Niobium-titanium-chromium-boron alloyed wear-resistant steel and preparation method thereof

A niobium-titanium-chromium-boron and boron alloying technology, which is applied in the field of steelmaking, can solve the problems of poor thickness accuracy, low yield, and low thickness accuracy, and achieve the effects of reducing manufacturing costs, reducing manganese sulfide inclusions, and good plate shape

Active Publication Date: 2018-09-11
MAGANG (GROUP) HOLDING CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

The wear-resistant steel produced by this type of process has obvious disadvantages. Due to the use of sheet rolling or steckel rolling mill, the thickness accuracy is not hi...

Method used

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  • Niobium-titanium-chromium-boron alloyed wear-resistant steel and preparation method thereof
  • Niobium-titanium-chromium-boron alloyed wear-resistant steel and preparation method thereof
  • Niobium-titanium-chromium-boron alloyed wear-resistant steel and preparation method thereof

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preparation example Construction

[0034] The preparation method of the niobium-titanium-chromium-boron alloy wear-resistant steel is as follows:

[0035] (1) Pretreatment of molten iron: S≤0.002%: front and rear slag removal, the bright side of the rear slag removal is greater than 85%;

[0036] (2) Converter smelting: P ≤ 0.013%, strengthen the operation of tapping slag, the amount of slag ≤ 4kg / t; process control model, the final furnace temperature is 1620 ~ 1635;

[0037] (3) Alloy fine-tuning station;

[0038] (4) LF refining, desulfurization to S≤0.0010%, white slag operation to ensure full reduction of ladle top slag, feeding calcium wire;

[0039] (5) RH refining: before processing this steel type, it is necessary to wash the tank, adjust [Ti], [B], [Al] to the target value; at the same time, fine-tune other components to the target value to ensure that the deep degassing time is not less than 12 minutes, and ensure that the broken The unprecedented [H] content is less than 1.5ppm. Feed the calcium ...

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Abstract

The invention discloses a niobium-titanium-chromium-boron alloyed wear-resistant steel. The niobium-titanium-chromium-boron alloyed wear-resistant steel comprises, by weight, 0.15-0.30% of C, 0.40% orless of Si, 0.60-1.60% of Mn, 0.015% or less of P, 0.0015% of S, 0.010-0.050% of Nb, 0.0025-0.40% of Cr, 0.010-0.040% of Ti, 0.015-0.040% of Als, 0.0025-0.040% of Ni, 0.0010-0.0040% of Cu, 0.0010-0.0050% of Ca, 0.0010-0.0030% of B, 0.006% or less of N, 0.004% or less of O, 0.00020% or less of H, and the balance of iron and inevitable impurities. A preparation method of the niobium-titanium-chromium-boron alloyed wear-resistant steel comprises the following steps: hot metal pretreatment, converter smelting, alloy fine adjustment, LF refining, RH refining, continuous casting, stacking slow cooling, hot rolling, cross cutting and flattening, and heat treatment for obtaining the finished product. The niobium-titanium-chromium-boron alloyed wear-resistant steel is a martensite structure, and has excellent mechanical properties and excellent wear resistance, the Rm value is 1250-1500 MPa, the A50 value is 7-15%, the HBW value is 425-500, the thickness size tolerance is within -0.15 to +0.15mm, and the lowest thickness of a wear-resistant plate produced from the steel can be 2.0 mm.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a niobium-titanium-chromium-boron alloy wear-resistant steel and a preparation method thereof. Background technique [0002] Low-alloy high-strength wear-resistant steel has good machinability and excellent wear resistance. The service life is several times that of traditional structural steel plates. The production process is simple. Generally, it is quenched after being rolled by a stove coil mill or a wide and thick plate mill+ Temper. It is mainly alloyed with Cr and Mo, and the production cost is relatively high. The main thickness is 6-150mm. The wear-resistant steel produced by this type of process has obvious disadvantages. Due to the use of sheet rolling or steckel rolling mill, the thickness accuracy is not high, and the yield is low, especially the wear-resistant steel with a thickness below 6mm cannot be produced, and the thickness accuracy is relati...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/48C22C38/50C22C38/06C22C38/42C22C38/54C22C38/38C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/38C22C38/42C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 王海波胡学文丁波何博闻成才杨永超吴志文彭欢王泉舒宏富
Owner MAGANG (GROUP) HOLDING CO LTD
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