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Alloy structure steel 42CrMo slab and production method thereof

A technology of alloy structural steel and production method, which is applied in the field of converter metallurgy, can solve the problems of 42CrMo steel large-section slab production and development that have not been reported, and achieve uniform and compact solidification structure, reduce center porosity, and reduce inclusion content.

Active Publication Date: 2015-06-10
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the production and development of 42CrMo steel large-section slabs

Method used

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  • Alloy structure steel 42CrMo slab and production method thereof
  • Alloy structure steel 42CrMo slab and production method thereof
  • Alloy structure steel 42CrMo slab and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for producing an alloy structural steel 42CrMo large-section slab, comprising the steps of:

[0033] (1) Adopt the principle of fine material, molten iron into furnace: Si: 0.61%, P: 0.080%, S: 0.027%;

[0034] (2) Converter smelting: The primary smelting of molten steel is achieved by using a top-bottom combined blowing converter. The slag is formed to remove P in the early and middle stages, and the S is removed in the middle and late stage. The thickness of the lower slag is 36mm to prevent phosphorus return; during the tapping process, synthetic slag is added to the ladle for slag washing, and at the same time, the top slag of the ladle is modified to further desulfurize and remove inclusions; the high-drawing carbon operation is adopted, and the high-drawing carbon process is adopted. Reduce post-furnace carburization, tapping conditions: C: 0.12%, P: 0.006%; tapping temperature 1665°C;

[0035] (3) LF refining: Argon is blown after the molten steel enter...

Embodiment 2

[0056] A method for producing an alloy structural steel 42CrMo large-section slab, comprising the following steps

[0057] (1) Adopt the principle of fine material, molten iron into furnace: Si: 0.71%, P: 0.090%, S: 0.024%;

[0058] (3) Converter smelting: The primary smelting of molten steel is achieved by using a top-bottom combined blowing converter. The slag is formed to remove P in the early and middle stages, and the S is removed in the middle and late stage. The thickness of the lower slag is 39mm to prevent phosphorus reversion; during the tapping process, synthetic slag is added to the ladle for slag washing, and at the same time, the top slag of the ladle is modified to further desulfurize and remove inclusions; the high-drawing carbon operation is adopted, and the high-drawing carbon process is adopted. Reduce post-furnace carburization, tapping conditions: C: 0.11%, P: 0.007%; tapping temperature 1662°C;

[0059] (3) LF refining: Argon is blown after the molten st...

Embodiment 3

[0080] A method for producing an alloy structural steel 42CrMo large-section slab, comprising the steps of:

[0081] (1) Adopt the principle of fine material, molten iron into furnace: Si: 0.78%, P: 0.090%, S: 0.026%;

[0082] (2) Converter smelting: The primary smelting of molten steel is achieved by using a top-bottom combined blowing converter. The slag is formed to remove P in the early and middle stages, and the S is removed in the middle and late stage. The thickness of the lower slag is 38mm to prevent phosphorus return; during the tapping process, synthetic slag is added to the ladle for slag washing, and at the same time, the top slag of the ladle is modified to further desulfurize and remove inclusions; the high-drawing carbon operation is adopted, and the high-drawing carbon process is adopted. Reduce post-furnace carburization, tapping conditions: C: 0.11%, P: 0.007%; tapping temperature 1676°C;

[0083] (3) LF refining: Argon is blown after the molten steel enter...

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Abstract

The invention relates to an alloy structure steel 42CrMo slab and a production method thereof. The method comprises the following steps: (1) charging molten iron containing less than or equal to 0.030% of S, less than or equal to 0.120% of P and less than or equal to 0.85% of Si into a furnace; (2) smelting steel rods containing more than or equal to 0.10% of C and less than or equal to 0.008% of P in the converter at the temperature of 1650-1680 DEG C; (3) performing LF (low frequency) refining and adjusting the target values of the components, so that C is 0.41-0.43% of C, Si is 0.23-0.27%, Mn is 0.58-0.62%, S is less than or equal to 0.010%, P is less than or equal to 0.015%, Cr is 0.92-0.98%, Mo is 0.17-0.19%, Cu is less than or equal to 0.20% of Cu and Ni is less than or equal to 0.30%, wherein the discharge temperature of molten steel is 1560+45 DEG C in a first furnace and 1550+45 DEG C in a continuous casting furnace; (4) performing VD (vacuum degassing) refining under the vacuum of less than or equal to 67Pa for 15 minutes, meanwhile, performing weak argon blowing stirring of 0.15-0.20MPa, feeding 140-150m of CaSi wire with the diameter of phi13mm after breaking, and then performing weak argon blowing for more than or equal to 10 minutes, wherein the discharge temperature is 1560+ / -5 DEG C in the first furnace and 1550+ / -5 DEG C in the continuous casting furnace; and (5) performing continuous casting: controlling the water distribution of each secondary cooling zone of a slab caster by adopting a primary water meter, wherein the light pressing interval fs is 0.45-0.95, the distribution coefficients are shown in table 2, and the pressing quantity is 3.8mm. The method meets the production requirements of large-section 42CrMo slabs.

Description

technical field [0001] The invention belongs to the field of converter metallurgy, and particularly provides an alloy structural steel 42CrMo slab and a production method thereof. Background technique [0002] 42CrMo alloy structural steel is mainly used to make locomotive traction gears, supercharger transmission gears, rear axles, engine cylinders, oil deep well drill pipe joints and fishing tools and other important parts of machinery, which require high mechanical properties , such as good forging, stamping and cutting performance, but also the ability to withstand the combined effects of various loads such as tension, compression, shear, torsion, bending and forging under service conditions. Therefore, in terms of metallurgical quality, very strict requirements are placed on the chemical composition, internal and surface quality of the steel. [0003] 42CrMo steel belongs to the Cr-Mo steel series in alloy steel. The GBT3077-1999 alloy structural steel standard specifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44B22D11/18
Inventor 王智轶李炳一马立军王朝阳
Owner TIANJIN IRON & STEEL GRP
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