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High-toughness austenite boiler steel

A boiler steel and austenitic technology, which is applied in the field of high toughness austenitic boiler steel to manufacture superheater and reheater tubes of ultra-supercritical thermal power units, which can solve the problems of low impact toughness at room temperature and achieve high toughness in composition design , high room temperature impact toughness, and reasonable composition design

Inactive Publication Date: 2012-07-25
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after long-term high-temperature service or long-term aging, the room temperature impact toughness of this steel becomes very low.

Method used

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  • High-toughness austenite boiler steel
  • High-toughness austenite boiler steel
  • High-toughness austenite boiler steel

Examples

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Embodiment Construction

[0028] The present invention is described in more detail with examples below. The examples are only descriptions of the best embodiments of the present invention, and do not limit the scope of the present invention in any way.

[0029] According to the composition range proposed by the present invention, three groups of embodiments are made on the austenitic heat-resistant steel of the present invention. In order to compare with the examples, we used the same method to prepare a group of comparative examples of S31042 steel. The composition of the heat-resistant steel of the embodiment of the present invention and the composition of the heat-resistant steel of the comparative example are listed in Table 1.

[0030] The steel pipes of the examples and the steel pipes of the comparative examples are prepared according to the same process: raw material preparation→EAF+AOD smelting→die casting→slab opening→hot cutting to length→centering→cross rolling and piercing→cold rolled pip...

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Abstract

The invention discloses high-toughness austenite boiler steel belonging to the technical field of austenite boiler steel. The boiler steel comprises the following chemical constituents: 0.025-0.038 wt% of C, 0.20-0.40 wt% of Si, less than or equal to 2.00 wt% of Mn, less than or equal to 0.045 wt% of P, less than 0.03 wt% of S, 20-21.5 wt% of Ni, 0.15-0.20 wt% of N, 0.30-0.40 wt% of Nb, 0.0010-0.050 wt% of element B, 0.020-0.15 wt% of element V and the balance of Fe. The invention has the advantages that when the high-toughness austenite boiler steel is compared with S31042 steel, two alloy elements of B and V are added, and the ingredient range of C, Nb, N, Si, Cr, Ni and other elements is adjusted, so that the high-toughness austenite boiler steel has the characteristics of reasonable constituent design and high toughness. After long aging at 700 DEG C, compared with the S31042 steel subject to same heat treatment, the high-toughness austenite boiler steel has higher room-temperature impact toughness, and tensile strength at high temperature of 700 DEG C is comparative or slightly higher.

Description

technical field [0001] The invention belongs to the technical field of austenitic steel, and in particular relates to a high-toughness austenitic boiler steel, which is suitable for manufacturing superheater and reheater tubes of ultra-supercritical thermal power units. Background technique [0002] Energy conservation and emission reduction is a major issue faced by human beings that has received worldwide attention. Studies have shown that there is a significant positive correlation between the thermal efficiency of traditional power generation boilers and steam turbines and steam temperature and pressure. For example, the thermal efficiency of a generator set with a steam parameter of 593°C / 30MPa is 6% higher than that of a generator set with a steam parameter of 538°C / 18.5MPa. Therefore, people try to improve the thermal efficiency of the power plant and reduce the CO2 through the design of the power plant. 2 emissions. An effective way to improve the thermal efficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54
Inventor 刘正东程世长王敬忠包汉生杨钢干勇
Owner CENT IRON & STEEL RES INST
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