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30CrMo steel strip and production method thereof

A production method and technology for steel strips, which are applied in the direction of manufacturing tools, metal rolling, workpiece cooling devices, etc., can solve the problems of affecting the heat treatment process and performance, difficult to control the internal quality of continuous casting billets, and low productivity, etc., to improve the flat coil. Defects, good shape and uniformity of properties, effect of short furnace time

Inactive Publication Date: 2017-12-01
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high strength, toughness, hardenability and good thermal strength of 30CrMo steel, the alloy content is very high, the internal segregation of 30CrMo steel plate / strip continuous casting slab produced by conventional slab continuous casting machine is serious, and the internal quality of continuous casting slab is difficult Control; because the carbon content reaches 0.26-0.34%, the surface decarburization phenomenon will occur if the time in the furnace is too long, which will seriously affect the subsequent heat treatment process and performance, and long-term heating will increase energy consumption and low productivity

Method used

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  • 30CrMo steel strip and production method thereof
  • 30CrMo steel strip and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The thickness of the 30CrMo steel strip product is 2.5mm, and the chemical composition and mass percentage are shown in Table 1.

[0028] The production method includes converter smelting (model 150t), LF refining (model 150t), thin slab continuous casting, heating, hot continuous rolling and coiling processes. The specific production process steps are as follows:

[0029] 1) Converter smelting process: S: 0.020% and P: 0.121% in the molten iron in the converter; use lime and light-burned dolomite to make slag, the amount of lime added is 20kg / ton of steel, and the amount of light-burned dolomite added is 6kg / ton of steel; Add 2.2kg ferromolybdenum to the steel along with scrap steel, add high-carbon ferrochromium after the furnace, the addition amount is 19kg / ton steel, high-carbon ferromanganese addition amount is 4.5kg / ton steel, ferrosilicon addition amount is 2.2kg / ton steel; C: 0.052%, P: 0.017%; the end point temperature is 1637°C, and the end point oxygen level ...

Embodiment 2

[0037] The thickness of the 30CrMo steel strip product is 2.5mm, and the chemical composition and mass percentage are shown in Table 1.

[0038] The production method includes converter smelting (model 150t), LF refining (model 150t), thin slab continuous casting, heating, hot continuous rolling and coiling processes. The specific production process steps are as follows:

[0039] 1) Converter smelting process: S: 0.013% and P: 0.117% in the molten iron in the converter; lime and light-burned dolomite are used to make slag, the amount of lime added is 30kg / ton of steel, and the amount of light-burned dolomite added is 5kg / ton of steel; Add 2.5kg ferromolybdenum to the steel along with scrap steel, add high-carbon ferrochromium after the furnace, the addition amount is 14.5kg / ton steel, high-carbon ferromanganese addition amount is 5kg / ton steel, and ferrosilicon addition amount is 2.5kg / ton steel; C: 0.040%, P: 0.012%; the end point temperature is 1658°C, and the end point oxyg...

Embodiment 3

[0046] The thickness of the 30CrMo steel strip product is 3.0mm, and the chemical composition and mass percentage are shown in Table 1.

[0047] The production method includes converter smelting (model 150t), LF refining (model 150t), thin slab continuous casting, heating, hot continuous rolling and coiling processes. The specific production process steps are as follows:

[0048] 1) Converter smelting process: S: 0.025% and P: 0.130% in the molten iron in the converter; lime and light-burned dolomite are used to make slag, the amount of lime added is 25kg / ton of steel, and the amount of light-burned dolomite added is 3kg / ton of steel; Add 1.5kg ferromolybdenum to the steel along with scrap steel, add high-carbon ferrochromium after the furnace, the addition amount is 14.5kg / ton steel, high-carbon ferromanganese addition amount is 6kg / ton steel, ferrosilicon addition amount is 2kg / ton steel; converter end point C : 0.069%, P: 0.019%; the end point temperature is 1671°C, and the...

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Abstract

The invention discloses a 30CrMo steel strip and a production method thereof. The steel strip comprises the chemical compositions of, by mass, 0.26-0.34% of C, 0.17-0.30% of Si, 0.40-0.70% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, more than or equal to 0.010% of Als, 0.80-1.10% of Cr, 0.15-0.25% of Mo, less than or equal to 0.30% of Ni, less than or equal to 0.30% of Cu, and the balance Fe and unavoidable impurities. The production method comprises the process of converter smelting, LF refining, thin slab continuous casting, heating, hot continuous rolling and coiling. The 30CrMo steel strip and the production method thereof start from the point of full process technology, the center shrinkage, the center segregation and the surface decarburization of the slab are eliminated, and the hot-rolled thin gauge steel strips with the thickness of 2.5-4.0mm are produced, so that the low-cost production of 30CrMo steel strip is realized.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a 30CrMo steel strip and a production method thereof. Background technique [0002] At present, the production process of 30CrMo steel plate / strip is mainly: converter or electric furnace → refining → conventional slab continuous casting → walking heating furnace → rolling mill → coiling. Due to the high strength, toughness, hardenability and good thermal strength of 30CrMo steel, the alloy content is very high, the internal segregation of 30CrMo steel plate / strip continuous casting slab produced by conventional slab continuous casting machine is serious, and the internal quality of continuous casting slab is difficult Control; because the carbon content reaches 0.26-0.34%, the surface decarburization phenomenon will occur if the time in the furnace is too long, which will seriously affect the subsequent heat treatment process and performance, and long...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/42C22C38/22C22C38/20C22C38/02C22C38/04C22C38/06C22C33/04C21C7/068B21B1/26B21B37/74B21B37/58B21B45/02
CPCB21B1/26B21B37/58B21B37/74B21B45/0203C21C7/068C22C33/04C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/42C22C38/44
Inventor 侯明山李秀景张垚魏升辉张星梅淑文王彬殷楷汪云辉
Owner TANGSHAN IRON & STEEL GROUP
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