Ferritic stainless steel bellows

Bellows made of a ferritic stainless steel consisting essentially of, in terms of wt %:

• C:
• not greater than 0.02%,
• Si:
• from 0.1 to 1.5%,
• Mn:
• not greater than 1.0%,
• Cr:
• from 11.0 to 22.0%,
• Al:
• from 0.01 to 0.08%,
• N:
• not greater than 0.015%,
• balance Fe and unavoidable impurities, and
• at least one of the following components:
• Ti:
• at least four times the sum of the C and N contents and not greater than 0.6%, and
• Nb:
• at least eight times the sum of the C and N contents and not greater 1.0%,
• wherein the crystal grain size measured in a section in a direction orthogonal to a rolling direction is not greater than 8.5 in terms of the grain size number, and the crystal grain size measured in a section orthogonal to a section parallel to the rolling direction is not smaller than 5.0, on average, in terms of the grain size number.

Bellows made of a ferritic stainless steel consisting essentially of, in terms of wt %:

• C:
• not greater than 0.02%,
• Cr:
• from 11.0 to 22.0%,
• Al:
• from 0.01 to 0.08%, and
• N:
• not greater than 0.015%,
• balance Fe and unavoidable impurities, and
• at least one of the following components:
• Mo:
• not greater than 2%,
• Cu:
• not greater than 1.5%, and
• Ni:
• not greater than 1.5%,
• wherein the crystal grain size measured in a section in a direction orthogonal to a rolling direction is not greater than 8.5 in terms of the grain size number, and the crystal grain size measured in a section orthogonal to a section parallel to the rolling direction is not smaller than 5.0, on average, in terms of the grain size number.

Bellows made of a ferritic stainless steel consisting essentially of, in terms of wt %:

• C:
• not greater than 0.02%,
• Cr:
• from 11.0 to 22.0%,
• Al:
• from 0.01 to 0.08%, and
• N:
• not greater than 0.015%, and
• at least one of the following components:
• Ti:
• at least four times the sum of the C and N contents and not greater than 0.6%, and
• Nb:
• at least eight times the sum of the C and N contents and not greater 1.0%, and
• at least one of the following components:
• Mo:
• not greater than 2%,
• Cu:
• not greater than 1.5%, and
• Ni:
• not greater than 1.5%,
• and balance Fe and unavoidable impurities,
• wherein the crystal grain size measured in a section in a direction orthogonal to a rolling direction is not greater than 8.5 in terms of the grain size number, and the crystal grain size measured in a section orthogonal to a section parallel to the rolling direction is not smaller than 5.0, on average, in terms of the grain size number.