Method for producing 30CrMo hot rolled steel plate

A technology of hot-rolled steel sheet and production method, which is applied to metal rolling and other directions, can solve the problems of surface decarburization, high temperature and high production cost of casting billet, and achieve the effect of guaranteeing yield strength, reducing production cost and guaranteeing tensile strength.

Inactive Publication Date: 2010-07-14
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Usually 30CrMo hot-rolled steel plate is produced by the traditional process, and there are the following main problems: due to the high carbon content of 30CrMo, complex alloy composition, low casting speed of thick slab continuous caster, and slow solidification of molten steel, it is easy to cause slab composition segregation and loosening, It leads to uneven microstructure and properties of the final product; using a walking heating furnace to heat the slab, the heating time is long, the temperature is high, and the surf

Method used

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  • Method for producing 30CrMo hot rolled steel plate
  • Method for producing 30CrMo hot rolled steel plate
  • Method for producing 30CrMo hot rolled steel plate

Examples

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Effect test

Embodiment 1

[0028] The production method of 30CrMo hot-rolled thin plate described in this embodiment, the process flow of the method: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar cooling , coiling.

[0029] The chemical composition of molten steel after refining is: C: 0.30wt.%, Si: 0.25wt.%, Mn: 0.60wt.%, P 0.020wt.%, S 0.005wt.%, Cr: 0.80wt.%, Mo: 0.18wt.%, the rest is Fe and unavoidable impurities.

[0030] Process parameters of thin slab continuous casting and rolling process: slab entering furnace temperature T 入 is 1050°C, the superheat of molten steel T 过 40°C, finishing temperature T 终 930°C, coiling temperature T 卷 570℃, continuous casting casting speed S 拉 is 5.5m / min, the continuous casting liquid core is pressed down L 压 is 5mm.

[0031] The physical and chemical performance indicators of the mold flux used: the melting point is 960°C, ...

Embodiment 2

[0036] The production method of 30CrMo hot-rolled thin plate described in this embodiment, the process flow of the method: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar cooling , coiling.

[0037] The chemical composition of molten steel after refining is: 0.33wt.%, Si: 0.20wt.%, Mn: 0.50wt.%, P 0.015wt.%, S 0.008wt.%, Cr: 0.90wt.%, Mo: 0.15wt. .%, the rest is Fe and unavoidable impurities;

[0038] Process parameters of thin slab continuous casting and rolling process: slab entering furnace temperature T 入 is 1010°C, the superheat of molten steel T 过 38°C, finishing temperature T 终 900°C, coiling temperature T 卷 600℃, continuous casting casting speed S 拉 5.1m / min, continuous casting liquid core pressure L 压 10mm.

[0039] The physical and chemical performance indicators of the mold flux used in this example: the melting point is 1020°C, ...

Embodiment 3

[0044] The production method of 30CrMo hot-rolled thin plate described in this embodiment, the process flow of the method: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar cooling , coiling.

[0045] The chemical composition of molten steel after refining is: C: 0.31wt.%, Si: 0.30wt.%, Mn: 0.40wt.%, P 0.008wt.%, S 0.012wt.%, Cr: 0.95wt.%, Mo: 0.20wt.%, the rest is Fe and unavoidable impurities;

[0046] Process parameters of thin slab continuous casting and rolling process: slab entering furnace temperature T 入 is 980°C, the superheat of molten steel T 过 36°C, finishing temperature T 终 830°C, coiling temperature T 卷 540°C, casting speed S 拉 is 4.6m / min, the continuous casting liquid core presses L 压 15mm.

[0047] The physical and chemical performance indicators of the mold flux used in this example: the melting point is 990°C, the basicity ...

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Abstract

The invention discloses a method for producing a 30CrMo hot rolled steel plate, which mainly comprises the steps of smelting, refining, thin slab casting, soaking, high pressure water descaling, hot continuous rolling, cooling and reeling based on the process of thin slab casting and rolling. The withdrawing speed of continuous casting is S withdrawing (3.5m/min </= S withdrawing </= 5.5m/min), the charging temperature of casting blanks is T charging (900 DEG C </= T charging </= 1050 DEG C), the final rolling temperature is T final (830 DEG C </= T final </= 930 DEG C), the reeling temperature is T reeling ( 520 DEG C </= T reeling </= 620 DEG C), and the depth of a single-surface decarburized layer is 0.2 to 1.2 percent of the thickness of the steel plate. The chemical constitutes of molten steel after being alloyed in a refining process comprise 0.26-0.34 wt.% of C, 0.17-0.37 wt.% of Si, 0.40-0.70 wt.% of Mn, less than or equal to 0.035 wt.% of P, less than or equal to 0.035 wt.% of S, 0.80-1.10 wt.% of Cr, 0.15-0.25 wt.% of Mo and the balance of Fe and inevitable impurities. The 30CrMo hot rolled steel plate produced in the method has the characteristics of uniform structure property, high thermal stability and high strength, and the quality of the 30CrMo hot-rolled steel plate is obviously improved.

Description

technical field [0001] The invention relates to the technical field of alloy structural steel production, in particular to a method for producing 30CrMo hot-rolled steel plates. Background technique [0002] 30CrMo alloy structural steel has high strength and toughness, good hardenability, and has good comprehensive mechanical properties after quenching and tempering at low temperature and after quenching and high temperature tempering. After quenching and tempering, the steel has higher strength below 550°C. Steel has good low-temperature toughness, no temper brittleness, good weldability and machinability, and is widely used in medium-sized machinery manufacturing, chemical industry, boiler manufacturing, and tool and mold industries. The appropriate combination of Cr and Mo elements in 30CrMo makes the steel have good comprehensive mechanical properties at room temperature and high temperature, and obtains dense structure and high strength without significantly reducing ...

Claims

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Application Information

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IPC IPC(8): B21B1/26C22C38/22
Inventor 毛新平谢利群庄汉洲
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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