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A chain component which has a simple surface treatment structure and in which satisfactory wear resistance is maintained for a long term; and a chain which employs this chain component so that a satisfactory wear elongation resistance is maintained are provided. A roller chain serving as an industri

A chain component which has a simple surface treatment structure and in which satisfactory wear resistance is maintained for a long term; and a chain which employs this chain component so that a satisfactory wear elongation resistance is maintained are provided. A roller chain serving as an industrial chain for power transmission is constructed such that a pair of outer plates linked by two pins and a pair of inner plates linked together by two bushes onto each of which a roller is fit are alternately linked together in a plurality in a state that each pin is loosely fit in each bush. A chromium nitride layer is formed on the outer side of the steel-based substrate of the pin. The chromium nitride layer contains iron at a content higher than 0 mass % and lower than or equal to 55 mass %.

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1. A chain component of an industrial chain for power transmission, comprising: a steel-based substrate; anda chromium nitride layer formed on an outer side of the steel-based substrate and containing iron at a content greater than or equal to 1 mass % and lower than or equal to 55 mass %. 2. The ch

1. A chain component of an industrial chain for power transmission, comprising: a steel-based substrate; anda chromium nitride layer formed on an outer side of the steel-based substrate and containing iron at a content greater than or equal to 1 mass % and lower than or equal to 55 mass %. 2. The chain component according to claim 1, wherein the iron has a concentration distribution decreasing outward from a surface of the steel-based substrate. 3. The chain component according to claim 2, wherein the chromium and the nitrogen in the chromium nitride layer have a concentration distribution decreasing from the outer side toward the surface of the steel-based substrate. 4. The chain component according to claim 1, wherein within entire contents of 100 mass %, iron is contained at a content greater than or equal to 1 mass % and lower than or equal to 55 mass %, chromium is contained at a content of 45 mass % or higher and 90 mass % or lower, and nitrogen is contained at a content of 5 mass % or higher and 25 mass % or lower. 5. The chain component according to claim 1, wherein the iron content is 1 mass % or higher and 45 mass % or lower. 6. The chain component according to claim 2, wherein the iron content is 1 mass % or higher and 45 mass % or lower. 7. The chain component according to claim 4, wherein the iron content is 1 mass % or higher and 45 mass % or lower. 8. The chain component according to claim 1, wherein the chromium nitride layer has a thickness of 2 μm or greater and 30 μm or smaller. 9. A chain constructed such that a pair of outer plates linked together by two pins and a pair of inner plates linked together by two bushes are alternately linked together in a plurality in a state that each pin is loosely fit in each bush, wherein at least any one of the pin, the bush, the inner plate, and the outer plate is a chain component according to claim 1. 10. A chain constructed such that a pair of outer plates linked together by two pins and a pair of inner plates linked together by two bushes are alternately linked together in a plurality in a state that each pin is loosely fit in each bush, wherein at least any one of the pin, the bush, the inner plate, and the outer plate is a chain component according to claim 2. 11. A chain constructed such that a pair of outer plates linked together by two pins and a pair of inner plates linked together by two bushes are alternately linked together in a plurality in a state that each pin is loosely fit in each bush, wherein at least any one of the pin, the bush, the inner plate, and the outer plate is a chain component according to claim 4. 12. A chain constructed such that a pair of outer plates linked together by two pins and a pair of inner plates linked together by two bushes are alternately linked together in a plurality in a state that each pin is loosely fit in each bush, wherein at least any one of the pin, the bush, the inner plate, and the outer plate is a chain component according to claim 5. 13. A chain constructed such that a pair of outer plates linked together by two pins and a pair of inner plates linked together by two bushes onto each of which a roller is fit are alternately linked together in a plurality in a state that each pin is loosely fit in each bush, wherein at least any one of the pin, the bush, the inner plate, the outer plate, and the roller is a chain component according to claim 1. 14. A chain constructed such that a pair of outer plates linked together by two pins and a pair of inner plates linked together by two bushes onto each of which a roller is fit are alternately linked together in a plurality in a state that each pin is loosely fit in each bush, wherein at least any one of the pin, the bush, the inner plate, the outer plate, and the roller is a chain component according to claim 2. 15. A chain constructed such that a pair of outer plates linked together by two pins and a pair of inner plates linked together by two bushes onto each of which a roller is fit are alternately linked together in a plurality in a state that each pin is loosely fit in each bush, wherein at least any one of the pin, the bush, the inner plate, the outer plate, and the roller is a chain component according to claim 4. 16. A chain constructed such that a pair of outer plates linked together by two pins and a pair of inner plates linked together by two bushes onto each of which a roller is fit are alternately linked together in a plurality in a state that each pin is loosely fit in each bush, wherein at least any one of the pin, the bush, the inner plate, the outer plate, and the roller is a chain component according to claim 5. 17. A chain constructed such that a plurality of inner plates whose one end part in a shorter-side direction is provided with a pair of linkage teeth formed in a W-shape are linked together in a width direction of the chain by pins in a state that one linkage tooth of one inner plate of adjacent inner plates overlaps with the other linkage teeth of the other inner plate and such that an outer plate is arranged on each outer side of the width direction, wherein at least any one of the pin, the inner plate, and the outer plate is a chain component according to claim 1. 18. A chain constructed such that a plurality of inner plates whose one end part in a shorter-side direction is provided with a pair of linkage teeth formed in a W-shape are linked together in a width direction of the chain by pins in a state that one linkage tooth of one inner plate of adjacent inner plates overlaps with the other linkage teeth of the other inner plate and such that an outer plate is arranged on each outer side of the width direction, wherein at least any one of the pin, the inner plate, and the outer plate is a chain component according to claim 2. 19. A chain constructed such that a plurality of inner plates whose one end part in a shorter-side direction is provided with a pair of linkage teeth formed in a W-shape are linked together in a width direction of the chain by pins in a state that one linkage tooth of one inner plate of adjacent inner plates overlaps with the other linkage teeth of the other inner plate and such that an outer plate is arranged on each outer side of the width direction, wherein at least any one of the pin, the inner plate, and the outer plate is a chain component according to claim 4. 20. A chain constructed such that a plurality of inner plates whose one end part in a shorter-side direction is provided with a pair of linkage teeth formed in a W-shape are linked together in a width direction of the chain by pins in a state that one linkage tooth of one inner plate of adjacent inner plates overlaps with the other linkage teeth of the other inner plate and such that an outer plate is arranged on each outer side of the width direction, wherein at least any one of the pin, the inner plate, and the outer plate is a chain component according to claim 5.