as follows:

[0042] S: 0.04% after molten iron pretreatment, molten iron temperature 1343℃; converter tapping temperature 1667℃;

[0043] The refining components outside the LF furnace are controlled as follows: C: 0.27%, Si: 0.14%, Mn: 0.37%, Cr: 0.79%, Al<0.005%, O: 0.0019%, P: 0.011%, S: 0.005%, refining slag The alkalinity is 2.6, and the aluminum-free deoxidation process is adopted;

[0044] After the RH vacuum treatment, adjust the...

Embodiment 3

[0053] The chemical composition weight percentage of the steel plate is shown in Table 1 below, and the finished product is rolled with a thickness of 3.5 mm.

[0054] The production process is as follows: molten iron pretreatment - top and bottom blowing smelting in converter - LF refining outside furnace - RH vacuum treatment - slab continuous casting - slab heating by direct loading - rolling - laminar cooling - coiling - slow cooling with thermal insulation cover .

[0055] The specific process parameters of each process are controlled as follows:

[0056] S: 0.05% after molten iron pretreatment, molten iron temperature 1340℃; converter tapping temperature 1660℃;

[0057] The refining components outside the LF furnace are controlled as: C: 0.26%, Si: 0.15%, Mn: 0.38%, Cr: 0.75%, Al<0.005%, O: 0.0019%, P: 0.014%, S: 0.005%, refining slag The alkalinity is 1.7, and the aluminum-free deoxidation process is adopted;

[0058] After the RH vacuum treatment, adjust the flow of...

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Abstract

The invention discloses ASTM4130 steel and a production method thereof. The disclosed ASTM4130 steel comprises the following chemical components in percentage by mass: 0.28-0.33% of C, 0.17-0.30% of Si, 0.45-0.60% of Mn, 0.85-1.05% of Cr, 1t of Al, 0.20-0.30% of Cr, 0.20-0.30% of Mo, 0.20-0.30% of Mo, 0.20-0.30% of Mo, 0.20-0.30% of Mo, 0.20- The steel comprises the following components in percentage by weight: 0.01% of Fe, less than or equal to 0.0015% of O, less than or equal to 0.020% of P, less than or equal to 0.012% of According to the disclosed production method, a low-alkalinity refining slag system and an aluminum-free deoxidation process are adopted in the LF external refining process, the alkalinity of refining slag does not exceed 3.0, and the ASTM4130 steel with the tensile strength larger than or equal to 760 MPa and the ductility A larger than or equal to 17.5% is finally produced and obtained and can be used as a cold-drawn material subsequently.

Description

technical field [0001] The invention belongs to the technical field of metal materials produced in the metallurgical industry and steelmaking, in particular to a kind of ASTM4130 steel and a production method thereof, in particular to a method for producing ASTM4130 steel by adopting aluminum-free deoxidation technology and a low-basicity refining slag system and the production method thereof The aluminum-free (substantially free of aluminum, Al<0.01%) ASTM4130 steel. Background technique [0002] ASTM4130 steel is a good raw material for cold drawn material and is widely used for its excellent mechanical properties. For example, patent document CN107419192A discloses a 30CrMo steel strip and a production method thereof. The chemical composition and mass percentage of the steel sheet in the steel design are: the chemical composition and mass percentage of the steel strip are: C: 0.26-0.34%, Si: 0.17-0.30%, Mn: 0.45-0.70%, P≤0.025%, S≤0.025%, Als≥0.010%, Cr:0.80-1.10%, Mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C33/04C21C7/06C21C7/00C21C7/076C21C7/10B21B1/46
CPCC22C38/02C22C38/04C22C38/18C22C33/04C21C7/06C21C7/0075C21C7/076C21C7/10B21B1/463Y02P10/20
Inventor 李峰王婷敬鑫岳祎楠
Owner BAOTOU IRON & STEEL GRP
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