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Ferritic stainless steel and manufacturing process thereof

A manufacturing process, stainless steel technology, applied in the field of ferritic stainless steel and its manufacturing process, can solve the problems of restricting development, poor corrosion resistance, high price, etc., and achieve the effect of reducing costs

Active Publication Date: 2015-11-18
浙江润都能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon steel pipes have poor corrosion resistance and are extremely sensitive to erosion. Compared with carbon steel pipes, stainless steel heat exchange tubes have incomparable advantages in erosion resistance and corrosion resistance, which can prolong the operation of the heat exchanger. However, the high price of austenitic stainless steel tubes used in large quantities in China often discourages power plants, and their materials are also extremely sensitive to stress corrosion, which restricts the use of stainless steel heat exchange tubes in the field of traditional carbon steel tubes such as high-pressure heaters. develop

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  • Ferritic stainless steel and manufacturing process thereof
  • Ferritic stainless steel and manufacturing process thereof
  • Ferritic stainless steel and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A ferritic stainless steel, including Fe element and modifying chemical elements, the weight percentage of each chemical element is shown in Table 1:

[0034] Table 1 Each chemical element and its weight percentage

[0035] the element

mass percentage

C

0.010％

Si

0

mn

0.012％

P

0.025％

S

0.003％

Cr

17.02％

Ni

0.40％

Mo

0.02％

Cu

0.06％

Al

0.020％

Ti

0.35％

N

0.01％

Fe

82.07％

[0036] Wherein the weight percentage of Mo is 0.02%, the weight percentage of Mn obtained by formula (1) is 0.012%, and the weight percentage of Cr obtained by formula (2) is 17.02%.

[0037] According to the formula (3) 0.20%+4(C+N)%≤Ti≤0.50%, in this embodiment, 0.20%+4(C+N)%=0.28%, so Ti in this embodiment is 0.35% Meet the conditions of formula (3).

[0038] The present embodiment contains the mechanical property test result of the ferritic ...

Embodiment 2

[0045] A ferritic stainless steel, including Fe element and modified chemical elements, the weight percentage of each chemical element is shown in Table 3:

[0046] Table 3 each chemical element and its weight percentage

[0047] the element

mass percentage

C

0.020％

Si

0.55％

mn

0.80％

P

0

S

0.006％

Cr

18.75％

Ni

0

Mo

0.05％

[0048] Cu

0.03％

Al

0.040％

Ti

0.50％

N

0.02％

Fe

79.234％

[0049] Wherein the weight percentage of Mo is 0.05%, the weight percentage of Mn obtained by formula (1) is 0.80%, and the weight percentage of Cr obtained by formula (2) is 18.75%.

[0050] According to formula (3) 0.20%+4(C+N)%≤Ti≤0.50%, in this embodiment, 0.20%+4(C+N)%=0.36%, so Ti in this embodiment is 0.50% Meet the conditions of formula (3).

[0051]The present embodiment contains the mechanical performance test result of the...

Embodiment 3

[0056] A ferritic stainless steel, including Fe element and modified chemical elements, the weight percentage of each chemical element is shown in Table 5:

[0057] Table 5 elements and their weight percentages

[0058] the element

mass percentage

C

0

Si

0.35％

mn

0

P

0.02％

S

0.001％

Cr

17.00％

Ni

0.20％

Mo

0

Cu

0.01％

Al

0.010％

Ti

0.26％

N

0.015％

Fe

82.134％

[0059] Wherein the weight percentage of Mo is 0, the weight percentage of Mn is 0 obtained by the formula (1), and the weight percentage of Cr is 17.00% by the formula (2).

[0060] According to formula (3) 0.20%+4(C+N)%≤Ti≤0.50%, in this embodiment, 0.20%+4(C+N)%=0.26%, so Ti in this embodiment is 0.26% Meet the conditions of formula (3).

[0061] The present embodiment contains the mechanical property test result of the ferritic stainless steel of above-mentioned...

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Abstract

The invention discloses ferritic stainless steel and a manufacturing process thereof. The ferritic stainless steel comprises Fe and modified chemical elements. The modified chemical elements comprise, by weight percentage, 0-0.02% of C, 0-0.55% of Si, 0-0.25% of P, 0-0.006% of S, 0-0.40% of Ni, 0-0.06% of Cu, 0-0.04% of Al and 0-0.02% of N and further comprise Cr, MN, Mo and Ti, wherein the mass percentage of Mo is not smaller than 0 and not larger than 0.05. The weight percentages of Cr, Mn and Mo have the following relations: Mo=1.063-1, 0<=Mo<=0.05%, another equation here as shown in the specification, and 0.20%+4(C+N)%<=Ti<=0.50%. The ferritic stainless steel is resistant to corrosion and erosion. According to the manufacturing process, the hardness of the ferritic stainless steel can be adjusted, so that the ferritic stainless steel can be applied to a heat exchanger of a nuclear power station, the situation that the material is monopolized by foreign countries is broken, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of stainless steel manufacturing, in particular to a ferritic stainless steel and a manufacturing process thereof. Background technique [0002] At present, the TP439MSR heat exchange tubes used in the steam-water separation reheaters and feed water heaters of all nuclear power plants in operation and under construction in my country need to be imported from abroad. Since the National Development and Reform Commission requires that the localization ratio of key nuclear power equipment must reach more than 85%, this It is a great opportunity and challenge for the independent development of my country's nuclear power industry. [0003] The steam-water separation reheater, high-pressure heater, low-pressure heater, and condenser are important auxiliary equipment in nuclear power turbogenerator sets. The performance and operational reliability of these equipment will directly affect the overall operation of the g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/06
Inventor 祁同刚
Owner 浙江润都能源科技有限公司
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