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A kind of alloy structural steel 42crmo slab and its production method

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 the effects of uniform and dense solidification structure, shallow vibration marks, and uniform supply

Active Publication Date: 2017-01-11
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of alloy structural steel 42crmo slab and its production method
  • A kind of alloy structural steel 42crmo slab and its production method
  • A kind of alloy structural steel 42crmo slab and its production method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A method for producing alloy structural steel 42CrMo large-section slab, comprising the following steps:

[0034] (1) Adopt the principle of concentrate, molten iron into the furnace: Si: 0.61%, P: 0.080%, S: 0.027%;

[0035] (2) Converter smelting: The top-bottom re-blowing converter is used to realize the primary smelting of molten steel, the slag forming in the early and middle stages to remove P, and the slag production in the middle and late stages to remove S. During the tapping process of the converter, the slag is blocked and the slag is strictly controlled. The thickness of the lower slag is 36mm to prevent phosphorus reversion; during the tapping process, synthetic slag is added to the ladle for slag washing, and the top slag of the ladle is upgraded at the same time to further desulfurize and remove inclusions; high-draw carbon operation and high-draw carbon process are adopted. Reduce post-furnace carbon increase, tapping conditions: C: 0.12%, P: 0.006%; tap...

Embodiment 2

[0057] A method for producing alloy structural steel 42CrMo large-section slab, comprising the following steps

[0058] (1) Adopting the principle of concentrate, molten iron into the furnace: Si: 0.71%, P: 0.090%, S: 0.024%;

[0059] (3) Converter smelting: The top-bottom re-blowing converter is used to realize the primary smelting of molten steel, the slag forming in the early and middle stages is to remove P, and the slag forming in the middle and late stage is used to remove S. 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 the top slag of the ladle is upgraded at the same time to further desulfurize and remove inclusions; high-draw carbon operation and high-draw carbon process are adopted. Reduce post-furnace carbon increase, tapping conditions: C: 0.11%, P: 0.007%; tapping temperature 1662°C;

[0060] (3) LF refining: blow argon after the molten steel enters ...

Embodiment 3

[0081] A method for producing alloy structural steel 42CrMo large-section slab, comprising the following steps:

[0082] (1) Adopting the principle of concentrate, molten iron into the furnace: Si: 0.78%, P: 0.090%, S: 0.026%;

[0083] (2) Converter smelting: The top-bottom re-blowing converter is used to realize the primary smelting of molten steel, the slag forming in the early and middle stages to remove P, and the slag production in the middle and late stages to remove S. During the tapping process of the converter, the slag is blocked and the slag is strictly controlled. The thickness of the lower slag is 38mm to prevent phosphorus reversion; during the tapping process, synthetic slag is added to the ladle for slag washing, and the top slag of the ladle is upgraded at the same time to further desulfurize and remove inclusions; high-draw carbon operation and high-draw carbon process are adopted. Reduce post-furnace carbon increase, tapping conditions: C: 0.11%, P: 0.007%; ...

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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 important parts of various machinery such as large gears for locomotive traction, supercharger transmission gears, rear axles, engine cylinders, drill pipe joints for deep oil wells and salvage tools. It is required to have high mechanical properties. , such as good forging, stamping and cutting performance, but also the ability to withstand the comprehensive action of various loads such as tension, compression, shear, torsion, bending and forging under the conditions of use. As a result, very strict requirements are imposed on the chemical composition, internal and surface quality of the steel in terms of metallurgical quality. [0003] The 42CrMo steel grade belongs to the Cr-Mo steel series in the alloy steel. Th...

Claims

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Application Information

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Patent Type & Authority Patents(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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