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High-quality thin-gauge hot-rolled alloy tool steel and CSP production technique thereof

A technology of alloy tool steel and production process, which is applied in the field of alloy tool steel, can solve the problems of low alloy content, etc., and achieve the effects of not being easy to scrap steel, ensuring rolling stability, and avoiding cracks

Active Publication Date: 2016-12-21
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently developed products have less alloy content, mainly concentrated on carbon tool steel, and the thickness is basically above 2.5mm. Therefore, the existing products developed by the thin slab continuous casting and rolling production line are far from meeting the market demand.

Method used

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  • High-quality thin-gauge hot-rolled alloy tool steel and CSP production technique thereof
  • High-quality thin-gauge hot-rolled alloy tool steel and CSP production technique thereof
  • High-quality thin-gauge hot-rolled alloy tool steel and CSP production technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The high-quality thin-gauge hot-rolled alloy tool steel provided in this embodiment has the following components by weight percentage: C: 0.9299%, Si: 1.268%, Mn: 0.4395%, Cr: 1.088%, P: 0.014%, S: 0.0035%, Als: 0.0205%. N 0.0042%, the rest is Fe and unavoidable impurities. The element composition is roughly adjusted in step 1), and fine-tuned in step 2) by refining outside the furnace.

[0033] The CSP production process steps of the alloy tool steel are:

[0034] 1) Smelting is carried out according to the composition of the original steel grade, and the tapped P after smelting is 0.008%.

[0035] 2) After smelting, the molten steel is refined outside the furnace, and then cast into a billet in a CSP continuous casting machine. After the head billet comes out of the drawing and leveling machine, a coal-oxygen gun is used to heat up the shear position on both sides of the head billet, and the pendulum cutting is normal; The thickness of the continuous casting slab is ...

Embodiment 2～5

[0048] The high-quality thin-gauge hot-rolled alloy tool steel provided by Examples 2-5 has the following components by weight percentage: C: 0.9336%, Si: 1.3493%, Mn: 0.4721%, Cr: 1.122%, P: 0.0145% , S: 0.0037%, Als: 0.0209%. N 0.0043%, the rest is Fe and unavoidable impurities. The element composition is roughly adjusted in step 1), and fine-tuned in step 2) by refining outside the furnace.

[0049] Each embodiment uses the same process steps as in embodiment 1), the difference is that the control parameters of the CSP process in each step and the mechanical properties of the obtained product are shown in Table 3.

[0050] Table 3 embodiment 2 process parameters and product mechanical properties

[0051]

[0052]

[0053] The rolling widths of Examples 2 to 5 are all 1100 mm, and the rolling thicknesses are 1.5 mm, 1.8 mm, 2.3 mm, and 2.5 mm in sequence. It can be seen from Tables 2 and 3 that the mechanical properties of the products obtained in each embodiment me...

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Abstract

The invention discloses high-quality thin-gauge hot-rolled alloy tool steel and a CSP production technique thereof. According to the chemical components, the alloy tool steel comprises 0.85-0.95% of C, 1.25-1.45% of Si, 0.4-0.55% of Mn, 1.05-1.15% of Cr, 0.015-0.035% of Als, 0-0.015% of P, 0-0.005% of S, 0-0.006% of N, and the balance Fe and inevitable impurities. The CSP production technique comprises the following steps that (1) converter smelting is conducted; (2) external refining is conducted on molten steel after smelting, then the molten steel is cast into blanks on a CSP continuous casting machine, the shearing positions on the two sides of a first continuous cast blank are roasted with a coal-oxygen burner to increase the temperature, and shear blades of rocking shears are prevented from being damaged; (3) after casting, the plate blank enters a soaking pit to be heated uniformly; (4) the plate blank is discharged out of a furnace, subjected to scale removal with high-pressure water and then subjected to seven passes of finish rolling; (5) coiling is conducted after laminar cooling; and (6) the plate blank is piled and cooled for standby application. The carbon content of the high-quality thin-gauge hot-rolled alloy tool steel is larger than 0.85%, the minimum thickness is 1.5 mm, the product surface quality is good, and mechanical property requirements are met.

Description

technical field [0001] The invention relates to an alloy tool steel, in particular to a high-quality thin gauge hot-rolled alloy tool steel and its CSP production process. Background technique [0002] High-quality alloy tool steel generally has a carbon content of more than 0.50%, and contains more alloying elements such as Si and Cr. It is mainly used in the production of auto parts and precision tools such as automobile leaf springs and brake pads. With the development of domestic high-end equipment and manufacturing industry, the domestic demand for high-carbon alloy tool steel is increasing. At present, the domestic annual demand is about 300,000 to 500,000 tons. Compared with ordinary high-carbon steel, alloy tool steel is more difficult to control due to its higher carbon and alloy content and higher quality requirements. [0003] At present, the production of high-quality alloy tool steel at home and abroad mainly adopts narrow-band process and conventional hot roll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/06C21D8/02B22D11/16
CPCB22D11/163C21D8/0226C22C38/001C22C38/02C22C38/04C22C38/06C22C38/18
Inventor 王成杜秀峰丁茹王春锋郑海涛谭佳梅叶飞李国全甘晓龙汪水泽
Owner 武汉钢铁有限公司