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Ferrite heat resistant steel

A ferritic and heat-resistant steel technology, applied in the field of ferritic heat-resistant steel, can solve the problems of insufficient high strength and insufficient resistance to welding cracks.

Active Publication Date: 2010-03-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, not only the high strength of HAZ is not enough, but also there is a problem that sufficient welding crack resistance cannot be obtained at the time of welding.

Method used

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Effect test

Embodiment 1

[0082] 16 kinds of steels having the chemical compositions shown in Table 1 were melted in a vacuum melting furnace, and after forging and rolling, air cooling was performed after holding at 1150°C for 1 hour and air cooling after holding at 770°C for 1.5 hours Tempering heat treatment. In addition, code 13 corresponds to the steel of SUS410J3TB which is a general-purpose steel, and is used as a comparative steel concerning creep strength. Furthermore, a steel plate having a thickness of 12 mm, a width of 50 mm, and a length of 300 mm, and a steel plate having a thickness of 10 mm, a width of 100 to 120 mm, and a length of 300 to 500 mm were produced by machining. A steel plate with a thickness of 12mm is used for longitudinal adjustable restraint crack test to evaluate the liquefaction crack susceptibility of HAZ.

[0083] [Table 1]

[0084]

[0085] Such as figure 1 As shown in the schematic diagram of , the longitudinal adjustable restraint crack test is such a method...

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Abstract

The invention provides a ferrite heat resistant steel excellent in solvent cracking resistance and creep strength in the HAZ.A high-Cr-containing ferrite heat resistant steel, characterized by containing (in terms of percent by mass) Si: not less than 0.1% and 1.0% or less, Mn: 2.0% or less, Co: 1 to 8%, Cr: 7 to 13%, V: 0.05 to 0.4%, Nb: 0.01 to 0.09%, either one of or the total of both of Mo andW: 0.5 to 4%, B: 0.005 to 0.025%, Al: 0.03% or less and N: 0.003 to 0.06%, and further containing C in an amount that satisfies the following formula (1), and Fe and impurities as remainders, whereinas the impurities, O, P and S are contained in an amount of 0.02% or less, 0.03% or less, and 0.02% or less, respectively. 0.005 = C = (-5 / 3) B + 0.085 (1) In the formula, C and B represent the contents (% by mass) of the respective elements. Further, it may contain one element or two or more elements of Nd, Ta, Ca and Mg.

Description

technical field [0001] The present invention relates to a ferritic heat-resistant steel having excellent high-temperature strength and welding crack resistance in a welded heat-affected zone, which is used for components used at high temperatures in thermal power boilers and the like. Background technique [0002] In recent years, thermal power generation has been promoting high-temperature and high-pressure steam conditions in order to improve thermal efficiency, and it is planned to operate under ultra-supercritical pressure conditions of 650°C and 350 atmospheres in the future. Ferritic heat-resistant steel is cheaper than austenitic stainless steel, and has the advantage of being a heat-resistant steel that has a smaller coefficient of thermal expansion, so it is widely used. [0003] Ferritic heat-resistant steels are required to be increased in strength in order to cope with future severe steam conditions. For example, Patent Document 1 and Patent Document 2 propose s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/38
CPCC22C38/06C22C38/26C22C38/02C22C38/30C22C38/005C22C38/04C22C38/22C22C38/001C22C38/24C22C38/32C22C38/38
Inventor 平田弘征吉泽满小川和博五十岚正晃
Owner NIPPON STEEL CORP
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